General Description

MAP3621 is a single channel average-mode current

control buck controller for LED backlight application. It

does not require an additional dimming MOSFET and

utilizes constant off-time control and average current

control feedback without external loop compensation or

high-side current sensing.

MAP3621 features ±1% CS voltage accuracy and has

dedicated Independent analog dimming input up to

3.3V. It can be powered from 8.5V ~ 18V supply.

MAP3621 provides MOSFET DS short (FLT output),

sense resistor short protection, SCP and UVLO.

MAP3621 is available 14 leads SOIC with Halogenfree (fully RoHS compliant).

Features

 8.5V to 18V Input Voltage Range

 Average-Mode Current Control

 Mixed Programmable Constant Off-time

 Up to 3.3V Analog Dimming

 1% CS Voltage Accuracy

 Direct PWM Dimming Input

 Fault Output

- MOSFET Drain-Source Short

 Short Circuit Protection

 Sense Resistor Short Protection

 UVLO

 14 Leads SOIC Package with Halogen-free

Applications

 High Brightness white LED backlighting for LCD TVs

 General LED lighting applications