MAX1836 データシートの表示（PDF） - Maxim Integrated
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MAX1836 Datasheet PDF : 15 Pages
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MAX1836/MAX1837
24V Internal Switch, 100% Duty Cycle,
Step-Down Converters
Absolute Maximum Ratings
IN, SHDN to GND...................................................-0.3V to +25V
LX to GND.......................................................-2V to (VIN + 0.3V)
OUT, FB to GND.......................................................-0.3V to +6V
Continuous Power Dissipation (TA = +70°C) (Note 1)
6-Pin SOT23 (derate 8.7mW/°C above +70°C)...........696mW
6-Pin TDFN (derate 24.4mW/°C above +70°C).........1951mW
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
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.
Note 1: Thermal properties are specified with product mounted on PC board with 1in2 of copper area and still air.
Electrical Characteristics
(Circuits of Figures 1 (MAX1836) and 2 (MAX1837), VIN = 12V, SHDN = IN, TA = 0°C to +85°C. Typical values are at TA = +25°C,
unless otherwise noted.)
PARAMETER
Input Supply Range
Input Undervoltage Lockout
Threshold
Input Supply Current
Input Supply Current in Dropout
Input Shutdown Current
Output Voltage (Preset Mode)
Output Voltage Range
(Adjustable Mode)
Feedback Set Voltage
(Adjustable Mode)
OUT Bias Current
FB Bias Current
FB Dual ModeTM Threshold
LX Switch Minimum Off-Time
LX Switch Maximum On-Time
LX Switch On-Resistance
LX Current Limit
LX Zero-Crossing Threshold
SYMBOL
VIN
VUVLO
IIN
IIN(DROP)
VOUT
CONDITIONS
VIN rising
VIN falling
VIN = 5V
SHDN = GND
FB = GND,
ILOAD = 0 to 125mA
(MAX1836) or
250mA (MAX1837)
MAX183_EUT50,
MAX183_ETT50
MAX183_EUT33,
MAX183_ETT33
MIN
4.5
3.55
3.45
4.80
3.168
VOUT
(Note 2)
1.25
VFB
IFB
tOFF(MIN)
tON(MAX)
RLX
ILIM
VOUT = 5V
VFB = 0 or 1.25V, TA = +25°C
VFB rising or falling
VFB = 1.3V
VIN = 6V
MAX1836
MAX1837
1.200
-25
50
0.2
7
250
500
-75
TYP
4.0
3.9
12
18
3
5.00
3.30
1.25
2.5
100
0.4
10
1.1
312
625
MAX
24
4.4
4.3
25
7
UNITS
V
V
µA
µA
µA
5.20
V
3.432
VIN
V
1.300
V
7.4
µA
+25
nA
150
mV
0.6
µs
13
µs
2
Ω
450
mA
850
+75
mV
Dual Mode is a trademark of Maxim Integrated Products, Inc.
www.maximintegrated.com
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