MICROCHIP MCP73871 Technical data

MCP73871

Stand-Alone System Load Sharing and Li-Ion / Li-Polymer

Battery Charge Management Controller

Features

• Integrated System Load Sharing and Battery
Charge Management

- Simultaneously Power the System and

Charge the Li-Ion Battery

- Voltage Proportional Current Control (VPCC)

ensures system load has priority over Li-Ion
battery charge current

- Low-Loss Power-Path Management with

Ideal Diode Operation

• Complete Linear Charge Management Controller

- Integrated Pass Transistors

- Integrated Current Sense

- Integrated Reverse Discharge Protection

- Selectable Input Power Sources: USB Port or

AC-DC Wall Adapter

• Preset High Accuracy Charge Voltage Options:

- 4.10V, 4.20V, 4.35V or 4.40V

- ±0.5% Regulation Tolerance

• Constant Current / Constant Voltage (CC/CV)
Operation with Thermal Regulation

• Maximum 1.8A Total Input Current Control

• Resistor Programmable Fast Charge Current
Control: 50 mA to 1A

• Resistor Programmable Termination Set Point

• Selectable USB Input Cur rent Control

- Absolute Maximum: 100 mA (L) / 500 mA (H)

• Automatic Recharge

• Automatic End-of-Charge Control

• Safety Timer With Timer Enable/Disable Control

• 0.1C Preconditioning for Deeply Depleted Cells

• Battery Cell Temperature Monitor

• Undervoltage Lockout (UVLO)

• Low Battery Status Indicator (LBO

• Power-Good Status Indicator (PG

• Charge Status and Fault Condition Indicators

• 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

• Temperature Range: -40°C to 85°C

• Packaging: 20-Lead QFN (4 mm x 4 mm)

)

)

Applications

• GPSs / Navigators

• PDAs and Smart Phones

• Portable Media Players and MP3 Players

• Digital Cameras

• Bluetooth Headsets

• Portable Medical Devices

• Charge Cradles / Docking Stations

•Toys

Description

The MCP73871 device is a fully integrated linear
solution for system load sharing and Li-Ion / Li-Polymer
battery charge management with ac-dc wall adapter
and USB port power sources selection. It’s also
capable of autonomous power source selection
between input or battery. Along with its small physical
size, the low number of required external components
makes the device ideally suited for portable
applications.

The MCP73871 device automatically obtains power for
the system load from a single-cell Li-Ion battery or an
input power source (ac-dc wall adapter or USB port).
The MCP73871 device specifically adheres to the
current drawn limits governed by the USB specification.
With an ac-dc wall adapter providing power to the
system, an external resistor sets the magnitude of 1A
maximum charge current while supports up to 1.8A
total current for system load and battery charge
current.

The MCP73871 device employs a constant current /
constant voltage (CC/CV) charge algorithm with select­able charge termination point. The constant voltage
regulation is fixed with four available options: 4.10V,

4.20V , 4.35V , or 4.40V to accommodate new , emerging
battery charging requirements. The MCP73871 device
also 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.

The MCP73871 device includes a low battery indicator,
a power-good indicator and two charge status indica­tors that allows for outputs with LEDs or communica­tion with host microcontrollers. The MCP73871 device
is fully specified over the ambient temperature range of

-40°C to +85°C.

