EZ1580 Datasheet, PDF (4/5 Pages) Semtech Corporation – DUAL INPUT LOW DROPOUT REGULATOR

DUAL INPUT
LOW DROPOUT REGULATOR
February 26, 1999
TYPICAL APPLICATIONS⁽¹⁾⁽²⁾
Adjustable Output Parts⁽³⁾
3.3V POWER IN
5V CONTROL IN
C1
33uF
U1
EZ158XCX
1
SENSE
5 _POWER
OUTPUT ³
4
CONTROL
ADJ
C2
10uF
2
VREF
R1
124
2.5V OUT
C3
68uF
R2
124
GROUND
Fixed Output Parts
V_OUT
=
V_REF
çæ1 +
è
R2
R1
ö
+
I_ADJ
• R2
GROUND
3.3V POWER IN
5V CONTROL IN
GROUND
C1
33uF
U1
EZ158XCX-2.5
1
SENSE
5 _POWER
OUTPUT ³
4 _CONTROL
GND
C2
10uF
2
2.5V OUT
C3
68uF
GROUND
EZ1580/EZ1581
EZ1582/EZ1583
2.5V POWER IN
3.3V CONTROL IN
GROUND
C1
47uF
U1
EZ158XCX-1.5
1
SENSE
5 _POWER
OUTPUT ³
4 _CONTROL
GND
C2
10uF
2
1.5V OUT
C3
100uF
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 POWER and CONTROL, then the dropout voltage will become 1.3V maxi-
mum.
(3) A small (~0.033µF) capacitor can be used to bypass the ADJUST pin to improve transient response, if needed.
© 1999 SEMTECH CORP.
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