MCP1601_13 datasheet(9/24 Pages) MICROCHIP

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DS21762B-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).

Name

Function

1VIN

Input Voltage

2SHDN

Shutdown Input

Feedback Input

4AGND

Analog Ground Return

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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