AP1501-T5RL-U - DIODES Incorporated

AP1501

150KHz , 3A PWM BUCK DC/ DC CONVERTER

AP1501 Rev. 11 1 of 12 JANUARY 2009

www.diodes.com © Diodes In corporat ed

Lead-free

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

version

• Adjustabl e vers i o n outp ut vo lt ag e r an ge , 1.23 V to

37V+4%

• 150KHZ +15% fixed switching frequency

• 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 standby 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”

Molding Compound (No Br, Sb)

• Lead Free Finish/RoHS Compliant (Note 1)

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.

• Simple High-efficiency step-down regulator

• On-card switching regulators

• Positive to negative converter

Ordering Information

Package

K5 : TO263-5L

Output version

AP1501 - XX XXX X - X

Packing

U : Tube

13 : Tape & Reel

Blank : Adjustable

33 : 3.3V

50 : 5.0V

12 : 12V

Lead Free

L : Lead Free

T5 : TO220-5L

T5R : TO220-5L(R)

G : Green

Device Package

Code Packaging

(Note 2)

Tube 13” Tape and Reel

Quantity Part Number

Suffix Quantity Part Number

Suffix

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

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

AP1501-XXT5G-U T5 TO220-5L 50 -U NA NA

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

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..

Features General Description

Applications

AP1501

150KHz , 3A PWM BUCK DC/ DC CONVERTER

AP1501 Rev. 11 2 of 12 JANUARY 2009

www.diodes.com © Diodes In corporat ed

Pin Assignments

( Top View )

1 VIN

5 SD

4 FB

3 Gnd

2 Output

Met al Tab GND

TO263-5L

1 VIN

5 SD

4 FB

3 Gnd

2 Output

( Top View )

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

Pin Descriptions

Name Description

VIN Operating voltage input

Output Switching output

Gnd Ground

FB Output voltage feedback control

SD ON/OFF shutdown

AP1501

150KHz , 3A PWM BUCK DC/ DC CONVERTER

AP1501 Rev. 11 3 of 12 JANUARY 2009

www.diodes.com © Diodes Incorporated

Current

Source

bias

1.235V

Reference

2.5V

Regulator

150kHz

OSC.

Start

up

+

_

+

_

Thermal

Shutdown

Pre-driver

Comp

Gnd

Output

VIN

SD

FB

220mV200mV

3A

Switch

+

_

Amp

Comp

Frequency

compen-

sation

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

VOUT Output Voltage to Ground -1 V

PD Power Dissipation Internally limited W

TST Storage Temperature -65 to +150 oC

TJ Operating Junction Temperature -20 to +125 oC

TMJ Maximum Junction Temperature 150 oC

Block Diagram

AP1501

150KHz , 3A PWM BUCK DC/ DC CONVERTER

AP1501 Rev. 11 4 of 12 JANUARY 2009

www.diodes.com © Diodes Incorporated

Recommended Operating Conditions

Symbol Parameter Rating Units

VOP Operating Voltage 4.5 to 40 V

TA Ope r at i n g Am bient T em pe rature -20 to 85 oC

Electrical Characteristics (All Output Voltage Versions)

Unless otherwise specified, VIN = 12V for 3.3V, 5V, adjustable version and VIN = 24V for the 12V version. ILOAD = 0.5A

Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25ºC.

Symbol Parameter Conditions Min Typ. Max Unit

IFB Feedback Bias Current

VFB = 1.3V

(Adjustable version only) 40

60 nA

100

FOSC Oscillator Frequency 127 150 173 KHZ

110 173

VSAT Saturation Voltage IOUT = 3A

No outside circuit

VFB = 0V force driver on 1.3

1.4 V

1.5

DC Max. Duty Cycle(ON) VFB = 0V force driver on 100 %

Min. Duty cycle(OFF) VFB = 12V force driver off 0

ICL Current Limit Peak current

no outside circuit

VFB = 0V force driver on 3.6 4.0 5.5 A

6.5

IL Output = 0 Output

Leakage

Current

No outside circuit

VFB = 12V force driver off (Note 3) 200

uA

Output = -1 VIN = 40V 2 60 mA

IQ Quiescent Current VFB = 12V force driver of

f

5 10

mA

ISTBY Standby Quiescent

Current ON/ OFF pi n = 5V

VIN = 40V 150

250 uA

350

VIL ON/OFF pin Logic Input

Threshold Voltage

Low

(

re

g

ulator ON

)

