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MCP1663 9V/12V/24V Output Boost Regulator Evaluation Board User’s Guide

DS50002364A-page 12

 2015 Microchip Technology Inc.

FIGURE 1-1:

Typical MCP1663 Boost Converter Two Alkaline Cells Input.

1.2.1

HIGH INPUT VOLTAGE CONFIGURATION

The MCP1663 9V/12V/24V Output Boost Regulator Evaluation Board comes with two

additional configurations that can be used to extend and overcome the typical low VIN

voltage range, providing significantly more flexibility for applications powered from a

higher input. The MCP1663 high-input voltage boost converter (the bottom circuit on

the evaluation board) comes with two different solutions that can be used to extend the

application's input voltage range beyond its typical values. For this circuit, VIN

represents the voltage applied between the VIN and GND test points on the board and

VDD represents the voltage that will be present on the MCP1663 input pin.

• The first option used for driving the MCP1663’s low input (VDD) voltage internal

circuitry is to use a linear dropout regulator (LDO) to step-down the application

supply voltage (VIN) to 5V.

• The second solution to limit the VIN voltage is to use a Zener diode regulator.

The MCP1663 low input quiescent current keeps the LDO and the Zener diode circuitry

power losses at a low level.

VIN

GND

VFB

VIN

2.4V - 3.2V

VOUT

12V, >100 mA

COUT

10 µF

CIN

10 µF

4.7 µH

1.05 M



120 k



OFF

20V, 500 mA

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