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.
u 540mV dropout @ 7A in dual supply mode
(EZ1580)
u Remote sense operation
u Fast transient response
u 0.5% initial accuracy
u Line regulation typically 0.08%
u Load regulation typically 0.08%
u 5 Pin TO-220 and TO-263 packages
Applications
u Microprocessor supplies
u Split plane microprocessor supplies
u Advanced graphics cards
u Sound cards
u Low voltage logic supplies
u Switching power supply post regulation
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 voltage regula-
tor available in the popular 5 pin TO-220 and TO-263
plastic packages.
Typical Application Circuits
Adjustable Output Parts(3)
U1
EZ158XCX
OUT
1
VREF
SNS
5
4
3.3V POWER IN
5V CONTROL IN
PWR
CTL
3
2.5V OUT
R2
ADJ
R1
124
VOUT = VREF 1+
+ IADJ • R2
C1
33uF
C2
10uF
C3
68uF
R1
2
R2
124
GROUND
GROUND
Fixed Output Parts
U1
EZ158XCX-2.5
U1
EZ158XCX-1.5
1
1
SNS
SNS
5
5
4
3.3V POWER IN
5V CONTROL IN
2.5V POWER IN
PWR
PWR
CTL
3
3
2.5V OUT
1.5V OUT
OUT
OUT
4
3.3V CONTROL IN
CTL
GND
2
GND
2
C1
33uF
C2
10uF
C3
68uF
C1
47uF
C2
10uF
C3
100uF
GROUND
GROUND
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.
Revision 1, January 2001
1
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