LPS3015 Просмотр технического описания (PDF) - Microchip Technology

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LPS3015

High Voltage Input Integrated Switch Step-Down Regulator

Microchip Technology 

MCP16301

Boost Diode

C1

VZ = 5.1V

RSH

VIN

12V

CIN

BOOST

EN

MCP16301 SW

VIN

FB

GND

CB

L

FW Diode

COUT

VOUT

2V

RTOP

RBOT

VIN

12V

CIN

3.0V to 5.5V External Supply

BOOST

EN

MCP16301 SW

VIN

FB

GND

Boost Diode

CB

L

FW Diode

COUT

VOUT

2V

RTOP

RBOT

FIGURE 4-3:

Shunt and External Boost Supply.

Shunt Boost Supply Regulation is used for low output

voltage converters operating from a wide ranging input

source. A regulated 3.0V to 5.5V supply is needed to

provide high side-drive bias. The shunt uses a Zener

diode to clamp the voltage within the 3.0V to 5.5V

range using the resistance shown in Figure 4-3.

To calculate the shunt resistance, the boost drive

current can be estimated using Equation 4-1.

IBOOST_TYP for 3.3V Boost Supply = 0.6 mA

IBOOST_TYP for 5.0V Boost Supply = 0.8 mA.

EQUATION 4-1: BOOST CURRENT

IBOOST = IBOOST_TYP × 1.5mA

DS25004A-page 14

© 2011 Microchip Technology Inc.

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