Datasheet

MAX8650
4.5V to 28V Input Current-Mode Step-Down
Controller with Adjustable Frequency
_______________________________________________________________________________________ 7
V
OUT
I
L
V
POK
V
IN
5A/div
0V
5V/div
5V/div
1V/div
2ms/div
POWER-UP WAVEFORMS
MAX8650 toc09
V
OUT
I
L
V
POK
V
IN
5A/div
0V
0V
0V
5V/div
5V/div
1V/div
200μs/div
POWER-DOWN WAVEFORMS
MAX8650 toc10
V
OUT
I
L
V
POK
V
EN
10A/div
0V
5V/div
5V/div
2V/div
2ms/div
ENABLE/SHUTDOWN WAVEFORMS
MAX8650 toc11
V
DH
V
FSYNC
V
SYNCO
5V/div
5V/div
10V/div
1μs/div
SYNCHRONIZATION WAVEFORMS
MAX8650 toc12
I
IN
V
OUT
I
L
2V/div
0V
0V
0V
10A/div
10A/div
200μs/div
SHORT CIRCUIT AND RECOVERY
MAX8650 toc13
V
DL
V
OUT
V
DH
1V/div
0V
0V
0V
10V/div
5V/div
40μs/div
OVERVOLTAGE PROTECTION
MAX8650 toc14
7.5A LOAD
PHASE
0dB
10dB/div
0°
30°/div
1k 1M100k10k
CLOSED-LOOP BODE PLOT WITH NO LOAD
GAIN
MAX8650 toc15
FREQUENCY (Hz)
PHASE
0dB
10dB/div
0°
30°/div
1k 1M100k10k
CLOSED-LOOP BODE PLOT WITH 15A LOAD
GAIN
MAX8650 toc16
FREQUENCY (Hz)
Typical Operating Characteristics (continued)
(Circuit of Figure 3, 500kHz switching, V
IN
= 17V, V
OUT
= 3.3V, T
A
= +25°C, unless otherwise noted.)