Diodes AP1509 User Manual

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

Description

The AP1509 series are monolithic IC designed for a stepdown DC/DC converter, and own the ability of driving a 2A load without additional transistor. It saves board space. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control having good line and load regulation without external design. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. If current limit function occurs and V will be reduced. The AP1509 series operates at a switchin g frequency of 150KHz thus allow smaller sized filter components than what would be needed with lower frequenc y switching regulators. Other features include a guaranteed +

4% tolerance on output voltage under specified input voltage and output load conditions, and +15% on the oscillator frequency. The output version included fixed 3.3V, 5V, 12V, and an adjustable type. The chips are available in a standard 8-lead SOP-8 package.

is down below 0.5V, the switching frequency

FB

Pin Assignments

V

1

IN

FB

SD

2

3

4

Output

(Top View)

AP1509

SOP-8L

GND

8

GND

7

GND

6

GND

5

Features

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

• Adjustable Version Output Voltage Range, 1.23V to 18V+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 22V

• Output Load Current: 2A

• SOP-8L Packages

• Low Power Standby Mode

• Built-in Switching Transistor On Chip

• SOP-8L: Available in “Green” Molding Compound (No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

Applications

• Simple High-Efficiency Step-Down Regulator

• On-Card Switching Regulators

• Positive to Negative Converter

AP1509

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×

Typical Application Circuit

(1) Fixed Type Circuit

12V

DC Input

V

IN

C

IN

Capacitor

150KHz, 2A PWM BUCK DC/DC CONVERTER

FB

3

AP1509-

12

33

567

4

SD

GND

Output

8

GND

GNDGND

Schottky Diode

D1

L1

47uH

Inductor

AP1509

3.3V/2A

Output Load

Co

Capacitor

(2) Adjustable Type Circuit

12V

DC Input

C

IN

Capacitor

(3) Delay Start Circuit

12V

DC Input

C

DELAY

0.1uF

C

IN

Capacitor

R

10K

FB

3

GNDGNDGND

8

GND

= V

V

FB

Output

FB

= 1.23V

12

V

IN

AP1509

56 7

4

SD

V

OUT

R2 = 1K ~ 3K

FB

3

V

IN

12

AP1509

56 7

4

SD

DELAY

Output

8

GND

GNDGNDGND

(1 +

R1 1KR2 1K

D1

Schottky

Diode

R1

)

R2

R1 1KR2 1K

D1

Schottky

Diode

L1

39uH

Inductor

L1

39uH

Inductor

2.5V/2A

Output Load

Co

Capacitor

2.5V/2A

Output Load

Co

Capacitor

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Pin Descriptions

Pin Name Description

VIN Operating voltage input

Output Switching output

GND Ground

FB Output voltage feedback control SD ON/OFF Shutdown

Functional Block Diagram

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

SD

FB

Current

Source

bias

1.235V

Reference

+ _

Amp

2.5V

Regulator

Frequecy

compen-

sation

_

Comp

+

Start

up

150kH

z

OSC.

Comp

Pre-

driver

200mV

+ _

_

+

Thermal

Shutdown

220mV

2A

Switch

V

IN

Output

GND

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150KHz, 2A PWM BUCK DC/DC CONVERTER

Absolute Maximum Ratings

Symbol Parameter Rating Unit

ESD HBM Human Body Model ESD Protection

ESD MM Machine Model ESD Protection 200 V

VIN Supply Voltage +24 V VSD ON/OFF Pin Input Voltage -0.3 to +18 V VFB Feedback Pin Voltage -0.3 to +18 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 -40 to +125

Recommended Operating Conditions

Symbol Parameter Min Max Unit

I

Output Current 0 2 A

OUT

VOP Operating Voltage 4.5 22 V

TA Operating Ambient Temperature -20 85

2

AP1509

KV

o

C

o

C

o

C

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AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

Electrical Characteristics

Unless otherwise specified, V 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

F

Oscillator Frequency

OSC

F

V

DC

SCP

SAT

Oscillator Frequency of Short Circuit Protect

Saturation Voltage

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

ICL Current Limit

IL

Output = 0 Output = -1 V

IQ Quiescent Current V

I

STBY

Standby Quiescent Current

VIL

ON/OFF Pin Logic Input

VIH High (regulator OFF) 2.0 -

Threshold Voltage

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

IN

V

= 1.3V

FB

(Adjustable version only)

