Diodes Incorporated
SO 8

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PWM Control 2A Step-Down Converter

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The AP1534 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS.

The AP1534 provides low-ripple power, high-efficiency and excellent transient characteristics. The PWM control circuit is able to vary the duty ratio linearly from 0% up to 99%. This converter also contains an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup. An enable function, an overcurrent protect function and a short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced from 300kHz to 50kHz. Also, an internal compensation block is built in to minimize external component count.

With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SO-8 mini-packages, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 18V, it is also suitable for the operation via an AC adapter.  


  • Input Voltage: 3.6V to 18V
  • Output Voltage: 0.8V to VCC
  • Duty Ratio: 0% to 99% PWM Control
  • Oscillation Frequency: 300kHz Typical
  • Current Limit, Enable Function
  • Thermal Shutdown Function
  • Built-in Internal SW P-Channel MOS
  • SO-8: Available in “Green” Molding Compound (No Br, Sb)
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/


  • PC motherboards
  • LCD monitors
  • Graphic cards
  • DVD-video players
  • Telecom equipment
  • ADSL modems
  • Printers and other peripheral equipment
  • Microprocessor core supplies

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Type Buck
Minimum Input Voltage (V) 3.6
Maximum Input Voltage (V) 18
Output Current (A) 2
Minimum Output Voltage (V) 0.8
Maximum Output Voltage (V) VIN
Shutdown Current Typ (µA) 10
Frequency Typ (kHz) 300
HS RDS(ON) (mΩ) 100

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site