Typical operating characteristics – Rainbow Electronics MAX1813 User Manual
Page 8
MAX1813
Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
8
_______________________________________________________________________________________
Typical Operating Characteristics
(Circuit from Figure 1, components from Table 2, T
A
= +25
°C, unless otherwise noted.)
100
50
0.01
0.1
1
10
100
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 1.4V)
60
MAX1813 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
A1
B1
C1
D1
C2
D2
B2
A2
100
50
0.01
0.1
1
10
100
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 1.1V)
60
MAX1813 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
A1
B1
C1
D1
C2
D2
B2
A2
100
50
0.01
0.1
1
10
100
EFFECTIVE EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 1.4V)
60
MAX1813 toc03
LOAD CURRENT (A)
EFFECTIVE EFFICIENCY (%)
70
80
90
A1
B1
C1
D1
C2
D2
B2
A2
100
50
0.01
0.1
1
10
100
EFFECTIVE EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 1.1V)
60
MAX1813 toc04
LOAD CURRENT (A)
EFFECTIVE EFFICIENCY (%)
70
80
90
A1
B1
C1
D1
C2
D2
B2
A2
1.28
1.30
1.32
1.34
1.36
1.38
1.40
1.42
1.44
0
10
5
15
20
25
30
OUTPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 1.4V)
MAX1813 toc05
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
V
BATT
= 24V
V
BATT
= 7V
PWM MODE
SKIP MODE
0
10
5
15
20
25
30
OUTPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 1.1V)
MAX1813 toc06
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
1.00
1.04
1.02
1.08
1.06
1.12
1.10
1.14
V
BATT
= 24V
V
BATT
= 7V
PWM MODE
SKIP MODE
0
50
100
150
200
250
300
350
400
0
10
5
15
20
25
30
SWITCHING FREQUENCY
vs. LOAD CURRENT
MAX1813 toc07
LOAD CURRENT (A)
SWITCHING FREQUENCY (kHz)
PWM MODE
SKIP MODE
V
OUT
= 1.4V
V
BATT
= 7V
275
285
295
305
315
325
0
8
4
12
16
20
24
SWITCHING FREQUENCY
vs. BATTERY INPUT VOLTAGE
MAX1813 toc08
BATTERY INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
I
OUT
= 10A
V
OUT
= 1.4V
V
OUT
= 1.1V
EFFICIENCY CURVE LEGEND
SKIP MODE (SKIP = GND)
A1:
V+ = 4.5V
B1:
V+ = 7V
C1:
V+ = 15V
D1:
V+ = 24V
PWM MODE (SKIP = V
CC
)
A2:
V+ = 4.5V
B2:
V+ = 7V
C2:
V+ = 15V
D2:
V+ = 24V