Operating Temperature Range ........................ -40°C to +125°C
Storage Temperature Range............................ -65°C to +160°C
Junction Temperature (continuous) ................................+150°C
Lead Temperature (soldering, 10s) ................................+300°C
Soldering Temperature (reflow) ......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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
= +15V, V
EN/UVLO
= +2V, COMP = open, C
IN
= 1µF, C
VCC
= 1µF, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical
values are at T
A
= +25°C.) (Note 1)
PARAMETER
INPUT SUPPLY (V
IN
)
IN Voltage Range (VIN)
IN Supply Startup Current Under
UVLO
IN Supply Current (IIN)
IN Boostrap UVLO Rising
Threshold
IN Bootstrap UVLO Falling
Threshold
IN Clamp Voltage
LINEAR REGULATOR (V
CC
)
V
CC
Output Voltage Range
V
CC
Dropout Voltage
V
CC
Current Limit
ENABLE (EN/UVLO)
EN/UVLO Threshold
EN/UVLO Input Leakage Current
Rising
Falling
0V < V
EN/UVLO
< 1.5V, T
A
= +25NC
1.18
1.11
-100
1.23
1.17
0
1.28
1.21
+100
V
nA
6V < V
IN
< 29V, 0mA < I
VCC
< 50mA
V
IN
= 4.5V, I
VCC
= 20mA
V
CC
= 0V, V
IN
= 6V
50
4.8
5
160
100
5.2
300
V
mV
mA
EN/UVLO = SGND, I
IN
= 1mA (MAX17498A) (Note 2)
MAX17498A
MAX17498B/MAX17498C
IINSTARTUP, V
IN
< UVLO or EN/UVLO = SGND
Switching, f
SW
= 250kHz (MAX17498A/MAX17498C)
Switching, f
SW
= 500kHz (MAX17498B)
MAX17498A
MAX17498B/MAX17498C
19
3.85
3.65
31
4.5
4.5
22
1.8
2
20.5
4.15
3.95
33.5
29
36
36
3
3.25
22
4.4
4.25
36
V
µA
mA
CONDITIONS
MIN
TYP
MAX
UNITS
V
V
V
Maxim Integrated
2
MAX17498A/MAX17498B/MAX17498C
AC-DC and DC-DC Peak Current-Mode Converters
for Flyback/Boost Applications
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +15V, V
EN/UVLO
= +2V, COMP = open, C
IN
= 1µF, C
VCC
= 1µF, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical
values are at T
A
= +25°C.) (Note 1)
PARAMETER
OVERVOLTAGE PROTECTION (OVI)
OVI Threshold
OVI Masking Delay
OVI Input Leakage Current
0V < V
OVI
< 1.5V, T
A
= +25NC
MAX17498A/MAX17498C
MAX17498B
MAX17498A/MAX17498C
MAX17498B
t
ONMIN
1.2
V
SS
= 400mV
9
1.11
-100
235
470
92
90
SWITCHING FREQUENCY AND MAXIMUM DUTY CYCLE (f
SW
and D
MAX
)
Switching Frequency
Maximum Duty Cycle
Minimum Controllable On Time
SOFT-START (SS)
SS Set-Point Voltage
SS Pullup Current
SS Peak Current-Limit-Enable
Threshold
ERROR AMPLIFIER (EA+, EA-, and COMP)
EA+ Input Bias Current
EA- Input Bias Current
Error-Amplifier Open-Loop
Voltage Gain
Error-Amplifier
Transconductance
Error-Amplifier Source Current
Error-Amplifier Sink Current
Current-Sense Transresistance
INTERNAL SWITCH
DMOS Switch On-Resistance
(R
DSON
)
DMOS Peak Current Limit
DMOS Runaway Current Limit
LX Leakage Current
CURRENT LIMIT (LIM)
LIM Reference Current
Peak Switch Current Limit with
LIM Open
Runaway Switch Current Limit
with LIM Open
Maxim Integrated
CONDITIONS
Rising
Falling
MIN
1.18
1.11
TYP
1.23
1.17
2
0
250
500
94.5
92
110
1.22
10
1.17
MAX
1.28
1.21
+100
265
530
97
94
UNITS
V
µs
nA
kHz
%
ns
1.24
11
1.21
V
µA
V
V
EA+
= 1.5V, T
A
= +25NC
V
EA-
= 1.5V, T
A
= +25NC
-100
-100
90
+100
+100
nA
nA
dB
V
COMP
= 2V, V
LIM
= 1V
V
COMP
= 2V, EA- < EA+
V
COMP
= 2V, EA- > EA+
1.5
80
80
0.45
1.8
120
120
0.5
2.1
210
210
0.55
mS
µA
µA
I
I
LX
= 200mA
LIM = 100K
LIM = 100K
V
LX
= 65V, T
A
= +25NC
9
0.39
0.39
1.62
1.9
175
1.9
2.3
0.1
10
0.45
0.5
380
2.23
2.6
1
11
0.54
0.6
mI
A
A
µA
µA
A
A
3
MAX17498A/MAX17498B/MAX17498C
AC-DC and DC-DC Peak Current-Mode Converters
for Flyback/Boost Applications
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +15V, V
EN/UVLO
= +2V, COMP = open, C
IN
= 1µF, C
VCC
= 1µF, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical
values are at T
A
= +25°C.) (Note 1)
PARAMETER
Number of Runaway Current-
Limit Hits Before Hiccup Timeout
Overcurrent Hiccup Timeout
SLOPE COMPENSATION (SLOPE)
SLOPE Pullup Current
SLOPE-Compensation Resistor
Range
Default SLOPE-Compensation
Ramp
POWER-GOOD SIGNAL (PGOOD)
PGOOD Output-Leakage
Current (Off State)
PGOOD Output Voltage
(On State)
PGOOD Higher Threshold
PGOOD Lower Threshold
PGOOD Delay After
EA- Reaches 95% Regulation
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
Temperature rising
+160
20
NC
NC
V
PGOOD
= 5V, TA = +25NC
I
PGOOD
= 10mA
EA- rising
EA- falling
-1
0
93.5
90.5
95
92
4
+1
0.4
96.5
93.5
µA
V
%
%
ms
MAX17498B
SLOPE = open
9
30
60
10
11
150
µA
kI
mV/µs
CONDITIONS
MIN
TYP
1
32
MAX
UNITS
#
ms
Note 1:
All devices are 100% production tested at TA = +25NC. Limits over temperature are guaranteed by design.
Note 2:
The MAX17498A is intended for use in universal input power supplies. The internal clamp circuit at IN is used to prevent the
bootstrap capacitor from charging to a voltage beyond the absolute maximum rating of the device when EN/UVLO is low
(shutdown mode). Externally limit the maximum current to IN (hence to clamp) to 2mA (max) when EN/UVLO is low.
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