LM3630A_15 Datasheet, PDF (1/51 Pages) Texas Instruments – High-Efficiency Dual-String White LED Driver

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LM3630A
SNVS974B – APRIL 2013 – REVISED OCTOBER 2015
LM3630A High-Efficiency Dual-String White LED Driver
1 Features
•1 Drives up to 2 Strings of 10 Series LEDs
• Wide 2.3-V to 5.5-V Input Voltage Range
• 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
• Adaptive Headroom
• Programmable 16-V/24-V/32-V/40-V Overvoltage
Protection
• Selectable Boost Frequency of 500 kHz or 1 MHz
with Optionally Additional Offset
• Low Profile 12-Pin DSBGA Package
• Solution Size 32 mm²
2 Applications
• Smart-Phone LCD Backlighting
• LCD and Keypad Lighting
3 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 1 MHz
to allow the use of tiny low-profile inductors. A setting
for a 10% offset of these frequencies is available.
Overvoltage protection is programmable at 16 V,
24 V, 32 V, or 40 V to accommodate a wide variety of
LED configurations and Schottky diode/output
capacitor combinations.
The device operates over a 2.3-V to 5.5-V operating
voltage range and –40°C to +85°C ambient
temperature range. The LM3630A is available in an
ultra-small 12-bump DSBGA package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM3630A
DSBGA (12)
1.94 mm × 1.42 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
VIN
CIN
L
D1
VOUT up to 40V
COUT
IN
SW
OVP
SDA
SCL
AP
INTN
LM3630A LED1
HWEN
PWM
LED2
SEL
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.