Data Sheet
300mA HIGH SPEED, EXTREMELY LOW NOISE CMOS LDO REGULATOR
AP2128
General Description
The AP2128 series are positive voltage regulator ICs
fabricated by CMOS process. The AP2128 provides
two kinds of output voltage operation modes for
setting the output voltage. Fixed output voltage mode
senses the output voltage on V
OUT
, adjustable output
voltage mode needs two resistors as a voltage divider.
The AP2128 series have features of low dropout
voltage, low noise, high output voltage accuracy, and
low current consumption which make them ideal for
use in various battery-powered devices.
AP2128 have 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.0V,
3.3V, 3.9V, 4.2V, 4.75V, 5.2V fixed voltage versions
and 0.8V to 5.5V adjustable voltage version.
AP2128 series are available in SOT-23-5 package.
Features
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Wide Operating Voltage: 2.5V to 6V
Low Dropout Voltage:170mV@300mA for
V
OUT
=3.3V, 140mV@300mA for V
OUT
=5.2V
High Output Voltage Accuracy:
±2%
High Ripple Rejection:
68dB@ f=1kHz, 54dB@ f=10kHz
Low Standby Current: 0.1µA
Low Quiescent Current: 60µA Typical
Low Output Noise: 60µVrms@V
OUT
=0.8V
Short Current Limit: 50mA
Over Temperature Protection
Compatible with Low ESR Ceramic Capacitor:
1µF for C
IN
and C
OUT
Excellent Line/Load Regulation
Soft Start Time: 50µs
Auto Discharge Resistance: R
DS(ON)
=60Ω
Applications
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Datacom
Notebook Computers
Mother Board
SOT-23-5
Figure 1. Package Type of AP2128
Sept. 2010 Rev. 2.0
1
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
