Dual Input Low Dropout Regulator
POWER MANAGEMENT
Description
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.
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.
EZ1580/EZ1581
EZ1582/EZ1583
Features
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
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)
3.3V POWER IN
5V CONTROL IN
5
4
U1
1
SNS
EZ158XCX
VREF
3
PWR
CTL
ADJ
OUT
2.5V OUT
R1
124
C3
68uF
C1
33uF
C2
10uF
2
R2
V
OUT
=
V
REF
1
+
+
I
ADJ
•
R 2
R1
R2
124
GROUND
GROUND
Fixed Output Parts
U1
1
SNS
3.3V POWER IN
5V CONTROL IN
5
4
PWR
CTL
GND
C1
33uF
GROUND
C2
10uF
2
C3
68uF
GROUND
3
2.5V OUT
EZ158XCX-2.5
OUT
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.
Revision: October 29, 2003
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EZ1580/EZ1581
EZ1582/EZ1583
POWER MANAGEMENT
Absolute Maximum Ratings
Parameter
Power Input Voltage
Control Input Voltage
Power Dissipation
Thermal Resistance Junction to Ambient
EZ158X TO-220
EZ158X TO-263
Thermal Resistance Junction to Case
EZ1580/1 (TO-220 & TO-263)
EZ1582/3 (TO-220 & TO-263)
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 Sec.
ESD Rating (Human Body Model)
Symbol
V
PWR
V
CTL
P
D
θ
J A
Maximum
7
13.2
Internally Limited
50
60
2
3
0 to +125
-65 to +150
300
2
Units
V
V
W
°C/W
θ
J C
T
J
T
STG
T
LEAD
ESD
°C/W
°C
°C
°C
kV
Electrical Characteristics
(7)
Unless specified: V
OUT
= V
SNS
, V
ADJ
= 0V, C
CTL
= C
PWR
= C
OUT
= 10µF. Values in
bold
apply over full operating temperature range.
Parameter
Reference Voltage
(1)
(Adj. Voltage Versions)
Symbol
V
REF
Test Conditions
V
PWR
= 2.05V, V
CTL
= 4.5V, I
OUT
= 10mA
V
CTL
V
PWR
= 2.05V,
= 4.5V, 10mA < I
OUT
< I
RATED
Min
1.237
1.231
-1
-1.5
Typ
1.250
Max
1.263
1.269
Units
V
Output Voltage
(1)
(2.5V Version)
V
OUT
V
PWR
= 3.3V, V
CTL
= 4.5V, I
OUT
= 10mA
V
CTL
V
PWR
= 3.3V,
= 4.5V, 10mA < I
OUT
< I
RATED
V
OUT
+1
+1.5
%
Line Regulation
(1)
Load Regulation
(1)
V
PWR
Dropout Voltage
EZ1581, EZ1582,
EZ1583
V
PWR
Dropout Voltage
EZ1580
(1)(2)
(1)(2)
REG
(LINE)
REG
(LOAD)
V
PWR
= (V
OUT
+ 0.8V) to 5.5V,
V
CTL
= 4.5V to 12V, I
OUT
= 10mA
V
CTL
V
PWR
= V
OUT
+ 0.8V,
= 4.5V, I
OUT
= 10mA to I
RATED
1.0
1.0
3.0
5.0
mV
mV
V
PWR
- V
OUT
V
CTL
= 4.75V, I
O
= I
RATED
0.40
0.50
0.50
0.60
V
V
CTL
= 4.75V, I
O
= I
RATED
0.54
0.70
0.62
0.80
V
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EZ1580/EZ1581
EZ1582/EZ1583
POWER MANAGEMENT
Electrical Characteristics (Cont.)
(7)
Unless specified: V
OUT
= V
SNS
, V
ADJ
= 0V, C
CTL
= C
PWR
= C
OUT
= 10µF. Values in
bold
apply over full operating temperature range.
Parameter
Control Pin Current
(3)
EZ1583
EZ1582
EZ1581
EZ1580
Adjust Pin Current
Minimum Load Current
(4)
Current Limit
EZ1583
EZ1582
EZ1581
EZ1580
Ripple Rejection Ratio
(5)
Thermal Regulation
(6)
Symbol
Test Conditions
Min
Typ
Max
Units
I
CTL
V
PWR
= V
OUT
+ 0.8V, V
CTL
= 4.5V, I
OUT
= I
RATED
6
30
33
60
120
120
120
120
120
10
mA
I
ADJ
I
OUT(MIN)
V
PWR
= 2.05V, V
CTL
= 4.5V, I
OUT
= 10mA
V
PWR
= V
OUT
+ 0.8V, V
CTL
= 5V
50
5
µA
mA
I
CL
V
PWR
= V
OUT
+ 0.8V, V
CTL
= 4.5V,
∆V
OUT
= 100mV
1.6
3.1
5.1
7.1
A
R
A
REG
(THERMAL)
V
PWR
= V
CTL
= 5V, I
O
= I
RATED
60
80
0.002
0.02
dB
%/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) V
RIPPLE
= 1V
PK-PK
, 120Hz.
(6) 30ms.
(7) I
RATED
= 1.5A for EZ1583, 3A for EZ1582, 5A for EZ1581 and 7A for EZ1580.
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EZ1580/EZ1581
EZ1582/EZ1583
POWER MANAGEMENT
Pin Configurations
Pin
1
2
3
4
5
Function
SNS
AD J
OUT
CTL
PWR
Ordering Information
Device
(1)
EZ1580CT-X.X
EZ1581CT-X.X
EZ1582CT-X.X
EZ1583CT-X.X
EZ1580CM-X.X.TR
EZ1581CM-X.X.TR
EZ1582CM-X.X.TR
EZ1583CM-X.X.TR
TO-263, 5-pin
(3)
P ackag e
TO-220, 5-pin
(2)
I
OUT
(A)
7
5
3
2.5
7
5
3
2.5
-
Tab is OUT
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) Lead free product. Where x = 0; 1; 2 or 3.
X.X denotes voltage options.
Pin Descriptions
Pin #
1
2
3
4
Symbol
SNS
AD J
OUT
CTL
Pin Name
SENSE
ADJUST
OUTPUT
CONTROL
Pin Function
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.
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.
This is the power output of the device. This pin is electrically connected to the tab.
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.
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.
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PWR
POWER
2003 Semtech Corp.
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.
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
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-220-5
Outline Drawing - TO-263-5
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