CALIFORNIA MICRO DEVICES
CMPWR130
300mA SmartOR
TM
Regulator with V
AUX
Drive
Features
• Automatic detection of V
CC
input supply
• Glitch-free output during supply transitions
• Built-in hysteresis during supply selection
• 300mA output maximum load current
• Overload current protection
• Short circuit current protection
• Operates from either V
CC
or V
OUT
• 8-pin SOIC package
Applications
• PCI adapter cards
• Network Interface Cards (NIC’s)
• Dual power systems
• Systems with standby capabilities
Product Description
The SmartOR
TM
CMPWR130 is a low dropout regulator
that delivers up to 300mA of load current at a fixed 3.3V
output. An internal threshold level (TYP 4.1V) is used to
prevent the regulator from being operated below dropout
voltage. The device continuously monitors the input
supply and will automatically 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 AND APPLICATION CIRCUIT
MGSF1PO2ELT1
Top View
V
CC
NC
NC
GND
1
2
3
4
8
7
6
5
DRIVE
V
OUT
V
OUT
NC
V
CC
5V
+
–
V
AUX
3.3V
GND
C
IN
1µF
CMPWR130
V
CC
+
DRIVE
V
OUT
GND
+
V
OUT
3.3V
300mA
C
OUT
4µF
GND
+
–
CMPWR130
8-Pin SOIC
Pin Diagram
Typical Application Circuit
STANDARD PART ORDERING INFORMATION
Package
Pins
8
Style
SOIC
Ordering Part Number
Tubes
Tape & Reel
CMPWR130S/T
CMPWR130S/R
Part Marking
CMPWR130S
C1670101
© 2001 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corp
215 Topaz Street, Milpitas, California 95035
3/5/2001
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
CALIFORNIA MICRO DEVICES
ABSOLUTE MAXIMUM RATINGS
Parameter
ESD Protection (HBM)
V
CC,
V
OUT
Voltages
Drive Logic Voltage
Temperature: Storage
Operating Ambient
Operating Junction
Power Dissipation
(Note 1)
Rating
2000
6.0, GND –0.5
V
CC
+ 0.5, GND –0.5
–40 to 150
0 to 70
0 to 125
0.6
Unit
V
V
V
˚
C
˚
C
˚
C
W
CMPWR130
OPERATING CONDITIONS
Parameter
V
CC
Temperature (Ambient)
Load Current
C
EXT
Range
5 ± 0.5
0 to 70
0 to 300
4.7 ± 20%
Unit
V
˚
C
mA
µF
ELECTRICAL OPERATING CHARACTERISTICS
(over operating conditions unless specified otherwise)
Symbol
V
OUT
V
CCSEL
V
CCDES
V
CCHYST
I
S/C
I
RCC
V
R LOAD
V
R LINE
ICC
Parameter
Regulator Output Voltage
Select Voltage
Deselect Voltage
Hysteresis Voltage
Short Circuit Output Current
V
CC
Pin Reverse Leakage
Load Regulation
Line Regulation
Quiescent Supply Current
Conditions
0mA < I
LOAD
< 300mA
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
= 30 to 300mA
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 Current
(Note 3)
V
CCSEL
>
V
CC
(Regulator Disabled)
V
CC
= 5V, I
LOAD
= 5mA
V
CC
= 5V, I
LOAD
= 300mA
R
OH
R
OL
Drive Pull-up Resistance
Drive Pull-down Resistance
R
PULLUP
to V
CC,
V
CC
> V
CCSEL
R
PULLDOWN
to GND, V
CCDES
> V
CC
310
2
50
50
0.6
0.2
0.01
0.2
0.6
0.7
4.0
0.1
0.02
0.4
0.8
1.4
8.0
0.4
0.8
50
3.90
MIN
3.10
TYP
3.30
4.30
4.10
0.20
MAX
3.50
4.45
UNIT
V
V
V
V
mA
µA
mV
mV
mA
mA
mA
mA
mA
mA
kΩ
kΩ
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 multilayer 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
3/5/2001
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
(4.30V TYP), the internal
regulator (300mA 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 0.6mA when the
regulator is enabled, which reduces to 0.2mA 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 200mV 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
CMPWR130
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. This
current that flows in the ground connection is very low
(TYP 550µA) 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 4.7µF 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 the auxiliary remains
isolated during normal regulator operation.
The output current sinking ability of this logic signal is
equivalent to a 100W resistor. The current sourcing
ability is equivalent to a 4kΩ resistor.
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
Pin
1
6, 7
8
4
2, 3, 5
Symbol
V
CC
V
OUT
DRIVE
GND
NC
Description
Positive (5V) supply input for regulator. (V
CC
> V
CCSEL
)
Continuous output voltage (3.3V) is derived from either the internal regulator or low impedance
switch connected to the auxiliary supply input.
Output drive signal to control external MOSFET switch
Negative reference for all voltages
Unconnected pin which is electrically isolated from internal circuitry.
V
CC
DRIVE
+
–
V
DESELECT
4.1V
GND
V
REF
3.3V
+
–
ENABLE
V
OUT
3.3V
300mA
Simplified Electrical Schematic
© 2001 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corp
215 Topaz Street, Milpitas, California 95035
3/5/2001
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
3
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