Rainbow Electronics MAX1718 - Manual (Page 7)

MAX1718
Notebook CPU Step-Down Controller for Intel
Mobile Voltage Positioning (IMVP-II)
_______________________________________________________________________________________ 7
0
5
10
15
20
25
30
35
40
5 10 15 20 25
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1718 toc07
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
I CC + I DD
I+
40 µs/div
LOAD-TRANSIENT RESPONSE
(PWM MODE)
A
MAX1718 toc08b
B 0A
A = V OUT , 50mV/div, AC-COUPLED
B = INDUCTOR CURRENT, 10A/div
40 µs/div
LOAD-TRANSIENT RESPONSE
(SKIP MODE)
A
B
MAX1718 toc08a
0A
A = V OUT , 50mV/div, AC-COUPLED
B = INDUCTOR CURRENT, 10A/div
100 µs/div
STARTUP WAVEFORM
(PWM MODE, NO LOAD)
A
MAX1718 toc09
B 0A
A = V OUT , 1V/div
B = INDUCTOR CURRENT, 10A/div
C = SKP/SDN, 5V/div
C
100 µs/div
STARTUP WAVEFORM
(PWM MODE, I OUT = 12A)
A
MAX1718 toc10
B OA
A = V OUT , 1V/div
B = INDUCTOR CURRENT, 10A/div
C = SKP/SDN, 5V/div
C
40 µs/div
DYNAMIC OUTPUT VOLTAGE TRANSITION
(PWM MODE)
A
MAX1718 toc11
B OA
A = V
OUT
, 100mV/div, AC-COUPLED
B = INDUCTOR CURRENT, 10A/div
C = VGATE, 5V/div
D = ZMODE, 5V/div
C
D
V OUT = 1.15V TO 1.25V
I OUT = 3A, R TIME = 62k Ω
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V+ = 12V, V
DD
= V
CC
= SKP/SDN = 5V, V
OUT
= 1.25V, T
A
= +25°C, unless otherwise noted.)