• 2.7V to 5.5V Input Voltage Range

• 200mV Reference Feedback Voltage

• 1.2MHz Fixed Frequency

• Internal 38V Open LED Protection

• Integrated 40V,1.5A MOSFET

• 10~100KHz PWM Dimming Control Range

• Internal Soft Start

• Under-Voltage Protection

• Over Thermal Shutdown

• Low EMI and Improved PSRR

• TSOT26 Package Available

The ACP2766 is a step-up DC-DC converter which

operating as current source to drive white LEDs. The

light intensity of LEDs is proportional to the current

passing through them. The default white LEDs current is

set with the external resistor, and the feedback voltage

reference is set to 200mV. During the operation, the

LED current can be pulsed by adding a PWM signal to

the chip, through which the duty cycle changes the

feedback reference voltage. With fixed frequency of

1.2MHz, ACP2766 is allowed using tiny inductor and

capacitors to minimize the footprint. For maximum

protection, the chip features open LED protection

function that can disable the chip to prevent the output

voltage from exceeding voltage rating during open LED

conditions.