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AP2128

300MA High Speed, Extremely Low Noise CMOS LDO Regulator

Datasheet

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Description

The AP2128 series are positive voltage regulator ICs fabricated by CMOS process. The AP2128 provides two kinds of output voltage operation modes for setting the output voltage. Fixed output voltage mode senses the output voltage on VOUT, adjustable output voltage mode needs two resistors as a voltage divider. The AP2128 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. AP2128 have 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, 3.3V, 3.9V, 4.2V, 4.75V, 5.2V fixed voltage versions and 0.8V to 5.5V adjustable voltage version.

Feature(s)

· Wide Operating Voltage: 2.5V to 6V · Low Dropout Voltage:170mV@300mA for VOUT=3.3V, 140mV@300mA for VOUT=5.2V · High Output Voltage Accuracy: ±2% · High Ripple Rejection: 68dB@ f=1kHz, 54dB@ f=10kHz · Low Standby Current: 0.1μA · 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

Application(s)

· Datacom · Notebook Computers · Mother Board

Specifications & Technical Documents

Product Parameters

Iq (typ) (µA)	60
Iq (max) (µA)	90
Operating Ambient Temperature (°C)	-40 to 85
AEC Qualified	No
Compliance (Only Automotive Supports PPAP)	Standard
Type	LDO
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, 3.9, 4.2, 4.75, 5.2
Adjustable VFB (V)	0.8
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
Enable Active	Yes (High)
Channels	1
Output Discharge	Yes
Power Good	No
Reverse Protection	No
VCTL Function	No

Technical Documents

Recommended Soldering Techniques

TN1.pdf

Purchase & Availability

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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-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
PCN-2709	2025-01-07	2025-04-07	Additional Wafer Source (GFAB), Die Revision, Data Sheet Change and Additional Bill of Materials (BOM)