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AP2125
Document number: DS38144 Rev. 2 - 2
1 of 25
www.diodes.com
May 2016
© Diodes Incorporated
ADVANCED I NF ORMATION
AP2125
300mA, HIGH SPEED, EXTREMELY LOW NOISE CMOS LDO REGULATOR
Description
The AP2125 series are 300mA, positive voltage regulator ICs
fabricated by CMOS process.
Each of these ICs is equipped with a voltage reference, an error
amplifier, a resistor network for setting output voltage, a chip enable
circuit, a current limit circuit and OTSD (over temperature shut down)
circuit to prevent the IC from over current and over temperature.
The AP2125 series have features of high ripple rejection, low dropout
voltage, low noise, high output voltage accuracy and low current
consumption which make them ideal for use in various battery-
powered apparatus.
The AP2125 have 1.8V, 2.5V, 2.8V, 3.0V, 3.3V, 4.15V and 4.2V fixed
voltage versions.
These ICs are available in tiny SC-70-5 packages as well as industry
standard SOT-23-3 and SOT-23-5 packages.
Features
Excellent Ripple Rejection: 70dB Typical (1.8V Version)
Low Dropout Voltage: 65mV (I
OUT
=100mA, 3.3V Version)
Low Standby Current: 0.01µA Typical
Low Quiescent Current: 60µA Typical
Extremely Low Noise: 50µVrms Typical
Maximum Output Current: 300mA (Min.)
High Output Voltage Accuracy: ±2%
Compatible with Low ESR Ceramic Capacitor
Excellent Line/Load Regulation
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
SOT-23-3
(Top View)
SOT-23-5/SC-70-5
Applications
CDMA/GSM Cellular Handsets
Battery-powered Equipments
Laptops, Palmtops, Notebook Computers
Hand-held Instruments
PCMCIA Cards
Portable Information Appliances
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
3
2
1
V
IN
GND
V
OUT
V
IN
GND
V
OUT
1
2
3 4
5
NC
CE
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