MSP1250 datasheet(8/9 Pages) ETC

8 / 9 page

MSP1250

Power Converter 150kHz 3A

Step-down Voltage Regulator

Typical Application

1. Fixed Output Voltage Versions

2. INVERTING REGULATOR

The circuit in Figure following converts a positive input voltage to a negative output voltage

with a common ground.

The circuit operates by bootstrapping the regulator’s ground pin to

the negative output voltage, and then grounding the feedback pin, the MSP1250 generate a

negative output voltage. Since this regulator topology can produce an output voltage that is

either greater than or less than the input voltage, the maximum output current greatly

depends on both the input and output voltage. The maximum voltage appearing across the

regulator is the absolute sum of the input and output voltage, and this must be limited to a

maximum of 40V.Additional diodes are required in this regulator configuration. Diode D1 is

used to solate input voltage ripple or noise from coupling through the CIN capacitor to the

output, under light or no load conditions. Without diode D3, when the input voltage is first

applied, the charging current of CIN can pull the output positive by several volts for a short

period of time. Adding D3 prevents the output from going positive by more than a diode

voltage.

MSP1250 Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers