MCP1641X datasheet(30/44 Pages) MICROCHIP

Part #	MCP1641X

Description	Low IQ Boost Converter with Programmable Low Battery, UVLO and Automatic Input-to-Output Bypass Operation

PDF	44 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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30 / 44 page

MCP1641X

DS20006394D-page 30

 2020-2021 Microchip Technology Inc. and its subsidiaries

FIGURE 7-3:

Dynamic LBO Threshold to Help Optimize Li-Ion Battery Life.

VOUT

VIN

GND

VFB

CIN

10 µF

4.7 µH

VOUT

–

1.5 M



360 k



39.2 k



UVLO

PGT



LBO

NMOS

COUT

10 µF

PGT

1.5 M



226 k



RH1

ENABLE



LOW BATTERY (2.8V)

UVLO START = 3.3V

LBO = 2.8V

Note:

RH and RL set the UVLOSTART to 3.3V. For battery voltage higher than 3.3V, the switching is enabled and

the device regulates to 5V. After start-up, the PGT signal turns on the NMOS switch and puts in parallel

RH and RH1, and UVLOSTART changes to 2.8V. As a result, when the battery gets discharged to 2.8V, the

LBO switches to a low level to indicate the low battery warning.

1V/div

OUT

2V/div

LBO Signal

2V/div

1s/div

= 10 mA

MCP1641X Datasheet(PDF) 30 Page - Microchip Technology

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