CALMIRCO CMPWR101 250ma smartor regulator with v switch Datasheet

CMPWR101
CALIFORNIA MICRO DEVICES
250mA SmartORTM Regulator with VAUX Switch
Features
Applications
• Automatic detection of V CC input supply
• PCI adapter cards
• Glitch-free output during supply transitions
• Network Interface Cards (NIC’s)
• Built-in hysteresis during supply selection
• Dual power systems
• 250mA output maximum load current
• Systems with standby capabilities
• Fully integrated VAUX switch
• Overload current protection
• Short circuit current protection
• Operates from either VCC or V AUX
• 8-pin SOIC package
Product Description
The California Micro Devices’ SmartORTM CMPWR101 is
a low dropout regulator that delivers up to 250mA 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 VCC falls below the
threshold level. When the regulator is disabled, a low
impedance, fully integrated switch is enabled which
allows the output to be directly powered from an auxiliary 3.3V supply.
When VCC is restored to a level above the select threshold, the low impedance 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.
An output logic signal, DRIVE, is active LOW whenever
the internal regulator is disabled.
PIN DIAGRAM AND APPLICATION CIRCUIT
Top View
CMPWR101
VCC
1
8
DRIVE
VAUX
2
7
VOUT
VAUX
3
6
VOUT
GND
4
5
NC
VCC
+
VCC
5V +
CIN
VAUX
VOUT
GND
1µF
+
VAUX
– 3.3V
–
VOUT
3.3V
250mA
DRIVE
+
COUT
4µF
CMPWR101
8-Pin SOIC
GND
Pin Diagram
Typical Application Circuit
STANDARD PART ORDERING INFORMATION
Package
Pins
8
Style
SOIC
Ordering Part Number
Tubes
Tape & Reel
CMPWR101S/T
CMPWR101S/R
C1660101
© 2001 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.
215 Topaz Street, Milpitas, California 95035 3/6/2001
Tel: (408) 263-3214
Part Marking
CMPWR101S
Fax: (408) 263-7846
www.calmicro.com
1
CMPWR101
CALIFORNIA MICRO DEVICES
ABSOLUTE MAXIMUM RATINGS
Parameter
ESD Protection (HBM)
VCC, VOUT Voltages
Drive Logic Voltage
VAUX Input 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
4.0, GND –0.5
–40 to 150
0 to 70
0 to 125
0.5
Unit
V
V
V
V
˚C
˚C
˚C
W
OPERATING CONDITIONS
Range
Unit
VCC
Parameter
5 ± 0.5
V
VAUX
3.3 ± 0.3
V
0 to 70
˚C
0 to 250
mA
4.7 ± 20%
µF
Temperature (Ambient)
Load Current
CEXT
ELECTRICAL OPERATING CHARACTERISTICS
(over operating conditions unless specified otherwise)
Symbol
VOUT
Parameter
Regulator Output Voltage
ILIM
Regulator Current Limit
Conditions
0mA < ILOAD < 250mA
MIN
3.135
TYP
3.30
MAX
3.465
275
VCCSEL
Select Voltage
Regulator Enabled
VCCDES
Deselect Voltage
Regulator Disabled
VCCHYST
Hysteresis Voltage (Note 2)
Hysteresis
VR LOAD
Load Regulation
VCC = 5V, ILOAD = 5 to 250mA
VR LINE
Line Regulation
VCC = 4.5V to 5.5V, ILOAD = 5mA
RSWITCH
Auxiliary Switch Resistance
VCCDES > VCC, VAUX = 3.3V
IRCC
VCC Pin Reverse Leakage
IRAUX
VAUX Pin Reverse Leakage
IGND
Ground Current
mA
4.30
3.90
UNIT
V
4.45
4.10
V
V
0.20
V
20
mV
2
mV
0.25
0.4
Ω
VAUX = 3.3V, VCC = 0V
2
50
µA
VAUX = 0V, VCC = 5V
2
50
µA
VCC < VCCDES, ILOAD = 0mA
0.2
0.4
mA
VCC > VCCSEL, ILOAD = 0mA
0.6
1.0
mA
VCC > VCCSEL, ILOAD = 250mA
0.7
1.2
mA
VAUX > VCC
0.2
0.4
mA
IAUX
VAUX Supply Current
VCC > VAUX
0.02
0.1
mA
ROH
Drive Pull-up Resistance
RPULLUP to VCC, VCC > VCCSEL
4.0
8.0
kΩ
ROL
Drive Pull-down Resistance
RPULLDOWN to GND, VCCDES > VCC
0.1
0.4
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 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).
