CALIFORNIA MICRO DEVICES
CMPWR150
Pin Diagrams
Top View
n.c.
V
CC
GND
V
OUT
Drive
CMPWR150TO
5-pin TO-263 Package
n.c.
V
CC
V
OUT
Drive
Top View
GND
GND
GND
GND
500mA / 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
500mA output maximum load current
Built-in hysteresis during supply selection
Controller operates from either V
CC
or V
OUT
8-pin SOIC Thermal or 5-pin TO-263 packages
Applications
PCI adapter cards
Network Interface Cards (NICs)
Dual power systems
Systems with standby capabilities
See Application Note AP-211
Product Description
California Micro Devices SmartOR
TM
CMPWR150 is a
low dropout regulator that delivers up to 500mA 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
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 threshold,
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.
The CMPWR150 is available in either an 8-pin SOIC
thermally enhanced package, ideal for space critical
applications, or a 5-pin TO-263 package.
CMPWR150SA
8-pin SOIC Thermal Package
Typical Application Circuit
CMPWR150
Simplified Electrical Schematic
STANDARD PART ORDERING INFORMATION
Pa c k a g e
Orde ring Part N um be r
Pins
Style
Part Mark ing
Tape & R e e l
Tube s
8
5
SOIC Thermal
TO-263
CMPWR150SA
CMPWR150TO
CMPWR150SA/R
CMPWR150TO/R
CMPWR150SA/T
CMPWR150TO/T
© 1999 California Micro Devices Corp. All rights reserved. SmartOR is a trademark of California Micro Devices Corp.
9/99
C0590899
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
CALIFORNIA MICRO DEVICES
ABSOLUTE MAXIMUM RATINGS
Param e te r
ESD Protection (HBM)
V
C C
Input Voltage
Drive Logic Voltage
Storage Temperature Range
Operating Ambient
Operating Junction
Power Dissipation: TO-263
SOIC
N o te 1
R ating
2000
+6.0, Gnd -0.5
V
C C
+0.5, Gnd -0.5
-40 to +150
0 to +70
0 to +125
1.0
W
Unit
V
V
V
o
C
CMPWR150
OPERATING CONDITIONS
Param e te r
V
CC
Temperature (Ambient)
Load Current
C
EXT
R ange
5.0 ± 0.5
0 to +70
0 to 500
10 ± 10%
Unit
V
o
C
mA
mF
Sym bol
V
O U T
I
O U T
V
C C S E L
V
C C D E S
V
C C H Y S T
I
S /C
I
R C C
V
R LO A D
V
R L I N E
I
C C
ELECTRICAL OPERATING CHARACTERISTICS
(over operating conditions unless specified other wise)
Param e te r
Conditions
MIN
TY P
R e g u l a to r Ou tp u t Vo l ta g e
500mA>I
LO A D
>0mA
3.135
3.30
R e g u l a t o r Ou t p u t C u r r e n t
500
800
S e l e c t Vo l ta g e
Regulator Enabled
4.35
D e se l e c t Vo l ta g e
Regulator Disabled
3.90
4.10
Hysteresis Voltage
Hysteresis
Note 2
0.25
S h o rt Ci rc u i t Ou tp u t Cu rre n t V
C C
= 5V, V
O U T
= 0V
1200
V
C C
Pin Reverse Leakage
Load Regulation
Line Regulation
Quiescent Supply current
V
O U T
= 3.3V, V
C C
= 0V
V
C C
= 5V, I
LO A D
= 50mA to 500mA
V
C C
= 4.5V to 5.5V, I
LO A D
= 5mA
V
C C
> V
C C S E L ,
I
LOAD
= 0mA
V
C C D E S
> V
C C
> V
O U T
V
O U T
> V
C C
Regulator Disabled
V
C C
= 5V, I
LOAD
= 5mA
V
C C
= 5V, I
LO A D
= 500mA
R
P U L L U P
to V
C C
, V
C C
> V
C C S E L
R
P U L L D O W N
to GND, V
C C D E S
> V
C C
C
D R IV E
=1nF, V
C C
t
R IS E
< 100ns
C
D R IV E
=1nF, V
C C
t
FA L L
< 100ns
5
75
2
1.0
0.15
0.01
0.15
1.0
1.2
100
200
1.0
0.2
MAX
UN I T
3.465
4.45
V
mA
V
mA
50
mA
mV
mV
I
G N D
Ground Pin Current
Note 3
3.0
0.25
0.02
0.30
2.5
3.0
400
400
mA
mA
W
ms
R
O H
R
O L
t
D H
t
D L
Note 1:
Drive Pull-up Resistance
Drive Pull-down Resistance
Drive High Delay
Drive Low Delay
Note 2:
Note 3:
The SOIC package used is thermally enhanced through the use of a fused integral leadframe. 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.)
