MICROCHIP MCP73833, MCP73834 Technical data

MCP73833/4

Stand-Alone Linear Li-Ion / Li-Polymer Charge

Management Controller

Features

• Complete Linear Charge Management Controller

- Integrated Pass Transistor

- Integrated Current Sense

- Integrated Reverse Discharge Protection

• Constant Current / Constant Voltage Operation with Thermal Regulation

• High Accuracy Preset Voltage Regulation:

- 4.2V, 4.35V, 4.4V, or 4.5V, +

0.75%

• Programmable Charge Current: 1A Maximum

• Preconditioning of Deeply Depleted Cells

- Selectable Current Ratio

- Selectable Voltage Threshold

• Automatic End-of-Charge Control

- Selectable Current Threshold

- Selectable Safety Time Period

• Automatic Recharge

- Selectable Voltage Threshold

• Two Charge Status Outputs

• Cell Temperature Monitor

• Low-Dropout Linear Regulator Mode

• Automatic Power-Down when Input Power Removed

• Under Voltage Lockout

• Numerous Selectable Options Available for a Variety of Applications:

- Refer to Section 1.0 “Electrical

Characteristics” for Selectable Options

- Refer to the ”Product Identification

System” for Standard Options

• Available Packages:

- 3mm x 3mm DFN-10

- MSOP-10

Applications

• Lithium-Ion / Lithium-Polymer Battery Chargers

• Personal Data Assistants

• Cellular Telephones

• Digital Cameras

• MP3 Players

• Bluetooth Headsets

• USB Chargers

Description

The MCP73833/4 is a highly advanced linear charge management controller for use in space-limited, cost sensitive applications. The MCP73833/4 is available in a 10-Lead, 3mm x 3mm DFN package or a 10-Lead, MSOP package. Along with its small physical size, the low number of external components required makes the MCP73833/4 ideally suited for portable applications. For applications charging from a USB port, the MCP73833/4 can adhere to all the specifications governing the USB power bus.

The MCP73833/4 employs a constant current/constant voltage charge algorithm with selectable preconditioning and charge termination. The constant voltage regulation is fixed with four available options: 4.20V,

4.35V, 4.40V, or 4.50V, to accomodate new, emerging battery charging requirements. The constant current value is set with one external resistor. The MCP73833/4 limits the charge current based on die temperature during high power or high ambient conditions. This thermal regulation optimizes the charge cycle time while maintaining device reliability.

Several options are available for the preconditioning threshold, preconditioning current value, charge termination value, and automatic recharge threshold. The preconditioning value and charge termination value are set as a ratio, or percentage, of the programmed constant current value. Preconditioning can be set

to 100%. Refer to Section 1.0 “Electrical

Characteristics” for available options and the “Product Indentification System” for standard

options.

The MCP73833/4 is fully specified over the ambient temperature range of -40°C to +85°C.

Package Types

DFN-10

MSOP-10

V

STAT1

STAT2

V

STAT1

STAT2

DD

SS

V

1

DD

V

2

DD

3

4

56

V

SS

110

2

3

4

5

10

9

8

7

9

8

7

6

V

THERM

PG(TE)

PROG

BAT

V

BAT

V

BAT

THERM

PG

(TE)

PROG

MCP73833/4

Typical Application

V

IN

1µF

Functional Block Diagram

V

DD

10 µA

Direction

Control

1A Li-Ion Battery Charger

1,2

V

DD

38

470Ω

4

470Ω

7

STAT1

STAT2

PG

THERM

PROG

470Ω

MCP73833

9,10

V

BAT

6

5

V

SS

1µF

1kΩ

Single

+

Li-Ion

Cell

T

10 kΩ

V

BAT

PROG

V

SS

THERM

175 kΩ

54 kΩ

121 kΩ

1MΩ

6µA

Reference Generator

(1.21V)

V

REF

6µA

50 µA

121 kΩ

G=0.001

+

-

+

-

+

-

+

-

+

-

1kΩ

310 kΩ

72.7 kΩ

6kΩ

157.3 kΩ

SHDN

LDO

UVLO

HTVT470.6kΩ

LTV T

111 kΩ

+

PRECONDITION

+

TERMINATIO N

+

-

CHARG E

Charge Control, Timer, and Status Logic

10 kΩ

470.6 kΩ

48 kΩ

CURRENT LIMIT

+

-

CA

+

-

VA

+

-

STAT1

STAT2

PG (TE)

MCP73833/4

1.0 ELECTRICAL CHARACTERISTICS

*Notice: Stresses above those listed under “Maximum

Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those

Absolute Maximum Ratings

VDD........................................................................7.0V

All Inputs and Outputs w.r.t. V

Maximum Junction Temperature, T

.....-0.3 to (VDD+0.3)V

SS

. Internally Limited

J

indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.

Storage temperature .......................... -65°C to +150°C

ESD protection on all pins:

Human Body Model (HBM)

(1.5 kΩ in Series with 100 pF)............................... ≥ 4kV

Machine Model (MM)

(200 pF, No Series Resistance) ...........................300V

DC CHARACTERISTICS

Electrical Specifications: Unless otherwise specified, all limits apply for VDD= [V

Typical values are at +25°C, V

DD

= [V

(Typ)+1.0V]

REG

Parameters Sym Min Typ Max Units Conditions

Supply Input

Supply Voltage V

Supply Current I

DD

SS

3.75 — 6 V Charging

V

REG

(Typ)

+0.3V

— 6 V Charge Complete, Standby

— 2000 3000 µA Charging

— 150 300 µA Charge Complete

— 100 300 µA Standby (No Battery or PROG

— 50 100 µA Shutdown (V

UVLO Start Threshold V

UVLO Stop Threshold V

UVLO Hysteresis V

START

STOP

HYS

3.4 3.55 3.7 V VDD Low to High

3.3 3.45 3.6 V VDD High to Low

— 100 — mV

Voltage Regulation (Constant Voltage Mode, System Test Mode)

Regulated Output Voltage V

REG

4.168 4.20 4.232 V VDD=[V

4.318 4.35 4.382 V I

4.367 4.40 4.433 V T

4.467 4.50 4.533 V

)

Line Regulation |(ΔV

Load Regulation |ΔV

BAT/VBAT

/ΔV

DD

/ V

BAT

|

BAT

— 0.10 0.30 %/V V

| — 0.10 0.30 % I

Supply Ripple Attenuation PSRR — 58 — dB I

—47— dBI

—25— dBI

Current Regulation (Fast Charge Constant Current Mode)

Fast Charge Current Regulation I

REG

90 100 110 mA PROG = 10 kΩ

900 1000 1100 mA PROG = 1.0 kΩ

Maximum Output Current Limit I

MAX

— 1200 — mA PROG < 833Ω

(Typ)+0.3V] to 6V, TA=-40°C to 85°C.

