LM3532TME-40A/NOPB National Semiconductor, LM3532TME-40A/NOPB Datasheet

LM3532TME-40A/NOPB

Manufacturer Part Number

LM3532TME-40A/NOPB

Description

Hi Eff White LED W/light Sense

Manufacturer

National Semiconductor

Datasheet

1.LM3532TMX-40ANOPB.pdf (44 pages)

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High Efficiency White LED Driver with Programmable

Ambient Light Sensing Capability and I

Interface

General Description

The LM3532 is a 500 kHz fixed frequency asynchronous

boost converter which provides the power for 3 high-voltage,

low-side current sinks. The device is programmable over an

for all three channels. The adaptive current regulation method

allows for different LED currents in each current sink thus al-

lowing for a wide variety of backlight + keypad applications.

The main features of the LM3532 include dual ambient light

sensor inputs each with 32 internal voltage setting resistors,

8-bit logarithmic and linear brightness control, dual external

PWM brightness control inputs, and up to 1000:1 dimming

ratio with programmable fade in and fade out settings.

The LM3532 is available in a 16-bump, 0.4mm pitch thin micro

SMD (1.745 mm x 1.845 mm x 0.6 mm). The device operates

over a 2.7V to 5.5V input voltage range and the −40°C to +85°

C temperature range.

Typical Application Circuit

C-compatible interface and has independent current control

301154

LM3532

Features

■

Applications

■

Drives up to 3 Parallel High-Voltage LED Strings at 40V

each with up to 90% efficiency

0.4% Typical Current Matching Between Strings

256 Level Logarithmic and Linear Brightness Control with

14-Bit Equivalent Dimming

Direct Read Back of Ambient Light Sensor via 8-bit ADC

Programmable Dual Ambient Light Sensor Inputs with

Internal Sensor Gain Selection

Dual External PWM Inputs for LED Brightness Adjustment

Independent Current String Brightness Control

Programmable LED Current Ramp Rates

40V Over-Voltage Protection

1A Typical Current Limit

Power Source for White LED Backlit LCD Displays

Programmable Keypad Backlight

C-compatible Interface

C-Compatible

August 9, 2011

www.national.com

301154100

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