© 2008 Microchip Technology Inc. DS22090A-page 1

MCP73871

2
3
4
511

12

13

14

PROG2

IN

STAT1 / LBO

PG

THERM

MCP73871

20-Lead QFN

STAT2

1 15

PROG1

6789 10

20 19 18 17 16

IN

OUT

OUT

CE

SEL

PROG3

TE

EXPOSED
PAD

V

BAT

V

BAT

VPCC

V

SS

V

SS

V

SS

V

BAT_SENSE

STAT1
LBO

IN OUT

P

G

V

BAT

Single-Cell
Li-Ion Battery

7

MCP73871 Typical Application

1, 20

8

18, 19

10 µF

10, 11, EP

Ac-dc Adapter
or
USB Port

STAT2

THERM

V

SS

PROG1

PROG3

12

13

R

PROG1

6

5

14, 15, 16

470Ω

470Ω

470Ω

2

4.7 µF

System
Load

SEL

T

E

PROG2

Hi

Low

Hi

Low

Hi

Low

3

4

9

R

PROG3

VPCC

NTC

10 kΩ

Hi

Low

17

CE

4.7 µF

Package Types

Typical Application Circuit

DS22090A-page 2 © 2008 Microchip Technology Inc.

MCP73871

STAT1

PROG1

V

BAT

G=0.001

V

SS

Direction

Control

TERM

+

-

+

-

LTVT

+

-

HTVT

THERM

50 µA

UVLO,
REFERENCE,
CHARGE
CONTROL,
TIMER,
AND
STATUS
LOGIC

STAT2

PG

Direction

Control

G=0.001

G=0.001

PROG2

IN

+

-

CURRENT
LIMIT

V

REF

G=0.001

+

-

CURRENT
LIMIT

V

REF

/2

PROG3

+

-

CA

V

REF

PRECONDITION

+

-

V

REF

+

-

VA

V

REF

V

REF

SEL

OUT

V

REF

TE

0.2Ω

0.2Ω

Ideal
Diode,
Synchronous
Switch

CHRG

+

-

V

REF

+

-

V

REF

VPCC

CE

V

BAT_SENSE

Functional Block Diagram

© 2008 Microchip Technology Inc. DS22090A-page 3

MCP73871

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 indicated in the

Absolute Maximum Ratings†

VIN....................................................................................7.0V

All Inputs and Outputs w.r.t. ................V

(V

= VIN or V

DD

Maximum Junction Temperature, T

BAT

)

-0.3V to VDD+0.3V

SS

............Internally Limited

J

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

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

DC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, all limits apply for VIN = V

Typical values are at +25°C, V

IN

= [V

REG

(typical) + 1.0V]

Parameters Sym Min Typ Max Units Conditions

Supply Input

V

Supply Voltage V

Supply Current I

SS

IN

REG

+0.3V

— 2500 3750 µA Charging

—6V

— 260 350 µA Charge Complete
— 180 300 µA Standby
— 28 50 µA Shutdown

V

+

–

V

REG

0.15V

V

REG

0.07V

UVLO Start Threshold V

UVLO Stop Threshold V

UVLO Hysteresis V

START

STOP

HYS

REG

0.05V

V

REG

0.07V
—90—mV

Voltage Regulation (Constant Voltage Mode)

Regulated Charge Voltage V

REG

4.080 4.10 4.121 V VDD=[V

4.179 4.20 4.221 V I

4.328 4.35 4.372 V T

4.378 4.40 4.422

Regulated Charge Voltage Tolerance V

RTOL

-0.5 — +0.5 % TA= +25°C

-0.75 — +0.75 % T

Line Regulation |(ΔV

Load Regulation |ΔV

BAT/VBAT

ΔV

BAT/VBAT

)/

— 0.08 0.20 %/V V

|

DD

| — 0.08 0.18 % I

Supply Ripple Attenuation PSRR — -47 — dB I

—-40—dBI

Current Regulation (Fast Charge Constant-Current Mode)

AC-Adapter Fast Charge Current I

REG

90 100 110 mA PROG1 = 10 kΩ

900 1000 1100 mA PROG1 = 1kΩ,

USB Fast Charge Current I

REG

80 90 100 mA PROG2 = Low, SEL = Low,

400 450 500 mA PROG2 = High, SEL = Low,

Note 1: The value is ensured by design and not production tested.

2: The maximum available charge current is also limited by the value set at PROG1 input.

+ 0.3V to 6V, TA = -40°C to +85°C.

