MAX1836(2002) Ver la hoja de datos (PDF) - Maxim Integrated
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MAX1836 Datasheet PDF : 13 Pages
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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
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 1in2 of copper area and still air.
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
(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
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Supply Range
Input Undervoltage Lockout
Threshold
Input Supply Current
Input Supply Current in Dropout
Input Shutdown Current
VIN
VUVLO
IIN
IIN(DROP)
VIN rising
VIN falling
VIN = 5V
SHDN = GND
4.5
24
V
3.55 4.0
4.4
V
3.45 3.9
4.3
12
25
µA
18
µA
3
7
µA
Output Voltage (Preset Mode)
VOUT
FB = GND,
ILOAD = 0 to 125mA
(MAX1836) or
250mA (MAX1837)
MAX183_EUT50
MAX183_EUT33
4.80 5.00 5.20
V
3.168 3.30 3.432
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
VOUT (Note 2)
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
1.25
VIN
V
1.200 1.25 1.300
V
2.5
7.4
µA
-25
+25
nA
50
100
150
mV
0.2
0.4
0.6
µs
7
10
13
µs
1.1
2
Ω
250 312 450
mA
500 625 850
-75
+75 mV
Dual Mode is a trademark of Maxim Integrated Products, Inc.
2 _______________________________________________________________________________________
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