Diodes AP1507 User Manual

Description

The AP1507 is a monolithic IC designed for a step-down DC/DC converter and is capable of driving a 3A load without an external transistor. Due to reducing the number of external components, the board space can be saved easily. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes the feedback control have good line and load regulation without an external design. Regarding the protected function, the thermal shutdown is to prevent over temperature operating from damaging the device, and current limit is against over current operating of the output switch. If the current limit function occurred and V frequency will be reduced. The AP1507 series operates at a switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed + tolerance on output voltage under specified input voltage and output load conditions, and + version included a fixed 3.3V, 5V, 12V, and an adjustable type. AP1507 is available in a 5-lead TO-252 lead-free or green package.

Features

is down to 0.5V below, the switching

FB

4%

15% on the oscillator frequency. The output

AP1507

150KHz, 3A PWM BUCK DC/DC CONVERTER

Pin Assignments

(Top View)

5 SD

4 FB

3 GND

2 Output

1 V

IN

Metal Tab GND

TO252-5L

Applications

• Output Voltage: 3.3V, 5V, 12V and Adjustable Output Version

• Adjustable Version Output Voltage Range, 1.23V to 18V +

• 150KHz +

• Voltage Mode Non-Synchronous PWM Control

• Thermal-Shutdown and Current-Limit Protection

• ON/OFF Shutdown Control Input

• Operating Voltage can be up to 22V

• Output Load Current: 3A

• Low Power Standby Mode

• Built-in Switching Transistor On Chip

• AP1507-XXD5L-XX

 Totally Lead-Free; RoHS Compliant (Notes 1 & 2)

• AP1507-XXD5-XX

 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)  Halogen and Antimony Free. “Green” Device (Note 3)

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds.

15% Fixed Switching Frequency

4%

• Simple High-Efficiency Step-Down Regulator

• On-Card Switching Regulators

• Positive to Negative Converter

AP1507

Document number: DS31067 Rev. 3 - 2

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×

Typical Application Circuit

(1) Fixed Type Circuit

AP1507

150KHz, 3A PWM BUCK DC/DC CONVERTER

12V

DC Input

C

in

Capacitor

(2) Adjustable Type Circuit

12V

DC Input

C

in

Capacitor

FB

4

AP1507

12

V

in

-33

SD

Output

35

GND

R2

FB

4

12

V

in

AP1507

Output

35

SD

GND

L1

33uH

Inductor

D1

Schottky

Diode

R1

L1

47uH

D1

Schottky Diode

3.3V/3A

Output Load

Co

Capacitor

5V/ 3A

Output Load

Co

Capacitor

V

= V

OUT

FB

(1 +

R1

)

R2

V

= 1.23V, R2 = 1K ~ 3K

FB

(3) Delay Start Circuit

R2

FB

12V

4

DC Input

12

AP1507

in

35

SD

R

DELAY

C

in

Capacitor

C

DELAY

0.1uF

V

10K

AP1507

Document number: DS31067 Rev. 3 - 2

www.diodes.com

GND

Output

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R1

L1

47uH

D1

Schottky Diode

5V/ 3A

Output Load

Co

Capacitor

May 2012

Pin Descriptions

Pin Number Pin Name Description

V

1 2 Output Switching Output 3 GND Ground 4 FB Output Voltage Feedback Control

5 SD

Functional Block Diagram

IN

Operating Voltage Input

ON / OFF Shutdown

AP1507

150KHz, 3A PWM BUCK DC/DC CONVERTER

SD

FB

Current

Source

Bias

1.235V

Reference

+ _

Amp

2.5V

Regulator

Frequency

Compen-

sation

_

Comp +

Start

Up

150kHz

OSC.

Comp

Pre-

Driver

Thermal

Shutdown

200mV

+ _

_

+

220mV

3A

Switch

V

IN

Output

GND

AP1507

Document number: DS31067 Rev. 3 - 2

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AP1507

Absolute Maximum Ratings (T

Symbol Parameter Rating Unit

ESD HBM Human Body Model ESD Protection 2 KV

ESD MM Machine Model ESD Protection 200 V

VCC VSD VFB

V

OUT

PD

TST

TJ

Note: 4. Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time.