REG

+

V

+

REG

VVDD= Low to High

0.25V

+

V

+

REG

0.17V

VVDD= High to Low

< V

(V

DD

V

< V

DD

OUT

=-5°C to +55°C

A

= -5°C to +55°C

A

=[V

DD

I

OUT
OUT

V

= [V

DD
OUT
OUT

=-5°C to +55°C, SEL = Hi

T

A

- 100 mV or

BAT

)

STOP

(typical)+1V]

REG

=10 mA

(typical)+1V] to 6V

REG

=10 mA
=10 mA to 150 mA

(typical)+1V]

REG

=10mA, 1kHz
=10 mA, 10 kHz

(Note 2)

(Note 2)

= -5°C to +55°C

T

A

DS22090A-page 4 © 2008 Microchip Technology Inc.

DC CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise indicated, all limits apply for VIN = V

Typical values are at +25°C, V

IN

= [V

REG

(typical) + 1.0V]

Parameters Sym Min Typ Max Units Conditions

Input Current Limit Control (ICLC)

USB-Port Supply Current Limit I

LIMIT_USB

80 90 100 mA PROG2 = Low, SEL = Low

400 450 500 mA PROG2 = High, SEL = Low

AC-DC Adapter Current Limit I

LIMIT_AC

1500 1650 1800 mA SEL = High, TA=-5°C to +55°C

Voltage Proportional Charge Control (VPCC - Input Voltage Regulation)

VPCC Input Threshold V
VPCC Input Threshold Tolerance V
Input Leakage Current I

VPCC
RTOL

LK

—1.23—VI

-3 — +3 % TA=-5°C to +55°C

—0.011µAV

Precondition Current Regulation (Trickle Charge Constant-Current Mode)

Precondition Current Ratio I

Precondition Current Threshold Ratio V

PREG

PTH

Precondition Hysteresis V

/ I

/ V

PHYS

REG

REG

7.5 10 12.5 % PROG1 = 1.0 kΩ to 10 kΩ

69 72 75 % V
— 105 — mV V

Automatic Charge Termination Set Point

Charge Termination Current Ratio I

TERM

75 100 125 mA PROG3 = 10 kΩ

7.5 10 12.5 mA PROG3 = 100 kΩ

Automatic Recharge

V

-

Recharge Voltage Threshold Ratio V

RTH

REG

0.21V

V

0.15V

IN-to-OUT Pass Transistor ON-Resistance

ON-Resistance R

DS_ON

— 200 — mΩ VDD = 4.5V, TJ = 105°C

Charge Transistor ON-Resistance

ON-Resistance R

DSON_

— 200 — mΩ VDD = 4.5V, TJ = 105°C

Ideal Diode ON-Resistance

ON-Resistance R
Diode Forward Voltage Drop V

DS_ON

FWD

— 200 — mΩ VDD = 4.5V, TJ = 105°C
— 0.7 1 V Switch Off (Note 1)

Battery Discharge Current

Output Reverse Leakage Current I

DISCHARGE

— 30 40 µA Shutdown

— 30 40 µA Shutdown (0 < V
—3040µAV
— -6 -13 µA Charge Complete

Status Indicators - STAT1 ( LBO

Sink Current I
Low Output Voltage V
Input Leakage Current I

Low Battery Indicator (LBO

Low Battery Detection Threshold V

), STAT2, PG

)

SINK

OL

LK

LBO

—1635mA
—0.41VI
— 0.01 1 µA High Impedance, VDD on pin

— Disable — V

2.85 3.0 3.15 V T

2.95 3.1 3.25 V

3.05 3.2 3.35 V

Low Battery Detection Hysteresis V

LBO_HYS

— 150 — mV V

Note 1: The value is ensured by design and not production tested.

2: The maximum available charge current is also limited by the value set at PROG1 input.

REG

REG

-

MCP73871

+ 0.3V to 6V, TA = -40°C to +85°C.

