CM3102
Micropower 1.2V/150mA CMOS LDO Regulator
with Power Good
Features
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1-5ms Power Good (PG) control signal
Regulated 1.2V output
150mA output current
Low quiescent operating current (90µA typical)
"Zero" disable mode current
Foldback current limiting protection
Thermal shutdown protection
Stable with low-ESR capacitors
SOT23-5 package
"MIC5258" pinout
Lead-free version available
Product Description
The CM3102 is a low quiescent current (90uA) regula-
tor that delivers up to 150mA of load current at a fixed
1.2V output. In addition, the CM3102 features a Power
Good output signal (PG) that goes open drain 1 to 5
ms after the output voltage has exceeded typically 93%
of its nominal level.
A dedicated control input (EN, Active High) has been
included for power-up sequencing flexibility. When this
input is taken low, the regulator is disabled. In this
state, the supply current will drop to near zero. An inter-
nal discharge MOSFET resistance (500Ω) will force the
output to ground whenever the device has been shut-
down.
The CM3102 is fully protected, offering both overload
current limiting and high temperature thermal shut-
down.
Available in a tiny SOT23 package, the device is ideal
for space critical applications.
The CM3102 is available with optional lead-free finish-
ing.
Applications
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Pentium
4 Motherboards
Processor Power-up Sequencing
Desktop, Notebook and Palmtop Computers
PC Cards
Peripheral Adapter Cards
Pentium
4 Motherboard
Application Circuit
CM3102-12Sx
10Ω
Simplified Electrical Schematic
1.2V
VCC3
IN
EN
GND
.1
µ
F*
OUT
PG
VCCVID
PG
IN
1.2V/150mA
OUT
EN
.1
µ
F
+
V
REF
1.2V
* Input capacitor optional.
-
Typical Application Circuit
47kΩ
+
-
CM3102-12Sx
V
REF
X 0.93
2.5ms
PG
V
IN
EN
1
µ
F*
GND
IN
EN
GND
OUT
PG
1
µ
F
V
OUT
1X
PG
GND
* Input capacitor optional.
© 2004 California Micro Devices Corp. All rights reserved.
01/20/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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Fax: 408.263.7846
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www.calmicro.com
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CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
