MCP1623 datasheet(9/26 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS41420A-page 9

MCP1623/24

3.0

PIN DESCRIPTIONS

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

TABLE 3-1:

PIN FUNCTION TABLE

3.1

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 as 425 mA peak. The integrated N-Channel switch

drain and integrated P-Channel switch source are inter-

nally connected at the SW node.

3.2

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.

3.3

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 (>90% of VIN) will enable

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

ensure that the regulator is disabled.

3.4

Feedback Voltage Pin (FB)

The FB pin is used to provide output voltage regulation

by using a resistor divider. The FB voltage will be 1.21V

typical with the output voltage in regulation.

3.5

Output Voltage Pin (VOUT)

The output voltage pin connects the integrated

P-Channel MOSFET to the output capacitor. The FB

voltage divider is also connected to the VOUT pin for

voltage regulation.

3.6

Power Supply Input Voltage Pin

(VIN)

Connect the input voltage source to VIN. The input

source should be decoupled to GND with a 4.7 µF

minimum capacitor.

Pin No.

MCP1623/24 SOT23

Description

Switch Node, Boost Inductor Input Pin

GND

Ground Pin

Enable Control Input Pin

Feedback Voltage Pin

VOUT

Output Voltage Pin

VIN

Input Voltage Pin

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