Operating Junction Temperature Range ...... -40°C to +125°C
Storage Temperature Range ........................ -65°C to +150°C
Junction Temperature ..................................................+150°C
Lead Temperature (soldering, 10s) ............................. +300°C
*As
per JEDEC 51 Standard Multilayer Board.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(V
IN
= +12V, V
ON/OFF
= +12V, V
SYNC
= 0V, I
OUT
= 0, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C. See the
Typical Operating Circuit.)
(Note 1)
PARAMETER
Input Voltage Range
Undervoltage Lockout
UVLO Hysteresis
Output Voltage
Output Voltage Range
Feedback Voltage
Efficiency
SYMBOL
V
IN
UVLO
UVLO
HYS
MAX5090A V
IN
= 6.5V to 76V, I
OUT
= 0 to 2A
V
OUT
V
OUT
V
FB
η
MAX5090B V
IN
= 7.5V to 76V, I
OUT
= 0 to 2A
MAX5090B V
IN
= 7V to 76V, I
OUT
= 0 to 1A
MAX5090C only
MAX5090C, V
IN
= 6.5V to 76V
MAX5090A V
IN
= 12V, I
OUT
= 1A
MAX5090B V
IN
= 12V, I
OUT
= 1A
MAX5090C V
IN
= 12V, V
OUT
= 5V, I
OUT
= 1A
Quiescent Supply Current
(Note 2)
I
Q
MAX5090A V
IN
= 6.5V to 28V
MAX5090B V
IN
= 7V to 28V
MAX5090C V
IN
= 6.5V to 28V
I
Q
MAX5090A V
IN
= 6.5V to 40V
MAX5090B V
IN
= 7V to 40V
MAX5090C V
IN
= 6.5V to 40V
I
Q
I
SHDN
MAX5090A V
IN
= 6.5V to 76V
MAX5090B V
IN
= 7V to 76V
MAX5090C V
IN
= 6.5V to 76V
V
ON/OFF
= 0V, V
IN
= 14V
3.20
4.85
4.85
1.265
1.191
1.228
80
88
88
310
310
310
310
310
310
310
310
310
19
550
550
550
570
570
570
650
650
650
45
µA
µA
µA
µA
%
V
IN
rising
CONDITIONS
MIN
6.5
5.70
6.17
0.5
3.3
5.0
5.0
3.39
5.15
5.15
11.000
1.265
V
V
V
TYP
MAX
76.0
6.45
UNITS
V
V
V
Quiescent Supply Current
(Note 2)
Quiescent Supply Current
(Note 2)
Shutdown Current
SOFT-START
Default Internal Soft-Start
Period
Soft-Start Charge Current
Soft-Start ReferenceVoltage
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C
SS
= 0
I
SS
V
SS(REF)
4.5
1.23
700
10
1.46
16.0
1.65
µs
µA
V
Maxim Integrated
│
2
MAX5090A/B/C
2A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converters
Electrical Characteristics (continued)
(V
IN
= +12V, V
ON/OFF
= +12V, V
SYNC
= 0V, I
OUT
= 0, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C. See the
Typical Operating Circuit.)
(Note 1)
PARAMETER
Peak Switch Current Limit
Switch Leakage Current
Switch On-Resistance
PFM Threshold
PFM Threshold
FB Input Bias Current
ON/OFF CONTROL INPUT
ON/OFF Input-Voltage
Threshold
ON/OFF Input-Voltage
Hysteresis
ON/OFF Input Current
Oscillator Frequency
Synchronization
Maximum Duty Cycle
SYNC High-Level Voltage
SYNC Low-Level Voltage
SYNC Minimum Pulse Width
SYNC Input Leakage
INTERNAL VOLTAGE REGULATOR
Regulator Output Voltage
Dropout Voltage
Load Regulation
Thermal Resistance
(Junction to Ambient)
THERMAL SHUTDOWN
Thermal-Shutdown Junction
Temperature
Thermal-Shutdown
Hysteresis
Note
Note
Note
Note
1:
2:
3:
4:
T
SH
T
HYST
Temperature rising
+175
20
°C
°C
∆VD/∆I
VD
V
D
V
IN
= 9V to 76V, I
OUT
= 0
6.5V ≤ V
IN
≤ 8.5V, I
OUT
= 15mA
0 to 15mA
7.0
7.8
0.5
10
8.4
V
V
Ω
-1
V
ON/OFF
Rising trip point
V
HYST
I
ON/OFF
f
0SC
f
SYNC
D
MAX
V
IN
= 6.5V to 76V, V
OUT
≤ 11V
V
ON/OFF
= 0V to V
IN
106
119
80
2.0
0.8
350
+1
95
1.180
1.38
100
10
127
100
150
200
1.546
V
mV
nA
kHz
kHz
%
V
V
ns
µA
SYMBOL CONDITIONS
I
LIM
I
OL
R
DS(ON)
I
PFM
I
PFM
I
B
(Note 3)
V
IN
= 76V, V
ON/OFF
= 0V, V
LX
= 0V
I
SWITCH
= 1A
Minimum switch current in any cycle
Minimum switch current in any cycle at
T
J
≤ +25°C (Note 4)
MAX5090C, V
FB
= 1.2V
1
14
-150
+0.1
MIN
2.4
-10
0.26
60
TYP
3.3
MAX
5.0
+10
0.4
300
300
+150
UNITS
A
µA
Ω
mA
mA
nA
INTERNAL SWITCH/CURRENT LIMIT
OSCILLATOR/SYNCHRONIZATION
PACKAGE THERMAL CHARACTERISTICS
θ
JA
TQFN package (JEDEC 51)
30
°C/W
All limits at -40°C are guaranteed by design, not production tested.
