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MCP1252 データシート(PDF) 8 Page - Microchip Technology

部品番号 MCP1252
部品情報  Low-Noise, Positive-Regulated Charge Pump
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP1252 データシート(HTML) 8 Page - Microchip Technology

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MCP1252/3
DS20001752C-page 8
 2002-2014 Microchip Technology Inc.
3.0
PIN FUNCTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
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).
Pin No.
Name
Function
1
PGOOD
Open-Drain Power GOOD Output
2VOUT
Regulated Output Voltage
3VIN
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)


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