MAX1973 datasheet(6/15 Pages) MAXIM

Part #	MAX1973

Description	Smallest 1A, 1.4MHz Step-Down Regulators

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Manufacturer	MAXIM [Maxim Integrated Products]

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Smallest 1A, 1.4MHz Step-Down Regulators

6

_______________________________________________________________________________________

Typical Operating Characteristics

(Circuits of Figure 2, 3, and 4; TA = +25°C, unless otherwise noted.)

100

0

0.01

0.1

1

EFFICIENCY vs. LOAD CURRENT

20

10

LOAD CURRENT (A)

40

30

60

70

50

80

90

VOUT = 2.5V

VOUT = 1V

VOUT = 1.8V

VIN = 3.3V

100

0

0.01

0.1

1

EFFICIENCY vs. LOAD CURRENT

20

10

LOAD CURRENT (A)

40

30

60

70

50

80

90

VOUT = 3.3V

VOUT = 2.5V

VIN = 5V

0

0.10

0.05

0.20

0.15

0.30

0.25

0.35

DROPOUT VOLTAGE vs. LOAD CURRENT

LOAD CURRENT (A)

0

0.2

0.4

0.6

0.8

VOUT = 3.3V

VOUT = 2.5V

0

4

2

8

6

10

12

02

13

4

5

NO-LOAD CURRENT vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

VOUT = 2.5V

1.244

1.245

1.246

1.247

1.248

1.249

1.250

1.251

1.252

0

0.2

0.4

0.6

0.8

1.0

FB VOLTAGE vs. LOAD CURRENT

LOAD CURRENT (A)

MAX1973

VIN = 5V

R1 = 22k

Ω

R2 = 13k

Ω

-4.0

-2.5

-3.0

-3.5

-2.0

-1.5

-1.0

-0.5

0

0.5

1.0

0.01

1

0.1

10

100

1000

CHANGE IN OUTPUT VOLTAGE

vs. LOAD CURRENT

LOAD CURRENT (A)

VIN = 5V

VOUT = 1.8V

2.5V

1V

1.10

1.20

1.15

1.30

1.25

1.35

1.40

24

35

6

SWITCHING FREQUENCY

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

TA = +85

°C

TA = +25

°C

TA = -40

°C

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