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LPS3015

High Voltage Input Integrated Switch Step-Down Regulator

Microchip Technology 

MCP16301

To calculate the shunt resistance, the maximum IBOOST

and IZ current are used at the minimum input voltage

(Equation 4-2).

EQUATION 4-2: SHUNT RESISTANCE

RSH

=

V----I--N---M----I--N-----–----V----Z-

IBoost + IZ

VZ and IZ can be found on the Zener diode

manufacturer’s data sheet. Typical IZ = 1 mA.

VIN

15V to 30V

CIN

BOOST

EN

MCP16301 SW

VIN

FB

GND

Boost Diode VZ = 7.5V

CB

L

FW Diode

COUT

VOUT

12V

RTOP

RBOT

Boost Diode

VZ = 7.5V

VIN

12V

CIN

BOOST

EN

MCP16301 SW

VIN

FB

GND

CB

L

FW Diode

COUT

VOUT

2V

RTOP

RBOT

FIGURE 4-4:

Series Regulator Boost Supply.

Series regulator applications use a Zener diode to drop

the excess voltage. The series regulator bias source

can be input or output voltage derived, as shown in

Figure 4-4. The boost supply must remain between

3.0V and 5.5V at all times for proper circuit operation.

© 2011 Microchip Technology Inc.

DS25004A-page 15

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