MCP16413 datasheet(17/44 Pages) MICROCHIP

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DS20006394D-page 17

MCP1641X

4.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 4-1.

4.1

Undervoltage Lockout Input Pin

(UVLO), Input for Low-Voltage

Output Comparator

The UVLO and low battery comparator input use an

internal 485 mV reference. Connect the UVLO pin to

the VIN pin for a default start-up threshold of 0.85V. The

device stops switching at 0.8V typical input voltage.

Connect an external resistive divider to this pin to

increase the UVLOSTART threshold. When the battery

voltage or VIN is ramping down to the programmed

threshold, the LBO output pin will be asserted low.

4.2

Low Battery Output Pin (LBO)

The open-drain output shows a low-level warning

signal if the UVLO pin detects a battery level below the

485 mV threshold. If no external divider on the UVLO

pin is used (UVLO = VIN), low battery detection is

ineffective.

4.3

Power Good and Die

Overtemperature Pin (PGT)

The Power Good and Die Overtemperature (PGT) pin is

an open-drain output, which can be connected to VOUT

through a pull-up resistor. The pin switches to a low level

when VOUT drops below 10% of its nominal value or

when the internal die’s temperature sensor detects a

value higher than +75

C (typical).

The MCP16415/6/7/8 devices have only the Power

Good function implemented – PG pin (see Table 3-1 for

the device options).

4.4

Feedback Voltage Pin (VFB)

The VFB pin is used to provide output voltage regulation

by using a resistive divider network. The feedback

voltage is typically 0.97V.

TABLE 4-1:

PIN FUNCTION TABLE

MCP1641X

10-Lead MSOP

MCP1641X

10-Lead 3 mm x 3 mm TDFN

Symbol

Description

UVLO

Undervoltage Lockout (0.485V internal reference)

and Input Pin for Low Battery Output (LBO) Voltage

Comparator

LBO

Open-Drain Low Battery Comparator Output Pin

PGT, PG

Open-Drain Power Good and Die Overtemperature

Comparators Output Pin. Only MCP16411/2/3/4

devices have both functions implemented on the

same pin, PGT. See Table 3-1 for device options.

VFB

Feedback Voltage Pin, 0.97V Reference Voltage

VOUT

Output Voltage Pin

Switch Node, Boost Inductor Pin

PGND

Power Ground Pin

SGND

Signal Ground Pin

VIN

Input Voltage Pin

Enable Control Input Pin. The device is in shutdown

if EN is pulled to GND.

—

Exposed Thermal Pad (3 x 3 TDFN only); must be

connected to PGND and SGND.

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