MCP16331 datasheet(16/48 Pages) MICROCHIP

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MCP16331

DS20005308D-page 16

 2014-2021 Microchip Technology Inc.

small amount of time for the boost capacitor to recharge.

For high input voltages, there is enough precharge

current to replenish the boost capacitor charge.

For input voltages above 5.5V typical, the MCP16331

device will regulate the output voltage with no load. After

starting, the MCP16331 will regulate the output voltage

until the input voltage decreases below 4V. See

Figure 2-23 for device range of operation over input

voltage, output voltage and load.

4.2.5

ALTERNATIVE BOOST BIAS

For 3.0V to 5.0V output voltage applications, the boost

supply is typically the output voltage. For applications

with the output voltage lower than 3V or higher than 5V,

an alternative boost supply can be used.

Alternative boost supplies can be directly used from the

input, input derived, output derived or an auxiliary

system voltage.

For low-voltage output applications with unregulated

input voltage, a shunt regulator derived from the input

can be used to derive the boost supply. For applications

with high output voltage or regulated high input voltage,

a series regulator can be used to derive the boost

supply. In case the boost is biased from an external

source while in shutdown, the device will draw slightly

higher current.

FIGURE 4-3:

MCP16331 Shunt and External Boost Supply.

VOUT

VIN

CIN

COUT

BOOST

GND

RTOP

VIN

Boost Diode

FW Diode

12V

VZ =5.1V

RSH

VOUT

VIN

CIN

COUT

BOOST

GND

RTOP

RBOT

VIN

Boost Diode

FW Diode

12V

3.0V to 5.5V External Supply

RBOT

MCP16331

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