AP3008 Datasheet, PDF (1/2 Pages) BCD Semiconductor Manufacturing Limited – WHITE LED DRIVER

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.
Features
· 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 0.22µF Output Capacitor
· Shutdown Current: < 1µA
· Built-in Output Overvoltage Protection
· Under Voltage Lock Out (UVLO)
Parametric Table
Product Brief
AP3008
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)
Package
95
1.9
1.2
320
350
29
SOT-23-5L
Benefits
· Built-in Output Overvoltage Protection
· Very Competitive Price
Additional Available Materials
· Samples
· Preliminary Datasheet
· Demo Board
· Application Note
· ESD Report
Applications
· Digital Cameras
· LCD modules
· GPS Receivers
· Cellular Phones
· PDAs, Handheld Computers
Jul. 2006
BCD Semiconductor Manufacturing Limited