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 0.25
Ω
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.
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.
©1999 California Micro Devices Corp. All rights reserved.
2
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
9/99
CALIFORNIA MICRO DEVICES
Interface Signals
CMPWR150
minimize any disturbances. If the V
CC
pin is within a few
inches of the main input filter, a capacitor may not be
necessary. Otherwise an input filter capacitor in the range
of 1uF to 10uF will ensure adequate filtering.
GND
is the negative reference for all voltages. The current
that flows in the ground connection is very low (typically
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.
n.c.
pins are electrically isolated from the internal circuitry.
These pins can be connected to any external voltage level
without impacting the device funtionality.
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 typically), the internal
regulator (500mA max) will be enabled and deliver a fixed
3.3V at V
OUT
. When V
CC
falls below V
CCDES
(4.10V typically)
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 transitions, 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 resistance 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
Sym bol
V
C C
GND
V
O U T
Drive
n.c.
PIN FUNCTIONS
D e scription
Positive Supply input for regulator. When V
C C
falls below 4.1V, the regulator is disabled.
Negative reference for all voltages.
Regulator voltage output (3.3V) regulator when V
C C
is present. When V
C C
is not present, the
voltage on V
O U T
is used to bias the internal references.
CMOS Logic Output intended to control external PMOS switch for selecting an auxiliary
voltage supply when V
C C
is not present.
Unconnected pins which are electrically isolated from internal circuitry.
© 1999 California Micro Devices Corp. All rights reserved.
9/99
215 Topaz Street, Milpitas, California 95035
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 5.0 volts and an output capacitance of 10µF.
The external PMOS switch was present and resistive load
conditions were used.
The test data shown here was obtained from engineering
samples. The device was modified to allow the regulator
to function below the dropout threshold for the purpose
of obtaining test data. During normal operation,
production parts will shutdown the regulator below a
4.1V supply.
Dropout Characteristics
of the regulator are shown in
Figure 1. At maximum rated load conditions (500mA), a
100mV drop in regulation occurs when the line voltage
collapses below 4.1V. For light load conditions (50mA),
regulation is maintained for line voltages as low as 3.5V.
In normal operation, the regulator is deselected at 4.1V,
which ensures a regulation output droop of less than
100mV is maintained.
CMPWR150
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 75mV. This translates into an effective output
impedance of approximately 0.15Ω.
Figure 2. Load Regulation.
Ground Current
is shown across the entire range of
load conditions in Figure 3. The ground current has
minimal variation 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.
Figure 1. Dropout Characteristics.
Figure 3. Ground Current.
©1999 California Micro Devices Corp. All rights reserved.
4
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
9/99
CALIFORNIA MICRO DEVICES
Typical DC Characteristics
(continued)
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) in 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.
CMPWR150
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 capacitor.
The total current pulse being applied to either V
AUX
or V
CC
is
equal to the sum of the dc load and the corresponding in-
rush current. Transient currents in excess of 1.0 amps 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 (500mA) conditions.
See Application Note AP-211 for more information.
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 230mV. The
built-in hysteresis of 250mV ensures the regulator remains
enabled throughout the transient.
Figure 4. V
CC
Supply Current (No Load).
Typical Transient Characteristics
The transient characterization test set-up 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 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 20 millisecond duration.
This is considered to represent worst case conditions for
most application circuits.
A maximum rated load current of 500mA was used during
characterization, unless specified otherwise.
Prior to V
CC
reaching an acceptable logic supply level (2V),
a disturbance on the Drive pin can be observed.
Figure 5. V
CC
Power-up Cold Start.
CMPWR150
F
Transient Characteristics Test Set-up
© 1999 California Micro Devices Corp. All rights reserved.
9/99
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
5
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