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AP1121BS (Obsolete)

Dual 1A Low Dropout Positive Regulator

Datasheet

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Description

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.

Feature(s)

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

Application(s)

PC peripheral
Communication

Specifications & Technical Documents

Product Parameters

Accuracy 25C	2%
Channels	2
Compliance (Only Automotive Supports PPAP)	Standard
Features	High current
Fixed Vout (V)	1.8, 3.3
I_OUT	1
Iout (A)	1
I_{Q (mA)}	-
Output Discharge	no
Output options	Fixed
PSRR	60 @ 120Hz
VCTL Function	no
VDROPOUT (Max) (V) at Max Current and Max Ouput Voltage	1.4
Vin (Max) (V)	18
Vin (Min) (V)	4
V_OUT	1.8, 3.3
Vout (max)	3.3
Vout (min)	1.8

Technical Documents

Recommended Soldering Techniques

TN1.pdf

RoHS CofC

RoHSFile

Purchase & Availability

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-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products