Product Brief
WHITE LED DRIVER
Description
The AP3008 is a 1.2MHz PWM boost switching regulator
designed for constant-current white LED driver applica-
tions.
The AP3008 can drive a string of 2 to 3 white LEDs from
a 2.7V supply in series, ensuring uniform brightness and
eliminating several ballast resistors. The AP3008 imple-
ments a constant frequency 1.2MHz PWM control
scheme. The high frequency PWM operation also saves
board space by reducing external component sizes. To
improve efficiency, the feedback voltage is set to 95 mV,
which reduces the power dissipation in the current setting
resistor.
The AP3008 is equipped with OVP protection ability, the
SW pin monitors the output voltage and will turn off the
device if an overvoltage condition is present to prevent
damage from an open circuit condition.
AP3008
Parametric Table
Feedback Voltage (Typ) (mV)
Supply Current (Typ) (mA)
Switch Frequency (Typ) (MHz)
Switch Current Limit (Typ) (mA)
Switch V
CESAT
(Typ) (mV)
OVP Voltage
(Typ) (V)
95
1.9
1.2
320
350
29
SOT-23-5L
Package
Benefits
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Built-in Output Overvoltage Protection
Very Competitive Price
Features
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Inherently Uniform LED Current
High Efficiency up to 84%
Drives 2 to 3 LEDs from a 2.7V Supply
1.2MHz PWM Operation Frequency
Requires Only 0.22
µ
F Output Capacitor
Shutdown Current: < 1
µ
A
Built-in Output Overvoltage Protection
Under Voltage Lock Out (UVLO)
Additional Available Materials
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Samples
Preliminary Datasheet
Demo Board
Application Note
ESD Report
Applications
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Digital Cameras
LCD modules
GPS Receivers
Cellular Phones
PDAs, Handheld Computers
Jul. 2006
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
