bq24765

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SLUS999 – NOVEMBER 2009

ORDERING NUMBER

PART NUMBER

PACKAGE

QUANTITY

(Tape and Reel)

bq24765RUVR

3000

bq24765

RUV 34 Pin, 3. 5mm x 7mm QFN

bq24765RUVT

250

(1)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com.

PACKAGE THERMAL DATA

(1)

POWER RATING

DERATING FACTOR ABOVE

PACKAGE

5.3°C/W

38.5°C/W

2.60 W

0.026 W/°C

(1)

This data is based on using the JEDEC High-K board and the exposed die pad is connected to a copper pad on the board. This is

connected to the ground plane by a 2x3 via matrix

(2)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

Web site at www.ti.com.

Table 1. Pin Functions – 34-Pin QFN

PIN

FUNCTION

NO.

NAME

1

PGND

Power ground. Connection to source of integrated low-side power MOSFET. On PCB layout, connect to ground

connection of input and output capacitors of the charger. Only connect to AGND through the power-pad underneath the

IC.

2

DCINP

High current input for IC power positive supply, and connection to drain of high-side power MOSFET. Place two 10uF

ceramic capacitors from DCINP to PGND pin close to the IC.

3

DCINP

High current input for IC power positive supply, and connection to drain of high-side power MOSFET. Place two 10uF

ceramic capacitors from DCINP to PGND pin close to the IC.

4

DCINP

High current input for IC power positive supply, and connection to drain of high-side power MOSFET. Place two 10uF

ceramic capacitors from DCINP to PGND pin close to the IC.

5

CSSN

Adapter current sense resistor, negative input. An optional 0.1-uF ceramic capacitor is placed from CSSN pin to AGND

for common-mode filtering. A 0.1-uF ceramic capacitor is placed from CSSN to CSSP to provide differential-mode

filtering.

6

CSSP

Adapter current sense resistor, positive input. A 0.1-uF ceramic capacitor is placed from CSSP pin to AGND for

common-mode filtering. A 0.1-uF ceramic capacitor is placed from CSSN to CSSP to provide differential-mode filtering.

7

VREF

3.3V regulated voltage output. Place a 1uF ceramic capacitor from VREF to AGND pin close to the IC. This voltage

could be used for programming the ICREF threshold. VREF can directly connect to VDDSMB as SMBus supply, or

serve as pull up supply rail for CE, ACOK and ICOUT.

8

ICREF

Low power voltage set input. Connect a resistor divider from VREF to ICREF, and AGND to program the reference for

the LOPWR comparator. The ICREF pin voltage is compared to the VICM pin voltage and the logic output is given on

the ICOUT open-drain pin. Connecting a positive feedback resistor from ICREF pin to ICOUT pin programs the

hysteresis.

9

ACIN

Adapter detected voltage set input. Program the adapter detect threshold by connecting a resistor divider from adapter

input to ACIN pin to AGND pin. ACOK open-drain output is pulled high and charge is allowed when ACIN pin voltage is

greater than 2.4V. VREF regulator and VICM current sense amplifier are active when ACIN pin voltage is greater than

10

EAO

Error Amplifier Output for compensation. Connect the feedback compensation components from EAO to EAI. Typically,

a capacitor in parallel with a series resistor and capacitor. This node is internally compared to the PWM saw-tooth

oscillator signal.

11

EAI

Error Amplifier Input for compensation. Connect the feedback compensation components from EAI to EAO. Connect the

input compensation from FBO to EAI.

12

FBO

Feedback Output for compensation. Connect the input compensation from FBO to EAI. Typically, a resistor in parallel

with a series resistor and capacitor.

13

CE

Charge enable active-high logic input. HI enables charge. LO disables charge. Pull up CE using 10kOhm resistor or

connect directly to VREF to enable charger.

14

VICM

Adapter current sense amplifier output. VICM voltage is 20 times the differential voltage across CSSP-CSSN. Place a

100pF (max) or less ceramic decoupling capacitor from VICM to AGND.

Copyright © 2009, Texas Instruments Incorporated

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