LT1584.pdf

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LT1584/LT1585/LT1587
7A, 4.6A, 3A Low Dropout
Fast Response
Positive Regulators
Adjustable and Fixed
FEATURES
DESCRIPTIO N
n
Fast Transient Response
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.
n
Guaranteed Dropout Voltage at Multiple Currents
n
Load Regulation: 0.05% Typ
n
Trimmed Current Limit
n
On-Chip Thermal Limiting
n
Standard 3-Pin Power Package
APPLICATIO N S
U
n
Pentium TM Processor Supplies
PowerPC TM Supplies
n
n
Other 2.5V to 3.6V Microprocessor Supplies
n
Low Voltage Logic Supplies
n
Battery-Powered Circuitry
n
Post Regulator for Switching Supply
LT1585/7CM, LT1584/5/7CT
Adjustable
LT1585/7CM-3.3, LT1584/5/7CT-3.3
3.3V Fixed
LT1585CM-3.38, LT1584/5CT-3.38
3.38V Fixed
LT1585/7CM-3.45, LT1584/5/7CT-3.45
3.45V Fixed
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.
LT1585/7CM-3.6, LT1584/5/7CT-3.6
3.6V Fixed
TYPICAL APPLICATIO N
Dropout Voltage vs Output Current
3.3V, 7A, 4.6A, 3A Regulator
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
V IN ³ 4.75V
LT1584-3.3
LT1585-3.3
LT1587-3.3
3.3V
7A, 4.6A, 3A
+
+
C1
10
C2*
SOLID
TANTALUM
m
F
* REQUIRED FOR STABILITY
LT1584: C2 = 22 m F,
LT1585/LT1587: C2 = 10 m F
1585 TA01
F ON FIXED VOLTAGE PARTS TO ACHIEVE
< 50mV OF DEVIATION FROM NOMINAL OUTPUT. CONSULT FACTORY FOR DETAILS
m
0
I FULL LOAD
OUTPUT CURRENT (A)
1585 TA02
1
NOTE: MICROPROCESSOR APPLICATIONS WITH LOAD TRANSIENTS OF 3.8A REQUIRE
OUTPUT DECOUPLING CAPACITANCE > 1300
23708098.046.png 23708098.047.png 23708098.048.png 23708098.049.png
LT1584/LT1585/LT1587
ABSOLUTE M AXI M U M RATINGS
V IN ............................................................................. 7V
Operating Junction Temperature Range
Control Section.................................... 0
Storage Temperature Range ................. – 65
°
C to 150
°
C
Lead Temperature (Soldering, 10 sec) .................. 300
°
C
°
C to 125
°
C
PRECO N DITIO N I G
Power Transistor ................................. 0
°
C to 150
°
C
100% Thermal Limit Functional Test
PACKAGE/ORDER I N FOR M ATIO N
FRONT VIEW
ORDER PART
NUMBER
FRONT VIEW
ORDER PART
NUMBER
3
V IN
3
2
V IN
V OUT
ADJ
2
V OUT
1
ADJ
LT1585CM
LT1587CM
1
LT1584CT
LT1585CT
LT1587CT
M PACKAGE
3-LEAD PLASTIC DD PAK
T PACKAGE
3-LEAD PLASTIC TO-220
q JA = 30
°
C/ W*
q JA = 50
°
C/ W
FRONT VIEW
LT1585CM-3.3
LT1585CM-3.38
LT1585CM-3.45
LT1585CM-3.6
LT1587CM-3.3
LT1587CM-3.45
LT1587CM-3.6
FRONT VIEW
3
V IN
3
2
1
V IN
V OUT
GND
LT1584CT-3.3
LT1585CT-3.3
LT1587CT-3.3
LT1584CT-3.38
LT1585CT-3.38
LT1584CT-3.45
LT1585CT-3.45
LT1587CT-3.45
LT1584CT-3.6
LT1585CT-3.6
LT1587CT-3.6
2
V OUT
1
GND
M PACKAGE
3-LEAD PLASTIC DD PAK
T PACKAGE
3-LEAD PLASTIC TO-220
q JA = 30
°
C/ W*
q JA = 50
°
C/W
* With package soldered to 0.5 square inch copper area over backside
ground plane or internal power plane.
