LM3537

VIN = 2.7 to 5.5V

CIN_A

1 PF

C2

1 PF

C1

1 PF

C1+ C1- C2+ C2-

COUT

1 PF

VOUT

MCU

SCL

SDA

HWEN

PWM

1 PF

CLDO1

1 PF

CLDO2

1 PF

CLDO3

1 PF

CLDO4

ALS

D1

D2

D3

D4

D5

D6

D7/

INT

D8

CIN_C

2.2 PF

VIN_C

VIN_A

GNDs

LDO2

LDO1

LDO3

LDO4

CIN_B

100 nF

VIN_B

SBIAS

AMBIENT

LIGHT

SENSOR

CSEN

1 PF

GPO1

GPO2

+

-

LM3537

www.ti.com

SNVS634B – JUNE 2011 – REVISED MAY 2013

LM3537 8-Channel WLED Driver with Four Integrated LDOs

Check for Samples: LM3537

1

FEATURES

2

Lighting:

•

LDO Input Voltage = 1.8V to VIN_A

•

Overload Protection

•

8-channel Backlight Capability

Combined Common Features:

•

Internal ALS Engine; PWM Input to Support

CABC

•

Wide Input Voltage Range: 2.7V to 5.5V

•

Built-In Power Supply and Gain Control for

•

I2C-Compatible Serial Interface

Ambient Light Sensor

•

2 General-Purpose Outputs

•

Up to 90% Efficiency

APPLICATIONS

•

Adaptive Charge Pump with 1x and 1.5x

Ggains for Maximum Efficiency

•

Smartphone Lighting

•

128 Dimming Steps for Group A, Exponential

•

MP3 Players, Gaming Devices

or Linear Dimming Selectable by Register

•

Digital Cameras

Setup

•

8 Linear Dimming States for Group B

DESCRIPTION

LDOs:

The LM3537 is a highly integrated LED driver

capable of driving 8 LEDs in parallel for single display

•

4 Programmable LDOs (300 mA/150 mA Output

backlighting applications. Independent LED control

Currents)

allows for a subset of the main display LEDs to be

•

Default Startup Voltage States

selected for partial illumination applications.

•

Low Dropout Voltage: 100 mV typ. at 150 mA

Load Current

Typical Application Circuit

1

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2011–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.