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Datasheet> All Categories > Power/power management> The power supply circuit> CMPWR120S/R
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CMPWR120S/R

Description
Fixed Positive LDO Regulator, 3.3V, PDSO8, SOIC-8
CategoryPower/power management    The power supply circuit   
File Size115KB，8 Pages
ManufacturerCalifornia Micro Devices
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CMPWR120S/R Overview

Fixed Positive LDO Regulator, 3.3V, PDSO8, SOIC-8

CMPWR120S/R Parametric

Parameter NameAttribute value
MakerCalifornia Micro Devices
Parts packaging codeSOIC
package instructionSOP,
Contacts8
Reach Compliance Codeunknown
ECCN codeEAR99
Maximum input voltage5.5 V
Minimum input voltage4.5 V
JESD-30 codeR-PDSO-G8
length4.9 mm
Number of functions1
Number of terminals8
Working temperatureTJ-Max125 °C
Working temperature TJ-Min
Maximum output current 10.25 A
Maximum output voltage 13.465 V
Minimum output voltage 13.135 V
Nominal output voltage 13.3 V
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Certification statusNot Qualified
Regulator typeFIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
Maximum seat height1.75 mm
surface mountYES
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
width3.995 mm

CMPWR120S/R Preview

CALIFORNIA MICRO DEVICES
CMPWR120
250mA / 3.3V SmartOR™ POWER REGULATOR
Features
• Automatic detection of V
CC
input supply
• Drive output logic to control external switch
• Glitch-free output during supply transitions
• 250mA output maximum load current
• Built-in hysteresis during supply selection
• Controller operates from either V
CC
or V
OUT
• 8-pin SOIC narrow package
Applications
• PCI adapter cards
• Network Interface Cards (NIC’s)
• Dual power systems
• Systems with standby capabilities
• See Application Note AP211
Product Description
California Micro Devices’ SmartOR
TM
CMPWR120 is a
low dropout regulator that delivers up to 250mA of load
current at a fixed 3.3V output. An internal threshold level
(typically 4.1V) is used to prevent the regulator from
being operated below dropout voltage. The device
continuously monitors the input supply and will automati-
cally disable the regulator when V
CC
falls below the
threshold level. When the regulator is disabled, the
control signal “Drive” (Active Low) is enabled, which
allows an external PMOS switch to power the load from
an auxiliary 3.3V supply.
When V
CC
is restored to a level above the select thresh-
old, the control signal for the external PMOS switch is
disabled and the regulator is once again enabled.
All the necessary control circuitry needed to provide a
smooth and automatic transition between the supplies
has been incorporated. This allows V
CC
to be dynamically
switched without loss of output voltage.
PIN DIAGRAM, APPLICATION CIRCUIT, AND ELECTRICAL SCHEMATIC
MGSF1P02ELT1
Top View
+
V
CC
NC
NC
GND
1
2
3
4
8
7
6
5
DRIVE
–
V
AUX
3.3V
GND
CMPWR120
V
CC
+
V
OUT
V
OUT
NC
+
DRIVE
V
OUT
GND
+
C
IN
1µF
V
OUT
3.3V
200mA
C
OUT
4µ7
GND
CMPWR120
8-Pin SOIC Narrow
V
CC
–
5V
Pin Diagram
Typical Application Circuit
V
CC
DRIVE
+
DESELECT
4.1V
GND
–
V
REF
3.3V
+
–
ENABLE
V
OUT
3.3V
200mA
Simplified Electrical Schematic
©2001 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corp.
C0610999
215 Topaz Street, Milpitas, California 95035