REG

Floating)

< V

V

< V

DD

OUT

=-5°C to +55°C

A

=[V

DD

I

OUT

V

=[V

DD

OUT

=-5°C to +55°C

T

A

DD

)

STOP

(Typ)+1V]

REG

=10 mA

(Typ)+1V] to 6V

REG

=10 mA

=10 mA to 100 mA

(Typ)+1V]

REG

=10 mA, 10Hz to 1 kHz

=10 mA, 10Hz to 10 kHz

=10 mA, 10Hz to 1 MHz

BAT

, or

MCP73833/4

DC CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise specified, all limits apply for VDD= [V

Typical values are at +25°C, V

Parameters Sym Min Typ Max Units Conditions

Preconditioning Current Regulation (Trickle Charge Constant Current Mode)

Precondition Current Ratio I

Precondition Voltage Threshold

Ratio

Precondition Hysteresis V

Charge Termination

Charge Termination Current Ratio I

Automatic Recharge

Recharge Voltage Threshold Ratio V

Pass Transistor ON-Resistance

ON-Resistance R

Battery Discharge Current

Output Reverse Leakage Current I

Status Indicators - STAT1, STAT2, PG

Sink Current I

Low Output Voltage V

Input Leakage Current I

PROG Input

Charge Impedance Range R

Standy Impedance R

Thermistor Bias

Thermistor Current Source I

Thermistor Comparator

Upper Trip Threshold V

Upper Trip Point Hysteresis V

Lower Trip Threshold V

Lower Trip Point Hysteresis V

System Test (LDO) Mode

Input High Voltage Level V

THERM Input Sink Current I

Bypass Capacitance C

DD

= [V

(Typ)+1.0V]

REG

PREG

V

PTH

TERM

RTH

DISCHARGE

THERM

T1HYS

T2HYS

/ I

/ V

PHYS

/ I

/ V

DSON

SINK

OL

LK

PROG

T1

T2

IH

SINK

BAT

REG

7.5 10 12.5 % PROG = 1.0 kΩ to 10 kΩ

15 20 25 % T

30 40 50 %

— 100 — %

64 66.5 70 % V

69 71.5 75 %

— 100 — mV V

3.75 5 6.25 % PROG = 1.0 kΩ to 10 kΩ

5.6 7.5 9.4 % T

7.5 10 12.5 %

15 20 25 %

— 94.0 — % V

— 96.5 — %

— 300 — mΩ VDD = 3.75V

— 0.15 2 µA PROG Floating

—0.25 2 µAV

—0.15 2 µAVDD < V

— -5.5 -15 µA Charge Complete

—1525mA

—0.4 1 VI

— 0.01 1 µA High Impedance, 6V on pin

1—20kΩ

70 — 200 kΩ Minimum Impedance for

47 50 53 µA 2 kΩ < R

1.20 1.23 1.26 V V

—-50—mV

0.235 0.25 0.265 V V

—50—mV

(VDD-0.1)

—— V

3 6 20 µA Stand-by or system test mode

1——µFI

4.7 — — µF I

(Typ)+0.3V] to 6V, TA=-40°C to 85°C.

REG

=-5°C to +55°C

A

Low to High

BAT

High to Low

BAT

=-5°C to +55°C

A

High to Low

BAT

= 105°C

T

J

< V

DD

BAT

STOP

= 4 mA

SINK

Standby

THERM

Low to High

THERM

High to Low

THERM

< 250 mA

OUT

> 250 mA

OUT

< 50 kΩ

DC CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise specified, all limits apply for VDD= [V

Typical values are at +25°C, V

DD

= [V

(Typ)+1.0V]

REG

Parameters Sym Min Typ Max Units Conditions

Automatic Power Down

Automatic Power Down Entry Threshold

Automatic Power Down Exit Thresh-

old

Timer Enable Input (TE

)

V

PDEXIT

Input High Voltage Level V

Input Low Voltage Level V

Input Leakage Current I

V

PD

—V

IH

IL

LK

2.0 — — V

——0.6 V

—0.01 1 µAV

+

BAT

50 mV

+

BAT

150 mV

Thermal Shutdown

Die Temperature T

Die Temperature Hysteresis T

SD

SDHYS

— 150 — °C

—10— °C

AC CHARACTERISTICS

Electrical Specifications: Unless otherwise specified, all limits apply for VDD= [V

Typical values are at +25°C, V

Parameters Sym Min Typ Max Units Conditions

UVLO Start Delay t

Current Regulation

Transition Time Out of Preconditioning t

Current Rise Time Out of Preconditioning t

Preconditioning Comparator Filter Time t

Termination Comparator Filter Time t

Comparator Filter Time t

Charge

Thermistor Comparator Filter Time t

Elapsed Timer

Elapsed Timer Period t

Status Indicators

Status Output turn-off t

Status Output turn-on t

DD

= [V

(Typ)+1.0V]

REG

START

DELAY

RISE

PRECON

TERM

CHARGE

THERM

ELAPSED

OFF

ON

—— 5 msV

—— 1 msV

—— 1 msI

0.4 1.3 3.2 ms Average V

0.4 1.3 3.2 ms Average I

0.4 1.3 3.2 ms Average V

0.4 1.3 3.2 ms Average THERM Rise/Fall

0 0 0 Hours Timer Disabled

3.6 4.0 4.4 Hours

5.4 6.0 6.6 Hours

7.2 8.0 8.8 Hours

— — 200 µs I

MCP73833/4

(Typ)+0.3V] to 6V, TA=-40°C to 85°C.

REG

— V 2.3V < V

VDD Falling

— V 2.3V < V

VDD Rising

(Typ)+0.3V] to 6V, TA=-40°C to 85°C.

REG

BAT

= 6V

TE

Low to High

DD

BAT<VPTH

Rising to 90% of I

OUT

= 1 mA to 0 mA

SINK

= 0 mA to 1 mA

SINK

< V

to V

BAT

OUT

BAT

REG

BAT>VPTH

REG

Rise/Fall

Falling

TEMPERATURE SPECIFICATIONS

Electrical Specifications: Unless otherwise specified, all limits apply for V

Typical values are at +25°C, V

DD

= [V

(Typ)+1.0V]

REG

Parameters Symbol Min Typ Max Units Conditions

Temperature Ranges

Specified Temperature Range T

Operating Temperature Range T

Storage Temperature Range T

A

-40 — +85 °C

-40 — +125 °C

-65 — +150 °C

Thermal Package Resistances

Thermal Resistance, MSOP-10 θ

Thermal Resistance, 3mm x 3mm DFN-10 θ

JA

— 113 — °C/W 4-Layer JC51-7 Standard

— 41 — °C/W 4-Layer JC51-7 Standard

DD

= [V

REG

(Typ)+0.3V] to 6V.

Board, Natural Convection

MCP73833/4

P

:

2.0 TYPICAL PERFORMANCE CURVES

Note: The graphs and tables provided following this note are a statistical summary based on a limited number of

samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range.

Note: Unless otherwise indicated, VDD = 5.2V, V

REG

= 4.20V, I

= 10 mA and TA= +25°C, Constant-voltage mode.

OUT

4.210

4.205

4.200

4.195

4.190

(V)

4.185

4.180

4.175

Battery Regulation Voltage

4.170

4.50 4.75 5.00 5.25 5.50 5.75 6.00

Supply Voltage (V)

MCP73833

I

= 10 mA

OUT

I

= 100 mA

OUT

I

= 500 mA

OUT

I

= 900 mA

OUT

FIGURE 2-1: Battery Regulation Voltage (V

) vs. Supply Voltage (VDD).

