Owner manual
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 (%)
1.81.61.2 1.40.6 0.8 1.00.4
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 (%)
0.90.7 0.80.4 0.5 0.60.3
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 (%)
1.81.61.2 1.40.6 0.8 1.00.4
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
μ
H
OUTPUT2 EFFICIENCY
vs. LOAD CURRENT
MAX5099 toc04
LOAD CURRENT (A)
OUTPUT2 EFFICIENCY (%)
0.90.80.6 0.70.4 0.50.30.2 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
μ
H
OUTPUT1 VOLTAGE
vs. LOAD CURRENT
MAX5099 toc05
LOAD CURRENT (A)
OUTPUT1 VOLTAGE (V)
1.81.61.41.21.00.80.60.4
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)
0.90.80.70.60.50.40.3
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 19001300700 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
(kΩ)
SWITCHING FREQUENCY (MHz)
604020
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