=-5°C to +55°C

T

A

=10 mA

OUT

= V

V

REG

0.09V

-

VPCC

T

A

BAT
BAT

T

A

VV

BAT

(V

BAT

SINK

BAT

A

BAT

DD

=-5°C to +55°C

Low to High
High to Low

=-5°C to +55°C

High to Low

< VDD < V

BAT

= Power Out, No Load

= 4 mA

> VIN, PG = Hi-Z

=-5°C to +55°C

Low to High

UVLO

DD

< V

)

)

BAT

© 2008 Microchip Technology Inc. DS22090A-page 5

MCP73871

DC CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise indicated, all limits apply for VIN = V

Typical values are at +25°C, V

IN

= [V

REG

(typical) + 1.0V]

Parameters Sym Min Typ Max Units Conditions

PROG1 Input (PROG1)

Charge Impedance Range R

PROG

1—20kΩ

PROG3 Input (PROG3)

Termination Impedance Range R

PROG

5 — 100 kΩ

PROG2 Input (PROG2)

Input High Voltage Level V
Input Low Voltage Level V
Input Leakage Current I

IH
IL

LK

1.8 — — V
——0.8V
—0.011µAV

Timer Enable (TE)

Input High Voltage Level V
Input Low Voltage Level V
Input Leakage Current I

IH
IL

LK

1.8 — — V Note 1
——0.8VNote 1
—0.011µAV

Chip Enable (CE)

Input High Voltage Level V
Input Low Voltage Level V
Input Leakage Current I

IH
IL

LK

1.8 — — V
——0.8V
—0.011µAVCE = V

Input Source Selection (SEL)

Input High Voltage Level V
Input Low Voltage Level V
Input Leakage Current I

IH
IL

LK

1.8 — — V
——0.8V
—0.011µAV

Thermistor Bias

Thermistor Current Source I

THERM

47 50 53 µA 2 kΩ < R

Thermistor Comparator

Upper Trip Threshold V
Upper Trip Point Hysteresis V
Lower Trip Threshold V
Lower Trip Point Hysteresis V

T1

T1HYS

T2

T2HYS

1.20 1.24 1.26 V VT1 Low to High
—-40—mV

0.23 0.25 0.27 V VT2 High to Low
—40—mV

Thermal Shutdown

Die Temperature T
Die Temperature Hysteresis T

SD

SDHYS

— 150 — °C
—10—°C

Note 1: The value is ensured by design and not production tested.

2: The maximum available charge current is also limited by the value set at PROG1 input.

REG

+ 0.3V to 6V, TA = -40°C to +85°C.

= V

PROG2

TE

SEL

= V

= V

DD

DD

DD

THERM

DD

< 50 kΩ

DS22090A-page 6 © 2008 Microchip Technology Inc.

AC CHARACTERISTICS

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

Typical values are at +25°C, V

DD

= [V

(typical) + 1.0V]

REG

Parameters Sym Min Typ Max Units Conditions

UVLO Start Delay t

START

—— 5 msVDD Low to High

Current Regulation

Transition Time Out of Precondition t
Current Rise Time Out of Precondition t
Precondition Comparator Filter Time t
Termination Comparator Filter Time t

Comparator Filter Time t

Charge
Thermistor Comparator Filter Time t

DELAY

RISE

PRECON

TERM

CHARGE

THERM

——10 msV
——10 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

Elapsed Timer

Elapsed Timer Period t

ELAPSED

— 0 — Hours

3.6 4.0 4.4 Hours

5.4 6.0 6.6 Hours

7.2 8.0 8.8 Hours

Status Indicators

Status Output Turn-off t
Status Output Turn-on t

OFF

ON

— — 500 µs I
— — 500 µs I

Note 1: Internal safety timer is tested base on internal oscillator frequency measurement.

= 4.6V to 6V.

