TC1014 datasheet(6/20 Pages) MICROCHIP

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TC1014/TC1015/TC1185

DS21335B-page 6

3.0

DETAILED DESCRIPTION

The TC1014/TC1015/TC1185

are

precision fixed

output voltage regulators. (If an adjustable version is

desired, please see the TC1070/TC1071/TC1187 data

sheet.) Unlike bipolar regulators, the TC1014/TC1015/

TC1185 supply current does not increase with load

current. In addition, VOUT remains stable and within

regulation over the entire 0mA to IOUTMAX operating

load current ranges (an important consideration in RTC

and CMOS RAM battery back-up applications).

Figure 3-1 shows a typical application circuit. The

regulator is enabled any time the shutdown input

(SHDN)isatorabove VIH, and shutdown (disabled)

when SHDN is at or below VIL. SHDN may be

controlled by a CMOS logic gate, or I/O port of a

microcontroller. If the SHDN input is not required, it

should be connected directly to the input supply. While

in shutdown, supply current decreases to 0.05

µA

(typical), VOUT fallstozerovolts.

FIGURE 3-1:

TYPICAL APPLICATION

CIRCUIT

3.1

Bypass Input

A 470pF capacitor connected from the Bypass input to

ground

reduces

noise

present

the

internal

reference, which in turn significantly reduces output

noise. If output noise is not a concern, this input may be

left unconnected. Larger capacitor values may be

used, but results in a longer time period to rated output

voltage when power is initially applied.

3.2

Output Capacitor

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.A 1µF

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 can be improved by increasing the

value of the input and output capacitors and employing

passive filtering techniques.

TC1014

TC1015

TC1185

VOUT

SHDN

GND

Bypass

470pF

Reference

Bypass Cap

(Optional)

µF

VIN

VOUT

Shutdown Control

(to CMOS Logic or Tie

to VIN if unused)

µF

Battery

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