Diodes PAM2803 - Manual

PAM2803
Document number: DSxxxxx Rev. 1 - 1
1 of 9
www.diodes.com
July 2013
© Diodes Incorporated
PAM2803
A Product Line of
Diodes Incorporated
3W HIGH POWER WHITE LED DRIVER
Description
The PAM2803 is a set-up DC-DC converter that delivers a regulated
output current. The device switches at a 1.0MHz constant frequency,
allowing for the use of small value external inductor and ceramic
capacitors.
The PAM2803 is targeted to be used for driving loads up to 1A from a
two-cell alkaline battery. The LED current can be programmed by the
external current sense resistor, R
S
, connected between the feedback
pin (FB) and ground. A low 95mV feedback voltage reduces the
power loss in the Rs for better efficiency. With its internal 2A, 100m Ω
NMOS switch, the device can provide high efficiency even at heavy
load. During the shutdown mode, the feedback resistor R
S
and the
load are completely disconnected and the current consumption is
reduced to less than 1µA.
The PAM2803 is available in the 6-lead TSOT26 package.
Features
 LED Power Efficiency: up to 90%

Current Accuracy: 5%(V
IN
= 3.6V to 1.8V @V
F
= 3.7V)

Low Start-Up Voltage: 0.9V (I LED = 270mA)
 Low Hold Voltage: 0.75 (I
LED
= 200mA)
 1MHz Switching Frequency

Uses Small, Low Profile External Components
 Low R
DS(ON)
: 100m Ω (typ)
 Over Temperature Protection
 Low Profile TSOT26 Package
 Pb-Free
Package
Pin Assignments
Applications

White LED Torch (Flashlight)

White LED Camera Flash
 DSC(Digital Still Camera)Flash

Cellular Camera Phone Flash
 PDA
Camera Flash
 Camcorder Torch(Flashlight) Lamp
Typical Applications Circuit
I
LED
= 750mA, R
S
= 0.127 Ω
Top View
TSOT26