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AP1507

150KHz, 3A PWM BUCK DC/DC CONVERTER

AP1507

Document number: DS31067 Rev. 3 - 2

1 of 12

www.diodes.com

May 2012

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

is down to 0.5V below, the switching

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 +

15% on the oscillator frequency. The output

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

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

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

• 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: 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)

Pin Assignments

(Top View)

TO252-5L

5 SD

4 FB

3 GND

2 Output

Metal Tab GND

1 V

Applications

• Simple High-Efficiency Step-Down Regulator

• On-Card Switching Regulators

• Positive to Negative Converter

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.

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Seite 1 - AP1507

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Seite 2 - Typical Application Circuit

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Seite 3 - Functional Block Diagram

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Seite 4 - = 25°C)

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Seite 9 - Application Information

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Seite 11 - Suggested Pad Layout

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