IN

MCP73871

< V

to V

BAT

PTH

Rising to 90% of I

OUT

BAT

OUT

BAT

= 1 mA to 0 mA

SINK

= 0 mA to 1 mA

SINK

BAT

Rise/Fall

Falling

Falling

> V

PTH

REG

TEMPERATURE SPECIFICATIONS

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

Typical values are at +25°C, V

Parameters Sym Min Typ Max Units Conditions

Temperature Ranges

Specified Temperature Range T
Operating Temperature Range T
Storage Temperature Range T

Thermal Package Resistances

Thermal Resistance, 20LD-QFN, 4x4 θ

DD

= [V

(typical) + 1.0V]

REG

A
J
A

JA

-40 — +85 °C

-40 — +125 °C

-65 — +150 °C

— 35 — °C/W 4-Layer JC51-7 Standard Board,

= 4.6V to 6V.

IN

Natural Convection

© 2008 Microchip Technology Inc. DS22090A-page 7

MCP73871

4.176

4.184

4.192

4.200

4.208

4.216

4.224

4.232

4.240

4.6 4.9 5.1 5.4 5.6 5.9

Supply Volta ge (V)

Battery Regulation Voltage (V)

Temperature = +25°C

I

OUT

= 100 mA

I

OUT

= 500 mA

I

OUT

= 900 mA

I

OUT

= 10 mA

4.190

4.198

4.206

4.214

4.222

4.230

4.238

-45 -30 -15 0 15 30 45 60 75 90

Ambient Temperature (°C)

Battery Regulation Voltage (V)

I

OUT

= 10 mA

I

OUT

= 100 mA

I

OUT

= 500 mA

I

OUT

= 1000 mA

0

100

200

300

400

500

600

700

800

900

1000

1234567891011121314151617181920

R

PROG

(kΩ)

I

REG

(mA)

V

DD

Temperature = +25°C

4.100

4.120

4.140

4.160

4.180

4.200

4.220

4.240

4.260

4.280

4.300

0

100

200

300

400

500

600

700

800

900

1000

Charge Current (mA)

(V)

Temperature = +25°C

V

DD

10.0

15.0

20.0

25.0

30.0

35.0

40.0

-45 -30 -15 0 15 30 45 60 75 90
Temperature (°C)

(µA)

V

BAT

= 4.2V

V

DD

= Floating

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

3.0 3.2 3.4 3.6 3.8 4.0 4.2
Battery Voltage (V)

(µA)

VDD= V

BAT

Temperature = +25°C

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, VIN = [V

(typical) + 1V], I

REG

FIGURE 2-1: Battery Regulation Voltage
(V

) vs. Supply Voltage (VDD).

BAT

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

OUT

Battery Regulation Voltage

FIGURE 2-4: Charge Current (I
Battery Regulation Voltage (V

BAT

OUT

).

= 5.2V

) vs.

FIGURE 2-2: Battery Regulation Voltage

) vs. Ambient Temperature (TA).

(V

BAT

FIGURE 2-3: Charge Current (I
Programming Resistor (R

DS22090A-page 8 © 2008 Microchip Technology Inc.

Battery Discharge Current

FIGURE 2-5: Output Leakage Current
(I

DISCHARGE

= 5.2V

Battery Discharge Current

PROG

).

OUT

) vs.

FIGURE 2-6: Output Leakage Current
(I

DISCHARGE

(V

BAT

) vs. Ambient Temperature (TA).

) vs. Battery Regulation Voltage

).

