Semtech EZ1581 Dual input low dropout regulator Datasheet

EZ1580/EZ1581
EZ1582/EZ1583
Dual Input Low Dropout Regulator
POWER MANAGEMENT
Description
Features
The EZ158X family of high performance positive voltage
regulators are designed for use in applications requiring
very low dropout voltage at up to 7, 5, 3 and 1.5 amps.
Capable of supplying up to 2.8V on boards where both
5V and 3.3V supplies are available, the superior dropout
characteristics of the EZ158X result in reduced heat
dissipation compared to regular LDOs. This allows for
heatsink size reduction or elimination. Additionally, the
EZ158X provides excellent regulation over variations in
line, load and temperature. Remote sense operation
allows compensating for trace, connector and other
resistive losses.
‹ 540mV dropout @ 7A in dual supply mode
‹
‹
‹
‹
‹
‹
(EZ1580)
Remote sense operation
Fast transient response
0.5% initial accuracy
Line regulation typically 0.08%
Load regulation typically 0.08%
5 Pin TO-220 and TO-263 packages
Applications
‹
‹
‹
‹
‹
‹
Outstanding features include very low dropout
performance at rated current, fast transient response,
remote sense, internal current limiting, thermal shutdown
and safe operating area protection of the output device.
The EZ158X is a five terminal adjustable or fixed 2.5V
voltage regulator available in the popular 5 pin TO-220
and TO-263 plastic packages.
Microprocessor supplies
Split plane microprocessor supplies
Advanced graphics cards
Sound cards
Low voltage logic supplies
Switching power supply post regulation
Typical Application Circuits
Adjustable Output Parts(3)
U1
3.3V POWER IN
5
5V CONTROL IN
4
1
SNS
EZ158XCX
VREF
PWR
OUT
3
2.5V OUT
CTL
ADJ
C1
33uF
C2
10uF
R1
124
C3
68uF
2
R2 

VOUT = VREF  1 +
 + I ADJ • R 2
R1 

R2
124
GROUND
GROUND
Fixed Output Parts
U1
1
EZ158XCX-2.5
SNS
3.3V POWER IN
5
5V CONTROL IN
4
PWR
OUT
3
2.5V OUT
CTL
GND
C1
33uF
C2
10uF
C3
68uF
2
GROUND
GROUND
Notes:
(1) Capacitor values are for reference only. Good quality, low ESR tantalum or aluminum electrolytic capacitors
should be used. Increasing the value of the output capacitor will improve the overall transient response.
(2) If the same voltage is input to both PWR and CTL, then the dropout voltage will become 1.3V maximum.
(3) A small (~0.033µF) capacitor can be used to bypass the ADJ pin to improve transient response, if needed.
June 23, 2010
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EZ1580/EZ1581
EZ1582/EZ1583
POWER MANAGEMENT
Absolute Maximum Ratings
Parameter
Symbol
Maximum
Units
Power Input Voltage
VPWR
7
V
Control Input Voltage
VCTL
13.2
V
Power Dissipation
PD
Internally Limited
W
Thermal Resistance Junction to Ambient
EZ158X TO-220
EZ158X TO-263
θJ A
50
60
°C/W
Thermal Resistance Junction to Case
EZ1580/1 (TO-220 & TO-263)
EZ1582/3 (TO-220 & TO-263)
θJ C
2
3
°C/W
Operating Junction Temperature Range
TJ
0 to +125
°C
Storage Temperature Range
TSTG
-65 to +150
°C
Lead Temperature (Soldering) 10 Sec.
TLEAD
300
°C
ESD Rating (Human Body Model)
ESD
2
kV
Electrical Characteristics(7)
Unless specified: VOUT = VSNS, VADJ = 0V, CCTL = CPWR = COUT = 10µF. Values in bold apply over full operating temperature range.
