MCP1253-33X50I/MS Microchip Technology, MCP1253-33X50I/MS Datasheet - Page 8

• Manufacturer Part Number: MCP1253-33X50I/MS
• Description: IC CHRGPUMP DC/DCCONV 3.3V 8MSOP
• Manufacturer: Microchip Technology
• Type: Step-Down (Buck), Step-Up (Boost), Switched Capacitor (Charge Pump)r

Specifications of MCP1253-33X50I/MS

• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3V, 5V
• Current - Output: 120mA
• Frequency - Switching: 1MHz
• Voltage - Input: 2 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Function: Step Up/Step Down
• Output Voltage: 3.3 V or 5 V
• Output Current: 150 mA
• Maximum Operating Temperature: + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP1252/3
3.0
TABLE 3-1:
3.1
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 V
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
Bypass to GND with a filter capacitor.
3.3
It is recommended that V
capacitor.
3.4
It is recommended that the ground pin be tied to a
ground plane for best performance.
3.5
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.
DS21752A-page 8
Pin
No.
1
2
3
4
5
6
7
8
SELECT
PGOOD
PIN FUNCTIONS
Open-Drain Power Good Output
(PGOOD)
Regulated Output Voltage (V
Power Supply Input (V
Ground (GND)
Flying Capacitor Negative
Terminal (C-)
SHDN
Name
V
GND
V
C+
FB
OUT
C-
IN
PIN FUNCTION TABLE
Open-Drain Power GOOD Output
Regulated Output Voltage
Power Supply Input
Ground Terminal
Flying Capacitor Negative Terminal
Flying Capacitor Positive Terminal
Shutdown Mode, Active-Low Input
Output Voltage Select Pin.
(MCP1252-33X50, MCP1253-33X50)
Feedback Input Pin for Adjustable Output
(MCP1252-ADJ, MCP1253-ADJ)
IN
OUT
be tied to a ceramic bypass
is within 3% (typical) of
Function
IN
)
OUT
)
3.6
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
A logic-low signal applied to SHDN disables the device.
A logic-high signal applied to this pin allows normal
operation.
3.8
MCP1252-33X50, MCP1253-33X50:
SELECT: Select Input Pin.
Connect SELECT to V
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 V
Flying Capacitor Positive Terminal
(C+)
Shutdown Input (SHDN)
Select (SELECT) Input or
Feedback (FB) Input
OUT
value (1.5V to 5.5V).
IN
for 3.3V fixed output. Connect
2002 Microchip Technology Inc.