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PDF LT1585ACT Data sheet ( Hoja de datos )
| Número de pieza | LT1585ACT | |
| Descripción | 5A Low Dropout Fast Response Positive Regulators Adjustable and Fixed | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1585A/LT1585A-3.3
5A Low Dropout
Fast Response
Positive Regulators
Adjustable and Fixed
FEATURES
s Fast Transient Response
s Guaranteed Dropout Voltage at Multiple Currents
s Load Regulation: 0.05% Typ
s Trimmed Current Limit
s On-Chip Thermal Limiting
s Standard 3-Pin Power Package
U
APPLICATIONS
s Pentium® Processor Supplies
s PowerPCTM Supplies
s Other 2.5V to 3.6V Microprocessor Supplies
s Low Voltage Logic Supplies
s Battery-Powered Circuitry
s Post Regulator for Switching Supply
LT1585ACT
LT1585ACT-3.3
Adjustable
3.3V Fixed
DESCRIPTION
The LT®1585A/LT1585A-3.3 are low dropout 3-terminal
regulators with 5A output current capability. Design has
been optimized for low voltage applications where tran-
sient response and minimum input voltage are critical.
Similar to the LT1084 family, these regulators feature
lower dropout voltage and faster transient response.
These improvements make them ideal for low voltage
microprocessor applications requiring a regulated 2.5V to
3.6V output with an input supply below 7V.
Current limit is trimmed to ensure specified output current
and controlled short-circuit current. On-chip thermal lim-
iting provides protection against any combination of over-
load that would create excessive junction temperatures.
The LT1585A/LT1585A-3.3 are available in the industry
standard 3-pin TO-220 power package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.
TYPICAL APPLICATION
3.3V, 5A Regulator
VIN ≥ 4.75V
+ C1
10µF
LT1585A-3.3
3.3V
5A
+ C2*
10µF
* REQUIRED FOR STABILITY
1585A TA01
NOTE: MICROPROCESSOR APPLICATIONS WITH LOAD TRANSIENTS OF 3.8A REQUIRE
OUTPUT DECOUPLING CAPACITANCE >1300µF ON FIXED VOLTAGE PARTS TO ACHIEVE
< 50mV OF DEVIATION FROM NOMINAL OUTPUT. CONSULT FACTORY FOR DETAILS
Dropout Voltage vs Output Current
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0
OUTPUT CURRENT (A)
IFULL LOAD
LT1585A TA02
1
1 page  
WW
SI PLIFIED SCHE ATIC
VIN
LT1585A/LT1585A-3.3
+
–
THERMAL
LIMIT
ADJ
GND
FOR FIXED VOLTAGE DEVICE
VOUT
LT1585A • BD
APPLICATIONS INFORMATION
General
The LT1585A/LT1585A-3.3 3-terminal regulators are
easy to use and have all the protection features expected
in high performance linear regulators. The devices are
short-circuit protected, safe-area protected and provide
thermal shutdown to turn off the regulators should the
junction temperature exceed about 150°C. The regulators
include an adjustable and a fixed 3.3V version.
These ICs are pin compatible with the LT1083/LT1084/
LT1085 family of linear regulators but offer lower dropout
voltage and faster transient response. The trade-off for this
improved performance is a 7V maximum supply voltage.
Similar to the LT1083/LT1084/LT1085 family, the
LT1585A/LT1585A-3.3 regulators require an output ca-
pacitor for stability. However, the improved frequency
compensation permits the use of capacitors with much
lower ESR while still maintaining stability. This is critical in
addressing the needs of modern, low voltage, high speed
microprocessors.
Current generation microprocessors cycle load current
from almost zero to amps in tens of nanoseconds. Output
voltage tolerances are tighter and include transient re-
sponse as part of the specification. The LT1585A/
LT1585A-3.3 are specifically designed to meet the fast
current load-step requirements of these microprocessors
and save total cost by needing less output capacitance in
order to maintain regulation.
Stability
The circuit design in the LT1585A/LT1585A-3.3 requires
the use of an output capacitor as part of the frequency
compensation. For all operating conditions, the addition
of a 22µF solid tantalum or a 100µF aluminum electrolytic
on the output ensures stability. Normally, the LT1585A/
LT1585A-3.3 can use smaller value capacitors. Many
different types of capacitors are available and have widely
varying characteristics. These capacitors differ in capaci-
5
5 Page 
TYPICAL APPLICATIONS N
LT1585A/LT1585A-3.3
Guaranteed LT1585A Circuit for the Intel 100MHz and Higher Frequency Pentium Processors
(Meets Intel Specifications with Worst-Case Tolerances)
THERMALLOY
5V 7021B-MT
SEE NOTE 5
+
C2 TO C4
220µF
10V
AVX TPS
3 EACH
3
IN
2
OUT
LT1585A
SEE NOTE 6 R4
R1
ADJ 1k
1
C6
R2 0.01µF
1k R3D 5 R3E 6
C5
33pF
NPO
2
1
COMP COL
3 V+
8
REF
4 LT1431S 7
RT RM
C1 SGND FGND
83Ω 117Ω
SEE NOTE 7
4
R3C
800Ω
3
R3B
1.35k
2
0.1µF
56
R3A
1.15k
1 SGND
PGND
VOUT
SENSE
+ C7
100µF
10V
PGND
LT1584 • TA06
PLACE IN MICROPROCESSOR
SOCKET CAVITY
C8 TO C13
C14 TO C23
+ 100µF + 1µF
10V 16V
AVX TPS
AVX Y5V 0805
4 EACH
24 EACH
NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTOR VALUES ARE OHMS,
1/8W, 5%
2. ALL CAPACITORS ARE 50V, 20%
3. ALL POLARIZED CAPACITORS ARE AVX
TYPE TPS OR EQUIVALENT
4. INPUT CAPACITANCE MAY BE REDUCED
IF THE 5V SUPPLY IS WELL BYPASSED
5. FOR 100MHz PENTIUM PROCESSOR,
INPUT VOLTAGE MUST BE AT LEAST
4.85V AT THE REGULATOR INPUT
6. FOR PENTIUM VRE PROCESSOR,
R4 NOT INSTALLED
– FOR 3.3V OUTPUT, INSTALL 0Ω JUMPER
RESISTOR R4
7. R3A TO R3E ARE B.I. TECHNOLOGY 627V100
LT1585A/LT1431 Transient Response
for 3.8A Load Current Step*
VOUT
50mV/DIV
IOUT
2A/DIV
100µs/DIV
LT1584A • TA06
*TRANSIENT RESPONSE MEASURED WITH AN INTEL
POWER VALIDATOR. VOUT IS MEASURED AT THE
POWER VALIDATOR
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT1585ACT.PDF ] | |
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