Data Sheet
HIGH SPEED, EXTREMELY LOW NOISE LDO REGULATOR
General Description
The AP2120 series are positive voltage regulator ICs
fabricated by CMOS process. Each of these ICs con-
sists of a voltage reference, an error amplifier, a resis-
tor network for setting output voltage, a current limit
circuit for current protection.
The AP2120 series feature high supply voltage 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
devices.
The AP2120 series have 1.2V, 1.3V, 1.5V, 1.8V, 2.5V,
2.8V, 3.0V, 3.2V, 3.3V and 5.0V versions.
The AP2120 are available in standard SOT-23 package.
AP2120
Features
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Low Dropout Voltage at I
OUT
=100mA: 200mV
Typical (Except 1.2V, 1.3V and 1.5V Versions)
Low Quiescent Current: 25µA Typical
High Ripple Rejection: 65dB Typical
（f=1kHz）
Output Current: More Than 150mA (250mA
Limit)
Extremely Low Noise: 15µVrms@V
OUT
=1.2V,
1.3V, 1.5V (10Hz to 100kHz)
Excellent Line Regulation: 4mV Typical
Excellent Load Regulation: 12mV Typical
High Output Voltage Accuracy:
±2%
Excellent Line Transient Response and Load
Transient Response
Compatible with Low ESR Ceramic Capacitor (as
Low as 1µF)
Applications
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Mobile Phones, Cordless Phones
Wireless Communication Equipment
Portable Games
Cameras, Video Recorders
Sub-board Power Supplies for Telecom Equip-
ment
Battery Powered Equipment
SOT-23
Figure 1. Package Types of AP2120
Nov. 2009 Rev. 1. 0
1
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
