AP1509-12SG-13 - DIODES Incorporated

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

AP1509

Document number: DS31016 Rev. 4 - 2 1 of 13

www.diodes.com June 2010

Description

The AP1509 series are monolithic IC designed for a step-

down 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 VFB is down below 0.5V, the switching frequency

will be reduced. The AP1509 series operates at a switching

frequency of 150KHz thus allow smaller sized filter

components than what would be needed with lo wer frequenc y

switching regulators. Other features include a guaranteed

+4% tolerance on output voltage under specif ied 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 availa ble in a standard

8-lead SOP-8 package.

Pin Assignments

(Top View)

VIN

GND

FB AP1509

GND

Output

GND

SOP-8L

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 Freque ncy

• 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)

Applications

• Simple High-Efficiency Step-Down Regulator

• On-Card Switching Regulators

• Positive to Negative Converter

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.

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

AP1509

Document number: DS31016 Rev. 4 - 2 2 of 13

www.diodes.com June 2010

Typical Application Circuit

(1) Fixed Type Circuit

12V

DC Input

CIN

Capacitor

SD D1

Schottky Diod e

VIN

GND

Output

AP1509-

Capacitor

Inductor

47uH 3.3V/2A

Output L oad

GNDGND

GND

567

(2) Adjustable Type Circuit

12V

DC Input

CIN

Capacitor

SD D1

Schottky

Diode

VIN

GND

Output

AP1509

Capacitor

Inductor

39uH 2.5V/2A

Output Load

GNDGNDGND

56 7

R1 1KR2 1K

VOUT = VFB

(1 + R2

R1 )

VFB = 1.23V

R2 = 1K ~ 3K

(3) Delay Start Circuit

12V

DC Input

CIN

Capacitor

SD D1

Schottky

Diode

VIN

GND

Output

AP1509

Capacitor

Inductor

39uH 2.5V/2A

Output Load

GNDGNDGND

56 7

R1 1KR2 1K

CDELAY

0.1uF

10K

RDELAY

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

AP1509

Document number: DS31016 Rev. 4 - 2 3 of 13

www.diodes.com June 2010

Pin Descriptions

Functional Block Diagram

Current

Source

bias

1.235V

Reference 2.5V

Regulator

150kH

OSC.

Start

Thermal

Shutdown

Pre-

driver

Comp

GND

Output

VIN

220mV

200mV

Switch

Amp Comp

Frequecy

compen -

sation

Pin Name Description

VIN Operating voltage input

Output Switching output

GND Ground

FB Output voltage feedback control

SD ON/OFF Shutdown

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

AP1509

Document number: DS31016 Rev. 4 - 2 4 of 13

www.diodes.com June 2010

Absolute Maximum Ratings

Symbol Parameter Rating Unit

ESD HBM Human Body Model ESD Protection 2 KV

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

VOUT Output Voltage to Ground -1 V

PD Power Dissip ation Internally Limited W

TST Storage Temperature -65 to +150 oC

TJ Operating Junction Temperature -40 to +125 oC

Recommended Operating Conditions

Symbol Parameter Min Max Unit

IOUT Output Current 0 2 A

VOP Operating Voltage 4.5 22 V

TA Operating Ambient Temperature -20 85 oC

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

AP1509

Document number: DS31016 Rev. 4 - 2 5 of 13

www.diodes.com June 2010

Electrical Characteristics

Unless otherwise specified, VIN = 12V for 3.3V, 5V, adjustable version and VIN = 18V 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) -10