Supply Voltage +24 V ON/OFF Pin Input Voltage -0.3 to +18 V Feedback Pin Voltage -0.3 to +18 V Output Voltage to Ground -1 V Power Dissipation Internally Limited W Storage Temperature -65 to +150 Operating Junction Temperature -40 to +125

Recommended Operating Conditions (T

Symbol Parameter Min Max Unit

I

OUT

VOP

TA

Output Current 0 3 A Operating Voltage 4.5 22 V Operating Ambient Temperature -20 +85

= 25°C) (Note4)

A

150KHz, 3A PWM BUCK DC/DC CONVERTER

o

C

o

C

= 25°C)

A

o

C

AP1507

Document number: DS31067 Rev. 3 - 2

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AP1507

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

F

V

I

LEAK

Oscillator Frequency of Short

SCP

Circuit Protect

Saturation Voltage

SAT

Max. Duty Cycle (ON)

DC

Min. Duty Cycle (OFF)

ICL

Current Limit

Output = 0V

Output = -1V

IQ

Quiescent Current

I

STBY

Standby Quiescent Current

VIL

ON/OFF Pin Logic Input Threshold Voltage

VIH

IH

ON/OFF Pin Logic Input Current

IL

ON/OFF Pin Input Current

θ

Thermal Resistance TO252-5L Junction to Case 10

JA

Thermal Resistance

θ

with copper area of approximately

JC

2cm ×2cm

AP1507

Document number: DS31067 Rev. 3 - 2

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

IN

= 1.3V

V

FB

( Adjustable Version Only )

When current limit Occurred and

< 0.5V, TA = 25oC

V

FB

= 3A

I

OUT

No Outside Circuit

= 0V Force Driver On

V

FB

V

= 0V Force Driver On

FB

V

= 12V Force Driver Off

FB

Peak Current No Outside Circuit V

= 0V Force Driver On

FB

Output leakage current

No Outside Circuit V

=12V Force Driver Off

FB

V

= 22V

IN

V

= 12V Force Driver Off

FB

ON/OFF Pin = 5V V

= 22V

IN

Low (Regulator ON) High (Regulator OFF) 2.0 V

= 2.5V (OFF)

LOGIC

V

= 0.5V (ON)

LOGIC

TO252-5L

150KHz, 3A PWM BUCK DC/DC CONVERTER

= 18V for the 12V version. I

IN

Junction to Ambient

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= 25°C.

J

-10

127 150 173

110 173

10 30 50 KHz

1.4

100 0

3.6 4.5

-200 µA

-5 mA 5 10 mA

70

-0.01

-0.1 -1

50

LOAD

1.3

= 0.5A

-50

-100

1.6

1.7

5.5

6.5

150

200

0.6

nA

KHz

V

%

A

µA

V

µA

o

C/W

o

C/W

May 2012

150KHz, 3A PWM BUCK DC/DC CONVERTER

Electrical Characteristics (All Output Voltage Versions)

Specifications with boldface type are for full operating temperature range, the other type are for T

Symbol Parameter Conditions

VIN < 22V

5V <

AP1507-ADJ

AP1507-3.3V

AP1507-5V

AP1507-12V

V

FB

Output Feedback

η Efficiency

V

OUT

Output Voltage

η Efficiency

V

OUT

Output Voltage

η Efficiency

V

OUT

Output Voltage

η Efficiency

0.2A <

I

Programmed for 3V

V

OUT

V

= 12V, I

IN

VIN < 22V

5.5V <

0.2A <

I

V

= 12V, I

IN

VIN < 22V

8V <

0.2A <

I

V

= 12V, I

IN

VIN < 22V

15V <

I

0.2A < V

= 16V, I

IN

LOAD

< 3A

LOAD

< 3A

LOAD

< 3A

LOAD

< 3A

LOAD

= 3A

V

MIN

1.193

1.18

3.168

3.135

4.8

4.75

11.52

11.4

AP1507

Document number: DS31067 Rev. 3 - 2

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AP1507

= 25ºC.

J

Typ.

