MAX1836(2002) View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX1836 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 = -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER
LX Zero-Crossing Threshold
Shutdown Input Threshold
Shutdown Leakage Current
SYMBOL
CONDITIONS
V SHDN
ISHDN
VIN = 4.5V to 24V (Note 3)
VSHDN = 0 or 24V
MIN TYP MAX UNITS
-75
+75 mV
0.8
2.4
V
-1
+1
µA
Note 2: When using the shutdown input, the maximum output voltage allowed with external feedback is 5.5V. If the output voltage is
set above 5.5V, connect shutdown to the input.
Note 3: Shutdown input minimum slew rate (rising or falling) is 10V/ms.
Note 4: Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(Circuits of Figures 1 (MAX1836) and 2 (MAX1837), VIN = 12V, SHDN = IN, TA = +25°C.)
MAX1836EUT33
OUTPUT VOLTAGE vs. LOAD CURRENT
3.33
FIGURE 1
3.32
VIN = 5V
3.31
3.30
3.29 VIN = 9V to 12V
3.28
3.27
0
50
100
150
200
LOAD CURRENT (mA)
MAX1837EUT33
EFFICIENCY vs. LOAD CURRENT
100
FIGURE 2
95 VOUT = 3.3V
90
VIN = 5V
VIN = 9V
85
80
75
70
0.1
VIN = 12V
1
10
100
1000
LOAD CURRENT (mA)
MAX1836EUT33
EFFICIENCY vs. LOAD CURRENT
100
FIGURE 1
95 VOUT = 3.3V
VIN = 5V
90
VIN = 9V
85
80
VIN = 12V
75
70
0.1
1
10
100
1000
LOAD CURRENT (mA)
MAX1837EUT33
SWITCHING FREQUENCY vs. LOAD CURRENT
180
FIGURE 2
160 VOUT = 3.3V
140
VIN = 9V
120
VIN = 12V
100
80
60
40
20
VIN = 5V
0
0 50 100 150 200 250 300 350
LOAD CURRENT (mA)
MAX1837EUT33
OUTPUT VOLTAGE vs. LOAD CURRENT
3.33
FIGURE 2
3.32
3.31
VIN = 9V VIN = 5V
3.30
VIN = 12V
3.29
3.28
3.27
0
50 100 150 200 250 300 350
LOAD CURRENT (mA)
MAX1837EUT33
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.33
IOUT = 10mA
3.32
3.31
IOUT = 200mA
3.30
3.29
3.28 FIGURE 2
VOUT = 3.3V
L1 = 47µH
3.27
048
12 16 20 24
INPUT VOLTAGE (V)
4 _______________________________________________________________________________________
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