Consult factory for Industrial and Military grade parts.
q JA can vary from 20
°
C/W to
>40
°
C/ W with other mounting techniques.
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reference Voltage LT1584
1.5V £ (V IN – V OUT ) £ 3V, 10mA £ I OUT £ 7A
LT1585
1.5V
£
(V IN – V OUT )
£
5.75V, 10mA
£
I OUT
£
4.6A, T J
³
25
°
C
1.5V
£
(V IN – V OUT )
£
5.75V, 10mA
£
I OUT
£
4A, T J < 25
°
C
LT1587
1.5V £ (V IN – V OUT ) £ 5.75V, 10mA £ I OUT £ 3A
l
1.225 (– 2%)
1.250 1.275 (+ 2%)
V
Output Voltage
LT1584-3.3
4.75V £ V IN £ 6.3V, 0mA £ I OUT £ 7A
LT1585-3.3
4.75V £ V IN £ 7V, 0mA £ I OUT £ 4.6A, T J ³ 25 ° C
4.75V £ V IN £ 7V, 0mA £ I OUT £ 4A, T J < 25 ° C
LT1587-3.3
4.75V £ V IN £ 7V, 0mA £ I OUT £ 3A
l
3.235 (– 2%)
3.300 3.365 (+ 2%)
V
LT1584-3.38 4.75V £ V IN £ 6.38V, 0mA £ I OUT £ 7A
LT1585-3.38 4.75V £ V IN £ 7V, 0mA £ I OUT £ 4A
l
3.313 (– 2%)
3.380 3.465 (+ 2.5%)
V
LT1584-3.45 4.75V £ V IN £ 6.45V, 0mA £ I OUT £ 7A
LT1585-3.45 4.75V £ V IN £ 7V, 0mA £ I OUT £ 4A
LT1587-3.45 4.75V £ V IN £ 7V, 0mA £ I OUT £ 3A
l
3.381 (– 2%)
3.450 3.519 (+ 2%)
V
LT1584-3.6
4.75V
£
V IN
£
7V, 0mA
£
I OUT
£
6A
l
3.400 (– 5.5%) 3.600 3.672 (+ 2%)
V
LT1584-3.6
4.80V £ V IN £ 7V, 0mA £ I OUT £ 6A
l
3.450 (– 4%)
3.600 3.672 (+ 2%)
V
LT1584-3.6
4.80V £ V IN £ 6.6V, 0mA £ I OUT £ 7A
l
3.431 (– 4.7%) 3.600 3.672 (+ 2%)
V
LT1584-3.6
4.85V
£
V IN
£
6.6V, 0mA
£
I OUT
£
7A
l
3.481 (– 3.3%) 3.600 3.672 (+ 2%)
V
2
23708098.001.png 23708098.002.png 23708098.003.png 23708098.004.png 23708098.005.png 23708098.006.png 23708098.007.png 23708098.008.png 23708098.009.png 23708098.010.png 23708098.011.png 23708098.012.png 23708098.013.png
LT1584/LT1585/LT1587
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage
LT1585/7-3.6
4.75V £ V IN £ 7V , 0mA £ I OUT £ 3A
l
3.474 (– 3.5%) 3.600 3.672 (+ 2%)
V
LT1585/7-3.6
4.80V £ V IN £ 7V , 0mA £ I OUT £ 3A
l
3.528 (– 2%)
3.600 3.672 (+ 2%)
V
LT1585-3.6
4.80V £ V IN £ 7V , 0mA £ I OUT £ 4A
l
3.450 (– 4%)
3.600 3.672 (+ 2%)
V
LT1585-3.6
4.85V £ V IN £ 7V , 0mA £ I OUT £ 4A
l
3.492 (– 3%)
3.600 3.672 (+ 2%)
V
Line Regulation
LT1584/5/7
2.75V
£
V IN
£
7V, I OUT = 10mA
(Notes 1, 2)
LT1584/5/7-3.3 4.75V
£
V IN
£
7V, I OUT = 0mA
LT1584/5-3.38
4.75V
£
V IN
£
7V, I OUT = 0mA
LT1584/5/7-3.45 4.75V
£
V IN
£
7V, I OUT = 0mA
LT1584/5/7-3.6 4.75V
£
V IN
£
7V, I OUT = 0mA
l
0.005
