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LDO Regulator. CM3112 Datasheet

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LDO Regulator. CM3112 Datasheet
















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Part

CM3112

Description

150mA/1.2V CMOS LDO Regulator



Feature


PRELIMINARY CM3112 150mA/1.2V CMOS LDO R egulator with Power Good Features • L DO regulator with Power Good • No cap acitor required on the LDO output • P ower Good (PG) control signal • Regul ated 1.2V output www.DataSheet4U.com 150mA output current • Low quiescen t operating current (90µA typical) • "Zero" disable mode current • Foldba ck current limiting protection • Th.
Manufacture

California Micro Devices

Datasheet
Download CM3112 Datasheet


California Micro Devices CM3112

CM3112; ermal shutdown protection • SOT23-5 pa ckage • Micrel MIC5258, MIC5268 compa tible pinout • Lead-free version avai lable Product Description The CM3112-1 2 is a low quiescent current (90uA) reg ulator that delivers up to 150mA of loa d current at a fixed 1.2V output. All t he necessary circuitry has been include d to deliver a 50Ω power good signal (open drain) which remains.


California Micro Devices CM3112

for 5ms after the output has exceeded 9 0% (typ) of its nominal level. A dedica ted control input (EN, Active High) has been included for power-up sequencing flexibility. When this input is taken l ow, the regulator is disabled. In this state, the supply current will drop to near zero. An internal discharge MOSFET (500Ω) resistance will force the out put to ground whenev.


California Micro Devices CM3112

er the device has been shutdown. The CM3 112-12 is fully protected, offering bot h overload current limiting and high te mperature thermal shutdown. Housed in a tiny SOT23 package, the device is idea l for space critical applications and i s also available with optional lead-fre e finishing. Applications • • • Pentium 4 Motherboards PC Cards Peri pheral Adapter Cards Typi.





Part

CM3112

Description

150mA/1.2V CMOS LDO Regulator



Feature


PRELIMINARY CM3112 150mA/1.2V CMOS LDO R egulator with Power Good Features • L DO regulator with Power Good • No cap acitor required on the LDO output • P ower Good (PG) control signal • Regul ated 1.2V output www.DataSheet4U.com 150mA output current • Low quiescen t operating current (90µA typical) • "Zero" disable mode current • Foldba ck current limiting protection • Th.
Manufacture

California Micro Devices

Datasheet
Download CM3112 Datasheet




 CM3112
150mA/1.2V CMOS LDO Regulator
with Power Good
PRELIMINARY
CM3112
Features
• LDO regulator with Power Good
• No capacitor required on the LDO output
• Power Good (PG) control signal
• Regulated 1.2V output
www.DataSheet4U.c1o5m0mA 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
Applications
• Pentium4 Motherboards
• PC Cards
• Peripheral Adapter Cards
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 50power 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 (500) 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.
Typical Application Circuit
VIN
EN
GND
1k
CM3112-12
IN OUT
EN PG
GND
0.1µF*
* Optional
Simplified Electrical Schematic
IN
EN
VOUT
PG
0.1µF*
VREF
1.2V
+
-
+
2.5ms
-
VREF X 0.93
1X
1.2V/150mA
OUT
PG
GND
© 2004 California Micro Devices Corp. All rights reserved.
01/20/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L Tel: 408.263.3214 L Fax: 408.263.7846 L www.calmicro.com
1




 CM3112
PACKAGE / PINOUT DIAGRAM
Top View
IN 1
5
OUT
GND
2
www.DataSheet4U.com
Note: This drawing is not to scale.
EN 3
4
5-pin SOT23
PG
PRELIMINARY
CM3112
PIN DESCRIPTIONS
PIN NAME DESCRIPTION
1 IN Positive input voltage for the regulator. The internal loading on this input is typically 300µA when-
ever the regulator is enabled, and less than 10µA when the regulator is disabled. If the IN pin is
within a few inches of the main input filter, a capacitor may not be necessary. Otherwise an input fil-
ter capacitor (CIN) of 0.1uF to 1uF will ensure adequate filtering.
2 GND The negative reference for all voltages.
3 EN Enable/shutdown input. When EN is asserted high (VEN 1.6V), the regulator is enabled. When EN
is asserted low (VEN 0.4V), the regulator’s series pass transistor is forced into a high impedance
mode and an internal discharge resistance (500) is applied to the output to quickly reduce the out-
put voltage to 0 volts.
4 PG Power Good output. This is an open drain output and functions as a supply voltage supervisor for
the output voltage. It is asserted low when the output falls below 84% of its nominal value. This out-
put becomes inactive when (EN > 1.5V), (2.5V < VIN < 5.5V) and (VOUT > 97% of VOUTNOM), all of
which are valid for more than 1-10ms.
5 OUT The regulated voltage output. Although an output capacitor is not necessary for stable regulator
operation, a optional 0.1uF capacitor can be used to provide an added measure of output stability.
Ordering Information
PART NUMBERING INFORMATION
Regulator
CM3112-12
Pins
5
Package
SOT23-5
Standard Finish
Ordering Part
Number1
Part Marking
CM3112-12ST
FA12
Lead-free Finish
Ordering Part
Number1
Part Marking
CM3112-12SO
FB12
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
© 2004 California Micro Devices Corp. All rights reserved.
2 430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L Tel: 408.263.3214 L Fax: 408.263.7846 L www.calmicro.com 01/20/04




 CM3112
PRELIMINARY
CM3112
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
RATING
UNITS
ESD Protection (HBM)
+2000
V
Pin Voltages
VIN
VOUT
www.DataSheet4U.com VEN
Storage Temperature Range
[GND - 0.6] to +6.0
[GND - 0.6] to [VIN+0.6]
[GND - 0.6] to [VIN+0.6]
-40 to +150
V
V
V
°C
Operating Temperature Range
Ambient
Junction
0 to +70
0 to +150
°C
°C
Power Dissipation (See note 1)
Internally Limited
W
Note 1: The power rating is based on a printed circuit board heat spreading capability equivalent to 2 square inches of copper con-
nected to the GND pins. Typical multi-layer boards using power plane construction will provide this heat spreading ability
without the need for additional dedicated copper area. Please consult with factory for thermal evaluation assistance.
STANDARD OPERATING CONDITIONS
PARAMETER
VIN
Ambient Operating Temperature Range
Load Current
COUT
VALUE
2.5 to 5.5
0 to +70
0 to 150
0 to 10
UNITS
V
°C
mA
µF
© 2004 California Micro Devices Corp. All rights reserved.
01/20/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L Tel: 408.263.3214 L Fax: 408.263.7846 L www.calmicro.com
3




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