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.