LT1585A Datasheet, PDF (1/12 Pages) ON Semiconductor – 5A LOW DROPOUT FAST RESPONSE POSITIVE ADJUSTABLE AND FIXED VOLTAGE REGULATOR

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 _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}
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
V_IN ≥ 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)
I_{FULL LOAD}
LT1585A TA02
1