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Linear Technology Electronic Components Datasheet

LT1585A-1.5 Datasheet

Fixed 1.5V/ 4.6A and 5A Low Dropout/ Fast Response GTL+ Regulators

No Preview Available !

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
VIN VOUT
GND
VTT = 1.5V
5A
C1, C2
100µF
10V
+ C3 TO C6
100µF
10V
Intel Processor GTL+ Supply
C7 TO
C12
1µF
R1
75VREF
R2
150
C13
0.1µF
R5
100
R7 R8 R6
100100100VREF
R3
75
R4
150
C14
0.1µF
RX
TX Q1
RX
Q2 TX
RX
NOTE: LTC RECOMMENDS CENTRALLY
LOCATING THE LT1585A-1.5 TO MINIMIZE
VTT DISTRIBUTION DROPS AND USING
SEPARATE VREF GENERATORS AT EACH
BUS END
TX
Q3 Q4
142 TOTAL SIGNAL LINES
RX
TX
1585-1.5 • TA01
1


Linear Technology Electronic Components Datasheet

LT1585A-1.5 Datasheet

Fixed 1.5V/ 4.6A and 5A Low Dropout/ Fast Response GTL+ Regulators

No Preview Available !

LT1585-1.5/LT1585A-1.5
ABSOLUTE MAXIMUM RATINGS (Note 1)
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
TAB
IS
OUTPUT
FRONT VIEW
3
2
1
VIN
VOUT
GND
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
ORDER PART
NUMBER
LT1585CM-1.5
LT1585ACM-1.5
Consult factory for Industrial and Military grade parts.
TAB IS
OUTPUT
FRONT VIEW
3
2
1
T PACKAGE
3-LEAD PLASTIC TO-220
θJA = 50°C/W
ORDER PART
NUMBER
VIN
VOUT LT1585CT-1.5
GND LT1585ACT-1.5
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the specified operating
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Output Voltage (Note 4)
Line Regulation (Notes 2, 3)
Load Regulation
(Notes 2, 3, 4)
VIN = 5V, TJ = 25°C, IOUT = 0mA
3V VIN 7V, 0mA IOUT IFULL LOAD
3V VIN 7V, IOUT = 0mA
VIN = 5V, TJ = 25°C, 0mA IOUT IFULL LOAD
1.485 (– 1%) 1.5 1.515 (+ 1%)
q 1.470 (– 2%) 1.5 1.530 (+ 2%)
0.005
0.2
0.05 0.3
q 0.05 0.5
V
V
%
%
%
Dropout Voltage (Note 4)
Current Limit
Quiescent Current
Ripple Rejection (Note 4)
Thermal Regulation
Temperature Stability
VOUT = 1%, IOUT = IFULL LOAD
q
1.200 1.400
V
LT1585-1.5, (VIN – VOUT) = 5.5V
LT1585A-1.5, (VIN – VOUT) = 5.5V
q 4.60
q 5.00
5.25
6.00
A
A
VIN = 5V
q
7 13
mA
f = 120Hz, COUT = 25µF Tant., VIN = 4.5V, IOUT = IFULL LOAD q
60
72
dB
TA = 25°C, 30ms Pulse
0.004
0.02
%/ W
q 0.5
%
Long-Term Stability
RMS Output Noise
(% of VOUT)
Thermal Resistance
Junction to Case
TA = 125°C, 1000 Hrs.
TA = 25°C, 10Hz f 10kHz
T Package: Control Circuitry/Power Transistor
M Package: Control Circuitry/Power Transistor
0.03
0.003
1.0
0.7/3.0
0.7/3.0
%
%
°C/ W
°C/ W
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: 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 3: Line and load regulation are guaranteed up to the maximum
power dissipation (25W for the LT1585-1.5 in T package and 27.5W for
the LT1585A-1.5). 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 4: 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 4.6A for the
LT1585-1.5 and 5A for the LT1585A-1.5. The LT1585-1.5/LT1585A-1.5
have constant current limit with changes in input-to-output voltage.
2


Part Number LT1585A-1.5
Description Fixed 1.5V/ 4.6A and 5A Low Dropout/ Fast Response GTL+ Regulators
Maker Linear Technology
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LT1585A-1.5 Datasheet PDF






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