Preliminary Datasheet
150mA RF ULDO REGULATOR
AP2201
General Description
Features
The AP2201 is a 150mA output current fixed voltage
regulator designed to provide very low noise (45µVrms
at 80Hz-100KHz), ultra low dropout voltage (typically
165mV at 150mA), very low quiescent current (1µA
maximum) and excellent power supply ripple rejection
(PSRR 75dB at 100Hz) in battery powered applica-
tions, such as handsets and PDAs and in noise sensitive
applications, such as RF electronics.
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Up to 150mA Regulator Output
Low Quiescent Current
Low Dropout Voltage: VD=165mV at 150mA
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High Precision Output Voltage: ±1%
Output Noise: 45µVrms at 80Hz-100KHz
Good Ripple Rejection Ability: 75dB at 100Hz
and IOUT=100µA
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Tight Load and Line Regulation
Low Temperature Coefficient
Over Current Protection
Thermal Protection
Reverse-battery Protection
Zero Off-mode Current
Logic-controlled Enable
The AP2201 also features individual logic compatible
enable/shutdown control inputs, a low power shutdown
mode for extended battery life, over current protection,
over temperature protection, as well as reversed-bat-
tery protection.
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The output capacitor of 1.0µF minimum and 2.2µF
minimum near its pin are recommended when CBYP is
Applications
not used and when CBYP is 470pF respectively. The
output capacitor should have 5Ω or less ESR, tantalum
or aluminium electrolytic capacitors are adequate.
Bypass capacitor is connected to the internal voltage
reference to quiet noise. Its recommended value is
from 470pF to 1nF. If output noise is not a major con-
cern and rapid turn-on is necessary, omit CBYP and
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Cellular Phones
Cordless Phones
Digital Still Cameras
Wireless Communicators
PDAs / Palmtops
leave BYP open.
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PC Mother Board
Consumer Electronics
The AP2201 has 2.6V, 2.8V and 3.0V versions now.
The AP2201 is available in space saving 5-pin SOT-
23-5 package.
AP2201-2.8
VIN=3.8V
VOUT=2.8V
+
VOUT
VIN
VOUT
VIN
EN
COUT
CIN
1.0µF
BYP
GND
2.2µF
tantalum
CBYP
470pF
SOT-23-5
Figure 1. Typical Application of AP2201
Figure 2. Package Type of AP2201
BCD Semiconductor Manufacturing Limited
Jun. 2005 Rev. 1. 0
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