Rainbow Electronics MAX1718 - Manual (Page 8)

MAX1718
Notebook CPU Step-Down Controller for Intel
Mobile Voltage Positioning (IMVP-II)
8 _______________________________________________________________________________________
100 µs/div
SHUTDOWN WAVEFORM
(PWM MODE, NO LOAD)
A
MAX1718 toc13
B 0A
A = V OUT , 1V/div
B = INDUCTOR CURRENT, 10A/div
C = SKP/SDN, 5V/div
C
100 µs/div
SHUTDOWN WAVEFORM
(PWM MODE, I OUT = 12A)
A
MAX1718 toc14
B 0A
A = V
OUT
, 1V/div
B = INDUCTOR CURRENT, 10A/div
C = SKP/SDN, 5V/div
C
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.)
40 µs/div
DYNAMIC OUTPUT VOLTAGE TRANSITION
(PWM MODE)
A
MAX1718 toc12
B 0A
A = V OUT , 500mV/div, AC-COUPLED
B = INDUCTOR CURRENT, 10A/div
C = VGATE, 5V/div
D = SUS, 5V/div
C
D
V OUT = 0.7V TO 1.25V
I OUT = 3A, R TIME = 62k Ω
0.750
0.800
0.775
0.850
0.825
0.900
0.875
0.925
0.5 0.9 1.1 0.7 1.3 1.5 1.7 1.9
OFFSET FUNCTION SCALE FACTOR
vs. DAC SETTING
MAX1718 toc15
DAC SETTING (V)
POS-NEG SCALE FACTOR
MEASURED
THEORETICAL
1.00
1.10
1.05
1.25
1.20
1.15
1.40
1.35
1.30
1.45
-300 -100 -200 0 100 200
OUTPUT VOLTAGE
vs. POS-NEG DIFFERENTIAL
MAX1718 toc16
POS-NEG (mV)
OUTPUT VOLTAGE (V)