0.2
%
Load Regulation
LT1584/5/7
(V N – V OUT ) = 3V, T J = 25 ° C, 10mA £ I OUT £ I FULL LOAD
(Notes 1, 2, 3)
LT1584/5/7-3.3 V IN = 5V, T J = 25 ° C, 0mA £ I OUT £ I FULL LOAD
LT1584/5-3.38 V IN = 5V, T J = 25 ° C, 0mA £ I OUT £ I FULL LOAD
LT1584/5/7-3.45 V IN = 5V, T J = 25 ° C, 0mA £ I OUT £ I FULL LOAD
LT1584/5/7-3.6 V IN = 5.25V, T J = 25 ° C, 0mA £ I OUT £ I FULL LOAD
0.05
0.3
%
l
0.05
0.5
%
Dropout Voltage
LT1585/7
D V REF = 1%, I OUT = 3A
LT1585/7-3.3
D
V OUT = 1%, I OUT = 3A
LT1585-3.38
D V OUT = 1%, I OUT = 3A
LT1585/7-3.45
D V OUT = 1%, I OUT = 3A
LT1585/7-3.6
D
V OUT = 1%, I OUT = 3A
l
1.150
1.300
V
LT1585
D
V REF = 1%, I OUT = 4.6A, T J
³
25
°
C
D
V REF = 1%, I OUT = 4A, T J < 25
°
C
LT1585-3.3
D
V OUT = 1%, I OUT = 4.6A, T J
³
25
°
C
D
V OUT = 1%, I OUT = 4A, T J < 25
°
C
LT1585-3.38
D
V OUT = 1%, I OUT = 4A
LT1585-3.45
D
V OUT = 1%, I OUT = 4A
LT1585-3.6
D
V OUT = 1%, I OUT = 4A
l
1.200
1.400
V
LT1584
D V REF = 1%, I OUT = 6A
LT1584-3.3
D V OUT = 1%, I OUT = 6A
LT1584-3.38
D V OUT = 1%, I OUT = 6A
LT1584-3.45
D V OUT = 1%, I OUT = 6A
LT1584-3.6
D V OUT = 1%, I OUT = 6A
T J ³ 25 ° C
l
1.200
1.300
V
T J < 25 ° C
l
1.200
1.350
V
LT1584
D V REF = 1%, I OUT = 7A
LT1584-3.3
D
V OUT = 1%, I OUT = 7A
LT1584-3.38
D V OUT = 1%, I OUT = 7A
LT1584-3.45
D V OUT = 1%, I OUT = 7A
LT1584-3.6
D
V OUT = 1%, I OUT = 7A
l
1.250
1.400
V
Current Limit
LT1584
(V IN – V OUT ) = 3V
(Note 3)
LT1584-3.3
(V IN – V OUT ) = 3V
LT1584-3.38
(V IN – V OUT ) = 3V
LT1584-3.45
(V IN – V OUT ) = 3V
LT1584-3.6
(V IN – V OUT ) = 3V
l
7.100
8.250
A
LT1585
(V IN – V OUT ) = 5.5V
LT1585-3.3
(V IN – V OUT ) = 5.5V
T J ³ 25 ° C
l
4.600
5.25
A
T J < 25 ° C
l
4.100
5.25
A
LT1585-3.38
(V IN – V OUT ) = 5.5V
LT1585-3.45
(V IN – V OUT ) = 5.5V
LT1585-3.6
(V IN – V OUT ) = 5.5V
l
4.100
4.750
A
LT1587-3.3
(V IN – V OUT ) = 5.5V
LT1587-3.45
(V IN – V OUT ) = 5.5V
LT1587-3.6
(V IN – V OUT ) = 5.5V
l
3.100
3.750
A
3
LT1587
(V IN – V OUT ) = 5.5V
23708098.014.png 23708098.015.png 23708098.016.png 23708098.017.png
LT1584/LT1585/LT1587
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Adjust Pin Current
LT1584/5/7
l
55
120
m
Adjust Pin Current
LT1584
1.5V £ (V IN – V OUT ) £ 3V, 10mA £ I OUT £ I FULL LOAD
Change (Note 3)
LT1585/7
1.5V £ (V IN – V OUT ) £ 5.75V, 10mA £ I OUT £ I FULL LOAD
l
0.2
5
m A
Minimum