Note 2: The hysteresis defines the maximum level of acceptable disturbance on VCC during switching. It is recommended that the VCC
source impedance be kept below 0.25Ω 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.
©2001 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
3/6/2001
CMPWR101
CALIFORNIA MICRO DEVICES
Interface Signals
VCC is the power source for the internal regulator and is
monitored continuously by an internal controller circuit.
Whenever VCC exceeds VCCSEL (4.25V typically), the
internal regulator will be enabled and deliver a fixed
3.3V at VOUT. When VCC falls below VCCDES (4.10V typically), the regulator will be disabled.
Internal loading on this pin is typically 0.6mA when the
regulator is enabled, which reduces to 0.1mA whenever
the regulator is disabled. If VCC falls below the voltage on
the VAUX pin, the VCC loading will further reduce to only a
few microamperes.
During a VCC power-up or power-down sequence, there
will be an effective step increase in VCC line current
when the regulator is enabled/disabled. 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.
A built-in hysteresis voltage of 150mV has been
incorporated to minimize any chatter during supply
changeover. It is recommended that the power supply
connected to the VCC input should have a source
resistance of less than 0.25Ω to minimize the event of
chatter during the enabling/disabling of the regulator.
VAUX is the auxiliary power source. When selected,
(VCC < VCCDES), the auxiliary supply is directly connected
to VOUT, via the low impedance (0.3Ω typically) fully
integrated switch.
The internal loading on this pin is typically less than
10µA and will increase to 100µA if VCC falls below the
voltage on VAUX.
When VAUX = 0V, the VCCDES voltage is inhibited which
prevents the regulator from being disabled.
VOUT 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.
DRIVE is a CMOS output logic signal (Active Low)
referenced to the VCC supply. This output is taken low
whenever the internal regulator is not enabled. This
output is intended only as a control signal for external
circuitry.
GND is the negative reference for all voltages. The
current that flows in the ground connection is very low
(typically 0.6mA) and has minimal variation over all load
conditions.
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 1µF to 10µF will help
to lower the effective source impedance.
NC is an unconnected pin which is electrically isolated
from the internal circuitry.
PIN FUNCTIONS
Pin
Symbol
Description
1
VCC
Positive (5V) supply input for regulator. (VCC > VCCSEL)
2, 3
VAUX
Auxiliary supply input is connected directly to the output via a low impedance
6, 7
VOUT
Continuous output voltage (3.3V) is derived from either the internal regulator or low impedance
switch connected to the auxiliary supply input.
8
DRIVE
4
GND
5
NC
when the regulator is disabled.
Output Control Signal which is taken LOW whenever VCC is unavailable
Negative reference for all voltages
Unconnected pin which is electrically isolated from internal circuitry.
VCC
DRIVE
+
–
VDESELECT
4.1V
+
0.2Ω
VAUX
3.3V
VREF
3.3V
ENABLE
VOUT
3.3V
250mA
–
GND
Simplified Electrical Schematic
© 2001 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.
215 Topaz Street, Milpitas, California 95035 3/6/2001
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
3
CMPWR101
CALIFORNIA MICRO DEVICES
0.8
0.34
0.7
0.32
0.6
Resistance (Ω)
VCC Supply Current (µA)
Typical DC Characteristics (nominal conditions unless specified otherwise)
0.5
0.4
0.3
0.30
0.28
0.26
0.24
0.2
0.22
0.1
0.20
2.7
0.0
0
1
2
3
4
5
6
3.0
3.6
Auxiliary Supply Voltage (V)
VCC Supply Voltage (V)
Figure 1. Supply Current vs Voltage (VAUX = 3.3V)
Figure 2. Switch Resistance vs Supply Voltage
3.40
0.8
0.7
3.35
Regulator Output (V)
Ground Current (mA)
3.3
0.6
0.5
0.4
0.3
0.2
5mA Load
3.30
250mA Load
3.25
3.20
3.15
0.1
3.10
3.0
0.0
0
100
200
300
3.5
4.0
4.5
5.0
5.5
