Datasheet

MAX8855/MAX8855A
Dual, 5A, 2MHz Step-Down Regulators
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
IN1
= V
IN2
= 3.3V, MAX8855/MAX8855A, circuit of Figure 6, T
A
= +25°C, unless otherwise noted.)
OUTPUT TRACKING (EN1 = EN2)
MAX8855/MAX8855A toc13
1ms/div
DDR TRACKING 1.8V, 0.9V
V
OUT1
V
OUT2
V
PWRGD1
V
PWRGD2
1V/div
1V/div
2V/div
2V/div
EXTERNAL SYNCHRONIZATION
MAX8855/MAX8855A toc14
400ns/div
V
LX1
V
LX2
2V/div
2V/div
2V/div
PULSE GENERATOR SIGNAL. A 10kΩ RESISTOR
IS CONNECTED BETWEEN THE PULSE
GENERATOR AND FSYNC
STARTING INTO PREBIASED OUTPUT
MAX8855/MAX8855A toc15
40
μ
s/div
V
OUT1
V
EN1
V
PWRGD1
OUTPUT PEAK CURRENT LIMIT
vs. OUTPUT VOLTAGE
MAX8855/MAX8855A toc10
OUTPUT VOLTAGE (V)
OUTPUT PEAK CURRENT LIMIT (A)
1.7 2.0
1
2
3
4
5
6
7
8
0
0.8 1.1 1.4 2.3
2.6
SHORT CIRCUIT AND RECOVERY
MAX8855/MAX8855A toc11
1ms/div
I
L1
V
OUT1
500mV/div
2A/div
0A
OUTPUT SEQUENCING (EN2 = PWRGD1)
MAX8855/MAX8855A toc12
1ms/div
V
OUT1
V
OUT2
V
PWRGD1
V
PWRGD2
1V/div
1V/div
2V/div
2V/div