Diodes PAM2804 User Manual
Pam2804, Description, Features
PAM2804
Document number: DSxxxxx Rev. 2 - 0
1 of 10
January 2013
© Diodes Incorporated
PAM2804
A Product Line of
Diodes Incorporated
1A STEP-DOWN CONSTANT CURRENT, HIGH EFFICIENCY LED DRIVER
Description
The PAM2804 is a step-down constant current LED driver. When the
input voltage down to lower than LED forward voltage, then PAM2804
run 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 employ 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 under-
voltage 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
• Under-Voltage
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
I
LED
= 0.1/R
S
Top View
TSOT25