Diodes Incorporated

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300MA High Speed, Extremely Low Noise CMOS LDO Regulator

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The AP2127 Series are positive voltage regulator ICs fabricated by CMOS process. The AP2127 Series have features of low dropout voltage, low noise, high output voltage accuracy, and low current consumption which make them ideal for use in various battery-powered devices. AP2127 has 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, 3.3V, 4.2V, 4.75V, 5.2V fixed voltage versions and 0.8V to 5.5V adjustable voltage versions.


  • Wide Operating Voltage: 2.5V to 6V
  • High Output Voltage Accuracy: ±2%
  • High Ripple Rejection: 68dB@ f = 1kHz, 54dB@ f = 10kHz
  • Low Standby Current: 0.1μA
  • Low Dropout Voltage: 170mV@300mA for VOUT = 3.3V, 140mV@300mA for VOUT = 5.2V
  • Low Quiescent Current: 60μA Typical
  • Low Output Noise: 60μVrms@VOUT = 0.8V
  • Short Current Limit: 50mA · Over Temperature Protection
  • Compatible with Low ESR Ceramic Capacitor: 1μF for CIN and COUT 
  • Excellent Line/Load Regulation
  • Soft Start Time: 50μs
  • Auto Discharge Resistance: RDS(ON) = 60Ω


  • Datacom
  • Notebook Computers
  • Mother Board

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Standard
Output options Adjustable & Fixed
Iout (A) 0.3
Vin (Max) (V) 6
Vin (Min) (V) 2.5
Vout (min) 0.8
Vout (max) 6
Fixed Vout (V) 1.0, 1.2, 1.5, 1.8, 2.5, 2.8, 3.0, 3.3, 4.2, 4.75
Adjustabe VFB (V) 0.8
Iq (typ) (µA) 60
Accuracy 25C 2%
Noise uV RMS 10-100 kHz 60
VDROPOUT (Max) (V) at Max Current and Max Ouput Voltage 0.3
PSRR (dB) 1kHz 68
Operating Temperature (Ambient) (°C) -40 to 85 (°C)
Enable Active H
Channels 1
Output Discharge yes
Iq (max)(µA) 90
VCTL function no

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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