T1587_15 Datasheet, PDF (1/16 Pages) Linear Technology – 7A, 4.6A, 3A Low Dropout Fast Response Positive Regulators Adjustable and Fixed

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 _Pentium^TM _{Processor Supplies}
s _PowerPC^TM _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
V_IN ≥ 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)
I_{FULL LOAD}
1585 TA02
158457a
1