TC56 datasheet(3/16 Pages) MICROCHIP

3 / 16 page

 2002 Microchip Technology Inc.

DS21436B-page 3

TC56

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 TC56 is a precision, fixed output LDO. Unlike

bipolar regulations, the TC56 supply current does not

increase with load current.

3.1

Output Capacitor

A 10

µF tantalum capacitor from VOUT to ground is

recommended. The output capacitor should have an

effective series resistance greater than 0.1

Ω and less

than 5.0

Ω, and a resonant frequency above 1MHz. It is

recommended that a 4.7

µF capacitor be connected

from VIN to GND. When operating from sources other

than batteries, supply noise rejection and transient

response can be improved by increasing the value of

the input and output capacitors and employing passive

filtering techniques.

3.2

Shutdown Input

The TC56 enters a low power shutdown mode when

the shutdown control input (SHDN) is low. During

shutdown, the regulator is disabled and supply current

is reduced to 0.1

µA (max). Normal operation is

restored when SHDN is driven high. If not required, the

SHDN input can be tied to VIN.

Pin No.

(5-Pin SOT-23A)

Symbol

Description

1VSS

Ground.

2VIN

Supply voltage input.

3SHDN

Shutdown input.

(NC)

No connection.

5VOUT

Regulated voltage output.

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