MAX16909RATE datasheet(5/18 Pages) MAXIM

Part #	MAX16909RATE

Description	36V, 220kHz to 1MHz Step-Down Converter with Low Operating Current

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Manufacturer	MAXIM [Maxim Integrated Products]

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�� Maxim Integrated Products 5

MAX16909

36V, 220kHz to 1MHz Step-Down Converter

with Low Operating Current

Typical Operating Characteristics

(VSUP = VSUPSW = VEN = 14V, VOUT = 1.8V, R1 = 80.6kΩ, R2 = 100kΩ, TA = +25NC (Figure 4), unless otherwise noted.)

SWITCHING FREQUENCY vs. ILOAD

(1.8V/400kHz)

391

392

393

394

395

396

397

398

399

400

390

ILOAD (A)

2.5

2.0

1.5

1.0

0.5

0

3.0

VIN = 14V

SWITCHING FREQUENCY vs. RFOSC

RFOSC (kI)

100

90

70 80

40 50 60

30

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

0

20

110

VIN = 14V

0.01

0.001

0.0001

0

0.1

EFFICIENCY vs. LOAD CURRENT

VIN = 14V

LOAD CURRENT (A)

10

20

30

40

50

60

70

80

90

100

0

1.8V

3.3V

5V

8V

D1: B360B-13-F, DIODES

L1: DRA125-150-R,

COOPER BUSSMANN

EFFICIENCY vs. LOAD CURRENT

VIN = 14V

LOAD CURRENT (A)

0

0.5

1.5

1.0

2.5

2.0

3.0

10

20

30

40

50

60

70

80

90

100

0

DIODE: B360B-13-F FROM DIODES

INDUCTOR: DRA125-150-R,

COOPER BUSSMANN

1.8V

3.3V

5V

8V

MAX16909 toc02

VIN

VOUT

VPGOOD

5V/div

1V/div

0V

2ms/div

STARTUP INTO NO LOAD

(1.8V/400kHz)

STARTUP INTO HEAVY LOAD

(1.8V/400kHz)

MAX16909 toc01

VIN

VOUT

ILOAD

VPGOOD

5V/div

1V/div

2A/div

0V

0A

0V

2ms/div

0.6I RESISTIVE LOAD

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