Rainbow Electronics MAX1717 - Manual (Page 7)

MAX1717
Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
_______________________________________________________________________________________ 7
400
300
200
100
0
0 6 3 9 12
FREQUENCY vs. LOAD CURRENT
MAX1717 toc10
LOAD CURRENT (A)
FREQUENCY (kHz)
300kHz VOLTAGE POSITIONED, CIRCUIT 2
SKIP MODE
PWM MODE
1250
1000
750
500
250
0
0 6 3 9 12
FREQUENCY vs. LOAD CURRENT
MAX1717 toc11
LOAD CURRENT (A)
FREQUENCY (kHz)
1000kHz VOLTAGE POSITIONED, CIRCUIT 5
SKIP MODE
PWM MODE
400
350
300
250
200
5 15 10 20 25
FREQUENCY vs. INPUT VOLTAGE
MAX1717 toc12
INPUT VOLTAGE (V)
FREQUENCY (kHz)
300kHz VOLTAGE POSITIONED, CIRCUIT 2
I OUT = 12A
I OUT = 0.3A
1200
1000
800
600
400
5 15 10 20 25
FREQUENCY vs. INPUT VOLTAGE
MAX1717 toc13
INPUT VOLTAGE (V)
FREQUENCY (kHz)
1000kHz VOLTAGE POSITIONED, CIRCUIT 5
I OUT = 12A
I OUT = 0.3A
300
310
330
320
340
350
-40 0 -20 20 40 60 80 85
FREQUENCY vs. TEMPERATURE
MAX1717 toc14
TEMPERATURE ( °C)
FREQUENCY (kHz)
300kHz VOLTAGE POSITIONED, CIRCUIT 2
0
10
5
20
15
25
30
-40 0 20 -20 40 60 85 80
OUTPUT CURRENT AT CURRENT LIMIT
vs. TEMPERATURE
MAX1717 toc15
TEMPERATURE ( °C)
CURRENT (A)
300kHz VOLTAGE POSITIONED, CIRCUIT 2
0
1.0
0.5
2.0
1.5
2.5
3.0
0 10 5 15 20 25
CONTINUOUS-TO-DISCONTINUOUS
INDUCTOR CURRENT POINT
MAX1717 toc16
INPUT VOLTAGE (V)
LOAD CURRENT (A)
300kHz VOLTAGE POSITIONED, CIRCUIT 2
0
15
10
5
20
25
30
5 13 11 7 9 15 17 19 21 23 25
INDUCTOR CURRENT PEAKS AND
VALLEYS vs. INPUT VOLTAGE
MAX1717 toc17
INPUT VOLTAGE (V)
INDUCTOR CURRENT (A)
AT CURRENT-LIMIT POINT
300kHz VOLTAGE POSITIONED, CIRCUIT 2
I PEAK
I
VALLEY
1000
800
600
400
200
0
5 15 10 20 25
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1717 toc18
INPUT VOLTAGE (V)
SUPPLY CURRENT (
µ
A)
300kHz VOLTAGE POSITIONED, CIRCUIT 2,
SKIP MODE
I CC + I DD
I+
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.)