LM3630A Datasheet, PDF (1/45 Pages) Texas Instruments – LM3630A High-Efficiency Dual-String White LED Driver

LM3630A
www.ti.com
SNVS974 – APRIL 2013
LM3630A High-Efficiency Dual-String White LED Driver
Check for Samples: LM3630A
FEATURES
1
•2 Drives up to 2 strings of 10 series LEDs
• Up to 87% efficient
• 8-bit I²C-Compatible Programmable
Exponential or Linear Brightness Control
• PWM Brightness Control for CABC Operation
• Independent Current Control per String
• True Shutdown Isolation for LEDs
• Internal Soft-Start Limits Inrush Current
• Wide 2.3V to 5.5V Input Voltage Range
• Adaptive Headroom
• Programmable 16V/24V/32V/40V Over-Voltage
Protection
• Selectable Boost Frequency of 500 kHz or
1MHz with optionally additional offset
• Low Profile 12-Bump DSBGA Package
• Solution Size 32mm²
APPLICATIONS
• Smart-Phone LCD Backlighting
• LCD + Keypad Lighting
DESCRIPTION
The LM3630A is a current mode boost converter
which supplies the power and controls the current in
up to two strings of 10 LEDs per string. Programming
is done over an I²C-compatible interface. The
maximum LED current is adjustable from 5 mA to
28.5 mA. At any given maximum LED current the
LED brightness is further adjusted with 256
exponential or linear dimming steps. Additionally,
pulsed width modulation ("PWM") brightness control
can be enabled allowing for LED current adjustment
by a logic level PWM signal.
The boost switching frequency is programmable at
500 kHz for low switching loss performance or 1MHz
to allow the use of tiny low profile inductors. A setting
for a 10% offset of these frequencies is available.
Over-voltage protection is programmable at 16V,
24V, 32V, or 40V to accommodate a wide variety of
LED configurations and Schottky Diode/Output
Capacitor combinations.
The device operates over the 2.3V to 5.5V operating
voltage range and -40°C to +85°C ambient
temperature range. The LM3630A is available in an
ultra-small 12-bump DSBGA package.
TYPICAL APPLICATION CIRCUIT
VIN
CIN
L
D1
VOUT up to 40V
COUT
IN
SW
OVP
SDA
SCL
AP
INTN
LM3630A LED1
HWEN
PWM
LED2
SEL
GND
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated