500 mA/3.3 V SmartOR Power Regulator

CMPWR150
500 mA/3.3 V SmartORt Power
Regulator
Product Description
The CMPWR150 is a low dropout regulator that delivers up to
500 mA of load current at a fixed 3.3 V output. An internal threshold
level (typically 4.1 V) 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
VCC 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 3.3 V
supply.
When VCC 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 VCC to be dynamically switched without loss of output voltage.
The CMPWR150 is housed in an 8−pin SOIC thermally enhanced
package which is ideal for space critical applications. The
CMPWR150 is available with RoHS compliant lead−free finishing.
Features
•
•
•
•
•
•
•
•
•
SIOC 8
SF SUFFIX
CASE 751BD
MARKING DIAGRAM
CMPWR150SF
CMPWR150SF = Specific Device Code
Automatic Detection of VCC Input Supply
Drive Output Logic to Control External Switch
Glitch−Free Output During Supply Transitions
500 mA Output Maximum Load Current
Built−In Hysteresis During Supply Selection
Controller Operates from Either VCC or VOUT
8−Pin Power SOIC Thermal Package
These Devices are Pb−Free and are RoHS Compliant
ORDERING INFORMATION
Device
Package
Shipping†
CMPWR150SF
SOIC
(Pb−Free)
2500/Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Applications
•
•
•
•
•
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PCI Adapter Cards
Network Interface Cards (NICs)
Dual Power Systems
Systems with Standby Capabilities
USB Powered Devices Such as Printers, Scanners, MP3 Players and
Zip Drives
See Application Note AP−211
© Semiconductor Components Industries, LLC, 2011
April, 2011 − Rev. 4
1
Publication Order Number:
CMPWR150/D
CMPWR150
TYPICAL APPLICATION CIRCUIT
SIMPLIFIED ELECTRICAL SCHEMATIC
3.3 V
VAUX
VCC
+
FDN338P
(Si2310DS)
−
+
Deselect
5V
−
Drive
-
CMPWR150
VCC +
Controller
VCC
+ CIN
1 mF
4.1 V
Drive
GND
VOUT
GND
+ COUT
VOUT
3.3 V/500 mA
+
VREF
3.3 V
En
RegAmp
VOUT
3.3 V/500 mA
10 mF
PACKAGE / PINOUT DIAGRAM
Top View
N.C.
1
8
GND
VCC
2
7
GND
VOUT
3
6
GND
DRIVE
4
5
GND
8−Pin SOIC
CMPWR150
Table 1. PIN DESCRIPTIONS
Pin(s)
Name
Description
1
N.C.
This is a no−connect pin.
2
VCC
VCC is the power source for the internal regulator and is monitored continuously by an internal controller
circuit. Whenever VCC exceeds VCCSEL (4.35 V typically), the internal regulator (500 mA max) will be enabled
and deliver a fixed 3.3 V at VOUT. When VCC falls below VCCDES (4.10 V typically) the regulator will be
disabled. Internal loading on this pin is typically 1.0 mA when the regulator is enabled, which decreases to
0.15 mA whenever the regulator is disabled. If VCC falls below the voltage on the VOUT pin the VCC loading
will further decrease to only a few microamperes. During a VCC power up sequence, there will be an effective
step increase in VCC 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 VCC pin. The magnitude of the
disturbance will be directly proportional to the effective power supply source impedance being delivered to the
VCC input. To prevent chatter during Select and Deselect transitions, a built−in hysteresis voltage of 250 mV
has been incorporated. It is recommended that the power supply connected to the VCC input have a source
resistance of less than 0.25 W to minimize the event of chatter during the enabling/disabling of the regulator.
An input filter capacitor in close proximity to the VCC pin will reduce the effective source impedance and help
minimize any disturbances. If the VCC 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 1 mF to 10 mF will ensure adequate filtering.
3
VOUT
VOUT 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 VCC falls below VOUT, then VOUT will be used to provide the necessary quiescent current for the
internal reference circuits. This ensures excellent start−up characteristics for the regulator.
