MCP19035-AAAAESLASHMF datasheet(26/44 Pages) MICROCHIP

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MCP19035

DS22326B-page 26

 2012-2013 Microchip Technology Inc.

5.3

Operation with Low Input Voltages

If the application requires an input voltage below 5.5V,

it is recommended to use the alternative schematic

depicted in Figure 5-4.

FIGURE 5-4:

Typical Application for Low VIN.

This connection avoids the voltage drop on the internal

voltage regulator, ensuring the correct driving of the

MOSFETs at low input voltage.

Additional care must be exercised when this alternative

schematic is used to minimize the input voltage

ripple/noise. The internal circuitry of the MCP19035

may be affected by the ripple/noise present on the VCC

pin. The RIN resistor together with CVCC capacitor form

a low-pass filter for the bias voltage (VCC voltage). The

recommended value range for this resistor is between

2.2

 and 10.

CIN

COUT

MCP19035

HDRV

LDRV

PHASE

BOOT

+VCC

CBOOT

CVCC

+VOUT

SHDN

VIN

PWRGD

COMP

+VIN

OFF

RIN

GND

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