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LM3530
SNVS606L –JUNE 2009–REVISED DECEMBER 2014
LM3530 High-Efficiency White-LED Driver with Programmable Ambient Light Sensing
Capability and I2C-Compatible Interface
1 Features
3 Description
The LM3530 current mode boost converter supplies
the power and controls the current in up to 11 series
white LEDs. The 839-mA current limit and 2.7-V to
5.5-V input voltage range make the device a versatile
backlight power source ideal for operation in portable
applications.
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Drives up to 11 LEDs in series
1000:1 Dimming Ratio
90% Efficient
Programmable Dual Ambient Light Sensor Inputs
with Internal ALS Voltage Setting Resistors
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I2C Programmable Logarithmic or Linear
Brightness Control
The LED current is adjustable from 0 mA to 29.5 mA
via an I2C-compatible interface. The 127 different
current steps and 8 different maximum LED current
levels give over 1000 programmable LED current
levels. Additionally, PWM brightness control is
possible through an external logic level input.
External PWM Input for Simple Brightness
Adjustment
True Shutdown Isolation for LEDs and Ambient
Light Sensors
The device also features two Ambient Light Sensor
inputs. These are designed to monitor analog output
ambient light sensors and provide programmable
adjustment of the LED current with changes in
ambient light. Each ambient light sensor input has
independently programmable internal voltage setting
resistors which can be made high impedance to
reduce power during shutdown. The 500-kHz
switching frequency allows for high converter
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Internal Soft-Start Limits Inrush Current
Wide 2.7-V to 5.5-V Input Voltage Range
40-V and 25-V Overvoltage Protection Options
500-kHz Fixed Frequency Operation
839-mA Peak Current Limit
2 Applications
efficiency over
a
wide output voltage range
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Smartphone LCD Backlighting
accommodating from 2 to 11 series LEDs. Finally, the
support of Content Adjusted Backlighting maximizes
battery life while maintaining display image quality.
Personal Navigation LCD Backlighting
2 to 11 Series White-LED Backlit Display Power
Source
The LM3530 operates over the −40°C to 85°C
temperature range.
space
Device Information(1)
PART NUMBER
LM3530
PACKAGE
BODY SIZE (MAX)
DSBGA (12)
1.64 mm x 1.24 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
L
D1
Up to 40V
2.7V to 5.5V
C
OUT
SW
V
IN
LOGIC
C
IN
10 k:
10 k: 10 k:
10 k:
LM3530
SCL
SDA
OVP
HWEN
INT
PWM
ILED
VIN
VIN
Ambient Light
Sensor
Ambient Light
Sensor
ALS1
ALS2
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.