Parameter
Reference Voltage(1)
Symbol
Test Conditions
Min
Typ
Max
Units
VREF
VPWR = 2.05V, VCTL = 4.5V, IOUT = 10mA
1.237
1.250
1.263
V
VPWR = 2.05V,
VCTL = 4.5V, 10mA < IOUT < IRATED
1.231
VPWR = 3.3V, VCTL = 4.5V, IOUT = 10mA
-1
VPWR = 3.3V,
VCTL = 4.5V, 10mA < IOUT < IRATED
-1.5
(Adj. Voltage Versions)
Output Voltage(1)
VOUT
(2.5V Version)
1.269
VOUT
+1
%
+1.5
Line Regulation(1)
REG(LINE)
VPWR = (VOUT + 0.8V) to 5.5V,
VCTL = 4.5V to 12V, IOUT = 10mA
1.0
3.0
mV
Load Regulation(1)
REG(LOAD)
VPWR = VOUT + 0.8V,
VCTL = 4.5V, IOUT = 10mA to IRATED
1.0
5.0
mV
VPWR - VOUT
VCTL = 4.75V, I O = IRATED
0.40
0.50
V
0.50
0.60
0.54
0.62
0.70
0.80
VPWR Dropout Voltage
(1)(2)
EZ1581, EZ1582,
EZ1583
VPWR Dropout Voltage
EZ1580
 2005 Semtech Corp.
(1)(2)
VCTL = 4.75V, I O = IRATED
2
V
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EZ1580/EZ1581
EZ1582/EZ1583
POWER MANAGEMENT
Electrical Characteristics (Cont.)(7)
Unless specified: VOUT = VSNS, VADJ = 0V, CCTL = CPWR = COUT = 10µF. Values in bold apply over full operating temperature range.
Parameter
Symbol
Test Conditions
ICTL
VPWR = VOUT + 0.8V, VCTL = 4.5V, IOUT = IRATED
Min
Typ
Max
Units
6
120
mA
EZ1582
30
120
EZ1581
33
120
EZ1580
60
120
Control Pin Current (3)
EZ1583
Adjust Pin Current
Minimum Load Current(4)
IADJ
VPWR = 2.05V, VCTL = 4.5V, IOUT = 10mA
50
120
µA
IOUT(MIN)
VPWR = VOUT + 0.8V, VCTL = 5V
5
10
mA
ICL
VPWR = VOUT + 0.8V, VCTL = 4.5V,
1.6
∆VOUT = 100mV
3.1
Current Limit
EZ1583
EZ1582
EZ1581
5.1
EZ1580
7.1
Ripple Rejection Ratio(5)
Thermal Regulation (6)
RA
VPWR = VCTL = 5V, I O = IRATED
REG (THERMAL)
60
A
80
0.002
dB
0.02
%/W
NOTES:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2) Minimum input to output voltage differential required to maintain 1% regulation.
(3) Current used to drive the output section.
(4) Required to maintain regulation. Resistor divider R1, R2 is usually utilized for minimum load current.
(5) VRIPPLE = 1VPK-PK, 120Hz.
(6) 30ms.
(7) IRATED = 1.5A for EZ1583, 3A for EZ1582, 5A for EZ1581 and 7A for EZ1580.
 2005 Semtech Corp.
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EZ1580/EZ1581
EZ1582/EZ1583
POWER MANAGEMENT
Pin Configurations
Ordering Information
Device(1)
P ackag e
IOUT (A)
Pin
Function
EZ1580CT-X.X
1
SNS
EZ1581CT-X.X
2
AD J
EZ1582CT-X.X
3
3
OUT
EZ1583CT-X.X
2.5
4
CTL
EZ1580CM-X.X.TR
7
5
PWR
EZ1581CM-X.X.TR
5
Tab is OUT
EZ1582CM-X.X.TR
EZ1583CM-X.X.TR
7
TO-220, 5-pin(2)
TO-263, 5-pin (3)
5
3
2.5
EZ1583CMTRT(4)
Block Diagram
EZ158xCM-X.XTRT(4)
-
Notes:
(1) Where -X.X denotes voltage options. Available
voltage is: 2.5V. Leave blank for adjustable version (1.3
to 5.7V).
(2) Only available in tube packaging. A tube contains 50
devices.
(3) Only available in tape and reel packaging. A reel
contains 800 devices.
(4) This product is fully WEEE and RoHS compliant. Where
x = 0; 1; 2 or 3. X.X denotes voltage options.
Pin Descriptions
Pin #
Symbol
Pin Name
Pin Function
1
SNS
SENSE
This pin is the positive side of the reference voltage for this device. With this pin it is
possible to Kelvin sense the output voltage at the load.