Supply Voltage (V)
Load Current (mA)
Figure 3. Ground Current vs Output Load
Figure 4. Line Regulation (1% and 100% rated load)
1.2
3.33
3.32
1.0
0.8
3.30
VOUT (V)
VOUT (V)
3.31
3.29
3.28
0.6
0.4
3.27
0.2
3.26
3.25
0.0
0
100
200
300
400
0
Load Current (mA)
Figure 5. Load Regulation
100
200
300
400
Load Current (mA)
Figure 6. Dropout Voltage with Load Current
©2001 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
3/6/2001
CMPWR101
CALIFORNIA MICRO DEVICES
Typical Transient Characteristics (Supply source resistance set to 0.2Ω)
Tek Run: 25kS/s
Tek Run: 25kS/s
Sample
Sample
(200mA Load)
(VAUX = 0V)
Drive
Drive
3
3
VCC
VCC
VOUT
VOUT
(200mA Load)
(VAUX = 0V)
1V
5V
Ch3
Ch2
1V
M 2ms Ch1
500mV
Figure 7. VCC Cold start Power Up (VAUX = 0V)
2.5MS/s
Tek
1 Acqs
Ch3
1V
5V
Ch2
M 2ms
1V
Ch1
4.66V
Figure 8. VCC Complete Power Down (VAUX = 0V)
2.5MS/s
Tek
Drive
1 Acqs
Drive
3
3
VCC (offset = 4.3V)
2
VCC (offset = 4.3V)
2
VOUT (offset = 3.3V)
Ch3
100mV
5V
VOUT (offset = 3.3V)
Ch2 100mV M 20µs Ch1
2.5V
Ch3
Figure 9. VCC Power up (VAUX = 3.3V)
Tek
5MS/s
100mV
5V
Ch2 100mV M 20µs Ch3
2.5V
Figure 10. VCC Power Down (VAUX = 3.3V)
3 Acqs
1MS/s
Tek
1 Acqs
VCC (offset = 5.0V)
25mA to 225mA
Load Step
1V Step(4.5V to 5.5V)
2
2
VCC (offset = 3.3V)
VOUT (offset = 3.3V)
(5mA Load)
20mV
Ch2
2V
M 20µs Ch2
2.08V
Figure 11. Load Transient (10% to 90%) Step Response
20mV
Ch2 500mV M 100µs Ch2
5.01V
Figure 12. Line Transient (1Vpp) Step Response
© 2001 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.
215 Topaz Street, Milpitas, California 95035 3/6/2001
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
5
CMPWR101
CALIFORNIA MICRO DEVICES
3.300
The overall junction to ambient thermal resistance (θJA)
for device power dissipation (PD) consists primarily of
two paths in series. The first path is the junction to the
case (θJC) which is defined by the package style, and the
second path is case to ambient (θCA) thermal resistance
which is dependent on board layout. The final operating
junction temperature for any set of conditions can be
estimated by the following thermal equation:
3.298
Full Load Output Voltage (V)
Typical Thermal Characteristics
3.296
3.294
3.292
3.290
3.288
3.286
TJUNC = TAMB + PD (θJC ) + PD (θCA )
3.284
20
= TAMB + PD (θJA)
30
40
50
60
70
Ambient Temperature (˚C)
Based on maximum power dissipation of 0.43W
(1.7V x 250mA) with an ambient of 70°C the resulting
junction temperature will be:
TJUNC = TAMB + PD (θJA )
= 70°C + 0.43W (80°C/W)
Figure 13. Regulator VOUT vs TAMB (250mA Load)
4.18
Deselect Voltage Level (V)
The CMPWR101 uses a standard SOIC package. When
this package is mounted on a double sided printed
circuit board with two square inches of copper allocated
for “heat spreading”, the resulting overall θJA is 85°C/W.
4.16
4.14
4.12
4.10
= 70°C + 37°C
4.08
25
= 103°C
50
75
100
125
Junction Temperature (˚C)
Thermal characteristics were measured using a double
sided board with two square inches of copper area
connected to the GND pins for “heat spreading”.
Note: The use of multi-layer board construction with
power planes will further enhance the thermal performance of the package. In the event of no copper area
being dedicated for heat spreading, a multi-layer board
construction, using only the minimum size pad layout,
will typically provide the CMPWR101 with an overall θJA
of 100°C/W, which allows up to 0.5W to be safely
dissipated.
0.36
0.34
0.32
Resistance (Ω)
Measurements showing performance up to junction
temperature of 125°C were performed under light load
conditions (5mA). This allows the ambient temperature
to be representative of the internal junction temperature.
Figure 14. Deselect Threshold vs TJUNCT
0.30
0.28
0.26
0.24
0,22
0.20
20
30
40
50
60
70
Ambient Temperature (˚C)
Figure 15. Switch Resistance vs Ambient Temperature
©2001 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.
6
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
3/6/2001