MCP1630-ESLASHMS datasheet(13/26 Pages) MICROCHIP

Part #	MCP1630-E/MS

Description	High-Speed, Microcontroller-Adaptable, Pulse Width Modulator

PDF	26 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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13 / 26 page

DS21896B-page 13

MCP1630/MCP1630V

4.6

Undervoltage Lockout (UVLO)

When the input voltage (VIN) is less than the UVLO

threshold, the VEXT is held in the low state. This will

ensure that, if the voltage is not adequate to operate

the MCP1630/V, the main power supply switch will be

held in the off state. When the UVLO threshold is

exceeded, there is some hysteresis in the input voltage

prior to the UVLO off threshold being reached. The

typical hysteresis is 75 mV. Typically, the MCP1630 will

not start operating until the input voltage at VIN is

between 3.0V and 3.1V.

4.7

Overtemperature Protection

To protect the VEXT output if shorted to VIN or GND, the

MCP1630/V VEXT output will be high-impedance if the

junction temperature is above the thermal shutdown

threshold. There is an internal 100 k

Ω pull-down resis-

tor connected from VEXT to ground to provide some

pull-down during overtemperature conditions. The

protection is set to 150°C (typ.), with a hysteresis of

18°C.

MCP1630-E/MS Datasheet(PDF) 13 Page - Microchip Technology