Diodes AP1501 User Manual

AP1501

150KHz, 3A PWM BUCK DC/DC CONVERT ER

Features

• Output voltage: 3.3V, 5V, 12V and adjustable output
version

• Adjustable version output vo l tag e range, 1.23V to

• 150KHZ +

• Voltage mode non-synchronous PWM control

• Thermal-shutdown and current-limit protection

• ON/OFF shutdown control input

• Operating voltage can be up to 40V

• Output load current: 3A

• Low power standb y mode

• Built-in switching transistor on chip

• Lead Free packages: TO263-5L and TO220-5L(R)

• TO263-5L and TO220-5L(R): Available in “Green”

• Lead Free Finish/RoHS Compliant (Note 1)

4%

37V+

Molding Compound (No Br, Sb)

15% fixed switching frequency

Applications

• Simple High-efficiency step-down regulator

• On-card switching regulators

• Positive to negative converter

General Description

The AP1501 is a fully integrated step-down DC/DC converter,
with the ability to drive 3A load without the need of additional
driver components. The AP1501 operates at a switching
frequency of 150KHZ enabling the use of small size filter
components. As a result, board space is reduced and BOM costs
are lowered.

The AP1501 has integrated the shutdown function that allows
standby mode to be activated via an external logic signal input.
The internal compensation facilitates feedback control for line
and load regulation without the need of an external circuitry. The
AP1501 has a built-in Thermal shutdown and Current Limit
function to prevent damage from high operating temperature and
high current operating to the output switch.

Additional features include a guaranteed +/- 4% tolerance on the
output voltage under specified input and output load conditions,
and +/- 15% on oscillator frequency. The AP1501 offers both
fixed and a Adjustable output voltages. For fixed outputs the
AP1501 supports 3.3V, 5.0V and 12V. The package options
available are standard 5-lead TO263 and TO220(R) packages.

Ordering Information

AP1501 - XX

Output version

Blank : Adjustable

33 : 3.3V
50 : 5.0V

Package

K5 : TO263-5L
T5 : TO220-5L

T5R : TO220-5L(R)

12 : 12V

Device

Lead-free

AP1501-XXK5L-U K5 TO263-5L 50 -U NA NA

Lead-free

AP1501-XXK5L-13 K5 TO263-5L NA NA 800/Tape & Reel -13
AP1501-XXK5G-U K5 TO263-5L 50 -U NA NA
AP1501-XXK5G-13 K5 TO263-5L NA NA 800/Tape & Reel -13
AP1501-XXT5L-U T5 TO220-5L 50 -U NA NA

Lead-free

AP1501-XXT5G-U T5 TO220-5L 50 -U NA NA
AP1501-XXT5RL-U T5R TO220-5L(R) 50 -U NA NA

Lead-free

AP1501-XXT5RG-U T5R TO220-5L(R) 50 -U NA NA

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.

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.

Package

Code

Packaging

(Note 2)

AP1501 Rev. 11 1 of 12 JANUARY 2009

XXX X - X

Lead Free

L : Lead Free

G : Green

Packing

U : Tube

13 : Tape & Reel

Tube 13” Tape and Reel

Quantity Part Number

Suffix

.

Quantity Part Number

Suffix

www.diodes.com © Diodes Incorporated

Pin Assignments

( Top View )

AP1501

150KHz, 3A PWM BUCK DC/DC CONVERT ER

( Top View )

5 SD
4 FB
3 Gnd
2 Output

1 V

Metal Tab GND

TO263-5L

Pin Descriptions

Name Description

VIN Operating voltage input

Output Switching output

Gnd Ground

FB Output voltage feedback control
SD ON/OFF shutdown

5 SD
4 FB
3 Gnd
2 Output
1 V

IN

TO220-5L/TO220-5L(R)

IN

AP1501 Rev. 11 2 of 12 JANUARY 2009

www.diodes.com © Diodes Incorporated

Block Diagram

Current
Source

bias

1.235V

Reference

2.5V

Regulator

AP1501

150KHz, 3A PWM BUCK DC/DC CONVERT ER

SD

V

IN

220mV200mV

Start

up

+

Comp

_

_

Comp

+

FB

+
_

Amp

Frequency

compen-

sation

_

Comp
+

150kHz

OSC.

Pre-driver

Thermal

Shutdown

3A

Switch

Absolute Maximum Ratings

Symbol Parameter Rating Unit

ESD MM Machine Model ESD Protection 400 V

VCC Supply Voltage +45 V
VSD ON/OFF Pin input Voltage -0.3 to +40 V
VFB Feedback Pin Voltage -0.3 to +40 V

V

Output Voltage to Ground -1 V

OUT

PD Power Dissipation Internally limited W

TST Storage Temperature -65 to +150

TJ Operating Junction Temperature -20 to +125

T

MJ

Maximum Junction Temperature 150

Output

Gnd

o

C

o

C

oC

AP1501 Rev. 11 3 of 12 JANUARY 2009

www.diodes.com © Diodes Incorporated

f

(reg

)

AP1501

150KHz, 3A PWM BUCK DC/DC CONVERT ER

Recommended Operating Conditions

Symbol Parameter

Rating

VOP Operating Voltage 4.5 to 40 V

TA Oper at i n g Am bi ent Temperatur e -20 to 85

Electrical Characteristics (All Output Voltage Versions)

Unless otherwise specified, V
Specifications with boldface type are for full operating temperature range, the other type are for T

Symbol Parameter Conditions Min Typ. Max Unit

IFB Feedback Bias Current

F

Oscillator Frequency

OSC

V

Saturation Voltage

SAT

DC

Max. Duty Cycle(ON)
Min. Duty cycle(OFF)

ICL Current Limit

Output = 0

IL

Output = -1

IQ Quiescent Current

I

STBY

VIH

Standby Quiescent
Current

VIL

ON/OFF pin Logic Input
Threshold Voltage

ON/OFF Pin Logic

IH

Input Current
ON/OFF Pin Input

IL

Current

= 12V for 3.3V, 5V, adjustable version and V

IN

= 1.3V

V

FB

(Adjustable version only)

I

= 3A

OUT

No outside circuit

= 0V force driver on

V

FB

V

= 0V force driver on 100

FB

V

= 12V force driver off 0

FB

Peak current
no outside circuit

= 0V force driver on

V

FB

Output
Leakage
Current

No outside circuit

= 12V force driver off (Note 3)

V

FB

= 40V 2 60

V

IN

= 12V force driver of

V

FB

ON/OFF pin = 5V

= 40V

V

IN

Low

ulator ON

High (regulator OFF) 2.0

= 2.5V (OFF) 15 25

V

LOGIC

= 0.5V (ON) 0.02 5

V

LOGIC

= 24V for the 12V version. I

IN

J

40

127 150 173

110 173

1.3

3.6 4.0

200

150

= 0.5A

LOAD

= 25ºC.

5 10

1.3

60

100

1.4

1.5

5.5

6.5

250

350

0.6

Units

o

C

KHZ

nA

%

uA

mA
mA

uA

uA

V

A

V

θ

θ

Notes: 3 . Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Feedback pin rem oved from output and

Thermal Resistance

JA

unction to Ambient

Thermal Resistance

JC

Junction to Case

connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force the output transistor switch OFF.

4. Test condition: Device mounted with copper area of approximately 3 in

TO263-5L (Note 4) 37
TO220-5L(R) (Note 4) 31

TO263-5L (Note 4) 6

TO220-5L(R) (Note 4) 5

2

,1oz, no air flow.

o

C/W

o

C/W

AP1501 Rev. 11 4 of 12 JANUARY 2009

www.diodes.com © Diodes Incorporated