G2621 台湾致新代理商 GMT DC-DC系列 LED背光驱动器
High Efficiency, Constant Current40V White-LEDs Driver

Description
The  G2621  step-up  converter  drives  white  LEDs  with  a  constant  current  to  provide  backlight  in  cell  phones,  PDAs,  and  other  hand-held  devices.  It  features  allowing  series  connection  of  the  white  LEDs  so  that  the  LED  currents  are  identical  for  uniform  brightness.  An  enable  input    can    be    pulsed    repeatedly    to    adjust    LED’s    brightness.  The  fast  1.0MHz  current-mode  PWM  control  allows  for  smaller  capacitor  and  inductor.  Fault  condition  protection  uses  cycle-by-cycle  current  limiting  to  sense  maximum    inductor    current,    thermal    protection    and    over-voltage protection. Also included soft-start eliminates inrush  current  during  start-up.  The  0.2V  low  reference  voltage     minimized     the     power     loss     across     the  current-setting resistor.

The G2621 is available in SOT-23-6 packages.

Feature „
Operating Voltage: 2.5V to 5.5V.   
„High Operating Frequency: 1MHz   „
High Output Voltage: Up to 40V(Typ.) „
Digital Dimming Control. „
Built-in Cycle-by Cycle Current-Limiting.
„Built-in Soft-Start Function. „
0.2V Low Reference Voltage „
Thermal Overload Protection „
SOT-23-6 Package

Application
„GPS Navigation System „
Compact Back Light Module „
Constant Current Source
„LED Module

Ordering Information

Note: TB:  SOT23-6 1: Bonding Code U: Tape & Reel

Pin Configuration                                                                                                         Typical Application Circuit

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