1/26//2001
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
CALIFORNIA MICRO DEVICES
ABSOLUTE MAXIMUM RATINGS
Parameter
ESD Protection (HBM)
V
CC
Input Voltage
Drive Logic Voltage
Storage Temperature Range
Operating Ambient
Operating Junction
Power Dissipation: SOIC
(Note 1)
Rating
2000
6, GND –0.5
V
CC
0.5, GND –0.5
–40 to 150
0 to 70
0 to 125
0.5
Unit
V
V
V
CMPWR120
˚
C
˚
C
˚
C
W
OPERATING CONDITIONS
Parameter
V
CC
Temperature (Ambient)
Load Current
C
EXT
Range
5 ± 0.5
0 to 70
0 to 250
4.7 ± 10%
Unit
V
˚
C
mA
µF
ELECTRICAL OPERATING CHARACTERISTICS
(over operating conditions unless specified otherwise)
Symbol
V
OUT
I
OUT
V
CCSEL
V
CCDES
V
CCHYST
I
S/C
I
RCC
V
R LOAD
V
R LINE
I
CC
Parameter
Regulator Output Voltage
Regulator Output Current
Select Voltage
Deselect Voltage
Hysteresis Voltage
Short Circuit Output Current
V
CC
Pin Reverse Leakage
Load Regulation
Line Regulation
Quiescent Supply Current
Regulator Enabled
Regulator Disabled
Hysteresis
(Note 2)
V
CC
= 5V, V
OUT
= 0V
V
OUT
= 3.3V, V
CC
= 0V
V
CC
= 5V, I
LOAD
= 20 to 250mA
V
CC
= 4.5V to 5.5V, I
LOAD
= 5mA
V
CC
> V
CCSEL
, I
LOAD
= 0mA
V
CCDES
> V
CC >
V
OUT
V
OUT
> V
CC
I
GND
Ground Pin Current
(Note 3)
V
CCSEL
(Regulator Disabled)
V
CC
= 5V, I
LOAD
= 5mA
V
CC
= 5V, I
LOAD
= 250mA
R
OH
R
OL
t
DH
t
DL
Drive Pull-up Resistance
Drive Pull-down Resistance
Drive High Delay
Drive Low Delay
R
PULLUP
to V
CC,
V
CC
> V
CCSEL
R
PULLDOWN
to GND, V
CCDES
> V
CC
C
DRIVE
= 1nF V
CC
t
RISE
< 100ns
,
C
DRIVE
= 1nF V
CC
t
FALL
< 100ns
,
Conditions
250mA < I
LOAD
< 0mA
MIN
3.135
250
3.90
3.90
3.90
4.35
4.10
0.25
1200
5
35
2
1.0
0.15
0.01
0.15
1.0
1.2
100
200
1.0
0.2
3.0
0.25
0.02
0.30
2.5
3.0
400
400
50
4.45
4.45
4.45
TYP
3.30
MAX
3.465
UNIT
V
mA
V
V
V
mA
µA
mV
mV
mA
mA
mA
mA
mA
mA
Ω
Ω
µs
µs
Note 1:
The power rating is based on a printed circuit board heat spreading capability equivalent to 2 square inches of copper connected 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.)
Note 2:
The hysteresis defines the maximum level of acceptable disturbance on V
CC
during switching. It is recommended that the V
CC
source impedance be kept below 0.25Ω to ensure the switching disturbance remains below the hysteresis during select/deselect
transitions. An input capacitor may be required to help minimize the switching transient.
Note 3:
Ground pin current consists of controller current (0.15mA) and regulator current if enabled. The controller always draws 0.15mA from
either V
CC
or V
OUT
, whichever is greater. All regulator current is supplied exclusively from V
CC
. At high load currents a small increase
occurs due to current limit protection circuitry.
©2001 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corp.
2
215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1/26/2001
CALIFORNIA MICRO DEVICES
Interface Signals
V
CC
is the power source for the internal regulator and is
monitored continuously by an internal controller circuit.
Whenever V
CC
exceeds V
CCSEL
(4.35V TYP), the internal
regulator (250mA MAX) will be enabled and deliver a
fixed 3.3V at V
OUT
. When V
CC
falls below V
CCDES
(4.10V
TYP) the regulator will be disabled.
Internal loading on this pin is typically 1.0mA when the
regulator is enabled, which reduces to 0.15mA whenever
the regulator is disabled. If V
CC
falls below the voltage on
the V
OUT
pin the V
CC
loading will further reduce to only a
few microamperes.
During a V
CC
power up sequence, there will be an
effective step increase in V
CC
line current when the
regulator is enabled. The amplitude of this step increase
will depend on the DC load current and any necessary
current required for charging/discharging the load
capacitance. This line current transient will cause a
voltage disturbance at the V
CC
pin. The magnitude of the
disturbance will be directly proportional to the effective
power supply source impedance being delivered to the
V
CC
input.
To prevent chatter during Select and Deselect transi-
tions, a built-in hysteresis voltage of 250mV has been
incorporated. It is recommended that the power supply
connected to the V
CC
input should have a source resis-
tance of less than 0.25Ω to minimize the event of chatter
during the enabling/disabling of the regulator.
An input filter capacitor in close proximity to the V
CC
pin
will reduce the effective source impedance and help
minimize any disturbances. If the V
CC
pin is within a few
inches of the main input filter, a capacitor may not be
CMPWR120
necessary. Otherwise an input filter capacitor in the
range of 1µF to 10µF will ensure adequate filtering.
GND
is the negative reference for all voltages. The
current that flows in the ground connection is very low
(TYP 1.0mA) and has minimal variation over all load
conditions.
V
OUT
is the regulator output voltage connection used to
power the load. An output capacitor of ten microfarads is
used to provide the necessary phase compensation,
thereby preventing oscillation. The capacitor also helps
to minimize the peak output disturbance during power
supply changeover.
When V
CC
falls below V
OUT
, then V
OUT
will be used to
provide the necessary quiescent current for the internal
reference circuits. This ensures excellent start-up
characteristics for the regulator.
DRIVE
is an active LOW logic output intended to be
used as the control signal for driving an external PFET
whenever the regulator is disabled. This will allow the
voltage at V
OUT
to be powered from an auxiliary supply
voltage (3.3V).
The Drive pin is pulled HIGH to V
CC
whenever the
regulator is enabled. This ensures that the auxiliary
remains isolated during normal regulator operation.
Output Current sinking and sourcing ability of this logic
signal is equivalent to 400Ω.
NC
pins are electrically isolated from the internal
circuitry. These pins can be connected to any external
voltage level without impacting the device functionality.
PIN FUNCTIONS
Symbol
V
CC
GND
V
OUT
DRIVE
NC
Negative reference for all voltages
Regulator voltage ouput (3.3V) regulator when V
CC
is present. When V
CC
is not present, the
voltage on V
OUT
is used to bias the internal references.
CMOS Logic Output intended to control external PMOS switch for selecting an auxiliary voltage supply
when V
CC
is not present.
Unconnected pins which are electrically isolated from internal circuitry
Description
Positive supply input for regulator. When V
CC
falls below 4.1V the regulator is disabled.
©2001 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corp.
215 Topaz Street, Milpitas, California 95035

