1 Features

1• LED Driver With Integrated Overvoltage and

Short-Circuit Protection

• 2.7-V to 6-V Input Voltage Range

• 500-mV or 250-mV Feedback Voltage

• TPS61060 Powers up to 3 LEDs

• TPS61061 Powers up to 4 LEDs

• TPS61062 Powers up to 5 LEDs

• PWM Brightness Control on Enable

• Digital Brightness Control on ILED

• 1-MHz Fixed Switching Frequency

• 400-mA Internal Power MOSFET Switch

• LEDs Disconnected During Shutdown

• Operates With Small-Output Capacitors

Down to 220 nF

• Up to 80% Efficiency

• 8-Pin NanoFree™ Package (Chipscale, CSP)

• 3-mm × 3-mm QFN Package

2 Applications

• White LED Drivers

• Cellular Phones

• PDAs, Pocket PCs, and Smart Phones

• Digital Still Cameras

• Handheld Devices

3 Description

The TPS6106x is a high-frequency, synchronous

boost converter with constant current output to drive

up to five white LEDs. For maximum safety, the

device features integrated overvoltage and an

advanced short-circuit protection when the output is

shorted to ground. The device operates with 1-MHz

fixed switching frequency to allow for the use of small external components and to simplify possible EMI

problems. The device comes with three different

overvoltage protection thresholds (14 V, 18 V, and 23

V) to allow inexpensive and small-output capacitors with lower voltage ratings. The LED current is initially

set with the external sense resistor Rs, and the

feedback voltage is regulated to 500 mV or 250 mV,

depending on the configuration of the ILED pin.

Digital brightness control is implemented by applying a simple digital signal to the ILED pin. Alternatively, a

PWM signal up to 1 kHz can be applied to the enable

pin to control the brightness of the LED. During

shutdown, the output is disconnected from the input

to avoid leakage current through the LEDs.