CALIFORNIA MICRO DEVICES
CMPWR160
USB Peripheral Power Management
Features
• 3.3V regulated output up to 500mA
• Quiescent current 35µA (typical)
• Shutdown mode current 7µA (typical)
• 30ms active LOW Power-On Reset (POR) pulse
• Thermal overload protection
• Foldback current limiting protection
• Reverse-current protection
• 8 pin SOIC power package
Applications
• Bus-powered USB peripherals
• Self-powered USB peripherals
• Portable/battery-powered devices
• Critical power monitoring, hot-insertion devices
The SmartOR
TM
CMPWR160 combines a Low Dropout
Regulator (LDO) with a Power-On Reset (POR) pulse
generator, and is intended for Universal Serial Bus
(USB) peripherals. To meet the specification require-
ments of both USB 1.0 and USB 2.0, the CMPWR160
draws a very low quiescent current (35µA), and delivers
up to 500mA of load current at a fixed 3.3V output.
The POR pulse (active LOW) has a typical duration of
30ms after the output has exceeded and stabilized
above 2.9V. Thus a new POR pulse is developed each
time the regulator power is interrupted and restored,
which occurs often on USB buses when cables are
connected (or disconnected) by the user. It is not
necessary to have a V
CC
supply for POR to operate,
allowing the CMPWR160 to work in Wired-ORed power
systems.
When V
CC
is powered down, the device will automatically
enter reverse-current protection mode and maintain
isolation between V
OUT
and V
CC
. This is useful for applica-
tions that can use power from the USB port in addition to
internal batteries or an AC adapter supply (Wired-ORed
power systems). In the event of V
CC
collapsing below
V
OUT
, the device will automatically enter shutdown mode
and fully isolate the V
CC
power source from the output.
A ShutDown input (SD ) forces the regulator to be
powered down on demand. While in shutdown mode the
POR circuitry will remain active, making the device
suitable for systems which contain backup or alternative
power sources.
The CMPWR160 is available in an 8-pin SOIC thermally
enhanced package, ideal for applications where space
is tight.
Block Diagram
Top View
V
CC
SD
POR
V
OUT
1
2
3
4
8
7
6
5
GND
GND
GND
GND
GND
V
REF
3.3V
V
CC
SD
+
–
SD
V
OUT
3.3V/500mA
+
30ms
CMPWR160
8 LEAD SOIC
POR
–
Pin Diagram
2.9V
Simplified Electrical Schematic
Standard Part Ordering Information
Package
Pin
8
Style
Power SOIC
Tubes
CMPWR160SA/T
Ordering Part Number
Tape & Reel
CMPWR160SA/R
Part Marking
CMPWR160SA
C1571000
©2000 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.
215 Topaz Street, Milpitas, California 95035
12/5/2000
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
Voltage
SD Logic Input Voltage
POR Logic Output 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
V
OUT
+ 0.5, GND –0.5
–40 to 150
0 to 70
0 to 125
Internally Limited
Unit
V
V
V
V
CMPWR160
˚
C
Operating Conditions
Parameter
V
CC
Temperature (Ambient)
Load Current
C
EXT
Range
4.2 to 5.5
0 to 70
0 to 500
10 ± 10%
Unit
V
˚
C
mA
µF
Electrical Operating Characteristics
(over operating conditions unless specified otherwise)
Symbol
V
OUT
I
LIM
I
S/C
V
R LOAD
V
R LINE
V
DO
I
Q
I
SD
I
RCC
V
IH SD
V
IL SD
V
POR
T
POR
R
POR
T
DISABLE
T
HYST
Parameter
Regulator Output Voltage
Regulator Current Limit
Short-Circuit Current Limit
Load Regulation
Line Regulation
Regulator Dropout Voltage
Quiescent Supply Current
Shutdown Supply Current
V
CC
Pin Reverse Leakage
Shutdown High Detect
Shutdown Low Detect
POR Detect Threshold
POR Pulse Duration
POR Output Impedance
Shutdown Temperature
Thermal Hysteresis
After POR Threshold Detected
Sinking to GND/Sourcing from V
CC
V
CC
= 5V, I
LOAD
= 5mA to 500mA
V
CC
= 4.2V to 5.5V, I
LOAD
= 5mA
MIN V
CC
– V
OUT
for I
LOAD
= 500mA
Regulator Enabled (No Load)
Regulator Disabled
V
OUT
= 3.3V, V
CC
= 0V
V
CC
= 5V
V
CC
= 5V
4.2V < V
CC
< 5.5V
2.8
20
0.2
Conditions
0mA < I
LOAD
< 500mA
MIN
3.135
550
300
75
2
0.6
35
7
1
3.0
1.0
2.9
30
0.5
160
20
3.0
40
2
0.9
50
10
10
TYP
3.30
MAX
3.465
UNIT
V
mA
mA
mV
mV
V
µA
µA
µA
V
V
V
ms
kΩ
˚
C
˚
C
Note 1:
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.)
©2000 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.
2
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
12/5/2000
CALIFORNIA MICRO DEVICES
Interface Signals
V
CC
is the input power source for the Low Drop Out
Regulator, capable of delivering 3.3V/500mA output
current even when the input is as low as 4.2V.