BAT

4.220

MCP73833

4.210

4.200

4.190

4.180

I

= 500 mA

4.170

4.160

Battery Regulation Voltage (V)

OUT

I

= 900 mA

OUT

-40

-30

0

-20

-10

Ambient Temperature (°C)

10203040506070

I

OUT

I

OUT

= 10 mA

= 100 mA

80

1000

100

Charge Current (mA)

10

1 3 5 7 9 11 13 15 17 19 21

Programming Resistor (k:)

FIGURE 2-4: Charge Current (I Programming Resistor (R

104

103

102

101

100

99

98

Charge Current (mA)

97

96

4.50 4.75 5.00 5.25 5.50 5.75 6.00

Supply Voltage (V)

PROG

).

R

PROG

OUT

= 10 k

) vs.

FIGURE 2-2: Battery Regulation Voltage

) vs. Ambient Temperature (TA).

(V

BAT

0.40

A)

0.35

+85°C

0.30

-40°C

0.25

0.20

+25°C

0.15

0.10

0.05

Output Leakage Current (

0.00

3.00 3.20 3.40 3.60 3.80 4.00 4.20

Battery Regulation Voltage (V)

FIGURE 2-3: Output Leakage Current (I

DISCHARGE

(V

BAT

) vs. Battery Regulation Voltage

).

FIGURE 2-5: Charge Current (I Supply Voltage (V

1004

1002

1000

998

996

994

992

990

Charge Current (mA)

988

986

4.50 4.75 5.00 5.25 5.50 5.75 6.00

).

DD

Supply Voltage (V)

FIGURE 2-6: Charge Current (I Supply Voltage (V

DD

).

) vs.

OUT

R

= 1 k

PROG

) vs.

OUT

TYPICAL PERFORMANCE CURVES (Continued)

:

P

MCP73833/4

Note: Unless otherwise indicated, VDD = 5.2V, V

120

100

80

60

40

20

Charge Current (mA)

0

25354555657585

Junction Temperature (°C)

FIGURE 2-7: Charge Current (I Junction Temperature (T

1200

1000

800

600

400

200

Charge Current (mA)

0

25354555657585

Junction Temperature (°C)

).

J

R

= 10 k

PROG

95

105

115

125

135

) vs.

OUT

R

= 1 k

PROG

95

105

115

125

135

REG

145

= 4.20V, I

155

= 10 mA and TA= +25°C, Constant-voltage mode.

OUT

52.0

51.5

51.0

50.5

50.0

49.5

49.0

48.5

48.0

Thermistor Bias Current (µA)

-40

-30

0

-20

Ambient Temperature (°C)

10203040506070

-10

FIGURE 2-10: Thermistor Bias Current (I

THRERM

) vs. Ambient Temperature (TA).

0

VAC = 100 mVp-p

= 10 mA

I

OUT

-10

= 4.7 µF, X7R

C

OUT

-20

Ceramic

-30

-40

-50

Attenuation (dB)

-60

-70

0.01 0.1 1 10 100 1000

Frequency (kHz)

80

FIGURE 2-8: Charge Current (I Junction Temperature (T

52.0

A)

51.5

51.0

50.5

50.0

49.5

49.0

48.5

Thermistor Bias Current (

48.0

4.50 4.75 5.00 5.25 5.50 5.75 6.00

).

J

Supply Voltage (V)

FIGURE 2-9: Thermistor Bias Current (I

THRERM

) vs. Supply Voltage (VDD).

OUT

) vs.

FIGURE 2-11: Power Supply Ripple Rejection (PSRR).

0

VAC = 100 mVp-p

= 100 mA

I

OUT

-10

= 4.7 µF, X7R

C

OUT

Ceramic

-20

-30

-40

Attenuation (dB)

-50

-60

0.01 0.1 1 10 100 1000

Frequency (kHz)

FIGURE 2-12: Power Supply Ripple Rejection (PSRR).

MCP73833/4

:

TYPICAL PERFORMANCE CURVES (Continued)

Note: Unless otherwise indicated, VDD = 5.2V, V

14

12

10

8

6

4

I

2

Source Voltage (V)

0

-2 0

204060

Time (µs)

= 10 mA

OUT

= 4.7 µF, X7R

C

OUT

Ceramic

80

100

120

140

160

180

REG

0.10

0.05

0.00

-0.05

-0.10

-0.15

-0.20

-0.25

-0.30

200

FIGURE 2-13: Line Transient Response.

14

12

10

8

6

4

2

Source Voltage (V)

0

-2 0

204060

80

100

Time (µs)

I

= 100 mA

OUT

= 4.7 µF, X7R

C

OUT

Ceramic

120

140

160

0.10

0.05

0.00

-0.05

-0.10

-0.15

-0.20

-0.25

-0.30

180

200

= 4.20V, I

Output Ripple (V)

= 10 mA and TA= +25°C, Constant-voltage mode.

OUT

Output Current (A)

1.40

1.20

1.00

0.80

0.60

0.40

0.20

0.00

-0.20 0

C Ceramic

204060

= 4.7 µF, X7R

OUT

80

Time (µs)

100

120

140

0.10

0.05

0.00

-0.05

-0.10

-0.15

-0.20

-0.25

-0.30

160

180

200

FIGURE 2-16: Load Transient Response.

5.0

4.0

3.0

2.0

MCP73833-FCI/MF

1.0

Battery Voltage (V)

V

= 5.2V

DD

R

= 10.0 k

PROG

0.0 0

30

60

90

Time (Minutes)

120

150

180

200

160

120

80

40

0

210

Output Ripple (V)

Charge Current (A)

FIGURE 2-14: Line Transient Response.

Output Current (A)

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.00

-0.05 0

204060

C

= 4.7 µF, X7R

OUT

Ceramic

80

Time (µs)

100

120

140

0.04

0.02

0.00

-0.02

-0.04

-0.06

-0.08

-0.10

-0.12

160

180

200

FIGURE 2-15: Load Transient Response.

Output Ripple (V)

FIGURE 2-17: Complete Charge Cycle (180 mA Li-Ion Battery).

5.0

4.0

3.0

2.0

Battery Voltage (V)

1.0

0.0 0246810

Time (Minutes)

MCP73833-FCI/MF

V

DD

R

= 10.0 k

PROG

= 5.2V

200

160

120

80

40

0

FIGURE 2-18: Charge Cycle Start Preconditioning (180 mAh Li-Ion Battery).

Charge Current (A)

3.0 PIN DESCRIPTIONS

Descriptions of the pins are listed in Table 3-1.

TABLE 3-1: PIN FUNCTION TABLE

MCP73833/4

Pin No.

DFN MSOP

11 V

22 V

3 3 STAT1 Charge Status Output

4 4 STAT2 Charge Status Output

55 V

6 6 PROG Current Regulation Set and Charge Control Enable

77 PG,

8 8 THERM Thermistor input

99 V

10 10 V

3.1 Battery Management Input Supply )

(V

DD

A supply voltage of [V recommended. Bypass to VSS with a minimum of 1 µF.

3.2 Charge Status Outputs (STAT1,

STAT2)

STAT1 and STAT2 are open-drain logic outputs for connection to a LED for charge status indication. Alternatively, a pull-up resistor can be applied for interfacing to a host microcontroller.

3.3 Battery Management 0V Reference

)

(V

SS

Connect to negative terminal of battery and input supply.

