5

4

3

2

1

A

B

C

D

E

F

LDO1

LDO2

VOUT

VIN_A

ALS

C2-

D7/

INT

D6

LDO3

GND

SDA

D8

C1-

D5

PWM

D1

D4

HWEN

SCL

D3

D2

PGND

LDO4

C2+

C1+

SBIAS

GPO1

GPO2

VIN_B

VIN_C

LM3537

SNVS634B – JUNE 2011 – REVISED MAY 2013

www.ti.com

DESCRIPTION (CONTINUED)

I2C-compatible control allows full configurability of the backlighting function. The LM3537 provides multi-zone

Ambient Light Sensing allowing autonomous backlight intensity control in the event of changing ambient light

conditions. A PWM input is also provided to give the user a means to adjust the backlight intensity dynamically

based upon the content of the display.

Four integrated LDOs are fully configurable through I2C capable of addressing point-of-load regulation needs for

functions such as integrated camera modules. The LDOs can be powered from main battery source, or by a fixed

output voltage of an external buck converter (post regulation) leading to higher conversion efficiency.

The LM3537 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain

of 3/2 or in Pass Mode. The proper gain for maintaining current regulation is chosen, based on LED forward

voltage, so that efficiency is maximized over the input voltage range.

LM3537 is offered in a tiny 30-bump DSBGA package.

Connection Diagram

Figure 1. 30–Bump DSBGA Package

Top View

2

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