MAX1836/MAX1837
24V Internal Switch, 100% Duty Cycle,
Step-Down Converters
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
IN, SHDN to GND ...................................................-0.3V to +25V
LX to GND.......................................................-2V to (V
IN
+ 0.3V)
OUT, FB to GND.......................................................-0.3V to +6V
Continuous Power Dissipation (T
A
= +70°C) (Note 1)
6-Pin SOT23 (derate 8.7mW/°C above +70°C)............696mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: Thermal properties are specified with product mounted on PC board with 1in
2
of copper area and still air.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Supply Range V
IN
4.5 24 V
V
IN
rising 3.55 4.0 4.4
Input Undervoltage Lockout
Threshold
V
UVLO
V
IN
falling 3.45 3.9 4.3
V
Input Supply Current I
IN
12 25 µA
Input Supply Current in Dropout I
IN
D ROP
V
IN
= 5V 18 µA
Input Shutdown Current SHDN = GND 3 7 µA
MAX183_EUT50 4.80 5.00 5.20
Output Voltage (Preset Mode) V
OUT
FB = GND,
I
LOAD
= 0 to 125mA
(MAX1836) or
250mA (MAX1837)
MAX183_EUT33 3.168 3.30 3.432
V
Output Voltage Range
(Adjustable Mode)
V
OUT
(Note 2) 1.25 V
IN
V
Feedback Set Voltage
(Adjustable Mode)
V
FB
1.200 1.25 1.300 V
OUT Bias Current V
OUT
= 5V 2.5 7.4 µA
FB Bias Current I
FB
V
FB
= 0 or 1.25V, T
A
= +25°C -25 +25 nA
FB Dual Mode
TM
Threshold V
FB
rising or falling 50 100 150 mV
LX Switch Minimum Off-Time t
OFF
M IN
0.2 0.4 0.6 µs
LX Switch Maximum On-Time t
ON
M AX
V
FB
= 1.3V 7 10 13 µs
LX Switch On-Resistance R
LX
V
IN
= 6V 1.1 2 Ω
MAX1836 250 312 450
LX Current Limit I
LIM
MAX1837 500 625 850
mA
LX Zero-Crossing Threshold -75 +75 mV
ELECTRICAL CHARACTERISTICS
(Circuits of Figures 1 (MAX1836) and 2 (MAX1837), V
IN
= 12V, SHDN = IN, T
A
= 0°C to +85°C. Typical values are at T
A
= +25°C,
unless otherwise noted.)
Dual Mode is a trademark of Maxim Integrated Products, Inc.
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