24V Internal Switch, 100% Duty Cycle,

Step-Down Converters

4

_______________________________________________________________________________________

Typical Operating Characteristics

3.27

3.29

3.28

3.31

3.30

3.32

3.33

0

100

50

150

200

MAX1836EUT33

OUTPUT VOLTAGE vs. LOAD CURRENT

LOAD CURRENT (mA)

FIGURE 1

100

95

90

85

80

70

0.1

10

100

1

1000

MAX1836EUT33

EFFICIENCY vs. LOAD CURRENT

LOAD CURRENT (mA)

75

FIGURE 1

3.27

3.29

3.28

3.31

3.30

3.32

3.33

0

150

200

50

100

250

300

350

MAX1837EUT33

OUTPUT VOLTAGE vs. LOAD CURRENT

LOAD CURRENT (mA)

FIGURE 2

100

95

90

85

80

70

0.1

10

100

1

1000

MAX1837EUT33

EFFICIENCY vs. LOAD CURRENT

LOAD CURRENT (mA)

75

FIGURE 2

0

40

20

100

80

60

160

140

120

180

0

100

150

50

200

250

300

350

MAX1837EUT33

SWITCHING FREQUENCY vs. LOAD CURRENT

LOAD CURRENT (mA)

FIGURE 2

3.27

3.29

3.28

3.31

3.30

3.32

3.33

0

4

8

12162024

MAX1837EUT33

OUTPUT VOLTAGE vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

FIGURE 2

L1 = 47

µH

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.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

LX Zero-Crossing Threshold

-75

+75

mV

Shutdown Input Threshold

0.8

2.4

V

Shutdown Leakage Current

-1

+1

µA

ELECTRICAL CHARACTERISTICS (continued)