EZ1580_03 Datasheet, PDF (1/6 Pages) Semtech Corporation – 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.
Typical Application Circuits
EZ1580/EZ1581
EZ1582/EZ1583
Dual Input Low Dropout Regulator
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
Adjustable Output Parts⁽³⁾
3.3V POWER IN
5V CONTROL IN
C1
33uF
U1
5 _PWR
4 _CTL
C2
10uF
EZ158XCX
1
SNS
OUT ³
ADJ
2
VREF
R1
124
2.5V OUT
C3
68uF
R2
124
V_OUT
=
V_REF
1 +

R2
R1


+ I_ADJ
• R2
GROUND
GROUND
Fixed Output Parts
3.3V POWER IN
5V CONTROL IN
GROUND
C1
33uF
U1
5 _PWR
4 _CTL
C2
10uF
EZ158XCX-2.5
1
SNS
OUT ³
GND
2
2.5V OUT
C3
68uF
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: October 29, 2003
1
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