Datasheet

MAX8655
Highly Integrated, 25A, Wide-Input,
Internal MOSFET, Step-Down Regulator
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
V
SYNCO
V
FSYNC
V
LX
5V/div
5V/div
5V/div
1
µ
s/div
FSYNC AND SYNCO
(CIRCUIT OF FIGURE 4)
MAX8655 toc09
INTERNAL 350kHz
OPERATION
SYNCHRONIZED TO
EXTERNAL 500kHz CLOCK
V
SYNCO
(MASTER)
V
LX
(SLAVE)
V
LX
(MASTER)
5V/div
5V/div
5V/div
1
µ
s/div
DUAL-PHASE SWITCHING
(CIRCUIT OF FIGURE 5)
MAX8655 toc10
I
IN
V
IN
V
OUT
500mV/div
(AC-COUPLED)
1V/div
1A/div
1ms/div
SHORT CIRCUIT AND RECOVERY
MAX8655 toc11
V
OUT
V
LX
2V/div
5V/div
40µs/div
OVERVOLTAGE PROTECTION
(CIRCUIT OF FIGURE 3)
MAX8655 toc12
CLOSED-LOOP BODE PLOT
(CIRCUIT OF FIGURE 3)
MAX8655toc13
50
500 1k 2k 4k 10k 20k
FREQUENCY (Hz)
GAIN (dB)
PHASE MARGIN (DEGREES)
40k 100k 200k400k
40
30
20
10
0
180
144
108
72
36
0
-10
-20
-30
-40
GAIN
PHASE
SAFE OPERATING AREA
INPUT VOLTAGE (V)
OUTPUT CURRENT (A)
MAX8655 toc14
5 1015202530
0
5
10
15
20
25
30