AW9961 Datasheet | AWINIC

FEATURES GENERAL DESCRIPTION - 2.7 to 5.5V Input Voltage Range - 38V Over-voltage Protection for up to 10 LEDs in Series - Innovative CDC Output Drive Technology, Significantly Improve EMI Performance - 200m V Reference Voltage - Flexible Digital and PWM White LED Brightness Control - Support EMI performance programmable under 1-wire/PWM mode - Minimum PWM Dimming Duty Cycle: 1% - 600k Hz Switching Frequency - Over-current and Over-temperature Protection - Built-in Soft-start Limits Inrush Current - Ultra Small 2mm- 2mm TDFN-6L package APPLICATIONS - Mobile Phones - Portable Media Players - GPS Receivers The AW9961 is a white LED driver with integrated boost converter. With an internal 40V switch FET, the AW9961 drives up a string of up to 10 LEDs in series. The boost converter runs at 600k Hz fixed switching frequency to reduce output ripple, improve conversion efficiency, and allows for the use of small external ponents. The default white LED current is set with the external sense resistor RSET, and the feedback voltage is regulated to 200m V, as shown in the typical application. During the operation, the LED current can be controlled by using the 1-wire digital interface through the CTRL pin. Alternately, a pulse width modulation (PWM) signal can be applied to the CTRL pin through which the duty cycle determines the feedback reference voltage. In either digital or PWM mode, the AW9961 does not generate audible noises on the output capacitor. For maximum protection, the device features integrated open LED over-voltage protection that disables the AW9961 to prevent the output from exceeding the absolute maximum ratings during open LED conditions. AW9961 sets a built-in EMI performance register, which can be configured under either 1-wire or PWM mode. TYPICAL APPLICATION CIRCUIT L Schottky Diode 22μH CIN1 10μF CIN2- optional 100n F 6 VIN COUT2- optional COUT1 D1 SW 33p F/50V 1μF/50V D2 D3 D4 AW9961DNR...