AP5002S-U - DIODES Incorporated

AP5002

PWM CONTROL 2A STEP-DOWN CONVERTER

AP5002 Rev. 2 1 of 9 AUGUST 2007

www.diodes.com © Diodes Incorporated

• Input voltage: 3.6V to 22V

• Output voltage: 0.8V to VCC

• Duty ratio: up to 100% PWM control

• Oscillation frequency: 500KHz typ

• Soft-start Current Limit, Enable function

• Thermal Shutdown function

• Built-in internal SW P-channel MOS

• Low ESR output capacitor (Multi-layer chip capacitor

(MLCC)) application

• Efficiency 90%

• SOP-8L: Available in “Green” Molding Compound

(No Br, Sb)

• Lead Free Finish / RoHS Compliant (Note 1)

AP5002 consists of step-down switching regulator with PWM

control. These devices include a reference voltage source,

oscillation circuit, error amplifier, internal PMOS and etc.

AP5002 provides low-r ipple powe r, high efficiency, and excel lent

transient characteristics. The PWM control circuit is able to vary

the duty ratio linearly up to 100%. This converter also contains

an error amplifier circuit as well as a soft-start circuit that prevents

overshoot at startup. An enable function, an over current protect

function and a short circuit protect function are built inside, and

when OCP or SCP happens, the operation frequency will be

reduced from 500KHz to 50KHz. Also, an internal compensation

block is built in to minimum external compon ent count.

With the addition of an internal P-channel Power MOS, a coil,

capacitors, and a diode connected externally, these ICs can

function as step-down switching regulators. They serve as ideal

power supply units for portable devices when coupled with the

SOP–8L mini-package , providing suc h outst anding fe atures as

low current consumption. Since this converter can accommodate

an input voltage up to 23V, it is also suitable for the operation via

an AC adapter.

• PC Motherboard

• LCD Monitor

• Graphic Card

• DVD-Video Pla yer

• Telecom Equipment

• ADSL Modem

• Printer and other Peripheral Equipment

• Microprocessor co re supply

• Networking power supply

AP5002 XX X

Package Packing

S: SOP-8L -U:Tube

-13 : Taping

Lead Free

G: Green

Note: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directi ve Annex Notes 5 and 7.

Tube 13” Tape and Reel

Device Package

Code Packaging

(Note 2) Quantity Part Number

Suffix Quantity Part Number

Suffix

AP5002S S SOP-8L 100 -U 2500/Tape & Reel -13

Note: 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at

http://www.diodes.com/datasheets/ap02001.pdf.

Features General Description

Applications

Ordering Information

AP5002

PWM CONTROL 2A STEP-DOWN CONVERTER

AP5002 Rev. 2 2 of 9 AUGUST 2007

www.diodes.com © Diodes Incorporated

( Top View )

1

2

3

4

8

7

6

5

FB

Output

Comp

SOP-8L

AP5002

Output

EN

Vss

VCC

Name Pin Description

FB 1 Feedback pin

EN 2

Power-off pin

H: Normal operation

(Step-down operation)

L: Step-down operation stopped

(All circuits deactivated)

Comp 3 Compensation pin

VCC 4 IC power supply pin

Output 5、6 Switch Pin. Connect external

inductor/diode here. Minimize trace

area at this pin to reduce EMI.

VSS 7、8 GND Pin

Block Diagram

Oscillation

Circuit Reference Voltage Source

PWM-Switched

Control Circuit

+

-

Vss

VEN

EN

100uA

Comp

FB

Vcc

Thermal

Shutdown

Output

Pin Assignments Pin Descriptions

AP5002

PWM CONTROL 2A STEP-DOWN CONVERTER

AP5002 Rev. 2 3 of 9 AUGUST 2007

www.diodes.com © Diodes Incorporated

Absolute Maximum Ratings

Symbol Parameter Rating Unit

VCC VCC Pin Voltage VSS - 0.3 to VSS + 23 V

VFB Feedback Pin Voltage VSS - 0.3 to VCC V

VEN EN Pin Voltage VSS - 0.3 to VIN V

VOUTPUT Switch Pin Voltage VSS - 0.3 to VIN V

PD Power Dissipation 1000 mW

TJ Operating J unction Temperature Range -20 to +125 oC

TST Storage Temperature Range -65 to +150 oC

Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be

exceeded under any conditions.

