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參數資料
| 型號： | TC1267VET |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 400mA PCI LDO |
| 中文描述： | 400mA的LDO穩壓器的PCI |
| 文件頁數： | 1/14頁 |
| 文件大小： | 490K |
| 代理商： | TC1267VET |
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)
Cardbus
TM
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.
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.
Functional Block Diagram
Part Number
Package
Junction
Temp. Range
TC1267VET
5-Pin DDPAK
-5°C to +95°C
G
Tab is GND
V
A
V
I
V
O
D
R
1 2 3 4 5
TC1267
5-Pin DDPAK
+
–
V
IN
V
AUX
GND
D
R
V
OUT
Bandgap
Reference
Detect
E/A
400mA PCI LDO
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|---|---|
| TC1268 | 500mA Fixed Output, Fast Response CMOS LDO with Shutdown |
| TC1268-2.5VOA | 500mA Fixed Output, Fast Response CMOS LDO with Shutdown |
| TC1269 | 300mA CMOS LDO with Shutdown and VREF Bypass |
| TC1269-25VUA | 300mA CMOS LDO with Shutdown and VREF Bypass |
| TC1269-30VUA | 300mA CMOS LDO with Shutdown and VREF Bypass |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TC1267VETTR | 功能描述:低壓差穩壓器 - LDO 400mA PCI LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1268 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500mA Fixed Output, Fast Response CMOS LDO with Shutdown |
| TC1268-2.5VOA | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500mA Fixed Output, Fast Response CMOS LDO with Shutdown |
| TC1268-2.5VOATR | 功能描述:低壓差穩壓器 - LDO 500mA Fixed Output RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1269 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:300mA CMOS LDO with Shutdown and VREF Bypass |
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