1.23

74 %

3.3

75 %

5

80 %

12

89 %

V

MAX

1.267

1.28

3.432

3.465

5.2

5.25

12.48

12.6

May 2012

Unit

V

C

Y

C

Y

R

O

G

CH CUR

R

Y

CUR

R

A

Y

CUR

R

Typical Characteristics

83 82 81

80 79

(%)

78 77

IEN

76

EFFI

75

V = 12V

74 73

IN

V = 5V

OUT

I = 3A

O

72

-50 -30 -10 10 30 50 70 90 130110 150 TEMPERATURE (°C)

Efficiency vs. Temperature

1.6

1.5

1.4

E (V)

1.3

LTA

1.2

N V

1.1

ATI

1

0.9

V = 12V

SATU

CC

V = 0V

FB

0.8

V = 0V

SD

0.7

-50 -25 0 25 50 75 100 125 TEMPERATURE (°C)

Saturati on Voltage vs. Temperatur e

15

V = 12V

CC

14

No Load V = 0V

ON

13

Switch ON

)

12

11

ENT (m

10 09 08

SUPPL

07 06

AP1507

150KHz, 3A PWM BUCK DC/DC CONVERTER

78 77

76 75

(%)

74

IEN

73

EFFI

72

71 70

1.6

3A

2A

1.4

1.2

ENT LIMIT (A)

1A

0.5A

1.1

0.9

SWIT

0.7

60

55

50

ENT (µA)

45

40

SUPPL

35

V = 12V

IN

V = 3.3V

OUT

I = 3A

O

-50 -30 -10 10 30 50 70 90 130110 150 TEMPERATURE (°C)

Efficiency vs. Temperature

V = 12V

CC

V = 0V

FB

-50 -25 0 25 50 75 100 125 TEMPERATURE (°C)

Switch Current Limit vs. Temperature

V = 12V

CC

No Load V = 5V

OFF

Switch OFF

05

-50 -30 -10 10 30 50 70 90 130110 150 TEMPERATURE (°C)

Supply Current vs. T emperature

AP1507

Document number: DS31067 Rev. 3 - 2

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30

-50 -30 -10 10 30 50 70 90 130110 150 TEMPERATURE (°C)

Supply Current vs. Temperature

May 2012

T

H

R

H

O

OLTAG

REQ

UENC

Y

H

CK CUR

REN

T

5

Typical Characteristics (cont.)

1.7

1.6

1.5

E (V)

1.4

1.3

LD V

1.2

1.1

ES

1.0

0.9

0.8

-50 -30 -10 10 30 50 70 90 130110 150 TEMPERATURE (°C)

Threshold Voltage vs. Temperature

170

V = 12V

CC

I = 500mA

O

165

V= 5V

OUT

z)

160

(K

155

V = 12V

CC

I = 100mA

O

AP1507

150KHz, 3A PWM BUCK DC/DC CONVERTER

10

0

-10

-20

-30

-40

-50

-60

-70

ON/OFF CURRENT (nA)

-80

V = 12V

IN

-90

-100 0 3 6 9 12 15 18 21

ON/OFF VOLTAGE (V)

(nA)

-10

-20

ON/OFF Current vs. ON/OFF Voltage

10

V = 12V

CC

V = 5V

OUT

0

V = 1.3V

FB

150

-30

F

FEEDBA

145

140

-50 -30 -10 10 30 50 70 90 130110 150 TEMPERATURE (°C)

Frequency vs. Temperat u r e

3.

-40

-50

-50 -30 -10 10 30 50 70 90 130110 150 TEMPERATURE (°C)

Feedba c k C ur r e nt vs. Temperature

3.45

3.4

3.35

3.3

3.25

3.2

3.15

3.1

3.05

VOLTAGE OUTPUT (V)

3.0

V = 12V

IN

I = 3A

O

2.95

2.9

-40 -2 0 20 40 60 80 100 140120 160 TEMPERATURE (°C)

Output Voltage vs. Tempera ture

AP1507

Document number: DS31067 Rev. 3 - 2

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Application Information

Pin Functions +V

IN

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 (+V

– V

IN

approximately V circuitry, the PC board copper area connected to this pin should be kept at a minimum.

