TC1262 datasheet(3/12 Pages) MICROCHIP

Il numero della parte	TC1262

Spiegazioni elettronici	500mA Fixed Output CMOS LDO

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DS21373B-page 3

TC1262

2.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

TABLE 2-1:

PIN FUNCTION TABLE

3.0

DETAILED DESCRIPTION

The TC1262 is a precision, fixed output LDO. Unlike

bipolar regulators, the TC1262’s supply current does

not increase with load current. In addition, VOUT

remains stable and within regulation over the entire

0mA to ILOADMAX load current range (an important

consideration in RTC and CMOS RAM battery back-up

applications).

Figure 3-1 shows a typical application circuit.

FIGURE 3-1:

TYPICAL APPLICATION

CIRCUIT

3.1

Output Capacitor

A1

µF (min) capacitor from VOUT to ground is required.

The output capacitor should have an effective series

resistance greater than 0.1

Ω and less than 5Ω,and a

resonant frequency above 1MHz. A 1

µF capacitor

should be connected from VIN to GND if there is more

than 10 inches of wire between the regulator and the

AC filter capacitor, or if a battery is used as the power

source. Aluminum electrolytic or tantalum capacitor

types can be used. (Since many aluminum electrolytic

capacitors

freeze

at

approximately

-30°C,

solid

tantalums are recommended for applications operating

below -25°C.) When operating from sources other than

batteries,

supply-noise

rejection

and

transient

response canbeimprovedbyincreasingthe valueof

the input and output capacitors and employing passive

filtering techniques.

Pin No.

(3-Pin SOT-223)

(3-Pin TO-220)

(3-Pin DDPAK)

Symbol

Description

1VIN

Unregulated supply input.

2

GND

Ground terminal.

3VOUT

Regulated voltage output.

C1

1

µF

Battery

TC1262

VIN

VOUT

C2

1

µF

GND

VOUT

+

–

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