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, 12-V power
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 the
typical application. 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 IC for pure PWM dimming with the average LED current being the
PWM signals duty cycle times a set LED current.
The device features a programmable soft-start function to limit inrush current during
start-up, and has built-in other protection features, such as pulse-by-pulse over current limit,
over voltage protection and thermal shutdown. The TPS61500 is available in 14-pin HTSSOP package
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