Diodes Incorporated
SO 8

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AP1121AS (Obsolete)

Dual 1A Low Dropout Positive Regulator

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AP1121 is a low dropout positive regulator to provide 1A output current capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications such as high-speed bus termination and low current 3.3V/2.5V or 3.3V/1.8V logic supply. AP1121 is a guaranteed to have <1.3V dropout at full load current making it ideal to provide well regulated outputs dual channels with up to 18V input supply.


  • 1.3V maximum dropout at full load current
  • Fast transient response
  • Output current limiting for each channel
  • Built-in thermal shutdown for each channel
  • Good noise rejection
  • Dual output ch1 = 3.3V, ch2 = 2.5V (ch2 = 1.8V for version B)
  • SO-8: Available in “Green” Molding Compound (No Br, Sb)
  • Lead Free Finish/ RoHS Compliant


  • PC peripheral
  • Communication

Product Specifications

Product Parameters

Accuracy 25C 2%
Automotive Complianat and PPAP capable no
Channels 2
Compliance (Only Automotive supports PPAP) Standard
Features High current
Fixed Vout (V) 2.5, 3.3
Fixed Vout(V) 2.5, 3.3
Fixed Vout(V) 2.5,3.3
Iout (A) 1
IQ (mA) -
Iq (max) (µA) 10000
Iq (max) (µA) 10000
Iq (max) (µA) 10000
Iq (typ) (µA) 5000
Iq (typ) (µA) 5000
Operating Temperature (Ambient) (°C) -40 to 85
Output Discharge no
Output options Fixed
PSRR 60 @ 120Hz
VCTL Function no
VDROPOUT (Max) 1.4
VDROPOUT (Max) (V) at Max Current and Max Ouput Voltage 1.4
VDROPOUT (Max) (V) at Max Current and Max Voltage 1.4
VDROPOUT (Max)(V) at Max Current and Max Voltage 1.4
VIN (Max) 18
Vin (Max) (V) 18
VIN (Min) 4
Vin (Min) (V) 4
VOUT 2.5, 3.3
Vout (max) 3.3
Vout (min) 2.5

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