4
DRIVE
5−8
GND
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 VOUT to be powered from an auxiliary supply
voltage (3.3 V).
The Drive pin is pulled HIGH to VCC whenever the regulator is enabled. This ensures that the auxiliary
remains isolated during normal regulator operation.
GND is the negative reference for all voltages. The current that flows in the ground connection is very low
(typically 1.0 mA) and has minimal variation over all load conditions.
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CMPWR150
SPECIFICATIONS
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
ESD Protection (HBM)
Pin Voltages
VCC
DRIVE
Rating
Units
±2000
V
[GND − 0.5] to [+6.0]
[GND − 0.5] to [VCC + 0.5]
Storage Temperature Range
−40 to +150
Operating Temperature Range
Ambient
Junction
0 to +70
0 to +125
Power Dissipation
SOIC (Note 1)
1.0
V
°C
°C
W
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
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 factory for
thermal evaluation assistance.)
Table 3. STANDARD OPERATING CONDITIONS
Parameter
VCC Input Voltage
Rating
Units
4.5 to 5.5
V
Ambient Operating Temperature Range
0 to +70
°C
Load Current
0 to 500
mA
CEXT
10 ±10%
mF
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CMPWR150
SPECIFICATIONS (Cont’d)
Table 4. ELECTRICAL OPERATING CHARACTERISTICS (Note 2)
Symbol
Parameter
VOUT
Regulator Output Voltage
IOUT
Regulator Output Current
Conditions
0 mA < ILOAD < 500 mA
Min
Typ
Max
Units
3.135
3.300
3.465
V
500
800
VCCSEL
Select Voltage
Regulator Enabled
VCCDES
Deselect Voltage
Regulator Disabled
4.10
V
VCCHYST
Hysteresis Voltage
Hysteresis (Note 3)
0.25
V
Short−Circuit Output Current
VCC = 5 V, VOUT = 0 V
1200
mA
VCC Pin Reverse Leakage
VOUT = 3.3 V, VCC = 0.0 V
5
VR LOAD
Load Regulation
VCC = 5 V, ILOAD = 50 to 500 mA
75
mV
VR LINE
Line Regulation
VCC = 4.5 to 5.5 V, ILOAD = 5 mA
2
mV
Quiescent Supply Current
VCC > VCCDES, ILOAD = 0 mA
VCCDES > VCC > VOUT
VOUT > VCC
1.0
0.15
0.01
3.0
0.25
0.02
mA
IGND
Ground Pin Current
Regulator Disabled (Note 4)
VCC = 5 V, ILOAD = 5 mA (Note 4)
VCC = 5 V, ILOAD = 500 mA (Note 4)
0.15
1.0
1.2
0.30
2.5
3.0
mA
ROH
DRIVE Pull−up Resistance
RPULLUP to VCC, VCC > VCCSEL
100
400
W
ROL
DRIVE Pull−down Resistance
RPULLDOWN to GND, VCCDES > VCC
200
400
W
TDH
Drive High Delay
CDRIVE = 1 nF, VCC TRISE < 100 ns
1.0
mS
TDL
Drive Low Delay
CDRIVE = 1 nF, VCC TFALL < 100 ns
0.2
mS
ISC
IRCC
ICC
4.35
mA
3.90
4.45
50
V
mA
2. Operating Characteristics are over Standard Operating Conditions unless otherwise specified.
3. The hysteresis defines the maximum level of acceptable disturbance on VCC during switching. It is recommended that the VCC source
impedance be kept below 0.25 W 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.
4. Ground pin current consists of controller current (0.15 mA) and regulator current if enabled. The controller always draws 0.15 mA from either
VCC or VOUT, whichever is greater. All regulator current is supplied exclusively from VCC. At high load currents a small increase occurs due
to current limit protection circuitry.
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CMPWR150
TYPICAL DC CHARACTERISTICS
Ground Current is shown across the entire range of load
conditions in Ground Current. 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.
Unless stated otherwise, all DC characteristics were
measured at room temperature with a nominal VCC supply
voltage of 5.0 V and an output capacitance of 10 mF. 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 4.1 V supply.
