MSS5121 datasheet(14/34 Pages) MICROCHIP

14 / 34 page

MCP16321/2

DS22285A-page 14

3.6

Enable Pin (EN)

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

disable the device. A logic high (> 2.2V) will enable the

regulator output, while a logic low (< 0.8V) will ensure

that the regulator is disabled. This pin is internally

pulled up to an internal reference and will be enabled

when VIN > UVLO, unless the EN pin is pulled low. The

maximum input voltage applied to the EN pin should

not exceed 6V.

3.7

BOOST Pin (BOOST)

This pin will provide the bootstrap voltage required for

driving the upper internal NMOS switch of the buck

regulator. An external ceramic capacitor placed

between the BOOST input pin and the SW pin will

provide the necessary drive voltage for the upper

switch. During steady state operation, the capacitor is

recharged on every low-side, synchronous switching

cycle. If the Switch mode approaches 100% duty cycle

for the high-side MOSFET, the device will automatically

reduce the duty cycle switch to a minimum off time of

240 ns on every 8th cycle to recharge the boost

capacitor.

3.8

Power Ground Pin (PGND)

This is a separate ground connection used for the low-

side synchronous switch to isolate switching noise from

the rest of the device.

3.9

Exposed Thermal Pad (EP)

There is no internal electrical connection between the

Exposed Thermal Pad (EP) and the PGND and SGND

pins. The EP must be connected to GND on the Printed

Circuit Board (PCB).

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