LM27964SQ-I datasheet(2/13 Pages) NSC

Part #	LM27964SQ-I

Description	White LED Driver System with I2C Compatible Brightness Control

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Manufacturer	NSC [National Semiconductor (TI)]

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Connection Diagram

24 Pin Quad LLP Package

NS Package Number SQA24A

20138102

Pin Descriptions

Pin #s

Pin Names

Pin Descriptions

24

V

IN

Input voltage. Input range: 2.7V to 5.5V.

23

P

OUT

Charge Pump Output Voltage

19, 22 (C1)

20, 21 (C2)

C1, C2

Flying Capacitor Connections

13, 14, 15, 16

D4A, D3A, D2A,

D1A

LED Drivers - GroupA

4, 5

D1B, D2B

LED Drivers - GroupB

6

DKEY

LED Driver - KEYPAD

17

I

SETA

Placing a resistor (R

SETA) between this pin and GND sets the full-scale LED

current for Group A LEDs. LED Current = 200 x (1.25V ÷ R

SETA)

3I

SETB

Placing a resistor (R

SETB) between this pin and GND sets the full-scale LED

current for Group B LEDs. LED Current = 200 x (1.25V ÷ R

SETB)

12

I

SETK

Placing a resistor (R

SETK) between this pin and GND sets the total LED

current for the KEYPAD LEDs. Keypad LED Current = 800 x (1.25V ÷ R

SETK)

1

SCL

Serial Clock Pin

2

SDIO

Serial Data Input/Output Pin

7

VIO

Serial Bus Voltage Level Pin

9, 10, 18, DAP

GND

Ground

8, 11

NC

No Connect

Ordering Information

Order Information

Current Source

PWM Frequency

Package

Supplied As

LM27964SQ-I

10kHz.

SQA24 LLP

1000 Units, Tape & Reel

LM27964SQX-I

4500 Units, Tape & Reel

LM27964SQ-A

23kHz.

SQA24 LLP

1000 Units, Tape & Reel

LM27964SQX-A

4500 Units, Tape & Reel

www.national.com

2

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LM27964SQ-I Datasheet(PDF) 2 Page - National Semiconductor (TI)

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