www.docs.chipfind.ru
2000 Calirornia Micro Devices Corp. All rights reserved.
12/5/2000
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
CALIFORNIA MICRO DEVICES
CMPWR300
1
500mA SmartOR
TM
DUAL REGULATOR WITH V
AUX
SWITCH
Features
8-pin Power SOIC package
Continuous 3.3V output from three inputs
Complete Power Management solution
V
CC
, V
SBY
Regulator supplies 500mA output
Built-in hysteresis when selecting input supplies
Integrated switch has very low R
DS(ON)
0.12 (typ.)
Large Bypass Capacitors on inputs not required
Applications
PCI adapter cards with Wake-On-LAN
Network Interface Cards (NICs)
Multiple Power Systems
Systems with Standby Capabilities
Product Description
The CMPWR300 is a dual input regulator with V
AUX
switch ca-
pable of delivering 3.3V/500mA continuously. The output power
is provided from three independent input voltage sources on a
prioritized basis. Power is always taken in priority using the fol-
lowing order V
CC
, V
SBY
, and V
AUX
.
When V
CC
(5V) or V
SBY
is present, the device automatically en-
ables the regulator and produces a stable 3.3V output at V
OUT
.
When only V
AUX
(3.3V) is present, the device provides a low
impedance direct connection (0.12 typ.) from V
AUX
to V
OUT
.
All the necessary control circuitry needed to provide a smooth
and automatic transition between all three supplies has been
incorporated. This allows both V
CC
and V
SBY
to be dynamically
switched without loss of output voltage.
C0621199
CMPWR300 is a trademark of California Micro Devices Corp.
Pin Diagram
Typical Application Circuit
Simplified Electrical Schematic
T
S
R
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N
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C
When placing an order please specify desired shipping: Tubes or Tape & Reel.
CALIFORNIA MICRO DEVICES
2000 California Micro Devices Corp. All rights reserved.
12/5/2000
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
CMPWR300
2
S
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5
.
3
Note 1: The thermal resistance from junction to ambient (
JA
) must be less than 55 C/W. This is typically achieved with 2 square inches of
copper printed circuit board area connected to the GND pins for heat spreading, or equivalent.
Note 2: The hysteresis defines the maximum level of acceptable disturbance on
V
CC
during switching.
Note 3: Ground current consists of controller current and regulator current if enabled.
2000 Calirornia Micro Devices Corp. All rights reserved.
12/5/2000
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
CALIFORNIA MICRO DEVICES
CMPWR300
3
Interface Signals
V
CC
is the primary power source which is given priority when
present. If this connection is made within a few inches of
the main input filter, a bypass capacitor may not be necessary.
Otherwise a bypass filter capacitor in the range of 1F to
10F will ensure adequate filtering.
The voltage level on V
CC
is compared to an internal threshold
voltage to determine which power source is to be selected.
In order to prevent regulator dropout from occurring, the
threshold has been programmed to ensure V
CC
is deselected
prior to dropout, which prevents loss of output regulation
when switching between V
CC
and V
SBY
. Typically the threshold
is set to 4.2V. Once V
CC
falls below this level, the output
voltage is immediately derived from the auxiliary power
source. To prevent chatter during this transition, the threshold
has a built-in hysteresis of 300mV which results in only V
CC
being selected once the voltage level exceeds 4.50V
(typically).
V
SBY
is the standby 5V supply power source, which is given
priority when V
CC
is not present. The internal regulator will
remain enabled until such time that V
SBY
falls below the
disable threshold level (4.2V typically). If the V
SBY
connection
is made within a few inches of the main input filter, a bypass
capacitor may not be necessary. Otherwise a bypass filter
capacitor in the range of 1F to 10F will ensure adequate
filtering.
V
AUX
is the auxiliary low voltage power source. This supply
is only used when neither the V
CC
nor V
SBY
is available. Under
these conditions an internal switch is enabled and provides
a very low impedance connection directly between V
OUT
and V
AUX
.
V
OUT
is the output voltage. Power is provided from the
regulator or via the low impedance auxiliary switch. This
output requires a capacitance of 10F to ensure regulator
stability and minimize the peak output disturbance during
power supply changeover.
GND provides the reference for all voltages.
S
L
A
N
G
I
S
E
C
A
F
R
E
T
N
I
n
i
P
l
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h
w
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r
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V
5
(
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g
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o
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y
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.
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2
.
4
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5
(
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V
3
.
3
(
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3
.
3
(
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g
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R
CALIFORNIA MICRO DEVICES
2000 California Micro Devices Corp. All rights reserved.
12/5/2000
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
CMPWR300
4
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 10F.
Fig 1.1.
Line regulation of the regulator is shown here. At maximum
rated load conditions (500mA), a 100mV drop in regulation
occurs when the line voltage falls below 3.8V. For light load
conditions (100mA), regulation is maintained for line voltages
as low as 3.5V.
In normal operation the regulator is deselected at 4.2V, which
ensures a regulation output drop of less than 100mV is
maintained.
Fig 1.2.
Load regulation (pulse condition) performance is shown up
to and beyond the rated load. A change in load from 10%
to 100% of rated (50mA to 500mA) results in an output
voltage change of about 20mV. This translates into an
effective output impedance of less than 50m.
Fig 1.3.
V
AUX
Switch Resistance is shown across a broad range of
V
AUX
supply level. From 2.7V and 3.6V, it only varies from
about 130m down to 110m.
Fig 1.2. Load Regulation (pulse condition)
3.24
3.26
3.28
3.30
3.32
3.34
3.36
0
200
400
600
800
Load Current [mA]
Vou
t
[
V
]
Fig 1.1. Line Regulation
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.0
3.5
4.0
4.5
5.0
Vcc [V]
Vo
ut
[
V
]
100mA load
500mA load
Fig 1.3. Vaux Switch Resistance vs. Vaux
60
80
100
120
140
160
180
200
2.7
3
3.3
3.6
Vaux [V]
Re
s
i
s
t
a
n
c
e
[m
O
h
m
]
2000 Calirornia Micro Devices Corp. All rights reserved.
12/5/2000
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
CALIFORNIA MICRO DEVICES
CMPWR300
5
Fig 1.4.
Ground Current is shown across the entire range of load
conditions. The ground current has minimal variation
across the range of load conditions and shows only a
slight increase at maximum load due to the current limit
protection circuitry.
Fig 1.5.
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 the absence of V
AUX
, the supply current remains fixed
at approximately 1mA when V
CC
reaches the voltage level
of about 2.5V. 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
10uA 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.
Fig 1.4. Ground Current
0.0
0.5
1.0
1.5
2.0
0
100
200
300
400
500
Load Current [mA]
I
GN
D
[mA]
Fig 1.5. Vcc Supply Current (No Load)
10
100
1000
10000
1
2
3
4
5
Vcc [V]
I
CC
[A]
Vaux = 0V
Vaux = 3.3V
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