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VOUT up to 40V
V
IN
IN SW OVP
ILED1
ILED2
ILED3
PGND
ALS2
ALS1
INT
Ambient Light
Sensor 1
Ambient Light
Sensor 2
V
ALS
V
IN
HWEN
SDA
SCL
LM3532
COUT
CIN
L D1
PWM1
PWM2
T0
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LM3532
SNVS653E –JULY 2011–REVISED AUGUST 2015
LM3532 High-Efficiency White LED Driver With Programmable Ambient Light Sensing
Capability and I
2
C-Compatible Interface
1 Features 3 Description
The LM3532 is a 500-kHz fixed frequency
1
• Drives up to 3 Parallel High-Voltage LED Strings
asynchronous boost converter which provides the
at 40 V Each With up to 90% Efficiency
power for 3 high-voltage, low-side current sinks. The
• 0.4% Typical Current Matching Between Strings
device is programmable over an I
2
C-compatible
• 256 Level Logarithmic and Linear Brightness
interface and has independent current control for all
three channels. The adaptive current regulation
Control With 14-Bit Equivalent Dimming
method allows for different LED currents in each
• I
2
C-Compatible Interface
current sink thus allowing for a wide variety of
• Direct Read Back of Ambient Light Sensor Via
backlight and keypad applications.
8-bit ADC
The main features of the LM3532 include dual
• Programmable Dual Ambient Light Sensor Inputs
ambient light sensor inputs each with 32 internal
With Internal Sensor Gain Selection
voltage setting resistors, 8-bit logarithmic and linear
• Dual External PWM Inputs for LED Brightness
brightness control, dual external PWM brightness
control inputs, and up to 1000:1 dimming ratio with
Adjustment
programmable fade in and fade out settings.
• Independent Current String Brightness Control
The LM3532 is available in a 16-pin, 0.4-mm pitch
• Programmable LED Current Ramp Rates
thin DSBGA package. The device operates over a
• 40-V Overvoltage Protection
2.7-V to 5.5-V input voltage range and the −40°C to
• 1-A Typical Current Limit
+85°C temperature range.
2 Applications
Device Information
(1)
PART NUMBER PACKAGE BODY SIZE (MAX)
• Power Source for White LED Backlit LCD Displays
LM3532 DSBGA (16) 1.87 mm x 1.77 mm
• Programmable Keypad Backlight
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
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.
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