Symbol Function

DD

SS

TE MCP73833: Power Good output, MCP73834: Timer Enable input

BAT

Battery Management Input Supply

Battery Management 0V Reference

Battery Charge Control Output

3.6 Timer Enable Input (TE)

(typ.) + 0.3V] to 6V is

REG

The timer enable (TE) input option is used to enable or disable the internal timer. A low signal on this pin enables the internal timer and a high signal disables the internal timer. The TE the timer when the charger is supplying current to charge the battery and power the system load. The TE input is compatible with 1.8V logic.

3.7 Thermistor Input (THERM)

An internal 50 µA current source provides the bias for most common 10 kΩ negative-temperature coefficient thermistors (NTC). The MCP73833/4 compares the voltage at the THERM pin to factory set thersholds of

1.20V and 0.25V, typically.

MCP73834 Only

3.8 Battery Charge Control Output

3.4 Current Regulation Set (PROG)

Preconditioning, fast charge, and termination currents are scaled by placing a resistor from PROG to V

The charge management controller can be disabled by allowing the PROG input to float.

SS

.

Connect to positive terminal of battery. Drain terminal of internal P-channel MOSFET pass transistor. Bypass to VSS with a minimum of 1 µF to ensure loop stability when the battery is disconnected.

(V

BAT

input can be used to disable

)

3.5 Power Good Indication (PG)

MCP73833 Only

The power good (PG) option is a pseudo open-drain output. The PG current. However, there is a diode path back to the input, and, as such, the PG pulled up to the input. The PG the input to the MCP73833 is above the UVLO threshold and greater than the battery voltage.

output can sink current, but not source

output should only be

output is low whenever

MCP73833/4

4.0 FUNCTIONAL DESCRIPTION

The MCP73833/4 is a highly advanced linear charge management controller. Refer to the functional block diagram and Figure 4-1 that depicts the operational flow algorithm from charge initiation to completion and automatic recharge.

SYSTEM TEST (LDO) MODE

V

> (VDD - 100 mv)

THERM

PROG > 20 kΩ

STAT1 = LOW STAT2 = LOW

PG = LOW

Timer Suspended

TEMPERATURE FAULT

No Charge Current

STAT1 = Hi-Z STAT2 = Hi-Z

PG = LOW

Timer Suspended

SHUTDOWN MODE *

< V

V

DD

UVLO

VDD < V

BAT

STAT1 = HI-Z STAT2 = HI-Z

PG = HI-Z

STANDBY MODE *

(V

V

BAT

PRECONDITIONING MODE

Charge Current (I

FAST CHARGE MODE

Charge Current (I

+ 100 mv)

REG

PROG > 200 kΩ

STAT1 = HI-Z STAT2 = HI-Z

PG = LOW

V

BAT

STAT1 = LOW

STAT2 = Hi-Z

PG = LOW

Timer Reset

V

BAT

STAT1 = LOW STAT2 = Hi-Z

PG = LOW

Timer Enabled

< V

PREG

> V

REG

PTH

* Continuously Monitored

V

> V

BAT

PTH

Timer Expired

V

< V

BAT

RTH

TIMER FAULT

No Charge Current

STAT1 = Hi-Z STAT2 = Hi-Z

PG = LOW

Timer Suspended

V

= V

BAT

REG

CONSTANT VOLTAGE MODE

Charge Voltage (V

STAT1 = LOW

STAT2 = Hi-Z

PG = LOW

CHARGE COMPLETE MODE

No Charge Current

STAT1 = HI-Z

STAT2 = LOW

PG = LOW

Timer Reset

REG

V

< I

BAT

TERM

Timer Expired

FIGURE 4-1: Flow Chart.

MCP73833/4

4.1 Under Voltage Lockout (UVLO)

An internal under voltage lockout (UVLO) circuit monitors the input voltage and keeps the charger in shutdown mode until the input supply rises above the UVLO threshold. The UVLO circuitry has a built in hysteresis of 100 mV.

In the event a battery is present when the input power is applied, the input supply must rise +150 mV above the battery voltage before the MCP73833/4 becomes operational.

The UVLO circuit places the device in shutdown mode if the input supply falls to within +50 mV of the battery voltage.

The UVLO circuit is always active. At any time the input supply is below the UVLO threshold or within +50 mV of the voltage at the V placed in a shutdown mode.

During any UVLO condition, the battery reverse discharge current shall be less than 2 µA.

pin, the MCP73833/4 is

BAT

4.2 Charge Qualification

For a charge cycle to begin, all UVLO conditions must be met and a battery or output load must be present.

A charge current programming resistor must be connected from PROG to V or floating, the MCP73833/4 is disabled and the battery reverse discharge current is less than 2 µA. In this manner, the PROG pin acts as a charge enable and can be used as a manual shutdown.

If the input supply voltage is above the UVLO threshold, but below V MCP73833/4 will pulse the STAT1 and PG outputs as the device determines if a battery is present.

. If the PROG pin is open

SS

(Typ)+0.3V, the

REG

4.4 Constant Current - Fast Charge Mode

During the constant current mode, the programmed charge current is supplied to the battery or load. The charge current is established using a single resistor from PROG to V charge current are calculated using Equation 4-1:

. The program resistor and the

SS

EQUATION 4-1:

1000V

REG

---------------- -= R

PROG

REG

.

Where:

R

PROG

I

REG

Constant current mode is maintained until the voltage at the V

When constant current mode is invoked, the internal timer is reset.

4.4.1 TIMER EXPIRED DURING CONSTANT

If the internal timer expires before the recharge voltage threshold is reached, a timer fault is indicated and the charge cycle terminates. The MCP73833/4 remains in this condition until the battery is removed, the input power is removed, or the PROG pin is opened. If the battery is removed or the PROG pin is opened, the MCP73833/4 enters the Standby mode where it remains until a battery is reinserted or the PROG pin is reconnected. If the input power is removed, the MCP73833/4 is in Shutdown. When the input power is reapplied, a normal start-up sequence ensues.

pin reaches the regulation voltage, V

BAT

CURRENT - FAST CHARGE MODE

I

= kilo-ohms

= milliampere

4.5 Constant Voltage Mode

4.3 Preconditioning

If the voltage at the V preconditioning threshold, the MCP73833/4 enters a preconditioning or trickle charge mode. The preconditioning threshold is factory set. Refer to Section 1.0 “Electrical Characteristics” for preconditioning threshold options.

In this mode, the MCP73833/4 supplies a percentage of the charge current (established with the value of the resistor connected to the PROG pin) to the battery. The percentage or ratio of the current is factory set. Refer to Section 1.0 “Electrical Characteristics” for preconditioning current options.

When the voltage at the V conditioning threshold, the MCP73833/4 enters the constant current or fast charge mode.

pin is less than the

BAT

pin rises above the pre-

BAT

When the voltage at the V regulation voltage, V begins. The regulation voltage is factory set to 4.20V,

4.35V, 4.40V, or 4.50V with a tolerance of ± 0.75%.

