LM3537_13 Datasheet, PDF (2/33 Pages) Texas Instruments – 8-Channel WLED Driver with Four Integrated LDOs

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
1
2
3
4
5
A
HWEN PGND
C1-
C2+
C1+
B
SCL
PWM
SDA
C2-
VOUT
C
D2
D1
D
D3
D4
D8
D7/
INT
VIN_A
D5
D6
ALS
E
LDO2
GPO2
GPO1
SBIAS
VIN_B
F
LDO1
LDO4
GND
LDO3
VIN_C
Figure 1. 30–Bump DSBGA Package
Top View
2
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