1. Voltage regulators are used to provide a stable DC voltage for powering other electronic circuits by regulating the output voltage regardless of changes in the input voltage or load current. 2. There are two main types of voltage regulators - linear regulators which use a series pass transistor operating in the linear region, and switching regulators which provide advantages over linear regulators such as short circuit protection and adjustable output voltage. 3. Characteristics of voltage regulators include a fixed regulated output voltage, a minimum input voltage requirement of at least 2V more than the output voltage, and load current variation from 0 to the maximum rated output current.

1. LINEAR INTEGRATED
CIRCUITS
SUBMITTED BY
PRADEEPA RAJENDRAN
115011013898
BTECH ECE 2ND YR
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2. VOLTAGE REGULATOR
*Introduction
*Series op-AMP Regulator
*Ic Voltage Regulators
*Characteristics
*General Purpose Regulator

3. VOLTAGE REGULATOR
*A Voltage regulator should be
capable of providing
substantial output current.
*The function of a voltage regulator is
to provide a stable dc voltage for
powering other electronic circuits.

4. SERIES OF OP-AMP REGULATOR
Reference voltage
circuit
1
Error amplifier
2
Series pass
transistor and
feedback network
3

5. CHARACTERISTICS
The regulated output voltage is fixed at a value
as specified by the manufacturer.
1
The unregulated input voltages must be
at least 2V more than the regulated output voltage.
2
The load current may vary from 0 to rated maximum output current
.The IC is usually provided with a heat sink.
3
The output current will drop and remains there until the IC has
cooled significantly.
4

6. LINE /INPUT REGULATION
It is defined as the percentage change in the
output voltage for a change in the input voltage.
It is is usually expressed in millivolts or as a
percentage of the output voltage. Typical value
of line regulation from the data sheet of 7805 is
3mV.

7. Many discrete and IC circuits
(such as op-amp) require
bipolar supplies . This can be
easily done with two three
terminal regulators.
DUAL VOLTAGE SUPPLY

8. TYPES OF VOLTAGE
REGULATOR ;
•SERIES REGULATOR
•SWITCHING REGULATOR

9. THE THREE TERMINAL
REGULATORS DISCUSSED EARLIER
HAVE THE FOLLOWING
LIMITATIONS;
1.No short circuit protection
2.Output voltage (positive or
negative )is fixed.

10. SWITCHING REGULATOR
The regulated power supplies
discussed so far are referred
to as linear voltage regulator
, since the series pass
transistor operates in the
linear region .

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