2
AD J
ADJUST
This pin is the negative side of the reference voltage for this device. Transient response
can be improved by adding a small bypass capacitor from the adjust pin to ground.
3
OUT
OUTPUT
This is the power output of the device. This pin is electrically connected to the tab.
4
CTL
CONTROL
This pin is the supply pin for the control circuitry for the device. The current flow into this
pin will be approximately 1% of the output current. For the device to regulate, the voltage
on this pin must be between 1.0V and 1.3V greater than the output voltage.
5
PWR
POWER
This is the collector input to the power device of the EZ1583. The ouput load current is
supplied through this pin. For the device to regulate, the voltage on this pin must be
between 0.1V and 0.8V greater than the output voltage, depending upon load current.
 2005 Semtech Corp.
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EZ1580/EZ1581
EZ1582/EZ1583
POWER MANAGEMENT
Applications Information
The EZ158X is a low dropout regulator designed to power
low voltage microcontrollers, graphics ICs, sound cards
etc.
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.
The dropout voltage is minimized by utilizing a separate
input voltage, VCTL, which should exceed VOUT 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
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-220-5
ØP
B A
aaa
DIM
A
A1
A2
b
c
D
D1
D2
E
E1
E2
e
H1
L
N
ØP
Q
aaa
bbb
ccc
B
A
SEATING
PLANE
E
E2
A
E/2
A1
Q
H1
D2
D
D1
C
L
DIMENSIONS
INCHES
MILLIMETERS
MIN NOM MAX MIN NOM MAX
.190 3.56
4.82
.055 0.51
1.40
.115 2.03
2.92
.031 .041 0.63 0.80 1.04
.024 0.36
0.61
.650 14.22
16.51
.355 8.38
9.02
.507 12.19
12.88
.420 9.65
10.66
.350 6.86
8.90
.030
0.76
.067 BSC
1.70 BSC
.230
.270 5.84
6.86
.580 12.70
14.73
.500
5
5
.139
.156 3.53
3.96
.100
.120 2.54
3.05
.014
0.36
.015
0.38
.010
0.25
.140
.020
.080
.025
.014
.560
.330
.480
.380
.270
-
c
e
bbb
E1
A2
ccc
5X b
B A
B A
NOTES:
1.
CONTROLLING DIMENSIONS ARE IN INCHES.
2. DIMENSIONS "D" AND "E" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
Outline Drawing - TO-263-5
A
E
E/2
DIM
0
A
A1
b
c
c1
D
D1
E
E1
H
e
L
L1
N
0
01
aaa
L1
D
H
1 2 3 4 5
e
bXN
aaa
B A
DIMENSIONS
INCHES
MILLIMETERS
MIN NOM MAX MIN NOM MAX
4.83
4.06
0.25
0.00
0.51
0.99
0.74
0.38
1.14
1.65
8.28
9.65
6.86
9.65
10.67
6.22
14.61
15.88
1.70 BSC
2.79
1.78
1.68
5
15
0
8
0.25
.190
.010
.039
.029
.065
.380
.420
.625
.067 BSC
.070
.110
.066
5
15
0
8
.010
.160
.000
.020
.015
.045
.326
.270
.380
.245
.575
A
SEATING
PLANE
A1
B
c1
SIDE VIEW
SEE DETAIL
PLATED COPPER
HEAT SPREADER
A
D1
(L1)
c
E1
L
DETAIL
NOTES:
1.
A
01
CONTROLLING DIMENSIONS ARE IN INCHES (ANGLES IN DEGREES).
2. DIMENSIONS "D" AND "E" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
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EZ1580/EZ1581
EZ1582/EZ1583
POWER MANAGEMENT
Minimum Land Pattern - TO-263-5
H
DIM
K
Z
DIMENSIONS
INCHES
MILLIMETERS
G
H
K
P
X
Y
Z
.125
.420
.360
.067
.042
.140
.625
3.18
10.67
9.14
1.70
1.07
3.56
15.88
G
Y
P
X
NOTES:
1. CONTROLLING DIMENSIONS ARE IN INCHES (ANGLES IN DEGREES).
2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
 2005 Semtech Corp.
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