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MCP1601 Datasheet(PDF) 9 Page - Microchip Technology

Part # MCP1601
Description  500 mA Synchronous BUCK Regulator
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP1601 Datasheet(HTML) 9 Page - Microchip Technology

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 2003 Microchip Technology Inc.
DS21762A-page 9
MCP1601
3.0
PIN FUNCTIONS
TABLE 3-1:
PIN FUNCTION TABLE
3.1
Input Voltage (VIN)
Connect the unregulated input voltage source to VIN. If
the input voltage source is located more than several
inches away, or is a battery, a typical input capacitor of
10 µF is recommended.
3.2
Shutdown Input (SHDN)
Connect SHDN to a logic low input to force the device
into a shutdown low quiescent current mode. When in
shutdown,
both
the
P-Channel
and
N-Channel
switches are turned off, in addition to the internal oscil-
lator and other circuitry. When connected to a logic high
input, the device will operate in the selected mode.
3.3
Feedback Input (FB)
Connect FB to an external resistor divider to set output
voltage regulation. The feedback pin is typically equal
to 0.8V. See Section 5.0, “Applications Information”, for
details in selecting feedback resistors.
3.4
Analog Ground Return (AGND)
Tie all small signal ground returns to AGND. (See
Section 5.6, “Printed Circuit Board Layout”, for details).
3.5
Oscillator Synchronization or
PWM/ PFM Select Mode Input
(SYNC/PWM)
Connect an external oscillator to SYNC/PWM to syn-
chronize. With an external oscillator present, the device
is forced into a PWM-only mode of operation. For inter-
nal oscillator operation, the SYNC/PWM pin is tied high
to operate in a forced PWM-only mode and low for a
PWM/PFM mode of operation.
3.6
Output Voltage Sense (VOUT)
Connect the output voltage directly to VOUT for sensing.
3.7
Power Ground Return (PGND)
Connect all large signal ground returns to PGND. (See
Section 5.6, “Printed Circuit Board Layout”, for details).
3.8
BUCK Inductor Connection (LX)
Connect LX directly to the BUCK inductor. This pin car-
ries large signal-level currents and all connections
should be as short and wide as possible. (See
Section 5.6, “Printed Circuit Board Layout”, for details).
Pin
Name
Function
1VIN
Input Voltage
2SHDN
Shutdown Input
3
FB
Feedback Input
4AGND
Analog Ground Return
5
SYNC/
PWM
Oscillator Synchronization or
PWM/ PFM Select Mode Input
6VOUT
Sensed Output Voltage Input
7PGND
Power Ground Return
8LX
BUCK Inductor Output


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