MP20045 – LOWER NOISE, 1A LINEAR REGULATOR
PIN DESCRIPTION
QFN8 (3X3) SOIC8E
Name Description
Pin #
Pin #
Regulator Input. Supply voltage ranges from +2.5V to 5.5V. Bypass with
2.2µF capacitor. These pins must be externally connected for proper
operation even if they are internally connected.
1, 2
7, 8
VIN
Regulator output. Bypass with a 2.2µF low-ESR capacitor to GND.
Connect all the pin together externally.
3, 4
5
1, 2
3
VOUT
Feedback Input.
For the adjustable output version, connect FB to the center point of the
external resistor divider. The feedback threshold voltage is 1.5V.
FB
For the fixed output version, connect FB to the output directly.
GND
Ground. Connect exposed pad to GND plane for optimal thermal
performance.
6
7
8
4
5
6
Expose
d pad
PG
Open-drain power-good (PG) output.
Positive polarity enable (EN) input. Regulator Enable Control Input. Drive
EN above 1.5V to turn on the MP20045. Drive EN below 0.4V to turn it off.
Do not float the EN pin.
EN
MP20045 Rev. 1.0
10/13/2010
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