LM3532 datasheet(9/52 Pages) TI2

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High Voltage Current

Sinks

LED1

LED2

SDA

SCL

I2C Interface

Overvoltage

Protection (40 V)

1-A Current Limit

Boost Converter

(0.25-

Ÿ NMOS)

LED3

500-kHz Switching

Frequency

Programmable Input

128 Internal gain

setting resistors

ALS1

ALS2

ALS Processing

1. 8-bit ADC

2. Averaging

3. ALS Algorithms

Output Configuration

1. I2C Control

2. I2C x PWM Control

3. PWM Only Control

4. ALS Control

LED Current Ramping

8 µs/step

1 ms/step

2 ms/step

4 ms/step

8 ms/step

16 ms/step

33 ms/step

66 ms/step

Backlight LED Control

1. 5-bit Full Scale

Current Select

2. 8-bit brightness

adjustment

3. Linear/Exponential

Dimming

400-mV

Headroom

Voltage

PWM2

Internal Low Pass

Filter

PWM1

Internal Low Pass

Filter

OVP

Reference, Logic,

Oscillator

HWEN

GND

INT

Thermal Shutdown

(140°C)

Power

On Reset

(1.8 V)

LM3532

www.ti.com

SNVS653E – JULY 2011 – REVISED AUGUST 2015

7 Detailed Description

7.1 Overview

The LM3532 backlight driver consists of three 30-mA current sinks, a dual input ambient light sensor interface,

and a dual input PWM control. The LED current can be controlled via either the I2C bus, the PWM input, the

ambient light sensor interface, or a combination of each. The programmable options via I2C allow for the three

current sinks to be controlled independently or be controlled by a single source.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 40-V Boost Converter

The LM3532 contains a 40-V maximum output voltage, asynchronous boost converter with an integrated 250-m

Ω

switch, and three low-side current sinks. Each low-side current sink is independently programmable from 0 to 30

mA.

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