, constant voltage regulation

REG

4.6 Charge Termination

The charge cycle is terminated when, during constant voltage mode, the average charge current diminishes below a percentage of the programmed charge current (established with the value of the resistor connected to the PROG pin) or the internal timer has expired. A 1 ms filter time on the termination comparator ensures that transient load conditions do not result in premature charge cycle termination. The percentage or ratio of the current is factory set. The timer period is factory set and can be disabled. Refer to Section 1.0 “Electrical Characteristics” for charge termination current ratio and timer period options.

The charge current is latched off and the MCP73833/4 enters a charge complete mode.

pin reaches the

BAT

MCP73833/4

4.7 Automatic Recharge

The MCP73833/4 continuously monitors the voltage at the V

pin in the charge complete mode. If the

BAT

voltage drops below the recharge threshold, another charge cycle begins and current is once again supplied to the battery or load. The recharge threshold is factory set. Refer to Section 1.0 “Electrical Characteristics” for recharge threshold options.

4.8 Thermal Regulation

The MCP73833/4 limits the charge current based on the die temperature. The thermal regulation optimizes the charge cycle time while maintaining device reliability. Figure 4-2 depicts the thermal regulation for the MCP73833/4.

1200

1000

800

600

400

200

Charge Current (mA)

0

25354555657585

Junction Temperature (°C)

R

= 1 k

Ω

PROG

95

105

115

125

135

145

155

4.9 Thermal Shutdown

The MCP73833/4 suspends charge if the die temperature exceeds +150°C. Charging will resume when the die temperature has cooled by approximately +10°C. The thermal shutdown is a secondary safety feature in the event that there is a failure within the thermal regulation circuitry.

FIGURE 4-2: Thermal Regulation.

MCP73833/4

5.0 DETAILED DESCRIPTION

5.1 Analog Circuitry

5.1.1 BATTERY MANAGEMENT INPUT SUPPLY (V

The VDD input is the input supply to the MCP73833/4. The MCP73833/4 automatically enters a Power-down mode if the voltage on the VDD input falls below the UVLO voltage (V the battery pack when the VDD supply is not present.

STOP

5.1.2 CURRENT REGULATION SET (PROG)

Fast charge current regulation can be scaled by placing a programming resistor (R

. The program resistor and the charge current

to V

SS

are calculated using the Equation 5-1:

EQUATION 5-1:

Where:

R

PROG

I

REG

The preconditioning trickle-charge current and the charge termination current are ratiometric to the fast charge current based on the selected device options.

I

= kilo-ohms

= milliampere

5.1.3 BATTERY CHARGE CONTROL OUTPUT (V

The battery charge control output is the drain terminal of an internal P-channel MOSFET. The MCP73833/4 provides constant current and voltage regulation to the battery pack by controlling this MOSFET in the linear region. The battery charge control output should be connected to the positive terminal of the battery pack.

5.1.4 TEMPERATURE QUALIFICATION (THERM)

The MCP73833/4 continuously monitors battery temperature during a charge cycle by measuring the voltage between the THERM and V 50 µA current source provides the bias for most common 10 kΩ negative-temperature coefficient (NTC) or positive-temperature coefficient (PTC) thermistors.The current source is controlled, avoiding measurement sensitivity to fluctuations in the supply voltage (V at the THERM pin to factory set thersholds of 1.20V and 0.25V, typically. Once a volage outside the thresholds is detected during a charge cycle, the MCP73833/4 immediately suspends the charge cycle. The MCP73833/4 suspends charge by turning off the

). The MCP73833/4 compares the voltage

DD

)

DD

). This feature prevents draining

) from the PROG input

PROG

1000V

---------------- -=

REG

R

PROG

)

BAT

pins. An internal

SS

pass transistor and holding the timer value. The charge cycle resumes when the voltage at the THERM pin returns to the normal range.

If temperature monitoring is not required, place a standard 10 kΩ resistor from THERM to V

SS

5.1.4.1 System Test (LDO) Mode

The MCP73833/4 can be placed in a system test mode. In this mode, the MCP73833/4 operates as a low dropout linear regulator (LDO). The output voltage is regulated to the factory set voltage regulation option. The available output current is limitted to the programmed fast charge current. For stability, the V output must be bypassed to VSS with a minimum capacitance of 1 µF for output currents up to 250 mA. A minimum capacitance of 4.7 µF is required for output currents above 250 mA.

The system test mode is entered by driving the THERM input greater than (V connected to the output. In this mode, the MCP73833/4 can be used to power the system without a battery present.

Note 1: I

THERM

stand-by, and system test modes.

2: A pull-down current source on the

THERM input is active only in stand-by and system test modes.

3: During system test mode, the PROG

input sets the available output current limit.

4: System test mode shall be exited by

releasing the THERM input or cycling input power.

-100 mV) with no battery

DD

is disabled during shutdown,

BAT

5.2 Digital Circuitry

5.2.1 STATUS INDICATORS AND POWER GOOD (PG

The charge status outputs have two different states: Low (L), and High Impedance (Hi-Z). The charge status outputs can be used to illuminate LEDs. Optionally, the charge status outputs can be used as an interface to a host microcontroller. Table 5-1 summarize the state of the status outputs during a charge cycle.

TABLE 5-1: STATUS OUTPUTS

CHARGE CYCLE STATE STAT1 STAT2 PG

Shutdown Hi-Z Hi-Z Hi-Z

Standby Hi-Z Hi-Z L

Charge in Progress L Hi-Z L

Charge Complete (EOC) Hi-Z L L

Temperature Fault Hi-Z Hi-Z L

Timer Fault Hi-Z Hi-Z L

System Test Mode L L L

- OPTION)

MCP73833/4

5.2.2 POWER GOOD (PG) OPTION

The power good (PG) option is a pseudo open-drain output. The PG current. However, there is a diode path back to the input, and as such, the PG output should only be pulled up to the input. The PG input to the MCP73833 is above the UVLO threshold and greater than the battery voltage. If the supply voltage is above the UVLO, but below V the MCP73833 will pulse the PG output as the device determines if a battery is present.

output can sink current, but not source

output is low whenever the

(Typ)+0.3V,

REG

5.2.3 TIMER ENABLE (TE) OPTION

The timer enable (TE) input option is used to enable or disable the internal timer. A low signal on this pin enables the internal timer and a high signal disables the internal timer. The TE the timer when the charger is supplying current to charge the battery and power the system load. The TE input is compatible with 1.8V logic.

input can be used to disable

5.2.4 DEVICE DISABLE (PROG)

The current regulation set input pin (PROG) can be used to terminate a charge at any time during the charge cycle, as well as to initiate a charge cycle or initiate a recharge cycle.

Placing a programming resistor from the PROG input to

enables the device. Allowing the PROG input to

V

SS

float or by applying a logic-high input signal, disables the device and terminates a charge cycle. When disabled, the device’s supply current is reduced to 100 µA, typically.

6.0 APPLICATIONS

:

The MCP73833/4 is designed to operate in conjunction with a host microcontroller or in stand-alone applications. The MCP73833/4 provides the preferred charge algorithm for Lithium-Ion and Lithium-Polymer cells

C

IN

LED

Regulated Wall Cube

FIGURE 6-1: Typical Application Circuit.

LED LED

Constant-current followed by Constant-voltage.

Figure 6-1 depicts a typical stand-alone application

circuit, while Figures 6-2 and 6-3 depict the accompanying charge profile.

