Low-Input-Voltage, 500mA LDO Regulator
with
RESET
in SOT and TDFN
MAX1589A
Typical Operating Characteristics (continued)
(V
IN
= (V
OUT
+ 0.5V) or 1.8V, whichever is greater;
SHDN
= IN, C
IN
= 1µF, C
OUT
= 4.7µF, T
A
= +25°C, unless otherwise noted.)
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX1589A toc07
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
V
OUT
= +1.5V
V
OUT
= +0.75V
V
OUT
= +3.0V
PSRR (dB)
70
60
MAX1589A toc08
200
80
160
V
DROPOUT
(mV)
120
V
OUT
= +1.8V
V
OUT
= +3.0V
50
40
30
20
10
I
OUT
= 10mA
0.1
1
10
FREQUENCY (kHz)
100
1000
80
40
0
0
100
200
300
400
500
LOAD CURRENT (mA)
0
LINE-TRANSIENT RESPONSE
MAX1589A toc09
LINE-TRANSIENT RESPONSE
NEAR DROPOUT
MAX1589A toc10
4V
V
IN
3.5V
500mV/div
2.5V
V
IN
1.8V
500mV/div
V
OUT
I
LOAD
= 100mA
V
OUT
= 1.5V
40µs/div
1.5V
10mV/div
AC-COUPLED
V
OUT
I
LOAD
= 100mA
V
OUT
= 1.5V
40µs/div
1.5V
10mV/div
AC-COUPLED
LOAD-TRANSIENT RESPONSE
MAX1589A toc11
LOAD-TRANSIENT RESPONSE
MAX1589A toc12
200mA
I
OUT
20mA
200mA/div
500mA
I
OUT
100mA
500mA/div
V
OUT
0
20mV/div
AC-COUPLED
V
OUT
50mV/div
AC-COUPLED
V
IN
= 1.8V
V
OUT
= 1.5V
20µs/div
V
IN
= 3.6V
V
OUT
= 1.5V
20µs/div
4
_______________________________________________________________________________________
ROCHESTER [ Rochester Electronics ]
