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TC1267 Scheda tecnica(PDF) 1 Page - Microchip Technology

Il numero della parte TC1267
Spiegazioni elettronici  400mA PCI LDO
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Produttore elettronici  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21378B-page 1
TC1267
Features
• Glitch Free Transition Between Input Sources
• Automatic Input Source Selection
• External PMOS Bypass Switch Control
• Built-in 5V Detector
• 1% Regulated Output Voltage Accuracy
• 400mA Load Current Capability
• Kelvin Sense Input
• Low Ground Current, Independent of Load
Applications
• PCMCIA
•PCI
• Network Interface Cards (NICs)
• CardbusTM Technology
• Desktop Computers
Device Selection Table
Pin Configuration
General Description
The TC1267 is an application-specific, low dropout
regulator (LDO), specifically intended for use in PCI
peripheral card applications complying with PCI Power
Management (PCI 2.0). It provides an uninterrupted,
3.3V output voltage when the main (5V) or auxiliary
(3.3V) input voltage supplies are present.
TheTC1267consistsof anLDO, a voltagethreshold
detector, external switchover logic and gate drive
circuitry. It functions as a conventional LDO as long as
the voltage on the main supply input (VIN) is above the
lower threshold (3.90V typical). Should the voltage on
VIN fall below the lower threshold, the LDO is disabled
and an external P-channel MOSFET is automatically
turned on, connecting the auxiliary supply input to
VOUT, and ensuring an uninterrupted 3.3V output. The
main supply is automatically selected, if both the main
and auxiliary input supplies are present, and transition
from one input supply to the other is ensured glitch-
free. High integration, automatic secondary supply
switchover, Kelvin sensing, and small size make the
TC1267 the optimum LDO for PCI 2.0 applications.
Functional Block Diagram
Part Number
Package
Junction
Temp. Range
TC1267VET
5-Pin DDPAK
-5°C to +95°C
Tab is GND
1 2 3 4 5
TC1267
5-Pin DDPAK
+
VIN
VAUX
GND
DR
VOUT
Bandgap
Reference
Detect
E/A
400mA PCI LDO


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