Diodes Incorporated

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Back to Linear and Low Dropout (LDO) Regulators


Wide Input Voltage Range, 200MA ULDO Regulator

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The AP2205 series is a positive voltage regulator IC fabricated by a high-voltage EPNP process.

The AP2205 has various features such as a wide input voltage range, high accuracy, high ripple rejection, low dropout voltage, low noise, current limit, and ultra-low quiescent current—which make it ideal for use in various USB and portable devices.

The IC consists of a voltage reference, an error amplifier, a resistor network for setting output voltage, a current limit circuit for current protection, a chip enable circuit, a low power shutdown mode for extended battery life, overcurrent protection, overtemperature protection, as well as reverse current protection.

The AP2205 has 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, 3.3V, 5.0V fixed voltage versions and an adjustable voltage version.

The AP2205 is available in the space-saving SOT25 and SOT89 packages.


  • Wide Input Voltage Range: 2.3V to 24V
  • Wide Output Voltage Range: 1.24V to 22V
  • Excellent Ripple Rejection: 60dB @ f = 1kHz
  • Low Dropout Voltage: VDROP = 100mV @ IOUT = 100µA
  • Low Ground Current
  • High Output Voltage Accuracy
  • Compatible with Low ESR Ceramic Capacitor
  • Excellent Line/Load Regulation
  • Thermal Shutdown Function
  • 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/


  • Battery-powered equipments
  • Laptops, palmtops, notebook computers
  • Portable information appliances
  • Industrial/Automotive applications

Product Specifications

Product Parameters

Iq (max) (µA) 36
Iq (typ) (µA) 36
AEC Qualified No
Compliance (Only Automotive supports PPAP) Standard
Type LDO
Output options Adjustable & Fixed
Iout (A) 0.2
Vin (Max) (V) 24
Vin (Min) (V) 2.3
Vout (min) 1.24
Vout (max) 3.3
Fixed Vout (V) 1.5, 1.8, 2.5, 2.8, 3.0, 3.3, 5.0
Adjustable VFB (V) 1.24
Accuracy 25C 2
Noise uV RMS 10-100 kHz 30
VDROPOUT (Max) (V) at Max Current and Max Ouput Voltage 0.5
PSRR (dB) 1kHz 60
Operating Temperature (Ambient) (°C) -40 to 85
Enable Active Yes (High)
Channels 1
Output Discharge No
Power Good No
Reverse Protection Rerverse Current
VCTL Function No

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Technical Documents

Recommended Soldering Techniques


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-2548 2021-10-08 2022-01-08 Additional Wafer Source (JKFAB), New Bill of Materials (BOM) with PdCu Bond Wire, and Assembly/Test (A/T) Site (CAT)