MCP1253 データシートの表示（PDF） - Microchip Technology
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MCP1253 Datasheet PDF : 20 Pages
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MCP1252/3
3.0 PIN FUNCTIONS
TABLE 3-1: PIN FUNCTION TABLE
Pin
No.
Name
Function
1 PGOOD Open-Drain Power GOOD Output
2
VOUT Regulated Output Voltage
3
VIN Power Supply Input
4
GND Ground Terminal
5
C- Flying Capacitor Negative Terminal
6
C+ Flying Capacitor Positive Terminal
7
SHDN Shutdown Mode, Active-Low Input
8 SELECT Output Voltage Select Pin.
(MCP1252-33X50, MCP1253-33X50)
FB Feedback Input Pin for Adjustable Output
(MCP1252-ADJ, MCP1253-ADJ)
3.1 Open-Drain Power Good Output
(PGOOD)
PGOOD is a high-impedance when the output voltage
is in regulation. A logic-low is asserted when the output
falls 7% (typical) below the nominal value. The PGOOD
output remains low until VOUT is within 3% (typical) of
its nominal value. On start-up, this pin indicates when
the output voltage reaches its final value. PGOOD is
high-impedance when SHDN is low.
3.2 Regulated Output Voltage (VOUT)
Bypass to GND with a filter capacitor.
3.3 Power Supply Input (VIN)
It is recommended that VIN be tied to a ceramic bypass
capacitor.
3.4 Ground (GND)
It is recommended that the ground pin be tied to a
ground plane for best performance.
3.5 Flying Capacitor Negative
Terminal (C-)
The charge pump capacitor (flying capacitor) is used to
transfer charge from the input supply to the regulated
output.
It is recommended that a low ESR (equivalent series
resistance) capacitor be used.
3.6 Flying Capacitor Positive Terminal
(C+)
The charge pump capacitor (flying capacitor) is used to
transfer charge from the input supply to the regulated
output.
Proper orientation is imperative when using a polarized
capacitor.
3.7 Shutdown Input (SHDN)
A logic-low signal applied to SHDN disables the device.
A logic-high signal applied to this pin allows normal
operation.
3.8 Select (SELECT) Input or
Feedback (FB) Input
MCP1252-33X50, MCP1253-33X50:
SELECT: Select Input Pin.
Connect SELECT to VIN for 3.3V fixed output. Connect
SELECT to GND for a 5.0V fixed output.
MCP1252-ADJ, MCP1253-ADJ:
FB: Feedback Pin.
A resistor divider connected to this pin determines the
adjustable VOUT value (1.5V to 5.5V).
DS21752B-page 8
2002-2013 Microchip Technology Inc.
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