SI9731_09 VISHAY [Vishay Siliconix], SI9731_09 Datasheet

SI9731_09

Manufacturer Part Number

SI9731_09

Description

uP Controlled Battery Charger for 1-Cell Li-ion or 1-Cell to 3-Cell NiCd/NiMH Batteries

Manufacturer

VISHAY [Vishay Siliconix]

Datasheet

1.SI9731_09.pdf (11 pages)

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DESCRIPTION

Si9731 is a chemistry independent battery charger designed

to pulse charge 1-cell to 3-cell NiCd/NiMH or 1-cell Li-ion

batteries. Battery charging is accomplished under direct

control from the system processor. An internal low R

MOSFET can be pulsed on and off at varying duty cycle by

the system processor to pulse charge the battery at high

charge current while minimizing heat dissipation. Provision is

also made to trickle charge a discharged battery until the

battery is charged to a high enough voltage to wake up the

processor so that the processor can take control of the

charging process. For charging Li-ion batteries, Si9731

includes a precision voltage reference and an error amplifier

for constant voltage (CV) charge mode. The Si9731 is

available in lead (Pb)-free TSSOP-16 package and is

classified over the industrial temperature range (- 40 °C to

+ 85 °C).

FUNCTIONAL BLOCK DIAGRAM

Document Number: 71321

S09-2249-Rev. C, 26-Oct-09

for 1-Cell Li-ion or 1-Cell to 3-Cell NiCd/NiMH Batteries

TRICKLECHARGEENABLE

FAST CHARGE

CHARGER

ON/OFF

MODE

GND

µP Controlled Battery Charger

DS(on)

Charge Control

FEATURES

APPLICATIONS

• Pulse charges 1-cell Li-ion or 1-cell to 3-cell

• Integrated MOSFETs with bi-directional

• PWM controlled fast charging mode

• Low current trickle charge mode

• Pin selectable 4.1 V or 4.2 V charge termination for Li-ion

• Constant voltage (CV) termination for Li-ion

• Input over-voltage detector with automatic shutdown

• External shutdown

• Under 1 µA reverse battery leakage current in shutdown

• Complete isolation from battery to external power supply

• Thermal shutdown

• Minimum number of external components

• ESD protection to 4 kV on charger input and battery

• TSSOP-16 package (1.2 mm maximum height)

• Halogen-free according to IEC 61249-2-21 definition

• Compliant to RoHS directive 2002/95/EC

• Cellular phone battery charger

• Personal digital assistants

NiCd/NiMH batteries

reverse current blocking in "OFF" mode

in shutdown

output

Fast

Charge

Trickle

Charge

4.1/4.2 V_TAP

Vishay Siliconix

BAT

www.vishay.com

Si9731

Related parts for SI9731_09

SI9731_09 Summary of contents

Page 1

Controlled Battery Charger for 1-Cell Li-ion or 1-Cell to 3-Cell NiCd/NiMH Batteries DESCRIPTION Si9731 is a chemistry independent battery charger designed to pulse charge 1-cell to 3-cell NiCd/NiMH or 1-cell Li-ion batteries. Battery charging is accomplished under direct control ...

Page 2

Si9731 Vishay Siliconix ABSOLUTE MAXIMUM RATINGS Parameter Voltages Referenced to GND = CHARGER, (CVMODE) (TRICKLECHARGEEN (4.1 V_TAP) (VBAT+) (CHARGERPOWER_ON) V (TRICKLE_VBAT (CHARGERPRESENTIN) (CHARGERPOWER_ONIN) Maximum Input Current ...

Page 3

SPECIFICATIONS Parameter Quiescent Current (Normal Mode) Quiescent Current (Shutdown Mode) Feedback Resistor Battery Leakage Current Q1 ON Resistance Q2 ON Resistance Resistance Over Voltage Detect Threshold Over Voltage Detect Threshold Hysteresis Output High Leakage CHARGERPRESENT and Current ...

Page 4

Si9731 Vishay Siliconix PIN CONFIGURATION CHARGERPRESENTIN CHARGERPOWER_ONIN V CHARGER ON/OFF TRICKLECHARGEEN CVMODE MAINCHARGEEN (N/C) ORDERING INFORMATION Part Number Si9731DQ Eval Kit Si9731DB PIN DESCRIPTION Pin Number Name 1 CHARGERPRESENTIN 2 CHARGERPOWER_ONIN Logic input for CHARGERPOWER_ON output V 3 CHARGER 4 ...

Page 5

TABLE 1: BATTERY CHARGING CONTROL LOGIC Nominal Voltage Values TRICKLE V CHARGEEN CVMODE CHARGER Not Present X Not Present Charge Over Voltage X V > 12.8 V CHARGER X LOW HIGH LOW HIGH Present a OK ...

Page 6

Si9731 Vishay Siliconix TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted 4.22 4.1 TAP Open 4.20 4.18 4.16 4.14 4.12 4.1 TAP to V 4.10 4. CHARGER V (CV Mode) vs. V BAT 2.75 2.70 2.65 2.60 2.55 ...

Page 7

BLOCK DIAGRAM AND TYPICAL APPLICATION CIRCUIT 1 CHARGERPRESENTIN 2 CHARGERPOWER_ONIN 4 ON/OFF 1 MΩ 100 kΩ CHARGER 2 2.2 μfd 12 TRICKLECHARGEEN 6 CVMODE 7 MAINCHARGEEN Document Number: 71321 S09-2249-Rev. C, 26-Oct-09 Latch ...

Page 8

Si9731 Vishay Siliconix DETAIL OPERATIONAL DESCRIPTION Si9731 is a chemistry independent battery charger designed for use with a system processor. For example, Si9731 can be integrated within a cellular phone whereby the fast charge and trickle (slow) charge modes can ...

Page 9

DETAIL OPERATIONAL DESCRIPTION 4.1 V TAP The Si9731’s internal feedback resistors are set to provide 4.2 V charge termination at V output if the 4.1 V BAT+ open circuit. Connecting the 4.1 V TAP Si9731 for 4.1 V charge termination ...

Page 10

TSSOP: 16-LEAD Symbols θ1 ECN: S-61920-Rev. D, 23-Oct-06 DWG: 5624 Document Number: 74417 23-Oct-06 DIMENSIONS IN MILLIMETERS Min Nom - 1.10 0.05 0.10 - 1.00 0.22 0.28 - ...

Page 11

... Parameters provided in datasheets and/or specifications may vary in different applications and performance may vary over time. All operating parameters, including typical parameters, must be validated for each customer application by the customer’s technical experts. Product specifications do not expand or otherwise modify Vishay’ ...

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