1.3 0.6 V

VIH High (reg ulator OFF) 2.0

IH ON/OFF Pin Logic

Input Current VLOGIC = 2.5V (OFF) 15 25 uA

IL ON/OFF Pin Input

Current VLOGIC = 0.5V (ON) 0.02 5

θJA Thermal Resistance

unction to Ambient TO263-5L (Note 4) 37 oC/W

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

θJC Thermal Resistance

Junction to Case

TO263-5 L (Note 4) 6 oC/W

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

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

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 in2,1oz, no air flow.

AP1501

150KHz , 3A PWM BUCK DC/ DC CONVERTER

AP1501 Rev. 11 5 of 12 JANUARY 2009

www.diodes.com © Diodes Incorporated

Electrical Characteristics (Continued)

Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25ºC.

Symbol Parameter Conditions VMin Typ. VMax Unit

AP1501-ADJ FB

V Output

Feedback

4.5V < VIN < 40V

0.2A < ILOAD < 3A

VOUT programmed for 3V

1.193

1.18 1.23

1.267

1.28

V

η Efficiency VIN = 12V, I LOAD = 3A 73 %

AP1501-3.3V OUT

V Output Voltage 4.75V < VIN < 40V

0.2A < ILOAD < 3A 3.168

3.135 3.3 3.432

3.465 V

η Efficiency VIN = 12V, I LOAD = 3A 73 %

AP1501-5V OUT

V Output Voltage 7V < VIN < 40V

0.2A < ILOAD < 3A 4.8

4.75 5 5.2

5.25 V

η Efficiency VIN = 12V, I LOAD = 3A 80 %

AP1501-12V OUT

V Output Voltage 15V < VIN < 40V

0.2A < ILOAD < 3A 11.52

11.4 12 12.48

12.6 V

η Efficiency VIN = 15V, I LOAD = 3A 90 %

AP1501

150KHZ, 3A PWM BUCK DC/D C CONVERT ER

AP1501 Rev. 11 6 of 12 JANUARY 2009

www.diodes.com © Diodes Incorporated

Typical Performance Characteristics

Typical Performance Characteristic

s

Normalized Output Voltage

4.90

4.95

5.00

5.05

5.10

-50 -25 0 25 50 75 100 125

OUTPUT VOLTAGE (V)

V

IN

=20V, I

LOAD

=3A

Normalized at T

J

=25

o

C

JUNCTION TEMPERATURE(

o

C)

JUNCTION TEMPERATURE(

o

C)

SWITCH CURRENT LIMIT (A)

Switch Current Limit

0.0

5.0

10.0

15.0

20.0

25.0

-50 -25 0 25 50 75 100 125

JUNCTION TEMPERATURE(

o

C)

SUPPLY CURRENT (mA)

Operating Quiescent Current

JUNCTION TEMPERATURE(

o

C)

EFFICIENCY (%)

Efficiency

100

65

70

75

80

85

90

95

810152025

30 35 40

5V

3.3V

3A Load

0.60

0.80

1.00

1.20

1.40

1.60

0.5 123

SWITCH CURRENT(A)

SATURATION VOLTAGE (V)

1

2

3

1 : -40

o

C

2 : 25

o

C

3 : 125

o

C

Switch Saturation Voltage

3.50

4.00

4.50

5.00

5.50

-50 -25 0 25 50 75 100 125

V

IN

=12V, V

OUT

=5V

SUPPLY VOLOTAGE (V)

CURRENT (uA)

0.0

40.0

80.0

120.0

160.0

200.0

Shutdown Quiescent Current

10 20 30 40

V

ON/OFF

=5V

1 : -40

o

C

2 : 25

o

C

3 : 125

o

C

1

3

2

Switch ON

Switch OFF

AP1501

150KHz , 3A PWM BUCK DC/ DC CONVERTER

AP1501 Rev. 11 7 of 12 JANUARY 2009

www.diodes.com © Diodes Incorporated

Typical Performance Characteristics (Continued)

