1 Features

1• 2.9-V to 18-V Input Voltage Range

• 3-A, 40-V Internal Power Switch

– Four 3-W LEDs From 5-V Input

– Eight 3-W LEDs From 12-V Input

• High-Efficiency Power Conversion: Up to 93%

• Frequency Set by External Resistor: 200 kHz to

2.2 MHz

• User-Defined Soft Start Into Full Load

• Programmable Overvoltage Protection

• Analog and Pure PWM Brightness Dimming

• 14-Pin HTSSOP Package With PowerPAD™

2 Applications

• Monitor Backlight

• 1-W or 3-W High-Brightness LED

3 Description

The TPS61500 is a monolithic switching regulator

with integrated 3-A, 40-V power switch. It is an ideal

driver for high brightness 1-W or 3-W LED. The

device has a wide input voltage range to support

application with input voltage from multi-cell batteries

or regulated 5-V or 12-V power rails.

The LED current is set with an external sensor

resistor R3, and the feedback voltage that is

regulated to 200 mV by current mode PWM (pulse

width modulation) control loop, as shown in Typical

Application Circuit. The device supports analog and

pure PWM dimming methods for LED brightness

control. Connecting a capacitor to the DIMC pin

configures the device to be used for analog dimming,

and the LED current varies proportional to the duty

cycle of an external PWM signal. Floating the DIMC

pin configures the device for pure PWM dimming with

the average LED current being the PWM signal's duty

cycle times a set LED current.

The device features a programmable soft-start

function to limit inrush current during start-up, and it

has other built-in protection features, such as pulseby-

pulse overcurrent limit, overvoltage protection, and

thermal shutdown. The TPS61500 is available in 14-

pin HTSSOP package with PowerPAD.