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MAX16909

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

with Low Operating Current

Pin Configurations

Pin Descriptions

PIN

NAME

FUNCTION

TSSOP

TQFN

1

15

FSYNC

Synchronization Input. The device synchronizes to an external signal applied to FSYNC.

The external clock frequency must be 10% greater than the internal clock frequency for

proper operation. Connect FSYNC to GND if the internal clock is used.

2

16

FOSC

Resistor-Programmable Switching-Frequency Setting Control Input. Connect a resistor

from FOSC to GND to set the switching frequency.

3

1

PGOOD

4

2

OUT

Switch Regulator Output. OUT also provides power to the internal circuitry when the out-

put voltage of the converter is set between 3V and 5V during standby mode.

5

3

FB

Feedback Input. Connect an external resistive divider from OUT to FB and GND to set

the output voltage. Connect to BIAS to set the output voltage to 5V.

6

4

COMP

Error-Amplifier Output. Connect an RC network from COMP to GND for stable operation.

See the Compensation Network section for more details.

7

5

BIAS

Linear Regulator Output. BIAS powers up the internal circuitry. Bypass with a 1FF

capacitor to ground.

8

6

GND

Ground

9

7

BST

High-Side Driver Supply. Connect a 0.1FF capacitor between LX and BST for proper

operation.

+

+

TSSOP

13

4

14

3

15

2

16

1

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10

7

11

6

9

8

12

5

EP

EP

MAX16909

MAX16909

15

16

14

13

6

5

7

8

1

2

I.C.

4

12

11

9

FSYNC

FOSC

SUP

BST

GND

BIAS

3

10

EN

TQFN

(5mm × 5mm)

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