TLE4276-2 datasheet(2/16 Pages) INFINEON

2 / 16 page

Data Sheet

Rev. 1.1, 2007-09-21

TLE 4276-2

Functional Description

The TLE 4276-2 is a low-drop voltage regulator in a TO package. The IC regulates an

input voltage up to 40 V to

Q,nom = 5.0 V (V50) or adjustable voltage (V). The maximum

output current is 400 mA. The IC can be switched off via the inhibit input, which causes

the current consumption to drop below 10

µA. The IC is short-circuit-proof and includes

temperature protection which turns off the device at overtemperature.

Dimensioning Information on External Components

The input capacitor

I is necessary for compensation of line influences. Using a resistor

of approx. 1

Ω in series with C

I, the oscillating of input inductivity and input capacitance

can be damped. The output capacitor

Q is necessary for the stability of the regulation

circuit. Stability is guaranteed at values

Q ≥ 22 µF and an ESR of ≤ 3 Ω within the

operating temperature range.

Circuit Description

The control amplifier compares a reference voltage to a voltage that is proportional to the

output voltage and drives the base of the series transistor via a buffer. Saturation control

as a function of the load current prevents any oversaturation of the power element. The

IC also incorporates a number of internal circuits for protection against:

•

Overload

•

Overtemperature

•

Reverse polarity

TLE4276-2 Datasheet(PDF) 2 Page - Infineon Technologies AG