Rainbow Electronics MAX1855 - Manual (Page 11)

MAX1716/MAX1854/MAX1855
High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
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5V
20 µs/div
0
0
0
1V
2V
20A
10A
A
B
C
A. V OUT = 1.6V, 1V/div
B. I L , L = 0.68 µH, 10A/div
C. SHORT-CIRCUIT CONTROL, 5V/div
SHORT-CIRCUIT WAVEFORM
MAX1716-30
B
C
5V
200 µs/div
0
0
0
1V
2V
20A
10A
A
A. V OUT = 1.6V, 1V/div
B. I L , L = 0.68 µH, 10A/div
C. V SHDN = 0 TO V CC , 5V/div
R OUT = 88m Ω
STARTUP WAVEFORM
(18A LOAD)
MAX1716-31
0
0
100 µs/div
5V
5V
20A
0
2V
0
-20A
A
B
C
D
A. V OUT = 1.6V, R OUT = 88m Ω, 2V/div
B. I L , L = 0.68 µH, 20A/div
C. V DL , 5V/div
D. V SHDN = V CC TO 0, 5V/div
SHUTDOWN WAVEFORM
MAX1716-32
0
0
100 µs/div
5V
5V
0
1V
2V
10A
0
A
B
C
D
A. V OUT = 1.6V, NO LOAD, 1V/div
B. I L , L = 0.68 µH, 10A/div
C. V DL , 5V/div
D. V SHDN = 0 TO V CC , 5V/div
STARTUP WAVEFORM
(NO-LOAD)
MAX1716-33
Typical Operating Characteristics (continued)
(Circuit from Figure 1, components from Table 2, T A = +25°C, unless otherwise noted.)