1/26//2001
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
3
CALIFORNIA MICRO DEVICES
Typical DC Characteristics
Unless stated otherwise, all DC characteristics were
measured at room temperature with a nominal V
CC
supply voltage of 5.0V and an output capacitance of
4.7µF. The external PMOS switch was present and
resistive load conditions were used.
With normal production devices, the V
DESELECT
voltage
prevents the regulator from operating in dropout mode.
For the purposes of obtaining full dropout characteristics,
the evaluation test device had access to the
V
DESELECT
voltage. By forcing this voltage artificially low,
full dropout characteristics were obtained.
Dropout Characteristics
of the regulator are shown in
Figure 1. Output regulation under full load conditions is
maintained down the line at voltages of 3.6V.
In normal operation, the regulator is deselected at 4.1V,
which ensures a regulation output droop of less than
20mV is maintained.
3.35
50mA Load
CMPWR120
Ground Current
is shown across the entire range of
load conditions. The ground current has minimal varia-
tion across the range of load conditions and shows only
a slight increase at maximum load. This slight increase
at rated load is due to the current limit protection circuitry
becoming active. See Figure 3.
2.0
1.5
Current (mA)
1.0
0.5
0.0
0
100
200
300
400
500
Load Current (mA)
3.30
VOUT (V)
Figure 3. Ground Current
V
CC
Supply Current
of the device is shown across the
entire V
CC
range for both V
AUX
present (3.3V) and
absent (0V). See Figure 4.
In the absence of V
AUX
, the supply current remains fixed
at approximately 0.15mA until V
CC
reaches the Select
voltage threshold of 4.35V. At this point the regulator is
enabled and a supply current of 1.0mA is conducted.
When V
AUX
is present, the V
CC
supply current is less than
10µA until V
CC
exceeds V
AUX
, at which point V
CC
then
powers the controller (0.15mA). When V
CC
reaches
V
SELECT
, the regulator is enabled.
10,000
3.25
250mA Load
3.20
3.15
3.5
4.0
VCC (V)
4.5
5.0
Figure 1. Dropout Characteristics
Load Regulation
performance is shown from zero to
maximum rated load in Figure 2. A change in load from
10% to 100% of rated, results in an output voltage
change of less than 35mV. This translates into an
effective output impedance of approximately 0.15Ω.
3.40
Supply Current (µA)
1000
3.35
VOUT (V)
V
AUX
= 0V
100
V
AUX
= 3.3V
3.30
3.25
10
1
2
3
VCC (V)
4
5
3.20
0
100
200
300
Load Current (mA)
Figure 4. V
CC
Supply Current (No Load).
Figure 2. Load Regulation
©2001 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corp.
4
215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1/26/2001
CALIFORNIA MICRO DEVICES
Typical Transient Characteristics
The transient characterization test setup shown below
includes the effective source impedance of the V
CC
supply (R
S
). This was measured to be approximately
0.2Ω. It is recommended that this effective source
impedance be no greater than 0.25Ω to ensure that
precise switching is maintained during V
CC
selection and
deselection.
Both the rise and fall times during V
CC
power-up/down
sequencing were controlled at a 20ms duration. This is
considered to represent worst case conditions for most
application circuits.
A maximum rated load current of 250mA was used
during characterization, unless specified otherwise.
During a selection or deselection transition, the DC load
current is switching from V
AUX
to V
CC
and vice versa. In
addition to the normal load current, there may also be an
in-rush current for charging/discharging the load capaci-
tor. The total current pulse being applied to either V
AUX
or
V
CC
is equal to the sum of the DS load and the corre-
sponding in-rush current. Transient currents in excess of
0.5A can readily occur for brief intervals when either
supply commences to power the load.
The oscilloscope traces of V
CC
power-up/down show the
full bandwidth response at the V
CC
and V
OUT
pins under
full load (250mA) conditions.
See Application Note AP211 for more information.
3
Drive
CMPWR120
V
CC
Power-up Cold Start.
Figure 5 shows the output
response during an initial V
CC
power-up with V
AUX
not
present. When V
CC
reaches the select threshold, the
regulator turns on. The uncharged output capacitor
causes maximum in-rush current to flow, resulting in a
large voltage disturbance at the V
CC
pin of about 200mV.
The built-in hysteresis of 250mV ensures the regulator
remains enabled throughout the transient.
Prior to V
CC
reaching an acceptable logic supply level
(2V), a disturbance on the Drive pin can be observed.
Tek
50kS/s
1 Acqs
250mA Load
V
CC
2
V
OUT
Ch1
Ch3
1V
5V
Ch2
1V
M 1ms Ch1
3.5V
Figure 5. V
CC
Power-up Cold Start
V
AUX
3.3V
R
S
0.2Ω
V
CC
5V
TR = 20ms
TF= 20ms
MGSF1P02ELT1
CMPWR120
V
CC
DRIVE
V
OUT
GND
+ C3
0.1µF
C4
4.7µF
(250mA)
13.2Ω
V
OUT
+ C1
4.7µF
C2
0.1µF
GND
Transient Characteristics Test Setup
©2001 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corp.
215 Topaz Street, Milpitas, California 95035

