Typical operating characteristics – Rainbow Electronics MAX5099 User Manual
Page 6
MAX5099
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
6
_______________________________________________________________________________________
Typical Operating Characteristics
(V+ = V
IN_HIGH
= 14V, unless otherwise noted. V+ = V
IN_HIGH
means that N1 is shorted externally.)
OUTPUT1 EFFICIENCY
vs. LOAD CURRENT
MAX5099 toc01
LOAD CURRENT (A)
OUTPUT1 EFFICIENCY (%)
1.8
1.6
1.2 1.4
0.6 0.8 1.0
0.4
10
20
30
40
50
60
70
80
90
100
0
0.2
2.0
V
IN
= 8V
V
IN
= 14V
V
IN
= 16V
V
OUT
= 5V
f
SW
= 1.85MHz
OUTPUT2 EFFICIENCY
vs. LOAD CURRENT
MAX5099 toc02
LOAD CURRENT (A)
OUTPUT2 EFFICIENCY (%)
0.9
0.7
0.8
0.4
0.5
0.6
0.3
10
20
30
40
50
60
70
80
90
100
0
0.2
1.0
V
IN
= 4.5V
V
IN
= 5.5V
V
OUT
= 3.3V
f
SW
= 1.85MHz
V
IN
= 14V
V
IN
= 8V
V
IN
= 16V
OUTPUT1 EFFICIENCY
vs. LOAD CURRENT
MAX5099 toc03
LOAD CURRENT (A)
OUTPUT1 EFFICIENCY (%)
1.8
1.6
1.2 1.4
0.6 0.8 1.0
0.4
10
20
30
40
50
60
70
80
90
100
0
0.2
2.0
V
IN
= 8V
V
IN
= 14V
V
IN
= 16V
V
OUT
= 5V
f
SW
= 300kHz
L1 = 18
μH
OUTPUT2 EFFICIENCY
vs. LOAD CURRENT
MAX5099 toc04
LOAD CURRENT (A)
OUTPUT2 EFFICIENCY (%)
0.9
0.8
0.6
0.7
0.4
0.5
0.3
0.2
1.0
10
20
30
40
50
60
70
80
90
100
0
V
IN
= 16V
V
IN
= 8V
V
IN
= 14V
V
IN
= 5.5V
V
IN
= 4.5V
V
OUT
= 3.3V
f
SW
= 300kHz
L2 = 27
μH
OUTPUT1 VOLTAGE
vs. LOAD CURRENT
MAX5099 toc05
LOAD CURRENT (A)
OUTPUT1 VOLTAGE (V)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
4.92
4.94
4.96
4.98
5.00
4.90
0.2
2.0
V
IN
= 8V
V
IN
= 14V
V
IN
= 16V
V
OUT
= 5V
f
SW
= 1.85MHz
OUTPUT2 VOLTAGE
vs. LOAD CURRENT
MAX5099 toc06
LOAD CURRENT (A)
OUTPUT2 VOLTAGE (V)
0.9
0.8
0.7
0.6
0.5
0.4
0.3
3.25
3.24
3.26
3.27
3.28
3.29
3.30
3.23
0.2
1.0
V
IN
= 4.5V
V
IN
= 16V
V
IN
= 14V
V
IN
= 8V
V
IN
= 5.5V
V
OUT
= 3.3V
f
SW
= 1.85MHz
V
L
OUTPUT VOLTAGE
vs. CONVERTER SWITCHING FREQUENCY
MAX5099 toc07
CONVERTER SWITCHING FREQUENCY (kHz)
V
L
OUTPUT VOLTAGE (V)
1600
1900
1300
700
1000
4.2
4.4
4.6
4.8
5.0
5.2
5.4
4.0
400
2200
V
IN
= 4.5V
V
IN
= 5.5V
V
IN
= 8V
V
IN
= 19V
V
IN
= 5V
BOTH CONVERTERS SWITCHING
FSEL_1 = V
L
EACH CONVERTER SWITCHING
FREQUENCY vs. R
OSC
MAX5099 toc08
R
OSC
(k
Ω)
SWITCHING FREQUENCY (MHz)
60
40
20
1
0
80
10
0.1
CONVERTER 1, CONVERTER 2
CONVERTER 1
FSEL_1 = V
L
,
FSEL_1 = GND,
EACH CONVERTER SWITCHING
FREQUENCY vs. TEMPERATURE
MAX5099 toc09
TEMPERATURE (
°C)
SWITCHING FREQUENCY (MHz)
-5
30
65
100
1
10
0.1
-40
135
0.3MHz
0.6MHz
1.25MHz
1.85MHz
2.2MHz
FSEL_1 = V
L