LT1585-1.5_15 Datasheet, PDF (1/8 Pages) Linear Technology – Fixed 1.5V, 4.6A and 5A Low Dropout, Fast Response GTL Regulators

LT1585-1.5/LT1585A-1.5
Fixed 1.5V, 4.6A and 5A
Low Dropout, Fast Response
GTL+ Regulators
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}
U
APPLICATIO S
s _{GTL+ Power Supply}
s _{Low Voltage Logic Supplies}
s _{Battery-Powered Circuitry}
DESCRIPTIO
The LT^®1585-1.5/LT1585A-1.5 are low dropout, 3-termi-
nal regulators with 4.6A and 5A output current capability
respectively, and a fixed 1.5V output voltage. The designs
are optimized for low voltage applications where transient
response and minimum input voltage are critical. Similar to
the LT1084, they have lower dropout and faster transient
response. These improvements make them ideal for low
voltage microprocessor applications, especially as the
regulator in an Intel processor GTL+ supply.
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 creates excessive junction temperatures.
The LT1585-1.5/LT1585A-1.5 are available in the through-
hole 3-pin TO-220 power package and 3-pin plastic DD.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
3.3V
+
LT1585A-1.5
V_IN
V_OUT
GND
V_TT = 1.5V
5A
C1, C2
100µF
10V
+ C3 TO C6
100µF
10V
Intel Processor GTL+ Supply
C7 TO
C12
1µF
R1
75Ω _VREF
R2
150Ω
C13
0.1µF
R5
100Ω
R7
R8
R6
100Ω 100Ω 100Ω ^VREF
R3
75Ω
R4
150Ω
C14
0.1µF
RX
TX
Q1
RX
Q2
TX
RX
NOTE: LTC RECOMMENDS CENTRALLY
LOCATING THE LT1585A-1.5 TO MINIMIZE
V_TT DISTRIBUTION DROPS AND USING
TX
SEPARATE V_REF GENERATORS AT EACH
BUS END
Q3
•
Q4
•
•
142 TOTAL SIGNAL LINES
RX
TX
1585-1.5 • TA01
1