Typical operating characteristics – Rainbow Electronics MAX8720 User Manual
Page 7
MAX8720
Dynamically Adjustable 6-Bit VID
Step-Down Controller
_______________________________________________________________________________________
7
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 1.25V)
MAX8720 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
10
1
0.1
60
70
80
90
100
50
0.01
100
V
IN
= 12V
V
IN
= 20V
V
IN
= 7V
SKIP = GND
SKIP = V
CC
OUTPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 1.25V)
MAX8720 toc02
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
15
10
5
1.250
1.255
1.245
0
20
SKIP MODE
PWM MODE
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX8720 toc04
INPUT VOLTAGE (V)
FREQUENCY (kHz)
20
15
10
290
300
310
320
330
340
350
360
280
5
25
I
OUT
= 18A
I
OUT
= 3A
SKIP = V
CC
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE (PWM MODE)
MAX8720 toc05
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
20
15
10
5
10
15
20
25
30
0
5
25
I
CC
+ I
DD
I
IN
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE (SKIP MODE)
MAX8720 toc06
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
20
15
10
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0
5
25
I
IN
I
CC
+ I
DD
1.990
1.994
2.002
1.998
2.006
2.010
-20
20
0
40
60
80
100
REFERENCE LOAD REGULATION
MAX8720 toc07
I
REF
(
µA)
REFERENCE VOLTAGE (V)
Typical Operating Characteristics
(MAX8720 Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= 5V, TON = open, T
A
= +25°C, unless otherwise noted.)
SWITCHING FREQUENCY
vs. LOAD CURRENT
MAX8720 toc03
LOAD CURRENT (A)
SWITCHING FREQUENCY (kHz)
15
10
5
100
200
300
400
0
0
20
PWM MODE
SKIP MODE