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Linear Technology Electronic Components Datasheet

LT1585 Datasheet

Low Dropout Fast Response Positive Regulators

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LT1584/LT1585/LT1587
7A, 4.6A, 3A 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% Typical
s Trimmed Current Limit
s On-Chip Thermal Limiting
s Standard 3-Pin Power Package
U
APPLICATIO S
s PentiumTM 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
LT1585/7CM, LT1584/5/7CT
LT1585/7CM-3.3, LT1584/5/7CT-3.3
LT1585CM-3.38, LT1584/5CT-3.38
LT1585/7CM-3.45, LT1584/5/7CT-3.45
LT1585/7CM-3.6, LT1584/5/7CT-3.6
Adjustable
3.3V Fixed
3.38V Fixed
3.45V Fixed
3.6V Fixed
DESCRIPTIO
The LT®1584/LT1585/LT1587 are low dropout three-
terminal regulators with 7A, 4.6A and 3A output current
capability, respectively. Design has been optimized for low
voltage applications where transient response and mini-
mum input voltage are critical. Similar to the LT1083/4/5
family, it has lower dropout voltage and faster transient
response. These improvements make it ideal for low volt-
age 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 LT1585/LT1587 are available in both the through-hole
and surface mount versions of the industry standard 3-pin
TO-220 power package. The LT1584 is available in the
through-hole 3-pin TO-220 power package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.
TYPICAL APPLICATIO
3.3V, 7A, 4.6A, 3A Regulator
VIN 4.75V
+ C1
10µF
LT1584-3.3
LT1585-3.3
LT1587-3.3
3.3V
7A, 4.6A, 3A
+ C2*
SOLID
TANTALUM
* REQUIRED FOR STABILITY
LT1584: C2 = 22µF,
LT1585/LT1587: C2 = 10µF
1585 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
1585 TA02
158457a
1


Linear Technology Electronic Components Datasheet

LT1585 Datasheet

Low Dropout Fast Response Positive Regulators

No Preview Available !

LT1584/LT1585/LT1587
ABSOLUTE AXI U RATI GS
(Note 1)
VIN ............................................................................. 7V
Operating Junction Temperature Range
C-Grade
Control Section ................................... 0°C to 125°C
Power Transistor ................................. 0°C to 150°C
I-Grade
Control Section ............................... –40°C to 125°C
Power Transistor ............................. –40°C to 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PRECONDITIONI G
100% Thermal Limit Functional Test
PACKAGE/ORDER INFORMATION
TAB
IS
OUTPUT
FRONT VIEW
3
2
1
M PACKAGE
3-LEAD PLASTIC DD
θJA = 30°C/W*
VIN
VOUT
ADJ
ORDER PART
NUMBER
LT1585CM
LT1587CM
TAB
IS
OUTPUT
FRONT VIEW
3
2
1
T PACKAGE
3-LEAD PLASTIC TO-220
θJA = 50°C/W
VIN
VOUT
ADJ
ORDER PART
NUMBER
LT1584CT
LT1585CT
LT1587CT
TAB
IS
OUTPUT
FRONT VIEW
3
2
1
M PACKAGE
3-LEAD PLASTIC DD
θJA = 30°C/W*
VIN
VOUT
GND
LT1585CM-3.3
LT1585CM-3.38
LT1585CM-3.45
LT1585CM-3.6
LT1587CM-3.3
LT1587CM-3.45
LT1587CM-3.6
TAB
IS
OUTPUT
LT1584CT-3.3
LT1584IT-3.3
FRONT VIEW
LT1585CT-3.3
3
VIN
LT1587CT-3.3
LT1584CT-3.38
2 VOUT LT1585CT-3.38
LT1584CT-3.45
1 GND LT1585CT-3.45
LT1587CT-3.45
T PACKAGE
3-LEAD PLASTIC TO-220
LT1584CT-3.6
θJA = 50°C/W
LT1585CT-3.6
LT1587CT-3.6
* With package soldered to 0.5 square inch copper area over backside
ground plane or internal power plane. θJA can vary from 20°C/W to
> 40°C/W with other mounting techniques.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
158457a
2


Part Number LT1585
Description Low Dropout Fast Response Positive Regulators
Maker Linear Technology
PDF Download

LT1585 Datasheet PDF






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