MCP16331 datasheet(11/48 Pages) MICROCHIP

11 / 48 page

 2014-2021 Microchip Technology Inc.

DS20005308D-page 11

MCP16331

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

3.1

Switch Node Pin (SW)

The switch node pin is internally connected to the

N-Channel MOSFET switch, and externally to the SW

node, consisting of the inductor and Schottky diode.

The external Schottky diode should be connected close

to the SW node and GND.

3.2

Enable Pin (EN)

The EN pin is a logic-level input used to enable or

disable the device switching and lower the quiescent

current while disabled. By default, the MCP16331 is

enabled through an internal pull-up. To turn off the

device, the EN pin must be pulled low.

3.3

Ground Pin (GND)

The ground or return pin is used for circuit ground

connection. The length of the trace from the input

capacitor return, output capacitor return and GND pin

should be made as short as possible, to minimize the

noise on the GND pin.

3.4

Feedback Voltage Pin (VFB)

The VFB pin is used to provide output voltage regulation

by using a resistor divider. The VFB voltage will be 0.8V

typical, with the output voltage in regulation.

3.5

Boost Pin (BOOST)

The supply for the floating high-side driver, used to turn

the integrated N-Channel MOSFET on and off, is

connected to the BOOST pin.

3.6

Power Supply Input Voltage Pin

(VIN)

Connect the input voltage source to VIN. The input

source should be decoupled to GND with a

4.7 µF–20 µF capacitor, depending on the impedance of

the source and output current. The input capacitor

provides AC current for the power switch and a stable

voltage source for the internal device power. This

capacitor should be connected as close as possible to

the VIN and GND pins.

3.7

Exposed Thermal Pad Pin (EP)

There is an internal electrical connection between the

EP and GND pin for the TDFN package.

TABLE 3-1:

PIN FUNCTION TABLE

MCP16331

Symbol

Description

TDFN

SOT-23

Output switch node. Connects to the inductor, the freewheeling diode and the

bootstrap capacitor.

Enable pin. There is an internal pull-up on the VIN. To turn the device off,

connect EN to GND.

—

Not connected.

—

Not connected.

GND

Ground pin.

VFB

Output voltage feedback pin. Connect VFB to an external resistor divider to set

the output voltage.

BOOST

Boost voltage that drives the internal NMOS control switch. A bootstrap

capacitor is connected between the BOOST and SW pins.

VIN

Input supply voltage pin for power and internal biasing.

—

Exposed Thermal Pad

MCP16331 Arkusz danych(PDF) 11 Page - Microchip Technology

MCP16331 Arkusz danych(HTML) 11 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

Arkusz danych Pobierz

Link URL