Li-Ion Battery Charger

1,2

V

DD

38

STAT1

STAT2

PG

THERM

PROG

R

LED

4

R

LED

7

R

LED

MCP73833

9,10

V

BAT

6

5

V

SS

MCP73833/4

+

Single Li-Ion

-

Cell

10 kΩT

R

C

T1

R

OUT

PROG

R

T2

5.0

4.0

3.0

2.0

MCP73833-FCI/MF

1.0

Battery Voltage (V)

V

= 5.2V

DD

R

= 1.00 k

PROG

0.0 0

20

40

60

Time (Minutes)

80

100

120

140

2.00

1.60

1.20

0.80

0.40

Charge Current (A)

0.00

160

FIGURE 6-2: Typical Charge Profile with Thermal Regulation (1700 mAh Li-Ion Battery).

5.0

4.0

3.0

2.0

Battery Voltage (V)

1.0

0.0 0

2

MCP73833-FCI/MF

4

6

Time (Minutes)

V

DD

R

= 1.00 k

PROG

= 5.2V

8

2.00

1.60

1.20

0.80

Charge Current (A)

0.40

0.00

10

6.1 Application Circuit Design

Due to the low efficiency of linear charging, the most important factors are thermal design and cost, which are a direct function of the input voltage, output current and thermal impedance between the battery charger and the ambient cooling air. The worst-case situation is when the device has transitioned from the Preconditioning mode to the Constant-current mode. In this situation, the battery charger has to dissipate the maximum power. A trade-off must be made between the charge current, cost and thermal requirements of the charger.

6.1.1 COMPONENT SELECTION

Selection of the external components in Figure 6-1 is crucial to the integrity and reliability of the charging system. The following discussion is intended as a guide for the component selection process.

6.1.1.1 Current Programming Resistor (R

The preferred fast charge current for Lithium-Ion cells is at the 1C rate, with an absolute maximum current at the 2C rate. For example, a 500 mAh battery pack has a preferred fast charge current of 500 mA. Charging at this rate provides the shortest charge cycle times without degradation to the battery pack performance or life.

PROG

)

FIGURE 6-3: Typical Charge Cycle Start with Thermal Regulation (1700 mAh Li-Ion Battery).

MCP73833/4

6.1.1.2 Thermal Considerations

The worst-case power dissipation in the battery charger occurs when the input voltage is at the maximum and the device has transitioned from the Preconditioning mode to the Constant-current mode. In this case, the power dissipation is:

PowerDissipation V

–()I

DDMAXVPTHMIN

×=

REGMAX

Where:

V

DDMAX

I

REGMAX

V

PTHMIN

= the maximum input voltage

= the maximum fast charge current

= the minimum transition threshold

voltage

Power dissipation with a 5V, ±10% input voltage source is:

PowerDissipation 5.5V 2.7 V–()550mA× 1.54W==

This power dissipation with the battery charger in the MSOP-10 package will cause thermal regulation to be entered as depicted in Figure 6-3. Alternatively, the 3 mm x 3 mm DFN package could be utilized to reduce charge cycle times.

6.1.1.3 External Capacitors

The MCP73833/4 is stable with or without a battery load. In order to maintain good AC stability in the Constant-voltage mode, a minimum capacitance of 4.7 µF is recommended to bypass the V

pin to VSS. This

BAT

capacitance provides compensation when there is no battery load. In addition, the battery and interconnections appear inductive at high frequencies. These elements are in the control feedback loop during Constant-voltage mode. Therefore, the bypass capacitance may be necessary to compensate for the inductive nature of the battery pack.

Virtually any good quality output filter capacitor can be used, independent of the capacitor’s minimum Effective Series Resistance (ESR) value. The actual value of the capacitor (and its associated ESR) depends on the output load current. A 4.7 µF ceramic, tantalum or aluminum electrolytic capacitor at the output is usually sufficient to ensure stability for output currents up to a 500 mA.

6.1.1.4 Reverse-Blocking Protection

The MCP73833/4 provides protection from a faulted or shorted input. Without the protection, a faulted or shorted input would discharge the battery pack through the body diode of the internal pass transistor.

6.1.1.5 Charge Inhibit

The current regulation set input pin (PROG) can be used to terminate a charge at any time during the charge cycle, as well as to initiate a charge cycle or initiate a recharge cycle.

Placing a programming resistor from the PROG input to

enables the device. Allowing the PROG input to

V

SS

float or by applying a logic-high input signal, disables the device and terminates a charge cycle. When disabled, the device’s supply current is reduced to 100 µA, typically.

6.1.1.6 Temperature Monitoring

The charge temperature window can be set by placing fixed value resistors in series-parallel with a thermistor. The resistance values of R

and RT2 can be

T1

calculated with the following equations in order to set the temperature window of interest.

For NTC thermistors:

RT2R

×

COLD

24k

Ω

5k Ω R

R

T1

---------------------------------+= RT2R

+

RT2R

×

-----------------------------+=

R

+

T2RHOT

COLD

HOT

Where:

R

is the fixed series resistance

T1

is the fixed parallel resistance

R

T2

is the thermistor resistance at the

R

COLD

lower temperature of interest

is the thermistor resistance at the upper

R

HOT

temperature of interest.

For example, by utilizing a 10 kΩ at 25C NTC thermistor with a sensitivity index, β, of 3892, the charge temperature range can be set to 0C - 50C by placing a 1.54 kΩ resistor in series (R

), and a

T1

69.8 kΩ resistor in parallel (RT2) with the thermistor as depicted in Figure 6-1.

6.1.1.7 Charge Status Interface

A status output provides information on the state of charge. The output can be used to illuminate external LEDs or interface to a host microcontroller. Refer to

Table 5-1 for a summary of the state of the status

output during a charge cycle.

6.2 PCB Layout Issues

For optimum voltage regulation, place the battery pack as close as possible to the device’s V recommended to minimize voltage drops along the high current-carrying PCB traces.

If the PCB layout is used as a heatsink, adding many vias in the heatsink pad can help conduct more heat to the backplane of the PCB, thus reducing the maximum junction temperature. Figures 6-4 and 6-5 depict a typical layout with PCB heatsinking.

MCP73833

V

SS

C

IN

V

DD

STAT1

STAT2

R

PROG

and VSS pins,

BAT

C

V

THERM

PG

OUT

BAT

MCP73833/4

FIGURE 6-4: Typical Layout (Top).

V

SS

V

DD

V

BAT

FIGURE 6-5: Typical Layout (Bottom).

MCP73833/4

7.0 PACKAGING INFORMATION

7.1 Package Marking Information

10-Lead DFN

1

XXXX

2

XYWW

3

NNN

4

56

10

9

8

7

10-Lead MSOP

XXXXXX

YWWNNN

Part Number *

Marking

Code

Part Number *

Marking

Code

MCP73833-AMI/MF AAAA MCP73833-BZI/MF AAAB MCP73833-FCI/MF AAAC MCP73834-FCI/MF BAAC MCP73833-GPI/MF AAAD MCP73834-GPI/MF BAAD MCP73833-NVI/MF AAAF MCP73834-NVI/MF BAAF MCP73833-CNI/MF AAAK MCP73834-CNI/MF BAAK * Consult Factory for Alternative Device Options.

