TC55RP5001EMB データシートの表示（PDF） - Microchip Technology

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TC55RP5001EMB

1 µA Low Dropout Positive Voltage Regulator

Microchip Technology 

3.0 PIN DESCRIPTIONS

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

TABLE 3-1: PIN FUNCTION TABLE

Pin No. Symbol

Description

1

GND Ground Terminal

2

VOUT Regulated Voltage Output

3

VIN Unregulated Supply Input

3.1 Ground Terminal (GND)

Regulator ground. Tie GND to the negative side of the

output and the negative side of the input capacitor.

Only the LDO bias current (1 µA typical) flows out of

this pin, there is no high current. The LDO output regu-

lation is referenced to this pin. Minimize voltage drops

between this pin and the minus side of the load.

3.2 Regulated Voltage Output (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 as 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 Supply Input (VIN)

Connect the input supply voltage and the positive side

of the input capacitor to VIN. The input capacitor should

be physically located as close as is practical to VIN. The

current flow into this pin is equal to the DC load current,

plus the LDO bias current (1 µA typical.)

TC55

4.0 DETAILED DESCRIPTION

The TC55 is a low quiescent current, precision, fixed-

output voltage LDO. Unlike bipolar regulators, the

TC55 supply current does not increase proportionally

with load current.

4.1 Output Capacitor

A minimum of 1 µF output capacitor is required. The

output capacitor should have an effective series resis-

tance (esr) greater than 0.1Ω and less than 5Ω, plus a

resonant frequency above 1 MHz. Larger output

capacitors can be used to improve supply noise rejec-

tion and transient response. Care should be taken

when increasing COUT to ensure that the input imped-

ance is not high enough to cause high input impedance

oscillation.

4.2 Input Capacitor

A 1 µF input capacitor is recommended for most

applications when the input impedance is on the order

of 10Ω. Larger input capacitance may be required for

stability when operating off of a battery input, or if there

is a large distance from the input source to the LDO.

When large values of output capacitance are used, the

input capacitance should be increased to prevent high

source impedance oscillations.

© 2005 Microchip Technology Inc.

DS21435F-page 9

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