TC1014-4.0VCT 데이터 시트보기 (PDF) - Microchip Technology

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TC1014-4.0VCT

50 mA, 100 mA and 150 mA CMOS LDOs with Shutdown and Reference Bypass

Microchip Technology 

TC1014/TC1015/TC1185

4.0 DETAILED DESCRIPTION

The TC1014, TC1015 and TC1185 are precision fixed

output voltage regulators (if an adjustable version is

needed, see the TC1070, TC1071 and TC1187 data

sheet (DS21353). Unlike bipolar regulators, the

TC1014, TC1015 and TC1185 supply current does not

increase with load current. In addition, the LDOs’ out-

put voltage is stable using 1 µF of capacitance over the

entire specified input voltage range and output current

range.

Figure 4-1 shows a typical application circuit. The

regulator is enabled anytime the shutdown input

(SHDN) is at or above VIH, and 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, the supply current

decreases to 0.05 µA (typical) and VOUT falls to zero

volts.

+

VIN

VOUT

+

1 µF TC1014

TC1015

Battery

TC1185

GND

VOUT

+

1 µF

SHDN Bypass

Shutdown Control

(to CMOS Logic or Tie

to VIN if unused)

470 pF

Reference

Bypass Cap

(Optional)

FIGURE 4-1:

Typical Application Circuit.

4.1 Bypass Input

A 470 pF capacitor connected from the Bypass input to

ground reduces noise present on 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.

4.2 Output Capacitor

A 1 µF (min) capacitor from VOUT to ground is required.

The output capacitor should have an effective series

resistance greater than 0.1Ω and less than 5Ω. 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 can be improved by increasing the

value of the input and output capacitors and employing

passive filtering techniques.

4.3 Input Capacitor

A 1 µF capacitor should be connected from VIN to GND

if there is more than 10 inches of wire between the

regulator and this AC filter capacitor, or if a battery is

used as the power source. Aluminum electrolytic or

tantalum capacitors can be used (since many

aluminum electrolytic capacitors freeze at

approximately -30°C, solid tantalum is 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.

DS21335E-page 12

© 2007 Microchip Technology Inc.

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