General Description

The APW7136A/B/C is a current-mode and fixed frequency boost converter with an integrated N-FET to drive up to 8 white LEDs in series.

The series connection allows the LED current to be identical for uniform brightness. Its low on-resistance of N-FET and feedback voltage reduce power loss and achieves high efficiency. Fast 1MHz current-mode PWM operation is available for input and output capacitors and a small inductor while minimizing ripple on the input supply. The OVP pin monitors the output voltage and stop switching if exceeds the over-voltage threshold. An internal soft-start circuit eliminates the inrush current during start-up.

Features

• Wide Input Voltage from 2.7V to 6V

• 0.25V Reference Voltage

• Fixed 1MHz Switching Frequency

• High Efficiency up to 87

• 100Hz to 100KHz PWM brightness control frequency

• Open-LED Protection

• Under Voltage Lockout Protection

• Over Temperature Protection

• <1μA Quiescent Current during Shutdown

• SOT-23-6 Package

• Lead Free Available (RoHS Compliant)

Applications

• White LED Display Backlighting

• Cell Phone and Smart Phone

• PDA, PMP, MP3

• Digital Camera