User guide

ManualsBrandsDiodes ManualsHardwarePAM2803

PAM2803

Document number: DSxxxxx Rev. 1 - 1

1 of 9

www.diodes.com

July 2013

PAM2803

Product Line o

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

, 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

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

= 3.6V to 1.8V @V

= 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 (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

LED

= 750mA, R

= 0.127Ω

Top View

TSOT26

Summary of content (9 pages)

PAGE 1
A Product Line of Diodes Incorporated PAM2803 3W HIGH POWER WHITE LED DRIVER Description Pin Assignments The PAM2803 is a set-up DC-DC converter that delivers a regulated Top View TSOT26 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.
PAGE 2
A Product Line of Diodes Incorporated PAM2803 Pin Description Pin Number Pin Name Function 1 2 3 4 FB Feedback SHDN Shut Down 5 6 VOUT VIN Output Input SW Switch GND Ground Block Diagram Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. All voltages are with respect to ground.
PAGE 3
A Product Line of Diodes Incorporated PAM2803 Thermal Information Parameter Symbol Package Max Thermal Resistance (Junction to Case) θJC TSOT26 130 Thermal Resistance (Junction to Ambient) θJA TSOT26 250 Internal Power Dissipation PD TSOT26 400 Unit °C/W mW Electrical Characteristics (@TA = +25°C, VIN = 2.4V, ILED = 750mA, VSHDN = VIN, L = 2.2µH, CIN = 10µF, CO = 10µF, unless otherwise specified.
PAGE 4
A Product Line of Diodes Incorporated PAM2803 Typical Performance Characteristics (@TA = +25°C, L = 2.2µF, CIN = 10µF, CO = 10µF, unless otherwise specified.) PAM2803 Document number: DSxxxxx Rev. 1 - 1 4 of 9 www.diodes.
PAGE 5
A Product Line of Diodes Incorporated PAM2803 Typical Performance Characteristics (cont.) @TA = +25°C, L = 2.2µF, CIN = 10µF, CO = 10µF, unless otherwise specified.) PAM2803 Document number: DSxxxxx Rev. 1 - 1 5 of 9 www.diodes.
PAGE 6
A Product Line of Diodes Incorporated PAM2803 Application Information Inductor Selection The PAM2803 can use small value inductors due to its switching frequency of 1MHz. The value of inductor will focus in the range of 2.2µH to 4.7µH for most PAM2803 applications. In typical high current white LED applications, it is recommended to use a 4.7µH inductor.
PAGE 7
A Product Line of Diodes Incorporated PAM2803 Ordering Information Part Number Marking Refer to Marking Information Below PAM2803AAF095 Package Type Standard Package TSOT26 3000 Units/Tape&Reel Marking Information Top View TSOT26 PAM2803 Document number: DSxxxxx Rev. 1 - 1 7 of 9 www.diodes.
PAGE 8
A Product Line of Diodes Incorporated PAM2803 Package Outline Dimensions (All dimensions in mm.) TSOT26 PAM2803 Document number: DSxxxxx Rev. 1 - 1 8 of 9 www.diodes.
PAGE 9
A Product Line of Diodes Incorporated PAM2803 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).