AP3008KTR-E1

AP3008KTR-E1 Datasheet

AP3008

Part	Datasheet
AP3008KTR-E1	AP3008KTR-E1 (pdf)

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Data Sheet WHITE LED DRIVER General Description AP3008 The AP3008 is a 1.2MHz PWM boost switching regulator designed for constant-current white LED driver applications. 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 implements 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 95mV, which reduces the power dissipation in the current setting resistor. • 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 Over-Voltage Protection • Under Voltage Lock Out UVLO The AP3008 is equipped with OVP protection ability, • Digital Cameras the SW pin monitors the output voltage and will turn • LCD modules off the device if an over-voltage condition is present to • GPS Receivers prevent damage from an open circuit condition. • Cellular Phones • PDAs, Handheld Computers The AP3008 is available in SOT-23-5 package. SOT-23-5 Figure Package Type of AP3008 BCD Semiconductor Manufacturing Limited 1 WHITE LED DRIVER Pin Configuration K Package SOT-23-5 SW 1 GND 2 5 VIN 4 SHDN Figure Pin Configuration of AP3008 Top View Data Sheet AP3008 Pin Description Pin Number 1 Pin Name SW GND FB SHDN Function Switch Pin. Connect inductor/diode here. The output voltage can range up to 29V but not extend this limit. If the voltage on this pin is higher than the overvoltage protection threshold OVP , the device comes back to shutdown mode. To restart the chip, one must then send a low to high sequence on shutdown pin or switch off the VIN supply. Ground Pin. Voltage Feedback. Reference voltage is 95mV. Shutdown Pin. Connect to 1.5V or higher to enable device Connect to 0.4V or less to disable device. Input Supply Pin. Must be locally bypassed. BCD Semiconductor Manufacturing Limited 2 WHITE LED DRIVER Functional Block Diagram Data Sheet AP3008 VREF 1.25V 95mV A1 SHDN SHUTDOWN DRIVER COMPARATOR RAMP GENERATOR 2 GND 1.2MHz OSCILLATOR Ordering Information AP3008 Circuit Type Package K SOT-23-5 E1 RoHS TR Tape and Reel Package SOT-23-5 Temperature Range -40 to 85oC AP3008KTR-E1 Marking ID E1B Packing Type Tape & Reel BCD Semiconductor's products as designated with "E1" suffix in the part number are RoHS compliant. BCD Semiconductor Manufacturing Limited 3 WHITE LED DRIVER Absolute Maximum Ratings Note 1 Data Sheet AP3008 Parameter Value Unit Input Voltage SW Voltage FB Voltage SHDN Voltage Thermal Resistance Junction to Atmosphere, no Heat sink oC/W Operating Junction Temperature Storage Temperature Range TSTG -65 to 150 Lead Temperature Soldering, 10sec TLEAD ESD Machine Model ESD Human Body Model 2000 Note 1 Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Parameter Operating Temperature Range Operating Voltage Range Unit BCD Semiconductor Manufacturing Limited 4 WHITE LED DRIVER Electrical Characteristics VIN=3V, VSHDN=3V, TA=25oC, unless otherwise specified.

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Data Sheet

WHITE LED DRIVER General Description

AP3008

The AP3008 is a 1.2MHz PWM boost switching regulator designed for constant-current white LED driver applications.

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 implements 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 95mV, which reduces the power dissipation in the current setting resistor.
• 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 Over-Voltage Protection
• Under Voltage Lock Out UVLO

The AP3008 is equipped with OVP protection ability,
• Digital Cameras the SW pin monitors the output voltage and will turn
• LCD modules off the device if an over-voltage condition is present to
• GPS Receivers
prevent damage from an open circuit condition.
• Cellular Phones
• PDAs, Handheld Computers

The AP3008 is available in SOT-23-5 package.

SOT-23-5 Figure Package Type of AP3008

BCD Semiconductor Manufacturing Limited 1

WHITE LED DRIVER Pin Configuration

K Package SOT-23-5

SW 1 GND 2
5 VIN 4 SHDN

Figure Pin Configuration of AP3008 Top View

Data Sheet AP3008

Pin Description

Pin Number 1

Pin Name SW

GND FB SHDN

Function

Switch Pin. Connect inductor/diode here. The output voltage can range up to 29V but not extend this limit. If the voltage on this pin is higher than the overvoltage protection threshold OVP , the device comes back to shutdown mode. To restart the chip, one must then send a low to high sequence on shutdown pin or switch off the VIN supply.

Ground Pin.

Voltage Feedback. Reference voltage is 95mV.

Shutdown Pin. Connect to 1.5V or higher to enable device Connect to 0.4V or less to disable device.

Input Supply Pin. Must be locally bypassed.

BCD Semiconductor Manufacturing Limited 2

WHITE LED DRIVER Functional Block Diagram

Data Sheet AP3008

VREF 1.25V
95mV A1

SHDN

SHUTDOWN

DRIVER

COMPARATOR

RAMP GENERATOR
2 GND
1.2MHz OSCILLATOR
Ordering Information

AP3008

Circuit Type

Package K SOT-23-5

E1 RoHS TR Tape and Reel

Package SOT-23-5

Temperature Range
-40 to 85oC

AP3008KTR-E1

Marking ID E1B

Packing Type Tape & Reel

BCD Semiconductor's products as designated with "E1" suffix in the part number are RoHS compliant.

BCD Semiconductor Manufacturing Limited 3

WHITE LED DRIVER Absolute Maximum Ratings Note 1

Data Sheet AP3008

Parameter

Value

Unit

Input Voltage

SW Voltage

FB Voltage

SHDN Voltage

Thermal Resistance Junction to Atmosphere, no Heat sink
oC/W

Operating Junction Temperature

Storage Temperature Range

TSTG
-65 to 150

Lead Temperature Soldering, 10sec

TLEAD

ESD Machine Model

ESD Human Body Model
2000

Note 1 Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability.

Recommended Operating Conditions

Parameter Operating Temperature Range Operating Voltage Range

Unit

BCD Semiconductor Manufacturing Limited 4

WHITE LED DRIVER

Electrical Characteristics

VIN=3V, VSHDN=3V, TA=25oC, unless otherwise specified.

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Datasheet ID: AP3008KTR-E1 509832