For total current consumption during switching (at no load), also see the
Typical Operating Characteristics.
Switch current at which the current-limit circuit is activated.
Limits are guaranteed by design.
www.maximintegrated.com
Maxim Integrated
│
3
MAX5090A/B/C
2A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converters
Typical Operating Characteristics
V
OUT
vs. TEMPERATURE
(MAX5090AATE, V
OUT
= 3.3V)
MAX5090 toc01
(V
IN
= 12V, V
ON/OFF
=12V, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. See the
Typical
Operating Circuit,
if applicable.)
V
OUT
vs. TEMPERATURE
(MAX5090BATE, V
OUT
= 5V)
MAX5090 toc02
3.38
3.36
3.34
V
OUT
(V)
3.32
3.30
3.28
3.26
3.24
3.22
3.20
-50
-25
0
25
50
75
I
OUT
= 2A
I
OUT
= 0
5.10
5.05
V
OUT
(V)
5.00
4.95
4.90
4.85
I
OUT
= 2A
I
OUT
= 0
3.38
3.36
3.34
V
OUT
(V)
3.32
3.30
3.28
3.26
3.24
3.22
3.20
I
OUT
= 2A
I
OUT
= 0
100 125 150
-50
-25
0
25
50
75
100 125 150
6.5
16
26
36
46
56
66
76
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
V
IN
(V)
MAX5090 toc04
MAX5090 toc05
5.10
5.05
V
OUT
(V)
5.00
4.95
4.90
4.85
I
OUT
= 2A
I
OUT
= 0
3.38
3.36
3.34
V
OUT
(V)
3.32
3.30
3.28
3.26
3.24
3.22
3.20
V
IN
= 6.5V
V
IN
= 24V
V
IN
= 76V
5.10
5.05
V
OUT
(V)
5.00
4.95
4.90
4.85
V
IN
= 6.5V
V
IN
= 24V
V
IN
= 76V
6.5
16
26
36
46
56
66
76
0.1
1
10
100
I
LOAD
(mA)
1000
10,000
0.1
1
10
100
I
LOAD
(mA)
1000
10,000
V
IN
(V)
MAX5090 toc07
MAX5090 toc08
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
400
800
1200
1600
V
IN
= 6.5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 48V
V
IN
= 76V
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
V
IN
= 6.5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 48V
V
IN
= 76V
OUTPUT CURRENT LIMIT (A)
3.5
3.0
2.5
2.0
1.5
1.0
V
OUT
= 3.3V
5% DROP IN V
OUT
PULSED OUTPUT LOAD
2000
0
400
800
1200
1600
2000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
-50
-25
0
25
50
75
100 125 150
AMBIENT TEMPERATURE (°C)
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Maxim Integrated
│
4
MAX5090 toc09
100
EFFICIENCY vs. LOAD CURRENT
(MAX5090AATE, VOUT = 3.3V)
100
EFFICIENCY vs. LOAD CURRENT
(MAX5090BATE, V
OUT
= 5V)
OUTPUT CURRENT LIMIT
vs. TEMPERATURE (MAX5090AATE)
4.0
MAX5090 toc06
5.15
LINE REGULATION
(MAX5090BATE, V
OUT
= 5V)
3.40
LOAD REGULATION
(MAX5090AATE, V
OUT
= 3.3V)
5.15
LOAD REGULATION
(MAX5090BATE, V
OUT
= 5V)
MAX5090 toc03
3.40
5.15
3.40
LINE REGULATION
(MAX5090AATE, V
OUT
= 3.3V)
MAX5090A/B/C
2A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converters
Typical Operating Characteristics (continued)
OUTPUT CURRENT LIMIT vs. TEMPERATURE
(MAX5090BATE)
MAX5090 toc010
(V
IN
= 12V, V
ON/OFF
=12V, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
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