Dropout Characteristics of the regulator are shown in
Dropout Characteristics. At maximum rated load conditions
(500 mA), a 100 mV drop in regulation occurs when the line
voltage collapses below 4.1 V. For light load conditions
(50 mA), regulation is maintained for line voltages as low as
3.5 V
In normal operation, the regulator is deselected at 4.1 V,
which ensures a regulation output droop of less than 100 mV
is maintained.
Figure 3. Ground Current
VCC Supply Current of the device is shown across the
entire VCC range for both VAUX present (3.3 V) and absent
(0 V) in V
In the absence of VAUX, the supply current remains fixed
at approximately 0.15 mA until VCC reaches the Select
voltage threshold of 4.35 V. At this point the regulator is
enabled and a supply current of 1.0 mA is conducted.
When VAUX is present, the VCC supply current is less than
10 mA until VCC exceeds VAUX, at which point VCC then
powers the controller (0.15 mA). When VCC reaches
VSELECT, the regulator is enabled.
Figure 1. Dropout Characteristics
Load Regulation performance is shown from zero to
maximum rated load in Load Regulation. A change in load
from 10% to 100% of rated, results in an output voltage
change of less than 75 mV. This translates into an effective
output impedance of approximately 0.15 W.
Figure 4. VCC Supply Current (No Lead)
Figure 2. Load Regulation
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CMPWR150
TYPICAL TRANSIENT CHARACTERISTICS
The transient characterization test set−up shown below
includes the effective source impedance of the VCC supply
(RS). This was measured to be approximately 0.2 W. It is
recommended that this effective source impedance be no
greater than 0.25 W to ensure precise switching is
maintained during VCC selection and deselection.
Both the rise and fall times during VCC 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 500 mA was used
during characterization, unless specified otherwise.
During a selection or deselection transition, the DC load
current is switching from VAUX to VCC 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 VAUX or VCC
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 VCC power−up/down show the
full bandwidth response at the VCC and VOUT pins under
full load (500 mA) conditions.
See Application Note AP−211 for more information.
VCC Power−up Cold Start. Figure 5 shows the output
response during an initial VCC power−up with VAUX not
VAUX
TR = 20 ms
TF = 20 ms
Figure 5. VCC Power−up Cold Start
Si2301DS
3.3 V
RS
VCC
+5 V
present. When VCC 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 VCC pin of about 230 mV. The
built−in hysteresis of 250 mV ensures the regulator remains
enabled throughout the transient.
Prior to VCC reaching an acceptable logic supply level
(2 V), a disturbance on the Drive pin can be observed.
VCC
0.2 W
+ C1
10 mF
Drive
VOUT
C2
0.1 mF
GND
VOUT
C3
+ C4
0.1 mF
GND
Figure 6. Transient Characteristics Test Set−Up
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10 mF
(500 mA)
6.6 W
CMPWR150
VCC Power−up (VAUX = 3.3 V). Figure 7 shows the
output response as VCC approaches the select threshold
during a power−up when VAUX is present (3.3 V). The
output capacitor is already fully charged. When VCC reaches
the select threshold, the in−rush current is minimal and the
VCC disturbance is only 130 mV. The built−in hysteresis of
250 mV ensures the regulator remains enabled throughout
the transient.
during a power−down transition. VAUX of 3.3 V remains
present. When VCC reaches the deselect threshold (4.1 V),
the regulator turns off. This causes a step change reduction
in VCC current resulting in a small voltage increase at the
VCC input. This disturbance is approximately 100 mV and
the built−in hysteresis of 250 mV ensures the regulator
remains disabled throughout the transient. The output
voltage experiences a disturbance of approximately 100 mV
during the transition.
