Datasheet

MAX8556/MAX8557
4A Ultra-Low-Input-Voltage
LDO Regulators
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
EN
= V
IN
= +1.8V, V
OUT
= +1.5V, I
OUT
= 4A, C
OUT
= 20µF, C
IN
= 20µF, and T
A
= +25°C, unless otherwise noted.)
GND CURRENT vs. TEMPERATURE
MAX8556 toc04
TEMPERATURE (
°
C)
GND CURRENT (µA)
603510-15
100
200
300
400
500
600
700
800
900
0
-40 85
I
LOAD
= 2A
I
LOAD
= 0A
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8556 toc05
LOAD CURRENT (A)
DROPOUT VOLTAGE (mV)
3.53.02.0 2.51.0 1.50.5
10
20
30
40
50
60
70
80
90
0
0 4.0
V
IN
= 1.5V
LINE-TRANSIENT RESPONSE
MAX8556 toc06
100
µ
s/div
1.8V
10mV/div
2.5V
V
IN
V
OUT
(AC-COUPLED)
4A LOAD-TRANSIENT RESPONSE
MAX8556 toc07
40µs/div
2A/div
50mV/div
V
OUT
(AC-COUPLED)
I
OUT
2A LOAD-TRANSIENT RESPONSE
MAX8556 toc08
40µs/div
1A/div
50mV/div
V
OUT
(AC-COUPLED)
I
OUT
ENABLE WAVEFORMS
MAX8556 toc09
100µs/div
1V/div
2V/div
V
EN
V
OUT
SHORT-CIRCUIT WAVEFORMS
MAX8556 toc10
200µs/div
1V/div
5A/div
2V/div
V
IN
3.6V
V
OUT
I
OUT