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TC1266VOA Datenblatt(PDF) 1 Page - Microchip Technology

Teilenummer TC1266VOA
Bauteilbeschribung  200mA PCI LDO
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Hersteller  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1266VOA Datenblatt(HTML) 1 Page - Microchip Technology

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 2001-2012 Microchip Technology Inc.
DS21377C-page 1
TC1266
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
• 200mA Load Current Capability
• Kelvin Sense Input
• Low Dropout Voltage (240mV @ Full Load)
• Low Ground Current, Independent of Load
Applications
• PCMCIA
•PCI
• Network Interface Cards (NICs)
• CardbusTM Technology
Device Selection Table
Package Type
General Description
The TC1266 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, 200mA (max) output voltage when the main (5V)
or auxiliary (3.3V) input voltage supplies are present.
The TC1266 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 (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 swi-
tchover, Kelvin sensing, and small size make the
TC1266 the optimum LDO for PCI 2.0 applications.
Functional Block Diagram
Part Number
Package
Junction
Temp. Range
TC1266VOA 8-Pin SOIC (Narrow) -5°C to +125°C
TC1266VUA
8-Pin MSOP
-5°C to +125°C
1
2
3
4
8
7
6
5
TC1266
SENSE
VOUT
NC
8-Pin SOIC
NC
VAUX
GND
VIN
DR
1
2
3
4
8
7
6
5
TC1266
8-Pin MSOP
NC
VAUX
GND
VIN
SENSE
VOUT
NC
DR
+
VIN
VAUX
GND
DR
VOUT
SENSE
Bandgap
Reference
Detect
E/A
200mA PCI LDO


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