MCP16251_16 datasheet(9/32 Pages) MICROCHIP

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DS20005173B-page 9

MCP16251/2

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

3.1

Feedback Voltage Pin (VFB)

The VFB pin is used to provide output voltage regulation

by using a resistor divider. Feedback voltage will

typically be 1.23V, with the output voltage in regulation.

3.2

Signal Ground Pin (SGND)

The signal ground pin is used as a return for the

integrated VREF and error amplifier. In the 2x3x0.8

TDFN package, the SGND and power ground (PGND)

pins are connected externally.

3.3

Power Ground Pin (PGND)

The power ground pin is used as a return for the

high-current N-Channel switch. In the 2x3x0.8 TDFN

package, the PGND and signal ground (SGND) pins are

connected externally.

3.4

Enable Pin (EN)

The EN pin is a logic-level input used to enable or

disable device switching and lower quiescent current

while disabled. A logic high (>70% of VIN) will enable

the regulator output. A logic low (<20% of VIN) will

ensure that the regulator is disabled.

3.5

Switch Node Pin (SW)

Connect the inductor from the input voltage to the SW

pin. The SW pin carries inductor current and can be as

high

650 mA

typical

peak.

The

integrated

N-Channel switch drain and integrated P-Channel

switch source are internally connected at the SW node.

3.6

Output Voltage Power Pin (VOUTP)

The output voltage power pin connects the output volt-

age to the switch node. High current flows through the

integrated P-Channel and out of this pin to the output

capacitor and output. In the 2x3x0.8 TDFN package,

VOUTS and VOUTP are connected externally.

3.7

Output Voltage Sense Pin (VOUTS)

The output voltage sense pin connects the regulated

output voltage to the internal bias circuits. In the

2x3x0.8 TDFN package, VOUTS and VOUTP are

connected externally.

3.8

PowerSupply InputVoltage Pin (VIN)

Connect the input voltage source to VIN. The input

source should be decoupled to GND with a 4.7 µF

minimum capacitor.

3.9

Exposed Thermal Pad (EP)

There is no internal electrical connection between the

Exposed Thermal Pad (EP) and the PGND and SGND

pins. They must be connected to the same potential on

the Printed Circuit Board (PCB).

3.10

Ground Pin (GND)

The ground or return pin is used for circuit ground

connection. Length of trace from input cap return,

output cap return and GND pin should be made as

short as possible to minimize noise on the GND pin. In

the SOT23-6 package, a single ground pin is used.

3.11

Output Voltage Pin (VOUT)

The output voltage pin connects the integrated

P-Channel MOSFET to the output capacitor. The

feedback voltage divider is also connected to the VOUT

pin for voltage regulation.

TABLE 3-1:

PIN FUNCTION TABLE

MCP16251/2

SOT-23

MCP16251/2

TDFN 2x3x0.8

Symbol

Description

VFB

Feedback Voltage Pin

—

SGND

Signal Ground Pin

—

PGND

Power Ground Pin

Enable Control Input Pin

Switch Node, Boost Inductor Input Pin

—

VOUTP

Output Voltage Power Pin

—

VOUTS

Output Voltage Sense Pin

VIN

Input Voltage Pin

—

Exposed Thermal Pad (EP); must be connected to SGND and PGND.

—

GND

Ground Pin

—

VOUT

Output Voltage Pin

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