ON Semiconductor NCP1835B User Manual

NCP1835B

Integrated Li−Ion Charger

NCP1835B is an integrated linear charger specifically designed to charge 1−cell Li−Ion batteries with a constant current, constant voltage (CCCV) profile.

Its low input voltage capability, adjustable charge current, ability to maintain regulation without a battery, and its onboard thermal foldback make it versatile enough to charge from a variety of wall adapters. The NCP1835B can charge from a standard wall adapter or from the USB port. It has been optimized to charge low capacity batteries such as those found in wireless headsets and flash memory−based MP3 players.

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MARKING DIAGRAM

Features

• Integrated Voltage and Current Regulation

• No External MOSFET, Sense Resistor or Blocking Diode Required

• Charge Current Thermal Foldback

• Integrated Pre−charge Current for Conditioning a Deeply

Discharged Battery

• Integrated End−of−Charge (EOC) Detection

• 1% Voltage Regulation

• 4.2 V Regulated Output Voltage

• Regulation Maintained without a Battery Present

• Programmable Full Charge Current

• Open−Drain Charger Status and Fault Alert Flags

• 2.8 V Output for AC Present Indication and Powering Charging

Subsystems

• Minimum Input Voltage of 2.4 V Allows Use of Current Limited

Adapters

• Automatically Recharging if Battery Voltage Drops after Charging

Cycle is Completed

• Low Profile 3x3 mm DFN Package

• Pb−Free Package is Available

T ypical Applications

• Wireless Headsets

• MP3 Players

• USB Appliances

• Battery Operated Devices

1835B

9 8 7 6

ALYWG

BAT VSNS

ISEL V2P8

Shipping

†

DFN 3x3 MN SUFFIX CASE 485C

1835B = Device Code A = Assembly Location L = Wafer Lot Y = Year W = Work Week G = Pb−Free Package

(Note: Microdot may be in either location)

PIN CONNECTIONS

FAULT

CFLG

TIMER

Device

NCP1835BMNR2 DFN−10 3000 Units/Reel

DFN 3x3

3 4

GND

(Top View)

ORDERING INFORMATION

Package

September, 2006 − Rev . 4

NCP1835BMNR2G DFN−10

(Pb−Free)

†For information on tape and reel specifications,

including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D.

1 Publication Order Number:

3000 Units/Reel

NCP1835B/D

NCP1835B

CFLG

Microprocessor

V2P8

VSNS

NCP1835B

BAT

GND

15 nF C

0.1 mF C

2p8

4.7 mF C

out

4.7 mF

FAULT

ISEL TIMER

1.6 M R

ISEL

GND

Figure 1. Typical 50 mA Application Circuit

PIN FUNCTION DESCRIPTION

Pin Symbol Description

1 V

2 FAULT An open−drain output indicating fault status. This pin is pulled LOW under any fault conditions. A FAULT condition

3 CFLG An open−drain output indicating charging or end−of−charge states. The CFLG pin is pulled LOW when the charger

4 TIMER Connecting a timing capacitor, C

5 GND Ground pin of the IC. For thermal consideration, it is recommended to solder the exposed metal pad on the back-

6 EN Enable logic input. Connect the EN pin to LOW to disable the charger or leave it floating to enable the charger . 7 V2P8 2.8 V reference voltage output. This pin outputs a 2.8 V voltage source when an adapter is present. The maximum

8 ISEL The full charge current (I

9 VSNS Battery voltage sense pin. Connect this as close as possible to the battery input connection.

10 BAT Charge current output. A minimum 4.7 mF capacitor is needed for stability when the battery is not attached.

Input Supply Voltage. Provides power to the charger. This pin should be bypassed with at least a 4.7 mF ceramic capacitor to ground.

resets the counter.

is charging a battery. It is forced open when the charge current drops to I latched until a recharge cycle or a new charge cycle starts.

between this pin and ground to set end−of−charge timeout timer. TIMEOUT = 14*C Trickle Charge has a time limit of 1/8 of the TIMEOUT period.

/1.0 nF (minute). The total charge for CC and CV mode is limited to the length of TIMEOUT.

TIME

. This high impedance mode will be

EOC

side of the package to ground.

loading for this pin is 2.0 mA.

) can be set by connecting a resistor, R

For best accuracy, a resistor with 1% tolerance is recommended.

FCHG

, from the ISEL pin to ground.

ISEL

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NCP1835B

V2P8

CFLG

FAULT

Startup, Control & Clamp

V2P8

VCC Resistor Dividers

Bias Circuits

VREF

Chip Enable

EN GNDTIMER

Figure 2. Detailed Block Diagram

Control

LOGIC

TIMER

Temp

VREF

Recharge Comp

Precharge Comp

Timer Comp

IREF

Vbat Resistor Dividers

VREF

BAT

ISEL

VSNS

MAXIMUM RATINGS

Rating Symbol Value Unit

Supply Voltage V Status Flag Output Pins V Voltage Range for Other Pins V Current Out from BAT Pin I

FAULT

, V

CFLG

Thermal Characteristics Thermal Resistance, Junction−to−Air (Note 3) Power Dissipation, TA = 25°C (Note 3)

Moisture Sensitivity (Note 4) MSL Level 1 Operating Ambient Temperature T Storage Temperature T

stg

ESD Human Body Model Machine Model

HBM

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.

1. This device series contains ESD protection and is tested per the following standards: Human Body Model (HBM) per JEDEC standard: JESD22−A114. Machine Model (MM) per JEDEC standard: JESD22−A115.