-50 nA

-100

FOSC Oscillator Frequency 127 150 173 KHz

110 173

FSCP Oscillator Frequency of

Short Circuit Protect When current limit occurred

and VFB < 0.5V, Ta = 25 oC 10 30 50 KHz

VSAT Saturation Voltage IOUT = 2A

No outside circuit

VFB = 0V force driver on 1.25

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 A

IL Output = 0 Output

Leakage

Current

No outside circuit

VFB = 12V force driver off -200 uA

Output = -1 VIN = 22V -5 mA

IQ Quiescent Current VFB = 12V force driver off 5 10 mA

ISTBY Standby Quiescent

Current ON/OFF pin = 5V

VIN = 22V 70

150 uA

200

VIL ON/OFF Pin Logic Input

Threshold Voltage

Low (regulator ON) - 1.3 0.6 V

VIH High (regulator OFF) 2.0 -

IH ON/OFF Pin Logic Input

Current VLOGIC = 2.5V (OFF) -0.01 uA

IL ON/OFF Pin Input Current VLOGIC = 0.5V (ON) -0.1 -1

θJA Thermal Resistance SOP-8L Junction to

case 15

oC/W

θJC Thermal Resistance

with a copper area of

approximately 3 in2 SOP-8L Junction to

ambient 70

oC/W

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

AP1509

Document number: DS31016 Rev. 4 - 2 6 of 13

www.diodes.com June 2010

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

AP1509-ADJ FB

V Output

Feedback

4.5V < VIN < 22V

0.2A < ILOAD < 2A

VOUT programmed for 3V

1.193

1.18 1.23 1.267

1.28 V

η Efficiency VIN = 12V, ILOAD=2A 76 76 %

AP1509-3.3V OUT

V Output Voltage 4.75V < VIN < 22V

0.2A < ILOAD < 2A 3.168

3.135 3.3 3.432

3.465 V

η Efficiency VIN = 12V, ILOAD = 2A 78 78 %

AP1509-5V OUT

V Output Voltage 7V < VIN < 22V

0.2A < ILOAD < 2A 4.8

4.75 5 5.2

5.25 V

η Efficiency VIN = 12V, ILOAD = 2A 83 83 %

AP1509-12V OUT

V Output Voltage 15V < VIN < 22V

0.2A < ILOAD < 2A 11.52

11.4 12 12.48

12.6 V

η Efficiency VIN = 15V, ILOAD = 2A 90 90 %

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

AP1509

Document number: DS31016 Rev. 4 - 2 7 of 13

www.diodes.com June 2010

Typical Performance Characteristics

AP1509 Efficiency vs. Temperature

(VIN=12V, VOUT=5V, Io=2A)

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

Temperature (TA) (°C)

Efficie ncy (%)

AP1509 Efficiency vs. Temperature

(VIN=12V, VOUT=3.3V, Io=2A)

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

Temperature (TA) (°C)

Effi ciency (%)

AP1509 Saturation Voltage vs. Temperature

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

0.7

0.8

0.9

1.1

1.2

1.3

1.4

-50 -25 0 25 50 75 100 125

Temperature (TA) 　(°C)

Saturation Voltage (V)

0.5A

AP1509 S witch Current L i mit vs. Temperature

(VIN=12V, VFB=0V)

3.5

4.5

5.5

-50-30-101030507090

Temperature (TA) (°C)

Switch Current Limit (A)

AP1509 Supply Current vs. Temperature

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

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

Temperature (TA) (°C)

Supply Current (mA)

Switch ON

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

Temperature (TA) (°C)

Supply Current (uA)

Switch OFF

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

AP1509

Document number: DS31016 Rev. 4 - 2 8 of 13

www.diodes.com June 2010

Typical Performance Characteristics (Continued)

AP1509 Threshold Voltage vs. Temperature

(VIN=12V, Io=100mA)

0.8

0.9

1.1

1.2

1.3

1.4

1.5

1.6

1.7

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

Temperature (TA) (°C)

Threshold Voltage (V)

AP1509 ON/OFF Current vs. ON/OFF Voltage

(VIN=12V)

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0 3 6 9 12 15 18 21

ON/OFF Voltage (V)

ON/OFF Current (nA)

AP1509 Frequency v s. Temperature

(VIN=12V, Io=500mA, VOUT=5V)

