LM3632A Series

Single-chip backlight with Bias power and 1.5-A flash LED driver

Catalog

Single-chip backlight with Bias power and 1.5-A flash LED driver

Part	Voltage - Input [Max]	Voltage - Input [Min]	Current - Output / Channel	Utilized IC / Part	Supplied Contents	Outputs and Type	Outputs and Type	Topology	Supplier Device Package	Voltage - Output	Dimming	Number of Outputs	Operating Temperature [Max]	Operating Temperature [Min]	Frequency [Min]	Frequency [Max]	Internal Switch(s)	Package / Case	Applications	Mounting Type	Type	Voltage - Supply (Max)
Texas Instruments LM3632EVM	5 V	2.7 V	1.5 A	LM3632A	Board(s)	2	Non-Isolated
Texas Instruments LM3632AYFFR			1.5 A					Step-Up (Boost)	30-DSBGA	29 V	Analog	2	85 °C	-40 °C	500 kHz	1 MHz		30-UFBGA DSBGA	Backlight Camera Flash	Surface Mount	DC DC Regulator	5.5 V

Catalog

Single-chip backlight with Bias power and 1.5-A flash LED driver

Key Features

• Drives up to Two Strings of Typically Eight LEDsin SeriesIntegrated Backlight Boost with 29-V MaximumOutput VoltageTwo Low-Side Constant-Current LED Driverswith 25-mA Maximum Output CurrentBacklight Efficiency Up to 90%11-Bit Exponential or Linear DimmingExternal PWM Input for CABC BacklightOperationLCD Bias Efficiency > 85%Programmable Positive LCD bias, 4-V to 6-V, 50-mA Maximum Output CurrentProgrammable Negative LCD bias, –4-V to –6-V,50-mA Maximum Output Current1.5-A Flash LED BoostFlash Efficiency > 85%2.7-V to 5-V Input Voltage RangeDrives up to Two Strings of Typically Eight LEDsin SeriesIntegrated Backlight Boost with 29-V MaximumOutput VoltageTwo Low-Side Constant-Current LED Driverswith 25-mA Maximum Output CurrentBacklight Efficiency Up to 90%11-Bit Exponential or Linear DimmingExternal PWM Input for CABC BacklightOperationLCD Bias Efficiency > 85%Programmable Positive LCD bias, 4-V to 6-V, 50-mA Maximum Output CurrentProgrammable Negative LCD bias, –4-V to –6-V,50-mA Maximum Output Current1.5-A Flash LED BoostFlash Efficiency > 85%2.7-V to 5-V Input Voltage Range

Description

The LM3632A integrates the WLED drivers for both the backlight of the LCD panel and the camera flash along with the bias power for the LCD panel into one device. The device has all the safety features required in LED drivers with up to 90% efficiency and bias positive/negative power rails achieving 1.5% accuracy. Capable of driving up to 16 backlight LEDs, the device is ideal for small- to medium-size displays. A 1.5-A constant-current LED driver powered by a synchronous boost converter can be used for flash applications. The high-side flash current source allows for grounded cathode LED operation. A high level of integration and programmability allows the LM3632A to address a variety of applications without the need for hardware changes. The LM3632A integrates the WLED drivers for both the backlight of the LCD panel and the camera flash along with the bias power for the LCD panel into one device. The device has all the safety features required in LED drivers with up to 90% efficiency and bias positive/negative power rails achieving 1.5% accuracy. Capable of driving up to 16 backlight LEDs, the device is ideal for small- to medium-size displays. A 1.5-A constant-current LED driver powered by a synchronous boost converter can be used for flash applications. The high-side flash current source allows for grounded cathode LED operation. A high level of integration and programmability allows the LM3632A to address a variety of applications without the need for hardware changes.