CMPWR280 Ver la hoja de datos (PDF) - California Micro Devices Corp
Número de pieza
componentes Descripción
Fabricante
CMPWR280 Datasheet PDF : 13 Pages
| |||
CMPWR280
1.5A SmartORTM Dual Regulator with VAUX Drive
Features
• Selects from 3 input voltages and provides 3.3V
output
• Automatic selection of VCC, VSBY or VAUX
• Drive control signal for external VAUX switch
• Glitch-free 3.3V output during supply transitions
• Built-in hysteresis for supply selection
• VCC regulates up to 1.5A output current
• VSBY 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’ SmartORTM
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 SmartORTM device automatically
selects one of three possible inputs on a priority basis:
VCC (1.5A), VSBY (375mA) or VAUX via the drive signal
used to control an external switch.
VCC is given first priority. In the event of the VCC supply
being powered down, the device will automatically
deselect the VCC prior to regulator dropout and imme-
diately select VSBY (second priority) as its power
source.
If neither VCC nor VSBY are present the drive control
output will turn-on an external P-channel MOSFET
switch from an auxiliary 3.3V supply VAUX to VOUT.
All the necessary control circuitry needed to provide a
smooth and automatic transition between all three sup-
plies has been incorporated. This allows VCC 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.
Typical Application Circuit
VAUX
3.3V
FDN338P
(Si2310DS)
VSBY
VCC
5V
375mA
CMPWR280
+ 1µF
CIN2
5V
1.5A
+ 1µF
VSBY Drive
VCC
VOUT
GND
CIN1
+ COUT
10µF
Simplified Electrical Schematic
VOUT
3.3V
400mA
VSBY
VCC
Controller
+
+
-
VDESELECT
4.1V
SWAUX
VCC/SBY
ENABLE
1.5A
CC
+
VREF
3.3V
SBY
-
Regulator Amp
GND
GND
375mA
VOUT
DRIVE
© 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
Share Link: 