Preliminary Datasheet
HIGH SPEED, EXTREMELY LOW NOISE LDO REGULATOR
General Description
The AP2121 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 and a chip enable circuit
(5-pin products only).
The AP2121 series feature high ripple rejection, low
dropout voltage, low noise, high output voltage accu-
racy, and low current consumption which make them
ideal for use in various battery-powered devices.
The AP2121 series have 1.5V, 1.8V, 2.5V, 2.8V, 3.0V,
3.2V and 3.3V versions.
The AP2121 are available in standard SOT-23-3 and
SOT-23-5 packages.
AP2121
Features
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Low Dropout Voltage at I
OUT
=100mA: 150mV
Typical (Except 1.5V Version)
Low Standby Current: 0.1µA Typical
Low Quiescent Current: 25µA Typical
High Ripple Rejection: 70dB Typical（f=10kHz）
Maximum Output Current: More Than 150mA
(300mA Limit)
Extremely Low Noise: 30µVrms (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-23-3
SOT-23-5
Figure 1. Package Types of AP2121
Mar. 2007 Rev. 1. 4
1
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