Part Number *

Marking

Code

Part Number *

Marking

Code

MCP73833-AMI/UN 833AMI MCP73833-BZI/UN 833BZI MCP73833-FCI/UN 833FCI MCP73834-FCI/UN 834FCI MCP73833-GPI/UN 833GPI MCP73834-GPI/UN 834GPI MCP73833-NVI/UN 833NVI MCP73834-NVI/UN 834NVI MCP73833-CNI/UN 833CNI MCP73834-CNI/UN 834CNI * Consult Factory for Alternative Device Options.

Example:

1

AAAA

2

0633

3

256

4

56

10

9

8

7

Example:

8336SI

633256

Legend: XX...X Customer-specific information

Y Year code (last digit of calendar year) YY Year code (last 2 digits of calendar year) WW Week code (week of January 1 is week ‘01’) NNN Alphanumeric traceability code

3

e

Pb-free JEDEC designator for Matte Tin (Sn) * This package is Pb-free. The Pb-free JEDEC designator ( )

3

e

can be found on the outer packaging for this package.

Note: In the event the full Microchip part number cannot be marked on one line, it will

be carried over to the next line, thus limiting the number of available characters for customer-specific information.

MCP73833/4

10-Lead Plastic Dual-Flat No-Lead Package (MF) 3x3x0.9 mm Body (DFN) – Saw Singulated

Note: For the most current package drawings, please

see the Microchip Packaging Specification located at http://www.microchip.com/packaging

E

A

INCHES

NOM

K

EXPOSED

METAL

PAD

(

NOTE 2

EXPOSED

TIE BAR

(

NOTE 3

10

.035

.001

.118

.094

.118

.065

.010

.016

)

MAX

BOTTOM VIEW

)

MILLIMETERS

MIN

.039

.002

.124

.096

.124

.067

.015

.020

0.80

0.00

2.85

2.08

2.85

1.30

0.18

0.30

D

PIN 1

ID INDEX

AREA

NOTE 1

(

A3

Number of Pins

Pitch

Overall Height

Standoff

Lead Thickness

Overall Length

Exposed Pad Length

Overall Width

Exposed Pad Width

Lead Width

Contact Length §

Contact-to-Exposed Pad § K .008 — — 0.20 — —

*

Controlling Parameter

§

Significant Characteristic

Notes:

1.

Pin 1 visual index feature may vary, but must be located within the hatched area.

2.

Exposed pad varies according to die attach paddle size.

3.

Package may have one or more exposed tie bars at ends.

BSC: Basic Dimension. Theoretically exact value shown without tolerances.

See ASME Y14.5M

REF: Reference Dimension, usually without tolerance, for information purposes only.

See ASME Y14.5M JEDEC equivalent: Not Registered Drawing No. C04-063

)

TOP VIEW

Dimension Limits

(

Note 3

)

(

A1

Units

MIN n

e

A

A1

A3

E

)

E2

D

D2

b

L

.020 BSC

.031

.000

.008 REF.

.112

.082

.112

.051

.008

.012

pb

n

21

E2

NOM

10

0.50 BSC

0.90

0.02

0.20 REF.

3.00

2.39

3.00

1.65

0.25

0.40

Revised 09-12-05

D2

*

MAX

1.00

0.05

3.15

2.45

3.15

1.70

0.30

0.50

L

MCP73833/4

10-Lead Plastic Micro Small Outline Package (UN) (MSOP)

Note: For the most current package drawings, please

see the Microchip Packaging Specification located at http://www.microchip.com/packaging

E

E1

p

D

2

n

B

1

α

c

L

β

Units

Dimension Limits

Number of Pins

Pitch

Overall Height

Molded Package Thickness

Standoff

Overall Width

Molded Package Width

Overall Length

Foot Length

Foot Angle

Lead Thickness

Lead Width

Mold Draft Angle Top

Mold Draft Angle Bott om

*

Controlling Parameter

Notes:

Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010" (0.254 mm) per side. BSC: Basic Dimension. Theoretically exact value shown without tolerances.

See ASME Y14.5M

REF: Reference Dimension, usually witho ut tolerance, for information purposes only.

See ASME Y14.5M JEDEC Equivalent: MO-187 BA Drawing No. C04-021

n p

A

A2

A1

E

E1

D

L

φ

c

B

α

β

(F)

MIN

.030

.000

.016 .024

0° – 8°

.003

.006

5° –

INCHES

NOM

.020 BSC

.193 BSC

.118 BSC

.037 REFFFootprint

φ

10

.033

.009

A

A1

MAX NOM

.043

.037

.006

.031

–

.009

.012

MIN

15°

MILLIMETERS

0.50 BSC

–

0.75

0.00

4.90 BSC

3.00 BSC

0.40

0.95 REF

0.08

0.15

5° 15°

Revised 09-16-05

*

MAX

10

–

0.85

0.60

–

0.23

–

A2

1.10

0.95

0.15

0.80

8°0°

0.23

0.30

APPENDIX A: REVISION HISTORY

Revision A (September 2006)

• Original Release of this Document.

MCP73833/4

NOTES:

MCP73833/4

PRODUCT IDENTIFICATION SYSTEM

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

PART NO. XX

Device

Output

X/

Tem p.XXPackage

Options*

Device: MCP73833: 1A Fully Integrated Charger,

MCP73833T: 1A Fully Integrated Charger,

MCP73834: 1A Fully Integrated Charger,

MCP73834T: 1A Fully Integrated Charger,

Output Options * * * Refer to table below for different operational options.

* * Consult Factory for Alternative Device Options.

Temperature: I = -40°C to +85°C

function on pin 7

PG

function on pin 7

(Tape and Reel)

function on pin 7

TE

function on pin 7

TE (Tape and Reel)

Examples: * *

a) MCP73833-AMI/UN: 10-lead MSOP pkg. b) MCP73833-BZI/UN: 10-lead MSOP pkg. c) MCP73833-CNI/MF: 10-lead DFN pkg. d) MCP73833-FCI/UN: 10-lead MSOP pkg. e) MCP73833-GPI/UN: 10-lead MSOP pkg. f) MCP73833-NVI/MF: 10-lead DFN pkg.

a) MCP73834-CNI/MF: 10-lead DFN pkg. b) MCP73834-FCI/UN: 10-lead MSOP pkg. c) MCP73834-GPI/UN: 10-lead MSOP pkg. d) MCP73834-NVI/MF: 10-lead DFN pkg.

