MAX1717 Maxim, MAX1717 Datasheet - Page 7

• Manufacturer Part Number: MAX1717
• Description: Dynamically Adjustable / Synchronous Step-Down Controller for Notebook CPUs
• Manufacturer: Maxim

(Circuit of Figure 1, components of Table 1, V+ = +12V, V
1200
1000
800
600
400
400
300
200
100
3.0
2.5
2.0
1.5
1.0
0.5
0
0
5
0
0
300kHz VOLTAGE POSITIONED, CIRCUIT 2
1000kHz VOLTAGE POSITIONED, CIRCUIT 5
300kHz VOLTAGE POSITIONED, CIRCUIT 2
CONTINUOUS-TO-DISCONTINUOUS
PWM MODE
FREQUENCY vs. INPUT VOLTAGE
FREQUENCY vs. LOAD CURRENT
INDUCTOR CURRENT POINT
5
SKIP MODE
10
3
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
LOAD CURRENT (A)
Step-Down Controller for Notebook CPUs
10
_______________________________________________________________________________________
15
6
15
Dynamically Adjustable, Synchronous
I
I
OUT
OUT
20
9
20
= 12A
= 0.3A
25
25
12
1250
1000
350
340
330
320
310
300
Typical Operating Characteristics (continued)
750
500
250
30
25
20
15
10
5
0
0
-40
0
5
300kHz VOLTAGE POSITIONED, CIRCUIT 2
1000kHz VOLTAGE POSITIONED, CIRCUIT 5
AT CURRENT-LIMIT POINT
300kHz VOLTAGE POSITIONED, CIRCUIT 2
DD
PWM MODE
FREQUENCY vs. TEMPERATURE
INDUCTOR CURRENT PEAKS AND
FREQUENCY vs. LOAD CURRENT
7
-20
VALLEYS vs. INPUT VOLTAGE
= V
9
SKIP MODE
3
CC
11
TEMPERATURE (°C)
0
INPUT VOLTAGE (V)
LOAD CURRENT (A)
I
I
= SKP/SDN = +5V, V
PEAK
VALLEY
13
20
15 17 19 21 23 25
6
40
9
60
80 85
OUT
12
= 1.6V, T
1000
400
350
300
250
200
800
600
400
200
30
25
20
15
10
5
0
0
-40
A
5
5
OUTPUT CURRENT AT CURRENT LIMIT
300kHz VOLTAGE POSITIONED, CIRCUIT 2
300kHz VOLTAGE POSITIONED, CIRCUIT 2
300kHz VOLTAGE POSITIONED, CIRCUIT 2,
SKIP MODE
= +25°C, unless otherwise noted.)
FREQUENCY vs. INPUT VOLTAGE
-20
I
I+
CC
NO-LOAD SUPPLY CURRENT
+ I
10
10
vs. TEMPERATURE
vs. INPUT VOLTAGE
DD
0
TEMPERATURE (°C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
20
15
15
40
I
I
OUT
OUT
20
20
60
= 12A
= 0.3A
80
85
25
25
7