JUNCTION TEMPERATURE(

o

C)

BIAS CURRENT (nA)

Feedback Pin Bias Current

1.45 10152022232425

ON/OFF PIN VOLTAGE (V)

CURRENT (uA)

ON/OFF Pin Current (Sinking)

0.0

30.0

60.0

90.0

120.0

150.0

V

IN

=40V

-40

o

C T

J

125

o

C

≤≤

0.0

10.0

20.0

30.0

40.0

50.0

-50 -25 0 25 50 75 100 125

Adjustable Version Only

0.0

1.0

2.0

3.0

4.0

5.0

-50 -25 0 25 50 75 100 125

JUNCTION TEMPERATURE (

o

C)

SUPPLY VOLTAGE (V)

Minimum Operating Supply Voltage

V

OUT

=1.23V

I

LOAD

=120mA

JUNCTION TEMPERATURE (

o

C)

THRESHOLD VOLTAGE (V)

ON/OFF Threshold Voltage

0.0

1.0

2.0

3.0

4.0

5.0

-50 -25 025 50 75 100 125

Switch Frequency

JUNCTION TEMPERATURE (

o

C)

FREQUENCY (kHz)

0.0

50.0

100.0

150.0

200.0

-50 -25 0 25 50 75 100 125

AP1501

150KHz , 3A PWM BUCK DC/ DC CONVERTER

AP1501 Rev. 11 8 of 12 JANUARY 2009

www.diodes.com © Diodes Incorporated

12

35

4

12V

DC Input

Cin

Capacitor

FB

SD D1

B340A

Vin

Gnd

Output

AP1501

-33

Co

Capacitor

Inductor

L1

33uH 3.3V/3A

Output Lo ad

Typical Application Circuit

(1) Fixed Type Circuit

(2) Adjustable Type Circuit

12

35

4

12V

DC Input

Cin

Capacitor

FB

SD D1

(Note 5)

Vin

Gnd

Output

AP1501

Co

Capacitor

L1

47uH 5V/ 3A

Output Load

R2 R1

V

out = VFB

×

(1 +R2

R1 )

V

FB = 1.23V

R2 = 1K ~ 3K

(3) Delay Start Circuit

12

35

4

12V

DC Input

Cin

Capacitor

FB

SD D1

(Note 5)

Vin

Gnd

Output

AP1501

Co

Capacitor

L1

47uH 5V/ 3A

Output Load

R2 R1

CDELAY

0.1uF

10K

RDELAY

Notes: 5. Suggested DIODES Power Schottky: B340A or PDS340 series.

AP1501

150KHz , 3A PWM BUCK DC/ DC CONVERTER

AP1501 Rev. 11 9 of 12 JANUARY 2009

Functional Description

Pin Functions

+VIN

This is the positive input supply for the IC switching regulator. A

suitable input bypass capacitor must be present at this pin to

minimize voltage transients and to supply the switching currents

needed by the regulator.

Ground

Circuit ground.

Output

Internal switch. The voltage at this pin switches between (+VIN –

VSAT) and approximately – 0.5V, with a duty cycle of

approximately VOUT / VIN. To minimize coupling to sensitive

circuitry, the PC board copper area connected to this pin should

be kept a minimum.

Feedback

Senses the regulated output voltage to complete the feedback

loop.

ON/OFF

Allows the switching regulator circuit to be shutdown using logic

level signals thus dropping the total input supply current to

approximately 150uA. Pulling this pin below a threshold voltage

of approximately 1.3V turns the regulator on, and pulling this pin

above 1.3V (up to a maximum of 40V) shuts the regulator down.

If this shutdown feature is not needed, the ON/OFF pin can be

wired to the ground pin or it can be left open, in either case the

regulator will be in the ON condition.

Therma l Considerat ions

The AP1501 is available in 5-pin surface mount TO-263 and

TO-220.