140

145

150

155

160

165

170

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

Temperature (TA) (°C)

Frequency (KHz)

AP1509 Feedback Current vs. Temperature

(VIN=12V, VOUT=5V, Vfb=1.3V)

-50

-40

-30

-20

-10

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

Temperature (TA) (°C)

Feedback Current (nA)

AP1509 Output Voltage vs. Temperature

(VIN=12V, Io=2A)

2.9

2.95

3.05

3.1

3.15

3.2

3.25

3.3

3.35

3.4

3.45

3.5

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

Temperature (TA) (°C)

VOUT (V)

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

AP1509

Document number: DS31016 Rev. 4 - 2 9 of 13

www.diodes.com June 2010

Typical Performance Characteristics (Continued)

Header Frequency v s. Temperature

Feedback Voltage v s. Temperature

(VIN=15V, VOUT=5V)

100

200

300

400

500

600

700

800

900

1000

-40 10 60 110

Frequency (KHz)

Temperature (

1.22

1.23

1.24

1.25

1.26

-40 10 60 110

Feedback Voltage (V)

Tem

erature

(

)

Supply Current vs. Temperature

(VIN=15V, VOUT=5V, lOUT=0A) Supply Current vs. Supply Voltage

(VIN=15V, VOUT=5V, lOUT=0A)

0.5

1.5

2.5

-40 10 60 110

Supply Current (mA)

Tem

erature

(

)

0.5

1.5

2.5

0 5 10 15

Supply Current (mA)

Volta

(

)

Efficiency vs. Output Current

(VIN=15V, VOUT=5V) Efficiency vs. Output Current

(VIN=15V, VOUT=3.3V)

0204060

Eff iciency (%)

Output Current (mA)

0204060

Efficiency (%)

O utput Current (mA)

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

AP1509

Document number: DS31016 Rev. 4 - 2 10 of 13

www.diodes.com June 2010

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 – 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 minimized.

Feedback

Senses the regulated output voltage to complete the feedback loo p.

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 25oC (still air). These temperature increments are all approximate and are affected by many

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, mu lti-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.

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

AP1509

Document number: DS31016 Rev. 4 - 2 11 of 13

www.diodes.com June 2010

Ordering Information

Package

S : SOP-8L

Output Version

AP1509 - XX S X - 13

13 : Tape & Reel

Blank : Adjustable

33 : 3.3V

50 : 5.0V

12 : 12V

Lead Free

L : Lead Free

G : Green

Packing

Device Package

Code Packaging

(Note 2) 13” Tape and Reel

Quantity Part Number Suffix

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.

Marking Information

(1) SOP-8L

( Top View )

1509-XX

Logo

Part No.

G : Green

L : Lead Free

Output Type :

Blank : Adjustable

1509-33 : 3.3V

1509-50 : 5.0V

1509-12 : 12V

WW : Week : 01~52; 52

YY : Year : 08, 09,10~

X : Internal Code

represents 52 and 53 week

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

AP1509

Document number: DS31016 Rev. 4 - 2 12 of 13

www.diodes.com June 2010

Package Outline Dimensions (All Dimensions in mm)

(1) Package Type: SOP-8L

1.27typ 0.3/0.5

7°~9°

4.85/4.95

3.85/3.95

5.90/6.10

0.15/0.25

7°~9°

0.62/0.82

0.10/0.20

Gauge Plane

0.254

Seating Plane

0.35max. 45°

Detail "A"

1.30/1.50

1.75max.

Land Pattern Recommendation

(Unit: mm)

6x-1.27

8x-1.55

8x-0.60

5.4

0°/8°

AP1509

150KHz, 2A PWM BUCK DC/DC CONVERTER

AP1509

Document number: DS31016 Rev. 4 - 2 13 of 13

www.diodes.com June 2010

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DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIE D WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

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changes without further notice to this document and any product described herein. Diodes Incorporat ed does not assume an y liability

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the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

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