EZ1586
3A Dual Input Very
Low Dropout Regulator
PRELIMINARY
POWER MANAGEMENT
Description
Features
The EZ1586 high performance positive voltage
regulator is designed for use in applications requiring very
low dropout voltage at up to 3 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 EZ1586 result in reduced heat
dissipation compared to regular LDOs, thus enabling the
part to operate without a heatsink.
u 500mV dropout @ 3A in dual supply mode
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 TO-263-5 package
Applications
Additionally, the EZ1586 provides excellent regulation over
variations in line, load and temperature. Remote sense
operation allows compensating for trace, connector and
other resistive losses.
u Advanced graphics cards
u Sound cards
u Modems
u Microprocessor supplies
u Split plane microprocessor supplies
u Other 2.5V to 3.6V microprocessor supplies
u Low voltage logic supplies
u Battery-powered circuitry
u Post regulator for switching supplies
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 EZ1586 is available in the popular 5 lead TO-263
surface mount package.
Typical Application Circuit
U1 EZ1586CM
5
4
1
3.3V POWER IN
5V CONTROL IN
PWR
SNS
3
2.5V OUT
CTL
OUT
ADJ
2
R1
124 Ohms
C1
33uF
C2
10uF
C3
68uF
R2
124 Ohms
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.
Revision 1, December 2000
1
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