VOUT offset = 3.3 V, VCC offset = 4.3 V
VOUT offset = 3.3 V, VCC offset = 4.3 V
Figure 7. VCC Power−up (VAUX = 3.3 V)
Figure 9. VCC Power−down (VAUX = 3.3 V)
VCC Power−up (VAUX =3.0 V). Figure 8 shows the
output response as VCC approaches the select threshold
during power−up. The auxiliary voltage, VAUX is set to a low
level of 3.0 V. When VCC reaches the select threshold,
a modest level of in−rush current is required to further
charge the output capacitor resulting in VCC disturbance of
200 mV. The built−in hysteresis of 250 mV ensures the
regulator remains enabled throughout the transient.
Load Step Response. Figure 10 shows the output
response of the regulator during a step load change from
5 mA to 500 mA (represented on Ch1). An initial transient
overshoot of 50 mV occurs and the output settles to its final
voltage within a few microseconds. The dc voltage
disturbance on the output is approximately 75 mV, which
demonstrates the regulator output impedance of 0.15 W.
VOUT offset = 3.3 V
VOUT offset = 3.3 V, VCC offset = 4.3 V
Figure 10. Load Step Response
Figure 8. VCC Power−up (VAUX = 3.0 V)
VCC Power−down (VAUX = 3.3V). Figure 9 shows the
output response as VCC approaches the deselect threshold
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CMPWR150
Line Step Response. Figure 11 shows the output response
of the regulator to a VCC line voltage transient between
4.5 V and 5.5 V (1 Vpp as shown on Ch1). The load
condition during this test is 5 mA. The output response
produces less than 10 mV of disturbance on both edges
indicating a line rejection of better than 40 dB at high
frequencies.
VOUT offset = 3.3 V
Figure 11. Line Step Response
TYPICAL THERMAL CHARACTERISTICS
Output Voltage vs. Temperature. Figure 12 shows the
regulator VOUT performance up to the maximum rated
junction temperature. The overall 100°C variation in
junction temperature causes an output voltage change of
about 30 mV, reflecting a voltage temperature coefficient of
90 ppm/°C.
Output Voltage (500 mA) vs. Temperature. Figure 13
shows the regulator steady state performance when fully
loaded (500 mA) in an ambient temperature up to the rated
maximum of 70°C. The output variation at maximum load
is approximately 25 mV across the normal temperature
range.
Thermal dissipation of junction heat consists primarily of
two paths in series. The first path is the junction to the case
(qJC) thermal resistance, which is defined by the package
style, and the second path is the case to ambient (qCA)
thermal resistance, which is dependent on board layout.
For a given package style and board layout, the operating
junction temperature is a function of junction power
dissipation PJUNC and the ambient temperature, resulting in
the following thermal equation:
T JUNC + T AMB ) T JUNC(q JC) ) P JUNC(q CA)
Measurements showing performance up to maximum
junction temperature of 125°C were performed under light
load conditions (5 mA). This allows the ambient
temperature to be representative of the internal junction
temperature.
Figure 13. Output Voltage (500 mA) vs. Temperature
Figure 12. Output Voltage vs. Temperature
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CMPWR150
Thresholds vs. Temperature. Figure 14 shows the
regulator select/deselect threshold variation up to the
maximum rated junction temperature. The overall 100°C
change in junction temperature causes a 30 mV variation in
the select threshold voltage (regulator enable). The deselect
threshold level varies about 50 mV over the 100°C change
in junction temperature. This results in the built−in
hysteresis having minimal variation over the entire
operating junction temperature range.
Figure 14. Threshold vs. Temperature
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CMPWR150
PACKAGE DIMENSIONS
SOIC 8, 150 mils
CASE 751BD−01
ISSUE O
E1
E
SYMBOL
MIN
A
1.35
1.75
A1
0.10
0.25
b
0.33
0.51
c
0.19
0.25
D
4.80
5.00
E
5.80
6.20
E1
3.80
4.00
MAX
1.27 BSC
e
PIN # 1
IDENTIFICATION
NOM
h
0.25
0.50
L
0.40
1.27
θ
0º
8º
TOP VIEW
D
h
A1
θ
A
c
e
b
L
SIDE VIEW
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MS-012.
SmartOR is a trademark of Semiconductor Components Industries, LLC (SCILLC).
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
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Sales Representative
CMPWR150/D
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