MP2158 – 1A, 6V, 1.5MHz SYNCHRONOUS STEP-DOWN SWITCHER
PIN FUNCTIONS
Pin #
Name Description
Power Good Indicator. The output of this pin is an open drain with internal pull up resistor
to IN. PGOOD is pulled up to IN when the FB voltage is within 10% of the regulation
level, if FB voltage is out of that regulation range, it is LOW.
8
PG
Supply Voltage. The MP2158 operates from a +2.5V to +6V unregulated input. C1 is
needed to prevent large voltage spikes from appearing at the input.
7
VIN
SW
6
5
4
3
Switch Output
PGND Power ground
OUT Input sense pin for output voltage
AGND Analogy ground for internal control circuit
Feedback pin. An external resistor divider from the output to GND, tapped to the FB pin,
sets the output voltage.
2
1
FB
EN
On/Off Control
MP2158 Rev. 1.0
10/10/2012
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