Diodes Incorporated

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Back to Linear and Low Dropout (LDO) Regulators


Wide Input Voltage Range, 150MA ULDO Regulator

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The AP7381 series is a positive voltage regulator IC.

The AP7381 has features of wide input voltage range, high accuracy, low dropout voltage, 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, and a chip enable circuit.

The AP7381 has 3.3V, 5V fixed voltage version.

The AP7381 is available in space-saving SOT89 (Option 2) and TO92 (Ammo Packing) packages.


  • Wide Input Voltage Range: Up to 40V
  • Low Dropout Voltage: VDROP = 1000mV@IOUT = 100mA @ Vout=3.3V
  • Low Ground Current
  • High Output Voltage Accuracy
  • Compatible with Low ESR Ceramic Capacitor
  • Excellent Line/Load Regulation
  • Thermal Shutdown Function
  • Short Current Protection Function


  • E-Meter
  • Battery-powered Equipment
  • Laptop, Palmtops, Notebook Computers
  • Portable Information Appliances

Product Specifications

Product Parameters

Iq (max) (µA) 5
Iq (typ) (?A) 2.5
AEC Qualified No
Compliance (Only Automotive supports PPAP) Standard
Type LDO
Output options Fixed
Iout (A) 0.15
Vin (Max) (V) 40
Vin (Min) (V) 3.3
Vout (min) 2.8
Vout (max) 7
Fixed Vout (V) 2.8, 3.3, 5.0, 7.0
Accuracy 25C 2%
VDROPOUT (Max) (V) at Max Current and Max Ouput Voltage 1
PSRR (dB) 1kHz 60
Operating Temperature (Ambient) (°C) -40 to 85
Channels 1
Output Discharge no
VCTL Function no

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