Recommended Operating Conditions

Symbol Parameter Min Max Unit

VIN Input Voltage 3.6 22 V

IOUT Output Current 0 2 A

TA Operating Ambient Temperature -20 85 oC

AP5002

PWM CONTROL 2A STEP-DOWN CONVERTER

AP5002 Rev. 2 4 of 9 AUGUST 2007

www.diodes.com © Diodes Incorporated

Electrical Characteristics (VIN = 12V, TA = 25°C, unless otherwise specified)

Symbol Parameter Conditions Min Typ. Max Unit

VIN Input Voltage -- 3.6 - 22 V

VFB Feedback Voltage IOUT = 0.1A 0.784 0.8 0.816 V

IFB Feedback Bias Current IOUT = 0.1A - 0.1 0.5 µA

ISW Switch Current -- 3.5 - - A

ISSS Current Consumption

During Power Off VEN = 0V - 10 - µA

∆VOUT

/VOUT Line Regulation VIN = 5V~18V, IOUT = 0.2A - 1 2 %

∆VOUT

/VOUT Load Regulation IOUT = 0.1 to 2A - 0.5 1 %

fOSC Oscillation Frequency Measure waveform at SW pin 400 500 600 KHz

fOSC1 Frequency of Current Limit

or Short Circuit Protect Measure waveform at SW pin 40 - - KHz

VSH Evaluate oscillation at SW pin 2.0 - -

VSL EN Pin Input Voltage Evaluate oscillation stop at SW pin - - 0.8 V

ISH Ven = 2V -10 - 10 µA

ISL EN Pin Input Leakage

Current Ven = 0.8V -10 - 10 µA

TSS Soft-Start Time -- 0.3 2 5 ms

VIN = 5V, VFB = 0V - 11 0 150

RDSON Internal MOSFET Rdson VIN = 12V, VFB = 0V - 70 100 mΩ

Thermal shutdown 145

oC

Minimum Duty Cycle 6.5 %

θJA Thermal Resistance

Junction-to-Ambient SOP -8L (N ote 3) 124 oC/W

θJC

T

hermal Resistance

Junction-to-Case SOP-8L (Note 3) 25 oC/W

Note: 3. Test condition: Device mounted on 2oz copper, minimum r ecommende d pad layout, FR-4 PCB.

AP5002

PWM CONTROL 2A STEP-DOWN CONVERTER

AP5002 Rev. 2 5 of 9 AUGUST 2007

www.diodes.com © Diodes Incorporated

Typical Application Circuit

C1

330pF

U1

AP5002

1

2

3

4 5

6

7

8

FB

EN

COMP

VCC Output

Output

VSS

R1

6.8K

R5

100K

C7

0.1uF

C8

0.1uF C4

22uF

C6

0.1uF

VOUT = 5V

D1

B340

ON/OFF

C2

22uF

R2

1.2K

VIN+12V

L1 10uH

1 2C3

0.1uF

R4

2K

U1

AP5002

1

2

3

4 5

6

7

8

FB

EN

COMP

VCC Output

Output

VSS

C8

0.1uF

C3

0.1uF

C6

0.1uF

C7

0.1uF

C1

330pF C4

22uF

D1

B340

L1 10uH

1 2

R4

2K

R1

3.3K

VIN+12V

R2

1K

R5

100K VOUT = 3.3V

C2

22uF

ON/OFF

C7

0.1uF

L1 10uH

1 2

D1

B340

ON/OFF

U1

AP5002

1

2

3

4 5

6

7

8

FB

EN

COMP

VCC Output

Output

VSS

C1

330pF C4

22uF

R2

11K

R5

100K

C6

0.1uF

C3

0.1uF

VIN+12V

VOUT = 1V

C2

22uF

C8

0.1uF

R4

1K

R1

3.3K

AP5002

PWM CONTROL 2A STEP-DOWN CONVERTER

AP5002 Rev. 2 6 of 9 AUGUST 2007

www.diodes.com © Diodes Incorporated

Typical Performance Characteristics

AP5002 Vin vs. Frequency

(Vout=3.3V; Iout=0.2A)

