MAX1945REUI datasheet(8/19 Pages) MAXIM

Part #	MAX1945REUI

Description	1MHz, 1% Accurate, 6A Internal Switch Step-Down Regulators

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Manufacturer	MAXIM [Maxim Integrated Products]

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1MHz, 1% Accurate, 6A Internal Switch

Step-Down Regulators

8

_______________________________________________________________________________________

Typical Operating Characteristics

(VIN = VCC = 5V, VOUT = 1.8V, IOUT = 6A, fSW = 500kHz, VDD = VCC, and TA = +25°C, unless otherwise noted.)

EFFICIENCY vs. OUTPUT CURRENT

VIN = VCC = 5V

IOUT (A)

6

5

3

4

2

1

10

20

30

40

50

60

70

80

90

100

0

07

A

B

C

D

E

A: VOUT = 0.8V

B: VOUT = 1.5V

C: VOUT = 1.8V

D: VOUT = 2.5V

E: VOUT = 3.3V

VIN = VCC = 5V

fSW = 500kHz

EFFICIENCY vs. OUTPUT CURRENT

VIN = VCC = 3.3V

IOUT (A)

6

5

3

4

2

1

10

20

30

40

50

60

70

80

90

100

0

07

A

B

C

D

A: VOUT = 0.8V

B: VOUT = 1.5V

C: VOUT = 1.8V

D: VOUT = 2.5V

VIN = VCC = 3.3V

fSW = 500kHz

EFFICIENCY vs. OUTPUT CURRENT

VIN = 2.5V, VCC = 5V

IOUT (A)

6

5

3

4

2

1

10

20

30

40

50

60

70

80

90

100

0

07

A

B

C

A: VOUT = 0.8V

B: VOUT = 1.5V

C: VOUT = 1.8V

VIN = 2.5V, VCC = 5V

fSW = 500kHz

REFERENCE VOLTAGE

vs. REFERENCE SOURCE CURRENT

IREF (

µA)

36

32

28

24

20

16

12

8

4

2.005

2.010

2.015

2.020

2.025

2.030

2.000

040

fSW = 500kHz

FREQUENCY vs. INPUT VOLTAGE (500kHz)

VIN (V)

5.0

4.5

3.0

3.5

4.0

480

490

500

510

520

530

540

550

470

2.5

5.5

+85

°C

+25

°C

-40

°C

FREQUENCY vs. INPUT VOLTAGE (1MHz)

VIN (V)

5.0

4.5

3.0

3.5

4.0

0.925

0.950

0.975

1.000

1.025

1.050

0.900

2.5

5.5

+85

°C

+25

°C

-40

°C

OUTPUT LOAD REGULATION

IOUT (A)

5

4

3

2

1

0.5

1.0

1.5

2.0

2.5

3.0

0

06

fSW = 500kHz

2.5V

1.8V

0.8V

SHUTDOWN SUPPLY CURRENT

vs. INPUT VOLTAGE

VIN (V)

5.0

4.5

4.0

3.5

3.0

2

4

6

8

10

12

14

0

2.5

5.5

fSW = 500kHz

CURRENT LIMIT

vs. OUTPUT VOLTAGE

VOUT (V)

2.8

2.3

1.3

1.8

7

8

9

10

11

12

13

14

6

0.8

3.3

fSW = 500kHz

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