PAM2804

Document number: DS36403 Rev. 3 - 2

1 of 10

www.diodes.com

September 2015

© Diodes Incorporated

PAM2804

1A STEP-DOWN CONSTANT CURRENT, HIGH EFFICIENCY LED DRIVER

Description

The PAM2804 is a step-down constant current LED driver. When the

input voltage is down to lower than LED forward voltage, then

PAM2804 goes into LDO mode.

The PAM2804 supports a range of input voltages from 2.5V to 6.0V,

allowing the use of a single Li+/Li-polymer cell, 3AA or 4AA cell, USB,

and other standard power sources.

The FB voltage is only 0.1V to achieve high efficiency.

PAM2804 employs internal power switch and synchronous rectifier to

minimize external part count and realize high efficiency.

During shutdown, the input is disconnected from the output and the

shutdown current is less than 1µA. Other key features include

undervoltage lockout to prevent deep battery discharge of the Li+

battery.

Features



Efficiency up to 93%



180µA(typ) Quiescent Current



Output Current: Up to 1A



Internal Synchronous Rectifier



1.5MHz Switching Frequency



Soft-Start



Undervoltage Lockout



Short LED Protection



Open LED Protection



Thermal Shutdown



5-Pin Small TSOT25 Packages



Pb-Free Package

Pin Assignments

Applications



3AA or 4AA Batteries Powered Flashlight



1 Cell Li-Ion Battery Powered Flashlight

Typical Applications Circuit

Top View

TSOT25