http://www.www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf




  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1267 Datasheet

400mA PCI LDO

No Preview Available !

TC1267 pdf
TC1267
400mA PCI LDO
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
Part Number
TC1267VET
Package
5-Pin DDPAK
Junction
Temp. Range
-5°C to +95°C
Pin Configuration
5-Pin DDPAK
Tab is GND
TC1267
1 234 5
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 (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
VIN
VAUX
Detect
GND
Bandgap
Reference
E/A
+
DR
VOUT
© 2002 Microchip Technology Inc.
DS21378B-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1267 Datasheet

400mA PCI LDO

No Preview Available !

TC1267 pdf
TC1267
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Supply Voltage (VIN).............. -0.5V to +7V (Max)
Auxiliary Supply Voltage (VAUX) ..... -0.5V to +7V (Max)
LDO Output Current (IOUT)................................ 400mA
Thermal Impedance,
Junction-to-Ambient (θJA).......... 27°C/W for DDPAK
ESD Rating .......................................................... 2 KV
Operating Temperature Range (TA)........ -5°C to +70°C
Storage Temperature Range (TSTG) ...-65°C to +150°C
*Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. These
are stress ratings only and functional operation of the device
at these or any other conditions above those indicated in the
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
TC1267 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: TA = +25°C, VIN = 5V, VAUX = 3.3V, IOUT = 0.1mA, COUT = 4.7µF, unless otherwise noted. Boldface
type specifications apply over full operating range.
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
VIN
IGND
IVIN
VAUX
IQ(AUX)
Supply Voltage
Ground Current
Reverse Leakage from
VAUX
Supply Voltage
Quiescent Current
4.4 5.0 5.5 V VAUX = 0V
— 230 450 µA VAUX = 0V (Note 6)
— 260 500
VAUX = 3.3V (Note 6)
— -0.1 -1.0 µA VAUX = 3.5V, VIN = 0V, IOUT = 0mA
3.0 3.3 3.6 V
— 50 70 µA VIN = 0V, IOUT = 0mA
— — 100
— 60 80 µA VIN = 5V, IOUT = 0mA
— — 120
IVAUX
VTH(LO)
Reverse Leakage from VIN
5V Detector
Low Threshold Voltage
3.75
-0.1
3.90
-1.0
4.05
µA VIN = 5.5V, VAUX = 0V, IOUT = 0mA
V VIN Falling (Notes 2, 3)
VHYST
5V Detector
Hysteresis Voltage
— 260 — mV (Notes 2, 3)
200 300
VTH(HI)
5V Detector
High Threshold Voltage
— 4.15 —
V VIN Rising (Notes 2, 3)
4.0 4.30
VOUT
LDO Output Voltage
IOUT
REG(LINE)
Output Current
Line Regulation
3.201
3.000
400
-0.5
3.300
0.05
3.366
+0.5
V IOUT = 20mA
V 4.4V VIN 5.5V, 0mA IOUT 400mA
V 0mA IOUT 400mA (Note 4)
mA
% VIN = 4.3V to 5.5V
REG(LOAD) Load Regulation
— -0.1 — % IOUT = 0.1mA to 400mA
-1.5 +0.5
VDR Drive Voltage
VIN - 0.2
VIN - 0.3
VIN - 0.1
35
150
200
V 4.3V VIN 5.5V, IDR = 200µA
mV VIN < VTH(LO), IDR = 200µA
Note
1: Ensured by design.
2: See 5V Detect Thresholds, Figure 4-1.
3: Recommended source impedance for 5V supply: 0.25. This will ensure that IOUT x RSOURCE < VHYST, thus avoiding DR toggling during
5V detect threshold transitions.
4: In Application Circuit, Figure 3-1.
5: See Timing Diagram, Figure 4-2.
6: Ground Current is independent of ILOAD.
DS21378B-page 2
© 2002 Microchip Technology Inc.


Part Number TC1267
Description 400mA PCI LDO
Maker Microchip Technology
Total Page 14 Pages
PDF Download
TC1267 pdf
Download PDF File
TC1267 pdf
View for Mobile






Related Datasheet

1 TC126 (TC125) PFM Step-Up DC/DC Regulators Microchip Technology
Microchip Technology
TC126 pdf
2 TC1262 500mA Fixed Output CMOS LDO Microchip Technology
Microchip Technology
TC1262 pdf
3 TC1263 500mA Fixed Output CMOS LDO with Shutdown Microchip Technology
Microchip Technology
TC1263 pdf
4 TC1264 800mA Fixed Output CMOS LDO Microchip Technology
Microchip Technology
TC1264 pdf
5 TC1265 800 mA Fixed-Output CMOS LDO with Shutdown Microchip Technology
Microchip Technology
TC1265 pdf
6 TC1267 400mA PCI LDO Microchip Technology
Microchip Technology
TC1267 pdf
7 TC1268 500mA Fixed Output / Fast Response CMOS LDO with Shutdown Microchip Technology
Microchip Technology
TC1268 pdf
8 TC1269 300mA CMOS LDO with Shutdown and VREF Bypass Microchip Technology
Microchip Technology
TC1269 pdf




Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

site map

webmaste! click here

contact us

Buy Components