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Número de pieza EZ1581CT
Descripción DUAL INPUT LOW DROPOUT REGULATOR
Fabricantes Semtech Corporation 
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DUAL INPUT
LOW DROPOUT REGULATOR
EZ1580/EZ1581
EZ1582/EZ1583
February 26, 1999
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The EZ158X family of high performance positive
voltage regulators are designed for use in applications
requiring very low dropout voltage at 7, 5, 3 and 1.5
amps. When supplying 2.5V on motherboards where
both 5V and 3.3V supplies are available, the superior
dropout characteristics of the EZ158X result in reduced
heat dissipation compared to regular LDOs, thus
allowing heat sink size reduction. Additionally, the
EZ158X provides excellent regulation over variations in
line, load and temperature. Remote sense operation
allows compensating for trace, connector and other
resistive losses.
Outstanding features include very low dropout
performance at rated current, fast transient response,
remote sense, internal current limiting, thermal
shutdown and safe operating area protection of the
output device. The EZ158X is a five terminal
adjustable voltage regulator available in the popular 5
pin TO-220 and TO-263 plastic packages.
ORDERING INFORMATION
DEVICE
PACKAGE IOUT (A)
VOUT (V)
EZ1580CT-X.X TO-220,
7 See Note (1)
EZ1581CT-X.X 5-pin
5
EZ1582CT-X.X
3
EZ1583CT-X.X
1.5
EZ1580CM-X.X TO-263,
EZ1581CM-X.X 5-pin(2)
7 See Note (1)
5
EZ1582CM-X.X
3
EZ1583CM-X.X
1.5
Notes:
(1) Where -X.X denotes voltage options. Available
voltages are: 1.5V and 2.5V. Leave blank for ad-
justable version (1.3 to 5.7V).
(2) Add suffix ‘TR’ for tape and reel (TO-263).
FEATURES
= 540mV dropout @ 7A in dual supply mode
(EZ1580)
= Remote sense operation
= Fast transient response
= 0.5% initial accuracy
= 5 Pin TO-220 and TO-263 packages
APPLICATIONS
= Microprocessor supplies
= Split plane microprocessor supplies
= Pentium® Processor P54C and P55C
= PowerPC™ 603/604EV
= AMD5K86™, AMD K6
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol Maximum
Input Voltage
VPOWER
VCONTROL
Power
Dissipation
VP 7
VC 13.2
PD Internally
Limited
Thermal Resistance
Junction to Case
EZ1580/1 TO-220
EZ1580/1 TO-263
EZ1582/3 TO-220
EZ1582/3 TO-263
θJC
2
2
3
3
Thermal Resistance
Junction to Ambient
EZ158X TO-220
EZ158X TO-263
θJA
50
60
Operating Junction
TJ 0 to 125
Temperature Range
Storage Temperature
Range
Lead Temperature
(Soldering) 10 Sec.
TSTG
TLEAD
-65 to 125
260
Units
V
W
°C/W
°C/W
°C
°C
°C
© 1999 SEMTECH CORP.
Pentium is a registered trademark of Intel Corporation.
PowerPC is a trademark of IBM.
AMD5K86 and K6 are trademarks of Advanced Micro Devices.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320

1 page




EZ1581CT pdf
DUAL INPUT
LOW DROPOUT REGULATOR
EZ1580/EZ1581
EZ1582/EZ1583
February 26, 1999
APPLICATION INFORMATION
The EZ158X is a low dropout regulator designed to
power the next generation of low voltage, split voltage
plane processors, such as the Pentium® Processor
P55C, the IBM PowerPC™ 603EV and 604EV and the
AMD5K86™ and K6 Processors.
The dropout voltage is minimized by utilizing a
separate input voltage, VCONTROL, which should exceed
VOUT by at least 1.3V. The 2.5V power for the load
(microprocessor core) can be derived from a 3.3V
system supply. Since the efficiency of a linear regulator
is the ratio of the output to the input voltage, heat
dissipation is reduced by using a 3.3 input, thereby
lowering heatsink and cooling fan costs. For a load of
7A at 2.5V, the regulator would dissipate 17.5W when
converting from 5V, but only 5.6W from a 3.3V input.
Remote Kelvin sensing of the output voltage can be
achieved by connecting the sense pin to the output at
the load. Remote sensing will reduce errors
associated with resistive trace losses between
regulator and processor.
DEVICE OUTLINE - TO-220, 5 PIN
DEVICE OUTLINE - TO-263, 5 PIN
MINIMUM LAND PATTERN - TO-263, 5 PIN
© 1999 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA 91320

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