IS31BL3506B

IS31BL3506B 1.0MHZ BOOST CONVERTER WITH 35V INTERNAL MOSFET SWITCH April 2013 GENERAL DESCRIPTION IS31BL3506B is a boost converter featuring an integrated MOSFET switch designed for driving series strings of LED or other device. Input operating voltage range is 2.7V~5.5V. The device regulates the LED load current is set using an external, low value sensing resistor. The device adjusts the PWM duty cycle of the switch to maintain the voltage at the FB pin at a value of 0.2V. The IS31BL3506B operates at a constant switching frequency of 1.0MHz to allow for small component size. IS31BL3506B features an over voltage shutdown pin which prevents the output voltage from exceeding 35V (typ.) in the case of an open circuit condition. The device is offered in a tiny TSOT-23-6 and SOT-23-6 package and a temperature rating from -40°C ~ +85°C. FEATURES  Supply voltage: 2.7V~5.5V  Built-in soft start  Drive series strings of 8 LEDs  PWM or DC voltage dimming  Frequency of PWM is 500Hz ~ 500kHz  1.0MHz high speed switching frequency  200mV feedback voltage  Integrated high power MOSFET  Over voltage protection  -40°C ~ +85°C working temperature range  TSOT-23-6 and SOT-23-6 package APPLICATIONS  Small LCD Backlights  Notebook PC  GPS TYPICAL APPLICATION CIRCUIT Figure 1 Constant current white LED driver using PWM at the EN pin to control intensity Note 1: COUT must be rated for 50V. Smaller values of output capacitance will cause the LED current ripple to increase. Note 2...