AP2125
300mA, HIGH SPEED, EXTREMELY LOW NOISE CMOS LDO REGULATOR
Description Pin Assignments
The AP2125 series are 300mA, positive voltage regulator ICs (Top View)
fabricated by CMOS process.
V
IN
3
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
1 2
voltage, low noise, high output voltage accuracy and low current
GND V
OUT
consumption which make them ideal for use in various battery-
powered apparatus.
SOT-23-3
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 (Top View)
standard SOT-23-3 and SOT-23-5 packages.
V 1 5 V
IN OUT
Features
GND 2
Excellent Ripple Rejection: 70dB Typical (1.8V Version)
CE
Low Dropout Voltage: 65mV (I =100mA, 3.3V Version) 3 4 NC
OUT
Low Standby Current: 0.01A Typical
Low Quiescent Current: 60A Typical
Extremely Low Noise: 50Vrms Typical
SOT-23-5/SC-70-5
Maximum Output Current: 300mA (Min.)
High Output Voltage Accuracy: 2%
Compatible with Low ESR Ceramic Capacitor
Excellent Line/Load Regulation
Applications
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. Green Device (Note 3)
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
AP2125
Typical Applications Circuit
Pin Descriptions
Pin Number
Pin Name Function
SOT-23-3 SOT-23-5/SC-70-5
3 1 V Input voltage
IN
1 2 GND Ground
Active high enable input pin. Logic high=enable, logic low =
3 CE
shutdown
4 NC No connection
2 5 V Regulated output voltage
OUT
2 of 25
AP2125 May 2016
Diodes Incorporated
www.diodes.com
Document number: DS38144 Rev. 2 - 2
ADVANCED INFORMATION