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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
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.
The TC1267 consists of an LDO, a voltage threshold
detector, external switchover logic and gate drive
circuitry. It functions as a conventional LDO as long as
the voltage on the main supply input (V
IN
) is above the
lower threshold (3.90V typical). Should the voltage on
V
IN
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
V
OUT,
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.
Applications
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PCMCIA
PCI
Network Interface Cards (NICs)
Cardbus
TM
Technology
Desktop Computers
Device Selection Table
Part Number
TC1267VET
Package
5-Pin DDPAK
Junction
Temp. Range
-5掳C to +95掳C
Functional Block Diagram
Pin Configuration
5-Pin DDPAK
Tab is GND
V
IN
V
AUX
Detect
D
R
Bandgap
Reference
TC1267
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E/A
+
GND
V
OUT
1 2 3 4 5
V
AUX
V
IN
GND
V
OUT
D
R
2002 Microchip Technology Inc.
DS21378B-page 1
漏
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