MAX1837(2002) Ver la hoja de datos (PDF) - Maxim Integrated
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MAX1837 Datasheet PDF : 13 Pages
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24V Internal Switch, 100% Duty Cycle,
Step-Down Converters
ELECTRICAL CHARACTERISTICS (continued)
(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
Zero-Crossing Timeout
LX Switch Leakage Current
Dropout Voltage
Line Regulation
Load Regulation
SYMBOL
VDROPOUT
CONDITIONS
LX does not rise above the threshold
VIN = 18V, LX = GND, TA = +25°C
IOUT = 100mA, VIN = 5V
VIN = 5V to 24V
IOUT = 0 to 125mA (MAX1836) or 250mA
(MAX1837)
MIN TYP MAX UNITS
30
µs
1
µA
120
mV
0.05
%
0.3
%
Shutdown Input Threshold
Shutdown Leakage Current
Thermal Shutdown
V SHDN
ISHDN
VIN = 4.5V to 24V (Note 3)
V SHDN = 0 or 24V
10°C hysteresis (typ)
0.8
-1
160
2.4
V
+1
µA
°C
ELECTRICAL CHARACTERISTICS
(Circuits of Figures 1 (MAX1836) and 2 (MAX1837), VIN = 12V, SHDN = IN, TA = -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER
Input Supply Range
Input Undervoltage Lockout
Threshold
Input Supply Current
Input Shutdown Current
SYMBOL
VIN
VUVLO
IIN
CONDITIONS
VIN rising
VIN falling
SHDN = GND
MIN TYP MAX UNITS
4.5
24
V
3.55
4.4
V
3.45
4.3
25
µA
7
µA
Output Voltage (Preset Mode)
VOUT
FB = GND,
ILOAD = 0 to 125mA
(MAX1836) or
250mA (MAX1837)
MAX183_EUT50
MAX183_EUT33
4.80
3.168
5.20
V
3.432
Output Voltage Range
(Adjustable Mode)
Feedback Set Voltage
(Adjustable Mode)
OUT Bias Current
FB Dual Mode Threshold
LX Switch Minimum Off-Time
LX Switch Maximum On-Time
LX Switch On-Resistance
LX Current Limit
VOUT (Note 2)
VFB
tOFF(MIN)
tON(MAX)
RLX
ILIM
VOUT = 5V
VFB rising or falling
VFB = 1.3V
VIN = 6V
MAX1836
MAX1837
1.25
1.200
50
0.2
7
250
500
VIN
V
1.300
V
7.4
µA
150
mV
0.6
µs
13
µs
2
Ω
450
mA
900
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