ACP2728.pdf
No.13167
? Input Voltage Range: 2.7V to 5.5V
? 200mV Reference Voltage
? Integrated 2.7A Current Limit MOSFET
? Fixed 1.2MHz Switching Frequency
? PWM Brightness Control
? Under-Voltage Protection
? Low EMI and Improved PSRR
? Up to 93% Efficiency
? Built-In Soft-Start Function
? Thermal Shutdown
? TSOT-25 Tiny Package
The ACP2728 is a boost DC/DC converter that drives WLEDS with a 40V voltage rated switch MOSFET, thus it can drive single or parallel WLED strings for small to large size panel back-lighting. The default white LED current is set with the external sensor resistor, and the feedback voltage is regulated to 200mV, as shown in the typical application. During the operation, the WLED current can be controlled by a PWM signal applied to The EN pin, through which the duty cycle determines the feedback reference voltage. For Maximum protection, the device features integrated open protection that disables the ACP2728 to prevent the output voltage from exceeding the absolute maximum voltage ratings during open LED Conditions.