2. Latchup Current Maximum Rating: 150 mA per JEDEC standard: JESD78.

3. Measure on 1 inch sq. of 1 oz. copper area. R

sq. of 1 oz. copper area on 4 layer PCB that has 1 single signal layer with the additional 3 solid ground or power planes. The maximum package

is highly dependent on the PCB heatsink area. For example, R

power dissipation limit must not be exceeded:

with R

4. Moisture Sensitivity Level per IPC/JEDEC standard: J−STD−020A.

* T

J(max)

qJA

= 68.5°C/W, T

= 100°C, PD = 1.09 W.

J(max)

7.0 V

5.5 V

1.2 A

68.5

1.09

°C/W

−20 to 70 °C

−55 to 125 °C

2000

200

can be 38°C/W on 1 inch

V V

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NCP1835B

ELECTRICAL CHARACTERISTICS (Typical values are tested at V

= 5.0 V and room temperature, maximum and minimum values

are guaranteed over 0°C to 70°C with a supply voltage in the range of 4.3 V to 6.5 V, unless otherwise noted.)

Characteristic Symbol Min Typ Max Unit

VCC SUPPL Y

Operating Supply Range V Rising VCC Threshold V Falling VCC Lockout Threshold V

CC RISE FALL

Quiescent VCC Pin Supply Current Shutdown (EN = Low) Normal Operation (EN = High)

Battery Drain Current Manual Shutdown (VCC = 5.0 V , VSNS = 4.0 V, EN = Low)

VCC

BMS

CHARGING PERFORMANCE

Regulated Output Voltage in Constant Voltage (CV) Mode, I Dropout Voltage (V

= 3.7 V , I

BAT

= 0.1 A) − − 80 120 mV

CHG

Pre−Charge Threshold Voltage V Pre−Charge Current (R Pre−Charge Current (R

= 2.7 MW, V

ISEL

= 270 kW, V

ISEL

= 2.0 V) I

BAT

= 2.0 V) I

BAT

Recommended Full Charge Current I Full−Charge Current in Constant Current (CC) Mode (R Full−Charge Current in Constant Current (CC) Mode (R End−of−Charge Threshold (R End−of−Charge Threshold (R

= 2.7 MW, V

ISEL

= 270 kW, V

ISEL

BAT BAT

= V = V

REG REG

Recharge Voltage Threshold V Thermal Foldback Limit (Junction Temperature) (Note 5) T

= 10 mA V

CHG

= 2.7 MW, V

ISEL

= 270 kW, V

ISEL

= 3.7 V) I

BAT

= 3.7 V) I

BAT

) I ) I

REG

PC FCHG FCHG FCHG

EOC EOC

RECH

LIM

4.158 4.200 4.242 V

OSCILLATOR

Oscillation Period (C

= 15 nF) T

TIME

OSC

STATUS FLAGS

CFLG Pin Recommended Maximum Operating V oltage V FAULT Pin Recommended Maximum Operating Voltage V CFLG Pin Sink Current (V FAULT Pin Sink Current (V

= 0.8 V) I

CFLG

= 0.8 V) I

FAULT

CFLG FAULT CFLG

FAULT

5. Guaranteed by design. Not tested in production.

2.8 − 6.5 V

3.0 3.4 3.95 V

2.0 2.4 2.8 V

−

600

−

mA mA

− − 3.0 mA

2.52 2.8 3.08 V

1.0 20 30 mA 30 50 65 mA 30 − 300 mA 30 45 58 mA

280 310 360 mA

1.0 4.0 11 mA 26 34 42 mA

3.80 4.03 4.155 V

− 100 − °C

2.4 3.0 3.6 ms

− − 6.5 V

5.0 − − mA

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NCP1835B

TYPICAL OPERATING CHARACTERISTICS

4.30

4.25

4.20

4.15

4.10

4.05

, REGULATED OUTPUT VOLTAGE (V)

REG

VCC = 5 V

4.00 0 0.06 0.12 0.18 0.24 0.3

, CHARGE CURRENT (A)

CHG

Figure 3. Regulated Output Voltage vs. Charge

Current

4.30

4.25

4.20

4.15

4.10

VCC = 5 V

4.05

floating

, REGULATED OUTPUT VOLTAGE (V)

REG

BAT

4.00

−50 −25 0 25 50 75 TA, AMBIENT TEMPERATURE (°C)

100 125

4.30

4.25

4.20

4.15

4.10

4.05

, REGULATED OUTPUT VOLTAGE (V)

4.00

REG

4.5 5 5.5 6 6.5

VCC, INPUT VOLTAGE (V)

Figure 4. Regulated Output Voltage (floating) vs.

Input Voltage

0.80

0.78

0.76

0.74

, ISEL VOLTAGE (V)

ISEL

0.72 V

= 3.7 V

BAT

0.70

4.5 5.0 5.5 6.0 6.5 VCC, INPUT VOLTAGE (V)

Figure 5. Regulated Output Voltage vs.

Temperature

3.00 V

floating

BAT

= 270 k

2.95

ISEL

V2P8

= 0

2.90

2.85

2.80

, V2P8 VOLTAGE (V)

2P8

2.75

2.70

4.5 5.0 5.5 6.0 6.5 VCC, INPUT VOLTAGE (V)

Figure 7. V2P8 Voltage vs. Input Voltage

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Figure 6. ISEL Voltage vs. Input Voltage

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