5 2005 Semtech Corp. www.semtech.com
POWER MANAGEMENT
EZ1580/EZ1581
EZ1582/EZ1583
The EZ158X is a low dropout regulator designed to power
low voltage microcontrollers, graphics ICs, sound cards
etc.
The dropout voltage is minimized by utilizing a separate
input voltage, V
CTL
, which should exceed V
OUT
by at least
1.3V. The 2.5V (for example) power for the load can be
derived from a 3.3V system supply. Since the efficiency
of a linear regulator is the ratio of the output to the input
voltage, heat dissipation is reduced by using a 3.3V input
(versus a 5V one), thereby lowering heatsink and cooling
Applications Information
fan costs. For lower current applications, the heatsink
might be eliminated altogether. For a load of 7A at 2.5V,
the regulator would dissipate 17.5W when converting from
5V, but only 5.6W from a 3.3V input.
Remote Kelvin sensing of the output voltage can be
achieved by connecting the sense pin to the output at
the load. Remote sensing will reduce errors associated
with resistive trace losses between regulator and
processor.
Outline Drawing - TO-263-5
Outline Drawing - TO-220-5
e
H1
L
A2
D1
D
PLANE
SEATING
D2
Ø P
DIMENSIONS
INCHES
NOM
E1
aaa
ccc
bbb
ØP
Q
N
H1
L
E2
e
DIM
b
D1
D2
E
c
D
A
A2
A1
MIN
MILLIMETERS
MAXMINMAX NOM
E
E/2
A1
A
Q
E2
c
E1
5X b
.140
.031 0.80
-
-
-
-
-
-
-
-
-
-
--
-
-
-
-
-
0.36.014
0.38.015
0.25.010
3.56
.067 BSC
5
.380
.355
.025
5
9.02
1.70 BSC
.420 9.65
.041 0.63
10.66
1.04
8.38.330
.100
-
.500
.014
-
.080
.020
-
-
-
.120 2.54
-
3.05
-
.580
.024
12.70
0.36
.190
.115
.055 0.51
2.03
0.61
14.73
-
1.40
4.82
2.92
-
-
DIMENSIONS "D" AND "E" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
CONTROLLING DIMENSIONS ARE IN INCHES.
NOTES:
1.
2.
14.22
.650.560
-
16.51
-
.480 12.8812.19.507
A
bbb B A
C
aaa B A
B
ccc B A
6.86.270 .350 8.90
.030 0.76
6.865.84.270.230
.139 .156 3.53
-
3.96
.067 BSC
DETAIL
5
A
.326
.020
-
5
A
1.70 BSC
.380 8.28
.039 0.51
9.65
0.99
-
-
.070
.015
-
.000
-
-
15
-
15
.110
.029
1.78
0.38
.190
.010 0.00
0.74
2.79
-
0.25
4.83
-
-
DIMENSIONS "D" AND "E" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
CONTROLLING DIMENSIONS ARE IN INCHES (ANGLES IN DEGREES).
NOTES:
1.
2.
SIDE VIEW
e
1.14.065.045
-
1.65
-
--
80 80
.245 6.22
123 54
A
aaa BA
PLANE
SEATING
B
.380 10.679.65.420
-- --
1.68.066
4.06.160
-
-
-
-
-
-
--
--
0.25.010
--
.270
--
6.86
--
PLATED COPPER
HEAT SPREADER
aaa
N
01
0
D1
H
L1
L
e
E1
E
c
D
c1
b
A1
A
DIM
MILLIMETERSINCHES
DIMENSIONS
MIN NOM MAX MIN MAXNOM
b X N
(L1)
E1
D1
A1
A
0
E
E/2
L1
D
01
L
SEE DETAIL
c1
c
H
.575
-
.625 14.61
-
15.88
