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Linear Technology Electronic Components Datasheet

LT1587-1.5 Datasheet

Fixed 1.5V/ 3A Low Dropout Fast Response GTL + Regulator

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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
APPLICATIONS
s Intel Pentium® Pro Processor GTL+ Supply
s Low Voltage Logic Supplies
s Battery-Powered Circuitry
LT1587-1.5
Fixed 1.5V, 3A
Low Dropout
Fast Response
GTL+ Regulator
DESCRIPTION
The LT®1587-1.5 is a low dropout 3-terminal regulator
with a fixed 1.5V output voltage and 3A output current
capability. The design is optimized for low voltage applica-
tions where transient response and minimum input voltage
are critical. Similar to the LT1085, it has lower dropout and
faster transient response. These improvements make it
ideal for low voltage microprocessor applications, espe-
cially as the regulator in an Intel Pentium Pro 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 LT1587-1.5 is available in both the through-hole and
surface mount versions of 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
TYPICAL APPLICATION
Intel Pentium Pro Processor GTL+ Supply
3.3V
+
LT1587-1.5
VIN VOUT
GND
VTT = 1.5V
3A
C1
100µF
10V
AVX TPS
+
C2, C3
100µF
10V
AVX TPS
C4 TO
C6
1µF
R1
75VREF
R2
150
C13
0.1µF
R5 R7
100100
R8
100
R6
100
VREF
R3
75
C14 R4
0.1µF 150
VTT = 1.5V
3A
LT1587-1.5
VOUT
VIN
GND
C10 TO C12
1µF
+ C8, C9
100µF
10V
AVX TPS
+
3.3V
C7
100µF
10V
AVX TPS
RX
TX Q1
RX
Q2 TX
RX RX
NOTE: LTC RECOMMENDS SEPARATE
TX Q3
Q4
TX
VTT GENERATORS AT EACH BUS END
TO ENSURE CURRENT SHARING
• BETWEEN THE REGULATORS AND TO
MINIMIZE VTT DISTRIBUTION DROPS
142 TOTAL SIGNAL LINES
LT1587 • TA01
1


Linear Technology Electronic Components Datasheet

LT1587-1.5 Datasheet

Fixed 1.5V/ 3A Low Dropout Fast Response GTL + Regulator

No Preview Available !

LT1587-1.5
ABSOLUTE MAXIMUM RATINGS
VIN ............................................................................. 7V
Operating Junction Temperature Range
Control Section.................................... 0°C to 125°C
Power Transistor ................................. 0°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
FRONT VIEW
3
2
1
VIN
VOUT
GND
ORDER PART
NUMBER
LT1587CM-1.5
M PACKAGE
3-LEAD PLASTIC DD
θJA = 30°C/W*
* 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.
FRONT VIEW
3
2
1
ORDER PART
VIN NUMBER
VOUT
GND LT1587CT-1.5
T PACKAGE
3-LEAD PLASTIC TO-220
θJA = 50°C/W
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
PARAMETER
Output Voltage
Line Regulation (Notes 1, 2)
Load Regulation
(Notes 1, 2, 3)
Dropout Voltage
Current Limit (Note 3)
Quiescent Current
Ripple Rejection
Thermal Regulation
Temperature Stability
Long-Term Stability
RMS Output Noise
(% of VOUT)
Thermal Resistance
Junction to Case
CONDITIONS
VIN = 5V, TJ = 25°C, IOUT = 0mA
3V VIN 7V, 0mA IOUT 3A
3V VIN 7V, IOUT = 0mA
VIN = 5V, TJ = 25°C, 0mA IOUT IFULL LOAD
VOUT = 1%, IOUT = 3A
(VIN – VOUT) = 5.5V
VIN = 5V
f = 120Hz, COUT = 25µF Tant., VIN = 4.5V, IOUT = 3A
TA = 25°C, 30ms pulse
TA = 125°C, 1000 Hrs.
TA = 25°C, 10Hz f 10kHz
T Package: Control Circuitry/Power Transistor
M Package: Control Circuitry/Power Transistor
MIN TYP MAX UNITS
1.485 (– 1%) 1.5 1.515 (+ 1%)
q 1.470 (– 2%) 1.5 1.530 (+ 2%)
V
V
0.005
0.2
%
0.05 0.3
%
q
0.05 0.5
%
q
1.150 1.300
V
q 3.100 3.750
A
q
7 13
mA
q 60
72
dB
0.004
0.02
%/ W
q 0.5
%
0.03 1.0
%
0.003
%
0.7/3.0
0.7/3.0
°C/ W
°C/ W
The q denotes specifications which apply over the specified operating
temperature range.
Note 1: See thermal regulation specifications for changes in output voltage
due to heating effects. Load and line regulation are measured at a constant
junction temperature by low duty cycle pulse testing.
Note 2: Line and load regulation are guaranteed up to the maximum
power dissipation (17W for the LT1587-1.5 in T package). Power
dissipation is determined by input/output differential and the output
current. Guaranteed maximum output power will not be available over
the full input/output voltage range.
Note 3: IFULL LOAD is defined as the maximum value of output load current
as a function of input-to-output voltage. IFULL LOAD is equal to 3A. The
LT1587-1.5 has constant current limit with changes in input-to-output
voltage.
2


Part Number LT1587-1.5
Description Fixed 1.5V/ 3A Low Dropout Fast Response GTL + Regulator
Maker Linear Technology
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