Internal loading on this pin is typically 35µA when the
regulator is enabled, which reduces to only 7µA when-
ever the regulator is shutdown (SD taken Low). In the
event of V
CC
collapsing below V
OUT
, the loading at V
CC
will
immediately reduce to less than 0.1µA.
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 1µF to 10µF will
ensure adequate filtering.
SD
is the regulator shutdown input logic signal which is
Active Low. This is a true CMOS input signal referenced
to V
CC
supply. When the pin is tied High (V
CC
) the
regulator operates fully. When the pin is taken to GND,
the device enters shutdown mode and the regulator is
fully disabled. In this mode all critical
POR
circuitry
remains fully powered consuming less than 7µA (typical).
CMPWR160
ately enters reverse protection mode to prevent any
current flow back into the regulator pass transistor.
Under these conditions V
OUT
will also be used to provide
the necessary quiescent current for the internal refer-
ence and
POR
circuits. This ensures excellent start-up
characteristics for the regulator.
POR
is the Power-On-Reset output pin (Active Low).
When V
OUT
rises above the
POR
threshold voltage
(typically 2.9V), the pin is forced to logic low (GND). The
pin remains logic low for 30ms then it is forced logic high
(3.3V). If V
OUT
falls below the
POR
threshold voltage
during this 30ms interval
POR
will remain logic low. If it
falls below the voltage threshold and then recovers the
30ms time will reset.
If V
OUT
falls below the
POR
threshold voltage
POR
is
immediately forced to logic low.
The power-on reset circuitry is designed to remain active
under all conditions and will produce a valid output even
when V
CC
is not present. A very low quiescent current
(7µA typical) ensures continuous operation of the POR
circuit.
GND
is the negative reference for all voltages. This
current that flows in the ground connection is very low
(35µA typical with the regulator enabled and 7µA typical
with the regulator disabled).
V
OUT
is the regulator output voltage used to power the
load. An output capacitor of 10µF is used to provide the
necessary phase compensation, thereby preventing
oscillation. The capacitor also helps to minimize the peak
output disturbance during line or load transients. When-
ever V
CC
collapses below the output the device immedi-
Pin Functions
Symbol
V
CC
SD
POR
V
OUT
GND
Description
Positive supply input for regulator. When V
CC
falls below V
OUT
the regulator is disabled.
Shutdown control input signal (Active Low) to disable internal voltage regulator and current supply
to less than 7µA.
Power-On-Reset output signal is held Low until the output has been stable (>2.9V) for at least 30ms.
Regulator voltage ouput (3.3V) capable of delivering 500mA when device is enabled (SD is High).
Whenever the output exceeds 2.9V (TYP) the POR pulse is triggered.
Negative reference for all voltages
CMPWR160
V
CC
+
POR
V
OUT
GND
uP Reset
V
OUT
3.3V/500mA
+
V
CC
5V +
–
C
IN
1µF
SD
C
OUT
10µF
GND
Typical Application Circuit
©2000 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.
215 Topaz Street, Milpitas, California 95035
12/5/2000
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 5V and an output capacitance of 10µF.
Resistive load conditions were used.
Line Regulation 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 has collapses below 3.8V. For light load
conditions (5mA), regulation is maintained for line
voltages as low as 3.3V.
3.35
3.30
3.25
VOUT (V)
CMPWR160
5mA Load
500mA Load
3.20
3.15
3.10
3.05
3.0
3.5
4.0
VCC (V)
4.5
5.0
Figure 1. Line Regulation
VOUT (V)
Load Regulation
performance is shown from zero to
maximum rated load in Figure 2. A 10% to 100% change
of rated load, results in an output voltage change of less
than 10mV. This translates into an effective output
impedance of approximately 0.02Ω.
3.40
3.35
3.30
3.25
3.20
0
200
400
600
Load Current (mA)
Figure 2. Load Regulation
Ground Current (µA)
Ground Current
is shown across the entire range of
load conditions in Figure 3. The ground current increases
by 40µA across the range of load conditions. This
increase is due to the current limiting protective circuitry
becoming active.
100
80
60
40
20
0
0
200
400
600
Load Current (mA)
Figure 3. Ground Current
©2000 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.
4
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
12/5/2000
CALIFORNIA MICRO DEVICES
Typical DC Characteristics
continued
V
CC
Operating Current (no load,
SD
high)
is shown
across a range of V
CC
supply voltages with the regulator
enabled in Figure 4. The graph shows that the operating
current is 35µA typical and changes by less than 1µA
across this range.
60
50
Supply Current (µA)
40
30
20
10
0
3.5
CMPWR160
4.5
V
CC
(V)
5.5
Figure 4. V
CC
Operating Current (no load)
V
CC
Shutdown Current
variation with the V
CC
supply
voltage is shown in Figure 5.
Supply Current (µA)
10
8
6
4
2
0
1.5
2.5
3.5
V
CC
(V)
4.5
5.5
Figure 5. V
CC
Shutdown Current
©2000 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.
215 Topaz Street, Milpitas, California 95035
12/5/2000
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
5
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