When current limit occurred and V I

OUT

< 0.5V, Ta = 25 oC

FB

= 2A

No outside circuit

= 0V force driver on

V

FB

= 0V force driver on 100

FB

= 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

V

FB

= 22V -5 mA

IN

= 12V force driver off 5 10 mA

FB

ON/OFF pin = 5V

= 22V

V

IN

Low (regulator ON) -

= 18V for the 12V version. I

IN

-10

LOAD

-50

-100

= 0.5A

127 150 173

110 173

10 30 50 KHz

1.4

1.25

1.5

3 A

-200 uA

70

150

200

0.6

1.3

nA

KHz

V

%

uA

V

IH

ON/OFF Pin Logic Input Current

IL ON/OFF Pin Input Current V

θ

Thermal Resistance SOP-8L

JA

Thermal Resistance

θ

with a copper area of

JC

approximately 3 in

V

= 2.5V (OFF) -0.01

LOGIC

= 0.5V (ON) -0.1 -1

LOGIC

Junction to case

2

SOP-8L

Junction to ambient

15 oC/W

70

uA

o

C/W

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150KHz, 2A PWM BUCK DC/DC CONVERTER

Electrical Characteristics (Continued)

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

AP1509

AP1509-ADJ

AP1509-3.3V

AP1509-5V

AP1509-12V

Symbol Parameter Conditions V

4.5V <

V

FB

η

V

OUT

η

V

OUT

η

V

OUT

η

Output Feedback

Efficiency V Output Voltage Efficiency V Output Voltage Efficiency V Output Voltage Efficiency V

VIN < 22V I

0.2A < programmed for 3V

V

OUT

= 12V, I

IN

4.75V <

0.2A <

= 12V, I

IN

VIN < 22V

7V <

0.2A <

= 12V, I

IN

15V <

0.2A <

= 15V, I

IN

< 2A

LOAD

VIN < 22V

I

< 2A

LOAD

I

< 2A

LOAD

VIN < 22V

I

< 2A

LOAD

=2A 76 76 %

= 2A 78 78 %

= 2A 83 83 %

= 2A 90 90 %

1.193

3.168

3.135

11.52

Typ. V

Min

1.18

1.23

3.3

4.8

4.75

11.4

5

12

Max

1.267

1.28

3.432

3.465

5.2

5.25

12.48

12.6

Unit

V

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Typical Performance Characteristics

AP1509 Efficiency vs. Temperature

=12V, V

(V

IN

86 85 84 83 82 81 80 79 78

Efficiency (%)

77 76 75

-50 -30 -10 10 30 50 70 90 110 130 150

Temperature (TA) (°C)

AP1509 Saturation Voltage vs. Temperature

=12V, VFB=0V, VSD=0)

(V

IN

1.4

1.3

1.2

1.1 1

0.9

0.8

Saturation Voltage (V)

0.7

-50 -25 0 25 50 75 100 125

0.5A

Temperature (TA)　(°C)

=5V, Io=2A)

OUT

2A

1A

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

AP1509 Efficiency vs. Temperature

=12V, V

(V

IN

81 80 79 78 77 76 75

Efficiency (%)

74 73

-50 -30 -10 10 30 50 70 90 110 130 150

Temperature (TA) (°C)

AP1509 Switch Current Limit vs. Temperature

(V

IN

5.5

5

4.5

4

3.5

Switch Current Limit (A)

3

-50-30-101030507090

Temperature (TA) (°C)

=3.3V, Io=2A)

OUT

=12V, VFB=0V)

=12V, No Load, Von/off =0V(Switch ON) ,Von/off =5V(Switch OFF))

(V

IN

15 14 13 12 11 10

9 8 7 6 5

Supply Current (mA)

-50 -30 -10 10 30 50 70 90 110 130 150

Switch ON

Temperature (TA) (°C)

AP1509

Document number: DS31016 Rev. 4 - 2

AP1509 Supply Current vs. Temperature

60 55 50 45 40 35

Supply Current (uA)

30

-50 -30 -10 10 30 50 70 90 110 130 150

Temperature (TA) (°C)

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Switch OFF

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150KHz, 2A PWM BUCK DC/DC CONVERTER

Typical Performance Characteristics (Continued)

AP1509 Threshold Voltage vs. Temperature

=12V, Io=100mA)

(V

IN

1.7

1.6

1.5

1.4

1.3

1.2

1.1 1

0.9

Threshold Voltage (V)

0.8

-50 -30 -10 10 30 50 70 90 110 130 150

AP1509 Frequency vs. Temperature

170

165

160

155

150

Temperature (TA) (°C)

=12V, Io=500mA, V

(V

IN

=5V)

OUT

AP1509

AP1509 ON/OFF Current vs. ON/OFF Voltage

=12V)

(V

IN

10

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

ON/OFF Current (nA)

-100 0 3 6 9 12 15 18 21

ON/OFF Voltage (V)

AP1509 Feedback Current vs. Temperature

10

-10

-20

-30

=12V, V

(V

IN

0

=5V, Vfb=1.3V)

