TPS61061YZFR

恒流LED驱动器，具有数字和PWM亮度控制 CONSTANT CURRENT LED DRIVER WITH DIGITAL AND PWM BRIGHTNESS CONTROL

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.

Features

• 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

Applications

• White LED Drivers

• Cellular Phones

• PDAs, Pocket PCs, and Smart Phones

• Digital Still Cameras

• Handheld Devices