SD12 データシートの表示（PDF） - Microchip Technology

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SD12

High Voltage Input Integrated Switch Step-Down Regulator

Microchip Technology 

MCP16301

3.0 PIN DESCRIPTIONS

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

TABLE 3-1:

MCP16301

SOT-23

1

2

3

4

5

6

PIN FUNCTION TABLE

Symbol

Description

BOOST

GND

VFB

EN

VIN

SW

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

connected between the BOOST and SW pins.

Ground Pin

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

output voltage.

Enable pin. Logic high enables the operation. Do not allow this pin to float.

Input supply voltage pin for power and internal biasing.

Output switch node, connects to the inductor, freewheeling diode and the bootstrap

capacitor.

3.1 Boost Pin (BOOST)

The high side of the floating supply used to turn the

integrated N-Channel MOSFET on and off is

connected to the boost pin.

3.2 Ground Pin (GND)

The ground or return pin is used for circuit ground

connection. The length of the trace from the input cap

return, output cap return and GND pin should be made

as short as possible to minimize the noise on the GND

pin.

3.3 Feedback Voltage Pin (VFB)

The VFB pin is used to provide output voltage regulation

by using a resistor divider. The VFB voltage will be

0.800V typical with the output voltage in regulation.

3.4 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. A logic high (> 1.4V) will enable

the regulator output. A logic low (<0.4V) will ensure that

the regulator is disabled.

3.5 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. For lighter load applications, a

1 µF X7R or X5R ceramic capacitor can be used.

3.6 Switch Pin (SW)

The switch node pin is connected internally to the

N-channel switch, and externally to the SW node

consisting of the inductor and Schottky diode. The SW

node can rise very fast as a result of the internal switch

turning on. The external Schottky diode should be

connected close to the SW node and GND.

© 2011 Microchip Technology Inc.

DS25004A-page 9

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