Feedback (FB)

Senses the regulated output voltage to complete the feedback loop.

ON/OFF (SD)

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 18V) shuts the regulator down. If this shutdown feature is not needed, the ON/OFF pin can be wired to the ground pin.

Thermal Considerations

The TO-252 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 0.8 in 2 or more square inches of 2 oz. additional copper area which improves the thermal characteristics. With copper areas greater

AP1507

Document number: DS31067 Rev. 3 - 2

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

SAT

/ VIN. To minimize coupling to sensitive

OUT

2

, and ideally should have

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AP1507

150KHz, 3A PWM BUCK DC/DC CONVERTER

than approximately 6in dissipation are realized. If further thermal improvements are needed, double sided, multi-layer PC board with large copper areas and/or airflow will be recommended.

The AP1507 (TO-252 package) junction temperature rises above ambient temperature with a 3A 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 there are many factors that can affect the junction temperature. When load currents higher than 3A are used, double sided or multi-layer PC boards with large copper areas and/or airflow might be needed, especially for high ambient temperatures and high output voltages.

For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should 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 thermal 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, position, location, and even board temperature. 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 the 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.

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, only small improvements in heat

May 2012

Ordering Information

AP1507 - XX

AP1507

150KHz, 3A PWM BUCK DC/DC CONVERTER

XX X X

Output Version

Blank : Adjustable

33 : 3.3V

Package

D5 : TO252-5L

Lead Free

L

: Lead Free

Blank : Green

Packing

-U : Tube

-13 : Tape & Reel 50 : 5.0V 12 : 12V

Device Package Code

Pb

AP1507-XXD5L-XX D5 TO252-5L 80 -U 2500/Tape & Reel -13

Lead-Free

AP1507-XXD5-XX D5 TO252-5L Not available 2500/Tape & Reel -13

Note: 5. 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

Packaging

(Note 5)

Tube/Bulk 13” Tape and Reel

Quantity

Part Number

Suffix

Quantity Part Number Suffix

Marking Information

(1) TO252-5L

( Top view )

Output Type :

Blank : Adjustable

1507-33 : 3.3V 1507-50 : 5.0V 1507-12 : 12V

AP1507

Document number: DS31067 Rev. 3 - 2

Logo

1507 - XX YY WW X

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Internal code

X

L : Lead Free Blank : Green Xth Week : 01~52

Year :

"07" = 2007 "08" = 2008

May 2012

2

150KHz, 3A PWM BUCK DC/DC CONVERTER

Package Outline Dimensions (All Dimensions in mm)

Package Type: TO252-5L

5X b2

E

b3

L3

D

e

5X b

A

c2

A2

H

A1

L

a

E1

Suggested Pad Layout

Package Type: TO252-5L

Y1

Y

X

C1

TO252-5L

Dim Min Max Typ

A 2.19 2.39 2.29 A1 0.00 0.13 0.08 A2 0.97 1.17 1.07

b 0.51 0.71 0.583 b2 0.61 0.79 0.70 b3 5.21 5.46 5.33 c2 0.45 0.58 0.531

D 6.00 6.20 6.10 D1 5.21

e

E 6.45 6.70 6.58 E1 4.32

H 9.40 10.41 9.91

L 1.40 1.78 1.59 L3 0.88 1.27 1.08

a 0° 10°

All Dimensions in mm

Dimensions Value (in mm)

X 5.6

X1 0.6

Y 11.0 Y1 5.6 Y2 2.0 C1 7.2 C2 1.27

− −

AP1507

1.27

−

Y2

C

AP1507

Document number: DS31067 Rev. 3 - 2

X1

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AP1507

150KHz, 3A PWM BUCK DC/DC CONVERTER

IMPORTANT NOTICE

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any produc t described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree t o hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages.

Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.

Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks.

LIFE SUPPORT

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

A. Life support devices or systems are devices or systems which:

1. are intended to implant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user.

B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected

to cause the failure of the life support device or to affect its safety or effectiveness.

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.

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AP1507

Document number: DS31067 Rev. 3 - 2

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