Diodes AP3003 User Manual

Data Sheet

150kHz 3A BUCK DC-DC CONVERTER AP3003

General Description

The AP3003 series of regulators are fixed frequency
PWM buck (step-down) DC/DC converter, capable of
driving a 3A load with excellent line and load regula­tion. These regulators include internal frequency com­pensation and a fixed frequency oscillator so that they
are easy to use. A system adopting AP3003 requires a
minimum number of external components to work.

A standard series of inductors, optimized for use with
the AP3003 series, are available from several manu­facturers. This feature greatly simplifies the design of
switch-mode power supplies.

These ICs are available in TO-220-5 and TO-263-5
packages.

Features

· 3.3V, 5V, 12V Fixed (±4% Tolerance) and Adjust-
able (±3% Tolerance) Output Versions

· Guaranteed 3A Output Load Current

· 150kHz Fixed Frequency Internal Oscillator

· Input Voltage Range up to 32V

· Requires only 4 external components

· High Efficiency up to 90%

· Excellent Line and Load Regulation

· TTL Shutdown Capability

· Low Power Standby Mode, I

· Built-in Current Limit Protection and Thermal

Shutdown Circuit

Typically 80µA

Q

Applications

· LCD Monitor and LCD TV

· On-Card DC-DC Converter

· DVD Recorder

· PDP

TO-220-5

Figure 1. Package Types of AP3003

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TO-263-5

Data Sheet

150kHz 3A BUCK DC-DC CONVERTER AP3003

Pin Configuration

T Package

(TO-220-5)

5
4
3
2
1

Metal Tab GND

Figure 2. Pin Configuration of AP3003 (T op View)

ON/OFF
FEEDBACK
GND
OUTPUT
V

IN

Metal Tab GND

Pin Description

Pin Number Pin Name Function

1V

IN

Unregulated input voltage

S Package

(TO-263-5)

5
4
3
2

1

ON/OFF
FEEDBACK
GND

OUTPUT

V

IN

2 OUTPUT Switch driver output

3 GND Ground

4 FEEDBACK Feedback Pin. For fixed version, connect it to system output. For adjustable version,

connect it with an external resistor and capacitor feedback network to program the sys­tem output voltage

5ON

/OFF The TTL logic compatible input to control the regulator on or off

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Data Sheet

150kHz 3A BUCK DC-DC CONVERTER AP3003

Functional Block Diagram

ON

/OFF

5

1

V

2

OUTPUT

3

GND

FEEDBACK

1.23V

REFERENCE

Bias

Current

4

R2

R1

REGULATOR

+

EA

_

For 3.3V

R1=2.49kΩ R2=4.18kΩ

5V

R1=2.49kΩ R2=7.57kΩ

12V

R1=2.49kΩ R2=21.8kΩ

ADJ

R1=Open R2=0Ω

2.5V

2.5V
Frequency Shift

150KHz

OSC

+

_

COMP

START UP

LATCH

220mV200

+

COMP

_

_

COMP

+

DRIVER

&

INV

THERMAL

SHUTDOWN

mV

4.4Ω

1:100

IN

Figure 3. Functional Block Diagram of AP3003

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Data Sheet

150kHz 3A BUCK DC-DC CONVERTER AP3003

Ordering Information

AP3003 -

E1: Lead Free

Circuit Type

G1: Green
TR: Tape and Reel

Blank: Tube

Package

TO-220-5

TO-263-5

Package
T: TO-220-5

S: TO-263-5

Temperature

Range

o

-40 to 85

-40 to 85

C

o

C

ADJ: Adjustable Output

3.3: Fixed Output 3.3V

5.0: Fixed Output 5.0V
12: Fixed Output 12V

Part Number Marking ID

Lead Free Green Lead Free Green

AP3003T-ADJE1 AP3003T-ADJG1 AP3003T-ADJE1 AP3003T-ADJG1 Tube
AP3003T-3.3E1 AP3003T-3.3G1 AP3003T-3.3E1 AP3003T-3.3G1 Tube
AP3003T-5.0E1 AP3003T-5.0G1 AP3003T-5.0E1 AP3003T-5.0G1 Tube
AP3003T-12E1 AP3003T-12G1 AP3003T-12E1 AP3003T-12G1 Tube
AP3003S-ADJE1 AP3003S-ADJG1 AP3003S-ADJE1 AP3003S-ADJG1 T ube
AP3003S-ADJTRE1 AP3003S-ADJTRG1 AP3003S-ADJE1 AP3003S-ADJG1 Tape & Reel
AP3003S-3.3E1 AP3003S-3.3G1 AP3003S-3.3E1 AP3003S-3.3G1 Tube
AP3003S-3.3TRE1 AP3003S-3.3TRG1 AP3003S-3.3E1 AP3003S-3.3G1 Tape & Reel
AP3003S-5.0E1 AP3003S-5.0G1 AP3003S-5.0E1 AP3003S-5.0G1 Tube
AP3003S-5.0TRE1 AP3003S-5.0TRG1 AP3003S-5.0E1 AP3003S-5.0G1 Tape & Reel
AP3003S-12E1 AP3003S-12G1 AP3003S-12E1 AP3003S-12G1 Tube
AP3003S-12TRE1 AP3003S-12TRG1 AP3003S-12E1 A P3003S-12G1 Tape & Reel

Packing

Type

BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with
"G1" suffix are available in green packages.

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Data Sheet

150kHz 3A BUCK DC-DC CONVERTER AP3003

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Input Voltage V

ON

/OFF Pin Voltage V

ON/OFF

Feedback Pin Voltage V

Operating Junction Temperature T

Thermal Resistance
(Junction to Ambient, No Heatsink)

Lead Temperatur e (Soldering, 10sec) T

TO-220-5

R

TO-263-5

LEAD

Storage Temperature Range T

IN

FB

J

θJA

STG

40 V

40 V

40 V

150

60

260

-65 to 150

o

C/W

o

C

o

C

o

C

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 Symbol Value Unit

3.3V

5.0V 32

Maximum Input Voltage (Note 2)

12V 32
ADJ (V

ADJ (V

=3.2V) 32

OUT

=2.5V) 25

OUT

Operating Junction Temperature T

V

IN

J

Note 2: For ADJ version, the recommended supply voltage depends on the needed output voltage.

Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

5

32

-40 to 125

V

o

C