Rainbow Electronics MAX1717 - Manual (Page 9)

MAX1717
Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
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B
C
100 µs/div
STARTUP WAVEFORM
A
MAX1717 toc28
A = V OUT , 1V/div
B = INDUCTOR CURRENT, 10A/div
C = SKP/SDN, 5V/div
300kHz VOLTAGE POSITIONED,
CIRCUIT 2, PWM MODE,
NO LOAD
B
C
100 µs/div
STARTUP WAVEFORM
A
MAX1717 toc29
A = V OUT , 1V/div
B = INDUCTOR CURRENT, 10A/div
C = SKP/SDN, 5V/div
300kHz VOLTAGE POSITIONED,
CIRCUIT 2, I
OUT
=12A
B
C
D
50 µs/div
DYNAMIC OUTPUT VOLTAGE TRANSITION
A
MAX1717 toc30
300kHz STANDARD APPLICATION, CIRCUIT 1,
PWM MODE, V
OUT = 1.35V TO 1.6V, I OUT = 0.3A,
R
TIME
= 120k Ω
A = V OUT , 200mV/div, AC-COUPLED
B = INDUCTOR CURRENT, 10A/div
C = VGATE, 5V/div
D = A/B, 5V/div
B
C
D
50 µs/div
DYNAMIC OUTPUT VOLTAGE TRANSITION
A
MAX1717 toc31
300kHz STANDARD APPLICATION, CIRCUIT 1,
PWM MODE, V
OUT = 1.35V TO 1.6V,
I OUT = 12A, R TIME = 120k Ω
A = V OUT , 200mV/div, AC-COUPLED
B = INDUCTOR CURRENT, 10A/div
C = VGATE, 5V/div
D = A/B, 5V/div
B
C
D
20 µs/div
DYNAMIC OUTPUT VOLTAGE TRANSITION
A
MAX1717 toc32
A = V
OUT
, 200mV/div, AC-COUPLED
B = INDUCTOR CURRENT, 10A/div
C = VGATE, 5V/div
D = A/B, 5V/div
1000kHz +5V, CIRCUIT 4,
PWM MODE, V
OUT = 1.35V TO 1.6V,
I OUT = 0.3A, R TIME = 51k Ω
B
40 µs/div
OUTPUT OVERLOAD WAVEFORM
A
MAX1717 toc33
A = V OUT , 500mV/div
B = INDUCTOR CURRENT, 10A/div
300kHz VOLTAGE POSITIONED, CIRCUIT 2,
PWM MODE
Typical Operating Characteristics (continued)
(Circuit of Figure 1, components of Table 1, V+ = +12V, V DD = V CC = SKP/SDN = +5V, V OUT = 1.6V, T A = +25°C, unless otherwise noted.)