MCP1703AT-1202ESLASHMB datasheet(11/31 Pages) MICROCHIP

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DS20005122B-page 11

MCP1703A

3.0

PIN DESCRIPTIONS

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

3.1

Ground Terminal (GND)

Regulator ground. Tie GND to the negative side of the

output and the negative side of the input capacitor.

There is no high current and only the LDO bias current

(2.0 µA typical) flows out of this pin. The LDO output

regulation is referenced to this pin. Minimize voltage

drops between this pin and the negative side of the

load.

3.2

Regulated Output Voltage (VOUT)

Connect VOUT to the positive side of the load and the

positive terminal of the output capacitor. The positive

side of the output capacitor should be physically

located close to the LDO VOUT pin as is practical. The

current flowing out of this pin is equal to the DC load

current.

3.3

Unregulated Input Voltage (VIN)

Connect VIN to the input unregulated source voltage.

Like all low dropout linear regulators, low source

impedance is necessary for stable operation of the

LDO. The amount of capacitance required to ensure

low source impedance depends on the proximity of the

input source capacitors or battery type. For most

applications, 1 µF of capacitance ensures stable

operation of the LDO circuit. The input capacitance

requirement can be lowered for applications that have

load currents below 100 mA. The type of capacitor

used can be ceramic, tantalum or aluminum

electrolytic. The low ESR characteristics of the ceramic

yields better noise and PSRR performance at

high-frequency.

3.4

Exposed Thermal Pad (EP)

An internal electrical connection between the Exposed

Thermal Pad (EP) and the VSS pin. They must be

connected to the same potential on the Printed Circuit

Board (PCB).

TABLE 3-1:

MCP1703A PIN FUNCTION TABLE

2x3 DFN

SOT-223

SOT-23A

SOT-89

Name

Function

2,Tab

GND

Ground Terminal

323

VOUT

Regulated Voltage Output

2,Tab

VIN

Unregulated Supply Voltage

2, 3, 5, 6, 7

—

No Connection

—

Exposed Thermal Pad (EP); must be

connected to VSS

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