OUT

145

Frequency (KHz)

140

-50 -30 -10 10 30 50 70 90 110 130 150

Temperature (TA) (°C)

AP1509 Output Voltage vs. Temperature

=12V, Io=2A)

(V

IN

3.5

3.45

3.4

3.35

3.3

3.25

(V)

3.2

OUT

3.15

V

3.1

3.05 3

2.95

2.9

-40 -20 0 20 40 60 80 100 120 140 160

Temperature (TA) (°C)

AP1509

Document number: DS31016 Rev. 4 - 2

Feedback Current (nA)

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-40

-50

-50 -30 -10 10 30 50 70 90 110 130 150

Temperature (TA) (°C)

June 2010

(

)

(

)

150KHz, 2A PWM BUCK DC/DC CONVERTER

Typical Performance Characteristics (Continued)

Header Frequency vs. Temperature

1000

900 800 700 600 500 400 300 200

Frequency (KHz)

100

0

-40 10 60 110

Temperature (oC)

Supply Current vs. Temperature

=15V, V

(V

IN

3

OUT

=5V, l

OUT

=0A)

AP1509

Feedback Voltage vs. Temperature

=15V, V

(V

IN

1.26

1.25

1.24

1.23

Feedback Voltage (V)

1.22

-40 10 60 110

Temperature

Supply Current vs. Supply Voltage

(VIN=15V, V

3

OUT

=5V, l

=5V)

o

OUT

C

=0A)

2.5 2

1.5 1

0.5

Supply Current (mA)

0

-40 10 60 110

Temperature

o

C

Efficiency vs. Output Current

=15V, V

(V

IN

90

85

80

Efficiency (%)

75

OUT

=5V)

2.5 2

1.5 1

0.5

Supply Current (mA)

0

0 5 10 15

Supply Voltage (V

Efficiency vs. Output Current

(VIN=15V, V

85

75

65

Efficiency (%)

OUT

=3.3V)

70

0204060

Output Current (mA)

55

0204060

Output Current (mA)

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AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

Functions Description

Pin Functions

+VIN This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be presented 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 – V cycle of approximately V connected to this pin should be minimized.

Feedback

Senses the regulated output voltage to complete the feedback loop.

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 SD pin can be wired to the ground pin.

Thermal Considerations

The SOP-8L package needs a heat sink under most conditions. The size of the heat sink depends on the input voltage, the output voltage, the load current and the ambient temperature. The AP1509 junction temperature rises above ambient temperature for a 2A load and different input and output voltages. The data for these curves was taken with the AP1509 (SOP-8L package) operating as a buck-switching regulator in an ambient temperature of 25 factors. Higher ambient temperatures require more heat sinker.

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 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 increments are all approximate. The increments are affected by a lot of factors. 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, multi-layer 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.

o

C (still air). These temperature increments are all approximate and are affected by many

/ VIN. To minimize coupling to sensitive circuitry, the PC board copper area

OUT

) and approximately – 0.5V, with a duty

SAT

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Ordering Information

AP1509 - XX

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

S X - 13

Output Version

Blank : Adjustable

33 : 3.3V

Package

S : SOP-8L

Lead Free

L : Lead Free

G : Green

Packing

13 : Tape & Reel

50 : 5.0V 12 : 12V

Device

AP1509-XXSL-13 S SOP-8L 2500/Tape & Reel -13 AP1509-XXSG-13 S SOP-8L 2500/Tape & Reel -13

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)

Quantity Part Number Suffix

13” Tape and Reel

Marking Information

(1) SOP-8L

( Top View )

X

5

L : Lead Free

G : Green

: Year : 08, 09,10~

YY

WW

: Week : 01~52; 52

represents 52 and 53 week

: Internal Code

41

X

Logo

Part No. Output Type : Blank : Adjustable

1509-33 : 3.3V 1509-50 : 5.0V

8

1509-XX

WW X

YY

1509-12 : 12V

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150KHz, 2A PWM BUCK DC/DC CONVERTER

Package Outline Dimensions (All Dimensions in mm)

(1) Package Type: SOP-8L

0.254

0.62/0.82

Gauge Plane Seating Plane

3.85/3.95

5.90/6.10

0.10/0.20

Detail "A"

AP1509

7°~9°

1.27typ

8x-0.60

6x-1.27

8x-1.55

Land Pattern Recommendation

0.3/0.5

4.85/4.95

(Unit: mm)

0.35max. 45°

0.15/0.25

1.30/1.50

1.75max.

5.4

7°~9°

Detail "A"

0°/8°

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AP1509

150KHz, 2A 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 product described herein; neither does Diodes In corporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this documen t or products described herein 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 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 p atents 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 dev ices 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.

www.diodes.com

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