PRELIMINARY
CM3112
150mA/1.2V CMOS LDO Regulator
with Power Good
Features
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LDO regulator with Power Good
No capacitor required on the LDO output
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
SOT23-5 package
Micrel MIC5258, MIC5268 compatible pinout
Lead-free version available
Product Description
The CM3112-12 is a low quiescent current (90uA) reg-
ulator that delivers up to 150mA of load current at a
fixed 1.2V output. All the necessary circuitry has been
included to deliver a 50Ω power good signal (open
drain) which remains for 5ms after the output has
exceeded 90% (typ) 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 (500Ω) resistance will force the
output to ground whenever the device has been shut-
down.
The CM3112-12 is fully protected, offering both over-
load current limiting and high temperature thermal
shutdown.
Housed in a tiny SOT23 package, the device is ideal for
space critical applications and is also available with
optional lead-free finishing.
Applications
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Pentium
4 Motherboards
PC Cards
Peripheral Adapter Cards
Typical Application Circuit
Simplified Electrical Schematic
IN
1.2V/150mA
OUT
1kΩ
EN
CM3112-12
V
IN
EN
0.1
µ
F*
GND
IN
EN
GND
0.1
µ
F*
OUT
PG
V
OUT
PG
V
REF
1.2V
+
-
+
-
V
REF
X 0.93
2.5ms
PG
1X
* Optional
GND
© 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 ]