570

572

574

576

578

580

582

584

586

588

590

592

0510 15 20

Vin(V)

Frequency (KHz)

AP 5002 Vi n vs. F B

(Vout=3.3V; Iout=0.2A)

0.74

0.75

0.76

0.77

0.78

0.79

0.80

0.81

0.82

0.83

0.84

0 5 10 15 20

Vin (V)

FB (V)

AP 5 002 L in e Reg u lati o n

( Iout=0.2A)

3.43

3.435

3.44

3.445

3.45

3.455

3.46

0 5 10 15 20

Vin(V)

Vout(V)

AP 5 002 L o ad Regu lati o n

(Vin=12V)

3.42

3.43

3.44

3.45

3.46

00.511.52

Iout(A)

Vout(V)

AP 5002 Effi cienc y

0

10

20

30

40

50

60

70

80

90

100

0 0.5 1 1.5 2

Iout(A)

Efficiency(%)

Vout=5V

Vout=3.3V

AP5002

PWM CONTROL 2A STEP-DOWN CONVERTER

AP5002 Rev. 2 7 of 9 AUGUST 2007

Typical Performance Characteristics (Continued)

AP5002 Vout Ripple

(Vin=12V; Vout=5V; Iout=0.2A)

AP5002 Vo ut Ripple

(Vin=12V; Vout=5V; Iout=2A)

Test Circuit

A

FBVCC

VSS

EN

open

FBVCC

VSS

EN

+

-

Oscillation

OUTPUT OUTPUT

A

FB

VCC

VSS

EN

+

-+

-

V

OUTPUT

COMP COMP

COMP

Enable function test Feedback function test

Oper ation function test

1.2K

6.8K

22u

6.8K 1500p

AP5002

PWM CONTROL 2A STEP-DOWN CONVERTER

AP5002 Rev. 2 8 of 9 AUGUST 2007

Function Description

PWM Control

The AP5002 consists of DC/DC converters that employ a

pulse-width modulation (PWM) system.

In converters of the AP5002, the pulse width varies in a range up

to 100%, according to the load current. The ripple voltage

produced by the switching can easily be removed through a filter

because the switching frequency remains constant. Therefore,

these converters provide a low-ripple powe r ov er broad ranges of

input voltage and load current.

Under Voltage Lockout

The under voltage l ockout circuit of the AP5002 assures that the

high-side MOSFET driver ou tpu t remain in the off state w hen ever

the supply voltage drops below 3.3V. Normal operation resumes

once VCC rises above 3.5V.

RDS(ON) Current Limiting

The current limit threshold is set by the internal circuit.

Marking Information

AP5002

(Top view)

YY XX

Part Number

Logo

Xth week: 01~52

Year: "07" = 2007

"08" = 2008

XG : Green

XInternal Code

8765

1234

~

Package Information (unit: mm)

1.27typ 0.3/0.5

7°~9°

4.80/5.30

3.70/4.10

5.79/6.20

0.20typ

7°~9°

3.70/4.10

0.38/1.27

0.08/0.25

Gauge Plane

0.254

Seating Plane

0.35max. 45°

Detail "A"

1.30/1.50

1.75max.

AP5002

PWM CONTROL 2A STEP-DOWN CONVERTER

AP5002 Rev. 2 9 of 9 AUGUST 2007

IMPORTANT NOTICE

LIFE SUPPORT

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further

notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither

does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will

agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages.

Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the

President of Diodes Incorporated.