LT1584/5/7
1.5V
£
(V IN – V OUT )
5.75V
l
2
10
mA
Load Current
Quiescent Current
LT1584/5/7-3.3 V IN = 5V
LT1584/5-3.38 V IN = 5V
LT1584/5/7-3.45 V IN = 5V
LT1584/5/7-3.6 V IN = 5V
l
8
13
mA
Ripple Rejection
LT1584
f = 120Hz, C OUT = 25 m F Tant., (V IN – V OUT ) = 2.5V, I OUT = 7A
LT1584-3.3
f = 120Hz, C OUT = 25 m F Tant., V IN = 5.8V, I OUT = 7A
LT1584-3.38
f = 120Hz, C OUT = 25 m F Tant., V IN = 5.88V, I OUT = 7A
LT1584-3.45
f = 120Hz, C OUT = 25 m F Tant., V IN = 5.95V, I OUT = 7A
LT1584-3.6
f = 120Hz, C OUT = 25 m F Tant., V IN = 6.1V, I OUT = 7A
LT1585
f = 120Hz, C OUT = 25 m F Tant., (V IN – V OUT ) = 3V,
I OUT = 4.6A, T J ³ 25 ° C
f = 120Hz, C OUT = 25 m F Tant., (V IN – V OUT ) = 3V,
I OUT = 4A, T J < 25 ° C
LT1585-3.3
f = 120Hz, C OUT = 25 m F Tant., V IN = 6.3V,
I OUT = 4.6A, T J ³ 25 ° C
f = 120Hz, C OUT = 25 m F Tant., V IN = 6.3V,
I OUT = 4A, T J < 25 ° C
LT1585-3.38
f = 120Hz, C OUT = 25 m F Tant., V IN = 6.38V, I OUT = 4A
LT1585-3.45
f = 120Hz, C OUT = 25 m F Tant., V IN = 6.45V, I OUT = 4A
LT1585-3.6
f = 120Hz, C OUT = 25 m F Tant., V IN = 6.6V, I OUT = 4A
LT1587
f = 120Hz, C OUT = 25 m F Tant., (V IN – V OUT ) = 3V, I OUT = 3A
LT1587-3.3
f = 120Hz, C OUT = 25 m F Tant., V IN = 6.3V, I OUT = 3A
LT1587-3.45
f = 120Hz, C OUT = 25 m F Tant., V IN = 6.45V, I OUT = 3A
LT1587-3.6
f = 120Hz, C OUT = 25 m F Tant., V IN = 6.6V, I OUT = 3A
l
60
72
dB
Thermal Regulation
LT1584/5/7
T A = 25
°
C, 30ms pulse
C, 30ms pulse
LT1584/5-3.38 T A = 25 ° C, 30ms pulse
LT1584/5/7-3.45 T A = 25
°
°
C, 30ms pulse
LT1584/5/7-3.6 T A = 25
°
C, 30ms pulse
0.004
0.02
%/W
Temperature Stability
l
0.5
%
Long-Term Stability
T A = 125 ° C, 1000 Hrs.
0.03
1.0
%
RMS Output Noise
T A = 25 ° C, 10Hz £ f £ 10kHz
0.003
%
(% of V OUT )
Thermal Resistance
LT1584
T Package: Control Circuitry/Power Transistor
0.65/2.7
° C/W
Junction to Case
LT1585
T Package: Control Circuitry/Power Transistor
0.7/3.0
°
C/W
LT1585
M Package: Control Circuitry/Power Transistor
0.7/3.0
° C/W
LT1587
T Package: Control Circuitry/Power Transistor
0.7/3.0
° C/W
LT1587
M Package: Control Circuitry/Power Transistor
0.7/3.0
°
C/W
The l 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 (25W for the LT1584 in T package, 26.5W for the LT1585 in T
package, 18W for the LT1587 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.
