MAX17761ATC 데이터 시트보기 (PDF) - Maxim Integrated

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MAX17761ATC

4.5V to 76V, 1A, High-Efficiency, Synchronous Step-Down DC-DC Converter

Maxim Integrated 

MAX17761

4.5V to 76V, 1A, High-Efficiency,

Synchronous Step-Down DC-DC Converter

Pin Configuration

TOP VIEW

VIN 1

PGND 2

VCC 3

EN/UVLO 4

RESET 5

RT/SYNC 6

MAX17761

EP*

12 LX

11 SGND

10 MODE/ILIM

9 SS

8 FB

7 EXTVCC

Pin Description

PIN

NAME

VIN

1

PGND

2

VCC

3

EN/UVLO

4

RESET

5

RT/SYNC

6

EXTVCC

7

FB

8

SS

9

MODE/ILIM

10

SGND

11

LX

12

EP

—

TDFN

(3mm x 3mm)

*EP = EXPOSED PAD , CONNECTED TO SGND

FUNCTION

Power-Supply Input. 4.5V to 76V input supply range. Decouple to PGND with a 2.2μF capacitor;

place the capacitor close to the VIN and PGND pins.

Power Ground Pin of the Converter. Connect externally to the power ground plane. Connect the

SGND and PGND pins together at the ground return path of the VCC bypass capacitor.

5V LDO Output. Bypass VCC with a 1μF ceramic capacitance to SGND.

Enable/Undervoltage Lockout Pin. Drive EN/UVLO high to enable the output. Connect to the center

of the resistor-divider between VIN and SGND to set the input voltage at which the part turns on.

Leave the pin floating for always on operation.

Open-Drain RESET Output. The RESET output is driven low if FB drops below 92% of its set

value. RESET goes high 2.1ms after FB rises above 95% of its set value.

Programmable Switching Frequency Input. Connect a resistor from RT/SYNC to SGND to set the

switching frequency of the part between 200kHz and 600kHz. An external clock can be connected

to the RT/SYNC pin to synchronize the part with an external frequency.

External Power Supply Input for the Internal LDO.

Feedback Input. Connect FB to the center tap of an external resistor-divider from the output to

SGND to set the output voltage.

Soft-Start Input. Connect a capacitor from SS to SGND to set the soft-start time.

Connect a resistor from MODE/ILIM to SGND to program the peak current limit and mode of

operation of the part. See the Current Limit and Mode of Operation Selection section for more

details.

Analog Ground.

Switching Node. Connect LX pin to the switching-side of the inductor.

Exposed Pad. Always connect EP to the SGND pin of the IC. Also, connect EP to a large GND

plane with several thermal vias for best thermal performance. Refer to the MAX17761 EV kit data

sheet for an example of the correct method for EP connection and thermal vias.

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