1/26//2001
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
5
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CMPWR120S/R Related Products

CMPWR120S/R CMPWR120S/T
Description Fixed Positive LDO Regulator, 3.3V, PDSO8, SOIC-8 Fixed Positive LDO Regulator, 3.3V, PDSO8, SOIC-8
Maker California Micro Devices California Micro Devices
Parts packaging code SOIC SOIC
package instruction SOP, SOP,
Contacts 8 8
Reach Compliance Code unknown unknown
ECCN code EAR99 EAR99
Maximum input voltage 5.5 V 5.5 V
Minimum input voltage 4.5 V 4.5 V
JESD-30 code R-PDSO-G8 R-PDSO-G8
length 4.9 mm 4.9 mm
Number of functions 1 1
Number of terminals 8 8
Working temperatureTJ-Max 125 °C 125 °C
Maximum output current 1 0.25 A 0.25 A
Maximum output voltage 1 3.465 V 3.465 V
Minimum output voltage 1 3.135 V 3.135 V
Nominal output voltage 1 3.3 V 3.3 V
Package body material PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SOP SOP
Package shape RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE SMALL OUTLINE
Certification status Not Qualified Not Qualified
Regulator type FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
Maximum seat height 1.75 mm 1.75 mm
surface mount YES YES
Terminal form GULL WING GULL WING
Terminal pitch 1.27 mm 1.27 mm
Terminal location DUAL DUAL
width 3.995 mm 3.995 mm

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