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