Rainbow Electronics MAX17031 - Manual (Page 8)

MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
8 _______________________________________________________________________________________
5V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX17031 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
1 0.1
55
60
65
70
75
80
85
90
95
100
50
0.01 10
SKIP MODE
12V
20V
7V
PWM MODE
5V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX17031 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
1 0.1
55
60
65
70
75
80
85
90
95
100
50
0.01 10
SKIP MODE
12V INPUT
ULTRASONIC MODE
PWM MODE
3.3V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX17031 toc03
LOAD CURRENT (A)
EFFICIENCY (%)
1 0.1
55
60
65
70
75
80
85
90
95
100
50
0.01 10
SKIP MODE
12V
20V
7V
PWM MODE
3.3V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX17031 toc04
LOAD CURRENT (A)
EFFICIENCY (%)
1 0.1
55
60
65
70
75
80
85
90
95
100
50
0.01 10
SKIP MODE
12V INPUT
ULTRASONIC MODE
PWM MODE
SMPS OUTPUT-VOLTAGE DEVIATION
vs. LOAD CURRENT
MAX17031 toc05
LOAD CURRENT (A)
OUTPUT-VOLTAGE DEVIATION (%)
1 0.1
-2
-1
0
1
2
3
-3
0.01 10
SKIP MODE
12V INPUT
LOW-NOISE
ULTRASONIC MODE
PWM MODE
SWITCHING FREQUENCY
vs. LOAD CURRENT
MAX17031 toc06
LOAD CURRENT (A)
SWITCHING FREQUENCY (kHz)
1 0.1
10
100
1000
1
0.01 10
SKIP MODE
12V INPUT
LOW-NOISE
ULTRASONIC MODE
PWM MODE
5V LDO OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX17031 toc07
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
100 120 140 20 40 60 80
4.9
4.8
5.0
5.1
5.2
4.7
0 160
3.3V RTC OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX17031 toc08
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
8 10 2 4 6
3.2
3.1
3.3
3.4
3.5
3.0
0 12
NO-LOAD INPUT SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX17031 toc09
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
20 5 10 15
1
0.1
10
100
0.01
0 25
SKIP MODE
I CC + I DD
LOW-NOISE
ULTRASONIC MODE
PWM MODE
Typical Operating Characteristics
(Circuit of Figure 1, V IN = 12V, V DD = V CC = 5V, T A = +25°C, unless otherwise noted.)