MAX1745EUB+ datasheet(5/15 Pages) MAXIM

Part #	MAX1745EUB+

Description	High-Voltage, Step-Down DC-DC Controllers in μMAX

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Manufacturer	MAXIM [Maxim Integrated Products]

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High-Voltage, Step-Down DC-DC

Controllers in µMAX

_______________________________________________________________________________________

5

100

0

0.0001

0.001

0.01

0.1

1

10

EFFICIENCY vs. LOAD CURRENT

(VOUT = +3.3V)

20

LOAD CURRENT (A)

40

60

80

A: VIN = +5.5V

B: VIN = +12.0V

C: VIN = +24.0V

D: VIN = +36.0V

C

D

B

A

100

0

0.0001

0.001

0.01

0.1

1

10

EFFICIENCY vs. LOAD CURRENT

(VOUT = +5.0V)

20

LOAD CURRENT (A)

40

60

80

A: VIN = +7.2V

B: VIN = +12.0V

C: VIN = +24.0V

D: VIN = +36.0V

B

A

D

C

80

85

90

95

100

105

110

0

10203040

IN PIN QUIESCENT CURRENT

vs. INPUT VOLTAGE (5.5V TO 36V)

INPUT VOLTAGE (V)

0

1

4

5

6

3.5

4.5

5.5

IN PIN QUIESCENT CURRENT

vs. INPUT VOLTAGE (3.5V TO 5.5V)

INPUT VOLTAGE (V)

2

3

VOUT = 3.3V

0

60

40

20

80

120

100

140

0

10203040

SWITCHING FREQUENCY

vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

VOUT = 3.3V

IOUT = 2.0A

IN PIN QUIESCENT CURRENT

vs. TEMPERATURE

TEMPERATURE (

°C)

100

75

25

50

0

-25

86

87

88

89

90

91

92

93

94

95

85

-50

125

0

40

20

60

100

80

120

0

1000

2000

3000

4000

5000

EXT RISE AND FALL TIMES

vs. CAPACITANCE

CAPACITANCE (pF)

VIN = +5V

tFALL

tRISE

EXT RISE AND FALL TIMES

vs. TEMPERATURE

TEMPERATURE (

°C)

100

75

25

50

0

-25

5

10

15

20

25

30

35

40

45

50

0

-50

125

tRISE

tFALL

VIN = +5V

CL = 1000pF

CURRENT-SENSE TRIP LEVEL

vs. TEMPERATURE

TEMPERATURE (

°C)

100

75

50

25

0

-25

90

95

100

105

110

115

85

-50

125

Typical Operating Characteristics

(Circuit of Figure 1, TA = +25°C, unless otherwise specified.)

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