PAM2803 Datasheet, PDF (1/9 Pages) Power Analog Micoelectronics – 3W High Power White LED Driver

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Diodes Incorporated
PAM2803
3W HIGH POWER WHITE LED DRIVER
Description
The PAM2803 is a step-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.
Pin Assignments
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, RS, 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, 100mΩ
NMOS switch, the device can provide high efficiency even at heavy
load. During the shutdown mode, the feedback resistor RS and the
load are completely disconnected and the current consumption is
reduced to less than 1µA.
The PAM2803 is available in the 6-lead SOT23-6 package.
Features
 LED Power Efficiency: up to 90%
 Current Accuracy: 5%(VIN = 3.6V to 1.8V @VF = 3.7V)
 Low Start-Up Voltage: 0.9V (ILED = 270mA)
 Low Hold Voltage: 0.75 (ILED = 200mA)
 1MHz Switching Frequency
 Uses Small, Low Profile External Components
 Low RDS(ON): 100mΩ (typ)
 Over Temperature Protection
 Low Profile SOT23-6 Package
 Pb-Free Package
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
PAM2803
Document number: DS36400 Rev. 2 - 2
ILED = 750mA, RS = 0.127Ω
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December 2014
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