MCP73871

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

3.03.23.43.63.84.04.2
Battery Voltage (V)

(µA)

VDD= Floating
Temperat ure = +25° C

800

830

860

890

920

950

980

1010

1040

1070

1100

1130

1160

1190

4.5 4.8 5.0 5.3 5. 5 5.8 6.0
Supply Voltage (V)

I

REG

(mA)

R

PROG

= 1 kΩ

Temperature = +25°C

450

460

470

480

490

500

510

520

530

540

550

4.5 4.8 5.0 5 .3 5.5 5.8 6.0
Supply Voltage (V)

I

REG

(mA)

PROG

= 2 kΩ

T

90

92

94

96

98

100

102

104

106

108

110

4.54.8 5.05.35.55.86.0
Supply Voltage (V)

I

REG

(mA)

R

PROG

= 10 kΩ

Temp eratu re = +2 5°C

700

740

780

820

860

900

940

980

1020

1060

1100

-45 -30 -15 0 15 30 45 60 75 90

Ambient Temperature (°C)

Charge Current (mA)

R

PROG

V

DD

V

90

92

94

96

98

100

102

104

106

108

110

-45 -30 -15 0 15 30 45 60 75 90

Ambient Temperature (°C)

Charge Current (mA)

R

PROG

= 10 kΩ

V

DD

Note: Unless otherwise indicated, VIN = [V

Battery Discharge Current

(typical) + 1V], I

REG

FIGURE 2-7: Output Leakage Current
(I

DISCHARGE

) vs. Battery Voltage (V

BAT

).

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

OUT

FIGURE 2-10: Charge Current (I
Supply Voltage (V

DD

).

OUT

) vs.

FIGURE 2-8: Charge Current (I
Supply Voltage (V

R

emperat ure = +25°C

DD

).

FIGURE 2-9: Charge Current (I
Supply Voltage (V

DD

).

OUT

OUT

) vs.

) vs.

FIGURE 2-11: Charge Current (I
Ambient Temperature (T

).

A

FIGURE 2-12: Charge Current (I
Ambient Temperature (T

).

A

= 1 kΩ

= 5.2

OUT

OUT

) vs.

= 5.2V

) vs.

© 2008 Microchip Technology Inc. DS22090A-page 9

MCP73871

41

43

45

47

49

51

53

55

-45 -30 -15 0 15 30 45 60 75 90
Ambient Temperature (°C)

Charge Current (mA)

R

PROG

= 20 kΩ

V

DD

= 5.2V

0

200

400

600

800

1000

1200

25 50 75 100 125 150

Ambient Temperature (°C)

Charge Current (mA)

VDD = 5.2V
R

PROG

= 1 kΩ

0

100

200

300

400

500

600

25 50 75 100 125 150

Ambient Temperature (°C)

Charge Current (mA)

VDD = 5.2V
R

PROG

= 2 kΩ

0

20

40

60

80

100

120

25 50 75 100 125 150

Ambient Temperature (°C)

Charge Current (mA)

VDD = 5.2V
R

PROG

= 10 kΩ

47.0

47.5

48.0

48.5

49.0

49.5

50.0

50.5

51.0

51.5

52.0

4.6 4.8 5.0 5 .2 5.4 5.6 5.8 6.0

Supply Voltage (V)

Thermistor Current (µA)

Temperature = +25°C

47.0

47.5

48.0

48.5

49.0

49.5

50.0

50.5

51.0

51.5

52.0

-45 -30 -15 0 15 30 45 60 75 90
Ambient Temperature (°C)

Thermistor Current (µA)

VDD = 5.2V

Note: Unless otherwise indicated, VIN = [V

FIGURE 2-13: Charge Current (I
Ambient Temperature (T

).

A

(typical) + 1V], I

REG

) vs.

OUT

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

OUT

FIGURE 2-16: Charge Current (I
Junction Temperature (T

).

J

OUT

) vs.

FIGURE 2-14: Charge Current (I
Junction Temperature (T

FIGURE 2-15: Charge Current (I
Junction Temperature (T

DS22090A-page 10 © 2008 Microchip Technology Inc.

) vs.

).

J

).

J

OUT

OUT

) vs.

FIGURE 2-17: Thermistor Current (I
vs. Supply Voltage (V

DD

).

FIGURE 2-18: Thermistor Current (I
vs. Ambient Temperature (T

).

A

THERM

THERM

)

)