C for the LT1585/LT1585-3.3
and 3A for the LT1587. The remaining LT1585 fixed voltage versions are
4A. The LT1585 and LT1587 have constant current limit with changes in
input-to-output voltage. The LT1584 has variable current limit which
decreases about 4A as input-to-output voltage increases from 3V to 7V.
25
°
C and 4A at T J < 25
°
4
A
£
LT1584/5/7-3.3 T A = 25
Note 3: I FULL LOAD is defined as the maximum value of output load current
as a function of input-to-output voltage. I FULL LOAD is equal to 7A for the
LT1584, 4.6A at T J
³
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LT1584/LT1585/LT1587
TYPICAL PERFOR M A N CE CHARACTERISTICS
LT1584 Dropout Voltage
vs Output Current
LT1584 Short-Circuit Current
vs Input/Output Differential
LT1584 Load Regulation
vs Temperature
1.5
10
0.10
D I = 7A
1.4
GUARANTEED
TEST POINTS
0.05
1.3
8
1.2
T = –5 ° C
0
1.1
6
T = 125
°
C
1.0
T = 125 ° C
T = 25
°
C
–0.05
T = –5
°
C
T = 25
°
C
0.9
4
0.8
MINIMUM
–0.10
0.7
2
–0.15
0.6
0.5
0
–0.20
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
–75
–50
–25
0
25
50
75
100
125
150
175
OUTPUT CURRENT (A)
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE ( ° C)
LTC1584 • TPC01
LT1584 • TPC02
LT1584 • TPC03
LT1585 Dropout Voltage
vs Output Current
LT1585 Short-Circuit Current
vs Temperature
LT1585 Load Regulation
vs Temperature
1.5
6.0
0.10
GUARANTEED
TEST POINTS
D I = 4.6A
1.4
0.05
1.3
T = –5 ° C
5.5
1.2
0
1.1
1.0
T = 125
°
C
5.0
–0.05
T = 25 ° C
0.9
–0.10
0.8
4.5
0.7
–0.15
0.6
0.5
4.0
–0.20
0
1
2
3
4
5
–75
–50
–25
0
25 50
75
100
125
150
175
–75
–50
–25
0
25
50
75
100
125
150
175
OUTPUT CURRENT (A)
TEMPERATURE (
°
C)
TEMPERATURE ( ° C)
LT1585 • TPC04
LT1584 • TPC05
LT1584 • TPC03
LT1587 Dropout Voltage
vs Output Current
LT1587 Short-Circuit Current
vs Temperature
LT1587 Load Regulation
vs Temperature
1.5
5.0
0.10
GUARANTEED
TEST POINTS
D
I = 3A
1.4
0.05
1.3
4.5
1.2
T = –5 ° C
0
1.1
1.0
T = 25
°
4.0
–0.05
0.9
T = 125 ° C
–0.10
0.8
3.5
0.7
–0.15
0.6
0.5
3.0
–0.20
0
0.5
1.0
1.5
2.0
2.5
3.0
–75
–50
–25
0
25 50
75
100
125
150
175
–75
–50
–25
0
25
50
75
100
125
150
175
OUTPUT CURRENT (A)
TEMPERATURE ( ° C)
TEMPERATURE (
C)
LT1584 • TPC07
LT1584 • TPC05
LT1584 • TPC09
5
C
°
23708098.024.png 23708098.025.png 23708098.026.png 23708098.027.png 23708098.028.png 23708098.029.png 23708098.030.png 23708098.031.png 23708098.032.png 23708098.033.png 23708098.034.png 23708098.035.png 23708098.036.png 23708098.037.png 23708098.038.png 23708098.039.png 23708098.040.png 23708098.041.png 23708098.042.png 23708098.043.png 23708098.044.png 23708098.045.png
 

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