Data Sheet
300mA HIGH SPEED, EXTREMELY LOW NOISE CMOS LDO REGULATOR
AP2125
General Description
The AP2125 series are 300mA, positive voltage regu-
lator 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 rejec-
tion, low dropout voltage, low noise, high output volt-
age 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 and SC-82
packages as well as industry standard SOT-23-3 and
SOT-23-5 packages.
Features
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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
Applications
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CDMA/GSM Cellular Handsets
Battery-powered Equipments
Laptops, Palmtops, Notebook Computers
Hand-held Instruments
PCMCIA Cards
Portable Information Appliances
SOT-23-3
SOT-23-5
SC-70-5
SC-82
Figure 1. Package Types of AP2125
May. 2010 Rev. 1. 4
1
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