The TO-220 package needs a heat sink under most conditions.

The size of the heat sink depen ds o n the inp ut voltage , the output

voltage, the load current and the ambient temperature. The

AP1501 junction temperature rises above ambient temperature

for a 3A load and different input and output voltages. The data

for these curves was taken with the AP1501 (TO-220 package)

operating as a buck switching regulator in an ambient

temperature of 25oC (still air). These temperature rise numbers

are all approximate and there are many factors that can affect

these temperatures. Higher ambient temperatures require more

heat sinking.

The TO-263 surface mount package tab is designed to be

soldered to the copper on a printed circuit board. The copper

and the board are the heat sink for this package and the other

heat producing components, such as the catch diode and

inductor. The PC board copper area that the package is

soldered to should be at least 0.4 in2, and ideally should have

2 or more square inche s of 2 oz. A d ditional cop per area imp rov es

the thermal characteristics, but with copper areas greater than

approximately 6 in2, only small improvements in heat dissipation

are realized. If further thermal improvements are needed, double

sided, multilayer PC boards with large copper areas and/or

airflow are recommended.

The AP1501 (TO-263 package) junction temperature rises above

ambient temperature with a 2A load for various input and output

voltages. This data was taken with the circuit operating as a

buck switching regulator with all components mounted on a

PC board to simulate the junction temperature under actual

operating conditions. This curve can be used for a quick check

for the approximate junction temperature for various conditions,

but be aware that there are many factors that can affect the

junction temperature. When load currents higher than 2A are

used, double sided or multilayer PC boards with large copper

areas and/or airflow might b e needed, esp ecially for high am bient

temperatures and high output voltages.

For the best thermal performance, wide copper traces and

generous amounts of printe d circuit board coppe r sh ould be used

in the board layout. (One exception to this is the output (switch)

pin, which should not have large areas of copper.) Large areas

of copper provide the best transfer of heat (lower thermal

resistance) to the surrounding air, and moving air lowers the

therma l resistance even further.

Package thermal resistance and junction temperature rise

numbers are all approximate, and there are many factors that will

affect these numbers. Some of these factors include board size,

shape, thickness, positio n, location, and even board temperatu re.

Other factors are, trace width, total printed circuit copper area,

copper thickness, single or double-sided, multilayer board and

the amount of solder on the board. The effectiveness of the

PC board to dissipate heat also depends on the size, quantity

and spacing of other components on the board, as well as

whether the surrounding air is still or moving.

Furthermore, some of these components such as t he catch diode

will add heat to the PC board and the heat can vary as the input

voltage changes. For the inductor, depending on the physical

size, type of core material and the DC resistance, it could either

act as a heat sink taking heat away from the board, or it could

add heat to the board.

AP1501

150KHz , 3A PWM BUCK DC/ DC CONVERTER

AP1501 Rev. 11 10 of 12 JANUARY 2009

(1) TO263-5L

1501-XX

Output Type :

1501 : ADJ

1501-33 : 3.3V

1501-50 : 5.0V

1501-12 : 12V

Logo

ID code

Year :

( Top View )

"08" = 2008

"07" = 2007

YY WW X X

Xth week : 01~52

~

L : Lead Free

G : Green

(2) TO220-5L(R)

1501-XX

Output Type :

1501: ADJ

1501-33: 3.3V

1501-50: 5.0V

1501-12: 12V

Logo

ID code

"08" = 2008

Year : "07" = 2007

YY WW X X

Xth week : 01~52

~

L : Lead Free

( Top view )

G : Green

Marking Information

AP1501

150KHz , 3A PWM BUCK DC/ DC CONVERTER

AP1501 Rev. 11 11 of 12 JANUARY 2009

Package Information

(1) Package Type: TO263-5L

(2) Package Type: TO220-5L

AP1501

150KHz , 3A PWM BUCK DC/ DC CONVERTER

AP1501 Rev. 11 12 of 12 JANUARY 2009

Package Information (Continued)

(3) Package Type: TO220-5L(R) Mechanical drawing

IMPORTANT NOTICE

LIFE SU PPOR T

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.