OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

CMPWR280TN

P1-P3P4-P6P7-P9P10-P12P13-P13
© 2004 California Micro Devices Corp. All rights reserved.
08/16/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 1
CMPWR280
1.5A SmartOR
TM
Dual Regulator with V
AUX
Drive
Features
• Selects from 3 input voltages and provides 3.3V
output
• Automatic selection of V
CC
, V
SBY
or V
AUX
• Drive control signal for external V
AUX
switch
• Glitch-free 3.3V output during supply transitions
• Built-in hysteresis for supply selection
•V
CC
regulates up to 1.5A output current
•V
SBY
regulates up to 375mA output current
• Foldback current limiting
• Thermal shutdown with hysteresis
• TO-263 standard and thin-body packages
• Lead-free versions avilable
Applications
• Peripheral Component Interface (PCI) Adapter
Cards
• Network Interface Cards (NICs)
• Multiple Powered Systems
• Systems with Standby Capabilities
Product Description
The California Micro Devices’ SmartOR
TM
CMPWR280 is a fully protected Dual-Input low-dropout
CMOS regulator that also provides the necessary con-
trol signal for driving an external auxiliary P-channel
MOSFET switch. The SmartOR
TM
device automatically
selects one of three possible inputs on a priority basis:
V
CC
(1.5A), V
SBY
(375mA) or V
AUX
via the drive signal
used to control an external switch.
V
CC
is given first priority. In the event of the V
CC
supply
being powered down, the device will automatically
deselect the V
CC
prior to regulator dropout and imme-
diately select V
SBY
(second priority) as its power
source.
If neither V
CC
nor V
SBY
are present the drive control
output will turn-on an external P-channel MOSFET
switch from an auxiliary 3.3V supply V
AUX
to V
OUT
.
All the necessary control circuitry needed to provide a
smooth and automatic transition between all three sup-
plies has been incorporated. This allows V
CC
to be
dynamically switched without loss of output voltage.
The CMPWR280 is internally protected against output
short-circuits, current overload and thermal overload.
The CMPWR280 is housed in both a standard, 5-lead
TO-263 package or a thin-body, 5-lead TO-263 pack-
age and is available with optional lead-free finishing.
Simplified Electrical Schematic
Typical Application Circuit
V
OUT
GND
V
OUT
CMPWR280
V
CC
10
µ
F
5V
V
CC
C
OUT
+
GND
1
µ
F
+
3.3V
V
SBY
5V
1
µ
F
+
V
SBY
Drive
V
AUX
3.3V
FDN338P
(Si2310DS)
400mA
375mA
1.5A
C
IN1
C
IN2
+
V
SBY
GND
V
OUT
-
ENABLE
-
Controller
S
W
A
UX
3.3V
4.1V
V
DESELECT
Regulator Amp
V
CC/SBY
V
CC
V
REF
CC
SBY
1.5A 375mA
DRIVE
+
+
© 2004 California Micro Devices Corp. All rights reserved.
2 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 08/16/04
CMPWR280
PIN DESCRIPTIONS
PIN(S) NAME DESCRIPTION
1V
SBY
.V
SBY
is the standby 5V supply power source, which is only selected on when V
CC
< V
CCDES
. If VSBY is
selected, the regulator can deliver a maximum of 375mA load current. Whenever V
SBY
exceeds both V
CC
and V
OUT
, it will be used to provide all the internal bias currents and any necessary regulator current.
2V
CC
V
CC
is the primary 5V power supply for the internal regulator. Whenever V
CC
exceeds V
CCSEL
(4.5V), the
internal regulator (up to 1500mA) will be enabled and deliver a fixed 3.3V at V
OUT
. When V
CC
falls below
V
CCDES
(4.1V typically) the regulator will be disabled.
Internal loading on this pin is typically 1.5mA when the regulator is enabled, which reduces to 0.2mA
whenever the regulator is disabled. If V
CC
falls below either the V
SBY
or V
OUT
voltage, the loading on
V
CC
will 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 cur-
rent required for charging/discharging the load capacitance. This line current transient will cause a volt-
age disturbance at the V
CC
pin 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 400mV has
been incorporated. It is recommended that the power supply connected to the V
CC
input should have a
source impedance of less than 0.15Ω to minimize the chatter during the enabling/disabling of the regula-
tor.
3 GND GND is the negative reference for all voltages. The current that flows in the ground connection is very
low (typically 2.0mA) and has minimal variation over all load conditions.
4V
OUT
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 both V
CC
and V
SBY
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.
5 DRIVE Drive is an active LOW logic output intended to be used as the control signal for driving an external P-
channel MOSFET switch 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, thus ensuring that the auxiliary
supply remains isolated during normal regulator operation.
PACKAGE / PINOUT DIAGRAM
Note: These drawings are not to scale.
5-pin TO-263
1
2
3
4
5
Top View
VSBY
V
CC
GND
V
OUT
DRIVE
CMPWR280TO/TN
5-pin Thin TO-263
1
2
3
4
5
Top View
VSBY
V
CC
GND
V
OUT
DRIVE
CMPWR280TA/TB
© 2004 California Micro Devices Corp. All rights reserved.
08/16/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 3
CMPWR280
Ordering Information
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
Specifications
Note 1: The maximum power dissipation of this device is internally limited by thermal shutdown circuitry. To achieve a power dissipa-
tion of 3.0 watts, a case-to-ambient thermal resistance of 25°C/W must be provided. This will typically require dedicated
heatsinking ability of the printed circuit board. For more details, please see the Typical Thermal Characteristics section.
PART NUMBERING INFORMATION
Regulator Pins Package
Standard Finish Lead-free Finish
Ordering Part
Number
1
Part Marking
Ordering Part
Number
1
Part Marking
CMPWR280 5 TO-263 CMPWR280TO CMPWR280TO CMPWR280TN CMPWR280TN
CMPWR280 5 Thin TO-263 CMPWR280TA CMPWR280TA CMPWR280TB CMPWR280TB
ABSOLUTE MAXIMUM RATINGS
PARAMETER RATING UNITS
ESD Protection (HBM) +
2000 V
Pin Voltages
V
CC
, V
SBY
, V
OUT
,
DRIVE
[GND - 0.5] to [+6.0]
[GND - 0.5] to [V
CC
(V
SBY
)+ 0.5]
V
V
Storage Temperature Range -40 to +150 °C
Operating Temperature Range
Ambient
Junction
0 to +70
0 to +150
°C
°C
Power Dissipation (See Note 1)
TO-263
Thin TO-263
Internally Limited
Internally Limited
W
W
STANDARD OPERATING CONDITIONS
PARAMETER RATING UNITS
V
CC,
V
SBY
Input Voltage 4.75 to 5.25 V
Ambient Operating Temperature Range 0 to +70 °C
C
EXT
10 +10% µF
P1-P3P4-P6P7-P9P10-P12P13-P13

CMPWR280TN

Mfr. #:
Buy CMPWR280TN
Manufacturer:
ON Semiconductor
Description:
LDO Voltage Regulators 15A Dual Regulator with Vaux Drive
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet