RY3740 Datasheet | RYCHIP

Features - 2.5V to 5.5V Input Voltage - Up to 40V Output Voltage - 1.2MHz Fixed Switching Frequency - 0.1/0.2/0.25/0.3/0.6V Feedback Voltage - Internal 1.6A Switch Current Limit - Support Analog and PWM Dimming Mode - Internal 40V Over Voltage Protection - Internal pensation - Thermal Shutdown - Driving Up to 10 White LEDS - Dimming with wide Frequency Range - Available in SOT23-5, DFN2×2-6 package Applications - Camera Flash White LED - Digital still cameras - PDA LED back light - LCD Bias Supply General Description The RY3740 series is a step-up converter designed for driving up to 10 white LEDs or up to 40V output voltage from a single cell Lithium Ion battery. The device features integrated overvoltage protection and feedback voltage is regulated to 100m V to 600m V. Low feedback voltage helps to reduces power loss and improves efficiency. Customers can choose different FB voltages according to their application. Optimized operation frequency can meet the requirement of small LC filters value and low operation current with high efficiency. Internal soft start function can reduce the inrush current. Both SOT23-5 and DFN2×2-6 package type provides the best solution for PCB space saving and total BOM cost. Typical Application Circuit L1=6.8µH D1 VOUT CIN=10µF SW n- WLED COUT=10µF Dimming CTRL GND R1 Typical White LED Application Circuit L1=6.8µH D1 CIN=10µF R2...