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Diodes PAM2803 User Manual

Pam2803, Description, Features

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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

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






Top View

TSOT26