* * Consult Factory for Alternative Device Options

Package Type: MF = Plastic Dual Flat No Lead (DFN)

Part Number V

(3x3x0.9 mm Body), 10-lead

UN = Plastic Micro Small Outline Package (MSOP),

10-lead

REG

I

PREG/IREG

V

PTH/VREG

I

TERM/IREG

V

RTH/VREG

Timer Period

MCP73833-AMI/MF 4.20V 10% 71.5% 7.5% 96.5% 0 hours

MCP73833-BZI/MF 4.20V 100% N/A 7.5% 96.5% 0 hours

MCP73833-CNI/MF 4.20V 10% 71.5% 20% 94% 4 hours

MCP73833-FCI/MF 4.20V 10% 71.5% 7.5% 96.5% 6 hours

MCP73833-GPI/MF 4.20V 100% N/A 7.5% 96.5% 6 hours

MCP73833-NVI/MF 4.35V 10% 71.5% 7.5% 96.5% 6 hours

MCP73833-AMI/UN 4.20V 10% 71.5% 7.5% 96.5% 0 hours

MCP73833-FCI/UN 4.20V 10% 71.5% 7.5% 96.5% 6 hours

MCP73834-BZI/MF 4.20V 100% N/A 7.5% 96.5% 0 hours

MCP73834-CNI/MF 4.20V 10% 71.5% 20% 94% 4 hours

MCP73834-FCI/MF 4.20V 10% 71.5% 7.5% 96.5% 6 hours

MCP73834-NVI/MF 4.35V 10% 71.5% 7.5% 96.5% 6 hours

MCP73834-FCI/UN 4.20V 10% 71.5% 7.5% 96.5% 6 hours

MCP73833/4

NOTES:

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.

Trademarks

The Microchip name and logo, the Microchip logo, Accuron, dsPIC, K

EELOQ, microID, MPLAB, PIC, PICmicro, PICSTART,

PRO MATE, PowerSmart, rfPIC, and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active Thermistor, Mindi, MiWi, MPASM, MPLIB, MPLINK, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance, UNI/O, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their respective companies.

Printed on recycled paper.

Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona, Gresham, Oregon and Mountain View, California. The Company’s quality system processes and procedures are for its PICmicro EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified.

®

8-bit MCUs, KEELOQ

®

code hopping devices, Serial

WORLDWIDE SALES AND SERVICE

AMERICAS

Corporate Office

2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://support.microchip.com Web Address: www.microchip.com

Atlanta

Alpharetta, GA Tel: 770-640-0034 Fax: 770-640-0307

Boston

Westborough, MA Tel: 774-760-0087 Fax: 774-760-0088

Chicago

Itasca, IL Tel: 630-285-0071 Fax: 630-285-0075

Dallas

Addison, TX Tel: 972-818-7423 Fax: 972-818-2924

Detroit

Farmington Hills, MI Tel: 248-538-2250 Fax: 248-538-2260

Kokomo

Kokomo, IN Tel: 765-864-8360 Fax: 765-864-8387

Los Angeles

Mission Viejo, CA Tel: 949-462-9523 Fax: 949-462-9608

Santa Clara

Santa Clara, CA Tel: 408-961-6444 Fax: 408-961-6445

Toronto

Mississauga, Ontario, Canada Tel: 905-673-0699 Fax: 905-673-6509

ASIA/PACIFIC

Asia Pacific Office

Suites 3707-14, 37th Floor Tower 6, The Gateway Habour City, Kowloon Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431

Australia - Sydney

Tel: 61-2-9868-6733 Fax: 61-2-9868-6755

China - Beijing

Tel: 86-10-8528-2100 Fax: 86-10-8528-2104

China - Chengdu

Tel: 86-28-8665-5511 Fax: 86-28-8665-7889

China - Fuzhou

Tel: 86-591-8750-3506 Fax: 86-591-8750-3521

China - Hong Kong SAR

Tel: 852-2401-1200 Fax: 852-2401-3431

China - Qingdao

Tel: 86-532-8502-7355 Fax: 86-532-8502-7205

China - Shanghai

Tel: 86-21-5407-5533 Fax: 86-21-5407-5066

China - Shenyang

Tel: 86-24-2334-2829 Fax: 86-24-2334-2393

China - Shenzhen

Tel: 86-755-8203-2660 Fax: 86-755-8203-1760

China - Shunde

Tel: 86-757-2839-5507 Fax: 86-757-2839-5571

China - Wuhan

Tel: 86-27-5980-5300 Fax: 86-27-5980-5118

China - Xian

Tel: 86-29-8833-7250 Fax: 86-29-8833-7256

ASIA/PACIFIC

India - Bangalore

Tel: 91-80-4182-8400 Fax: 91-80-4182-8422

India - New Delhi

Tel: 91-11-4160-8631 Fax: 91-11-4160-8632

India - Pune

Tel: 91-20-2566-1512 Fax: 91-20-2566-1513

Japan - Yokohama

Tel: 81-45-471- 6166 Fax: 81-45-471-6122

Korea - Gumi

Tel: 82-54-473-4301 Fax: 82-54-473-4302

Korea - Seoul

Tel: 82-2-554-7200 Fax: 82-2-558-5932 or 82-2-558-5934

Malaysia - Penang

Tel: 60-4-646-8870 Fax: 60-4-646-5086

Philippines - Manila

Tel: 63-2-634-9065 Fax: 63-2-634-9069

Singapore

Tel: 65-6334-8870 Fax: 65-6334-8850

Taiwan - Hsin Chu

Tel: 886-3-572-9526 Fax: 886-3-572-6459

Taiwan - Kaohsiung

Tel: 886-7-536-4818 Fax: 886-7-536-4803

Taiwan - Taipei

Tel: 886-2-2500-6610 Fax: 886-2-2508-0102

Thailand - Bangkok

Tel: 66-2-694-1351 Fax: 66-2-694-1350

EUROPE

Austria - Wels

Tel: 43-7242-2244-3910 Fax: 43-7242-2244-393

Denmark - Copenhagen

Tel: 45-4450-2828 Fax: 45-4485-2829

France - Paris

Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79

Germany - Munich

Tel: 49-89-627-144-0 Fax: 49-89-627-144-44

Italy - Milan

Tel: 39-0331-742611 Fax: 39-0331-466781

Netherlands - Drunen

Tel: 31-416-690399 Fax: 31-416-690340

Spain - Madrid

Tel: 34-91-708-08-90 Fax: 34-91-708-08-91

UK - Wokingham

Tel: 44-118-921-5869 Fax: 44-118-921-5820

08/29/06

MICROCHIP MCP73833, MCP73834 Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual

1.0 ELECTRICAL CHARACTERISTICS

FIGURE 2-11: Power Supply Ripple Rejection (PSRR).

FIGURE 2-12: Power Supply Ripple Rejection (PSRR).

FIGURE 2-13: Line Transient Response.

FIGURE 2-16: Load Transient Response.

FIGURE 2-14: Line Transient Response.

FIGURE 2-15: Load Transient Response.

3.0 PIN DESCRIPTIONS

3.7 Thermistor Input (THERM)

3.4 Current Regulation Set (PROG)

4.0 FUNCTIONAL DESCRIPTION

FIGURE 4-1: Flow Chart.

4.1 Under Voltage Lockout (UVLO)

4.2 Charge Qualification

4.4 Constant Current - Fast Charge Mode

4.5 Constant Voltage Mode

4.3 Preconditioning

4.6 Charge Termination

4.7 Automatic Recharge

4.8 Thermal Regulation

4.9 Thermal Shutdown

FIGURE 4-2: Thermal Regulation.

5.0 DETAILED DESCRIPTION

5.1 Analog Circuitry

5.2 Digital Circuitry

TABLE 5-1: STATUS OUTPUTS

6.0 APPLICATIONS

FIGURE 6-1: Typical Application Circuit.

6.1 Application Circuit Design

6.2 PCB Layout Issues

FIGURE 6-4: Typical Layout (Top).

FIGURE 6-5: Typical Layout (Bottom).

7.0 PACKAGING INFORMATION