Siemens TLE 4271 Technical data

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5-V Low-Drop Fixed Voltage Regulator TLE 4271

Features

• Output voltage tolerance ≤ ± 2%

• Low-drop voltage

• Integrated overtemperature protection

• Reverse polarity protection

• Input voltage up to 42 V

• Overvoltage protection up to 65 V (≤ 400 ms)

• Short-circuit proof

• Suitable for use in automotive electronics

• Wide temperature range

• Adjustable reset and watchdog time

P-TO220-7-11 (P-TO220-7-1)

Type Ordering Code Package

TLE 4271 Q67000-A9210-A901 P-TO220-7-11 TLE 4271 S Q67000-A9244-A901 P-TO220-7-12

P-TO220-7-12 (P-TO220-7-2)

TLE 4271 G Q67006-A9195-A901 P-TO263-7-1

▼ TLE 4271 Q67000-A9210-C801 P-TO220-7-1 ▼ TLE 4271 S Q67000-A9244-A801 P-TO220-7-2

TLE 4271 G Q67006-A9195-A801 P-TO220-7-8

▼

▼ Not for new design

P-TO263-7-1 (P-TO220-7-8)

Functional Description

This device is a 5-V low-drop fixed-voltage regulator. The maximum input voltage is 42 V (65 V, ≤ 400 ms). Up to an input voltage of 26 V and for an output current up to 550 mA it regulates the output voltage within a 2 % accuracy. The s hort circuit pro tection limits the output current of more than 650 mA. The IC can be switched off via the inhibit input. An integrated watchdog monitors the connected controller. The device incorporates overvoltage protection and temperature protection that disables the circuit at unpermissibly high temperatures.

Semiconductor Group 1 1998-11-01

Pin Configuration

AEP01939

GNDINH

ROWD

(top view)

TLE 4271

P-TO220-7-11

(P-TO220-7-1)

P-TO220-7-12

(P-TO220-7-2)

GNDINH

AEP02017

P-TO263-7-1

(P-TO220-7-8)

INHROGND

AEP01938

Figure 1

Pin Definitions and Functions Pin Symbol Function

1 I Input; block to ground directly on the IC with ceramic capacitor. 2INH Inhibit 3RO Reset Output; the open collector output is connected to the 5 V output

via an integrated resistor of 30 kΩ. 4GNDGround 5D Reset Delay; connect a capacitor to ground for delay time adjustment. 6W Watchdog Input 7Q 5-V Output; block to ground with 22 µF capacitor, ESR < 3 Ω.

Semiconductor Group 2 1998-11-01

TLE 4271

Application Description

The IC regulates an input voltage in the range of 5 .5 V <

< 36 V to V

to 26 V it produces a regulated output current of more than 55 0 mA. Above 26 V the save-operating-area protection allows operation up to 36 V with a regulated output current of more than 300 mA. Overvoltage protection limits operation at 42 V. The overvoltage protection hysteresis restores operation if the input voltage has dropped below 36 V. The IC can be switched off via the inhibit input, which causes the quiescent current to drop below 50 µA. A reset signal is generated for an output voltage of

< 4.5 V. The watchdog circuit monitors a connected controller. If there is no positive-

going edge at the watchdog input wit hin a fixed time, the reset output is set to low. The delay for power-on reset and the maximum permitted watchdog-pulse period can be set externally with a capacitor.

Design Notes for External Components

= 5.0 V. Up

Qnom

An input capacitor

is necessary for compensation of lin e influences. The resonant

circuit consisting of lead inductance and input capacitance can be damped by a resistor

of approx. 1 Ω in series with the regulating circuit. Stability is guaranteed at values of

. An output capacitor CQ is necessary for the stability of

≥ 22 µF and an ESR of

<3Ω.

Circuit Description

The control amplifier compares a reference voltage, which is kept highly accurate by resistance adjustment, to a volt age that is proportion al to the output voltag e and drives the base of a series transistor via a buffer. Saturation control as a function of the load current prevents any over-saturation of the power element.

If the output voltage decreases below 4.5 V, an external capacitor discharged by the res et gene rator. If the voltage on th is capacitor

on pin 4 (D) will be

drops below V

DRL

a reset signal is generated on pin 2 (RO), i.e. reset output is set low. If the output voltage

rises above 4.5 V,

reaches VDU and the reset output w ill be set high again . The value of the power-on-

reset time can be set within a wide range depending on the capacity of

will be charged with constant current. After the power-on-reset time

. The value of

the pull-up resistor at reset output is typically 30 kΩ.

After enabled and discharges observed at watchdog input, low and the watchdog c ircuit will b e disabled. power-on reset until

If a watchdog pulse will be observed before circuit will be enabled and

has reached the voltage VDU and reset was set to high, the watchd og circuit is

with a constant current. If there is no positiv e-going edge

will be discharged down t o V

will be charged with the current as at

reaches VDU and reset will be set high again.

is discharged down to V

will be charged too, b ut reset will n ot be se t low. After V

. Then reset will be set

DWL

, the watchdog

DWL

has reached VDU, the periodical behavior starts again.

Semiconductor Group 3 1998-11-01

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

• Overload

• Overvoltage

• Overtemperature

• Reverse polarity

TLE 4271

Adjustment

Temperature

Sensor

Control

Amplifier

Bandgap

Reference

INH GND

Buffer

Saturation

Control and

Protection

Circuit

Reset

Generator

Watchdog

AEB01940

Figure 2 Block Diagram

Semiconductor Group 4 1998-11-01

Absolute Maximum Ratings

= – 40 to 150 °C

Parameter Symbol Limit Values Unit Notes

min. max.

Input

TLE 4271

Voltage Voltage Current

Inhibit

Voltage Voltage Current

Reset Output

Voltage Current

Reset Delay

Voltage Current

V V I

V I

I I

E E

– 42 – –

– 0.3 –

– 0.3 – 5

42 65 –

42 –

7 5

V V mA

V mA

–

t ≤ 400 ms

internally limited

–

t ≤ 400 ms

internally limited

– internally limited

– –

Watchdog

Voltage Current

V I

– 0.3 – 5

7 5

V mA

– –

Output

Voltage Current

V I

– 1.0 – 5

16 –

V mA

– internally limited

Ground

Current

GND

– 0.5 – A –

Temperat ures

Junction temperature Storage temperature

Semiconductor Group 5 1998-11-01

stg

– – 50

150 150

°C °C

– –

TLE 4271

Optimum reliability and life time are guaranteed if the junction temperature does not exceed 125 °C in operating mode. Operation at up to the maximum junction temperature of 150 °C is possible in principle. Note, however, that operation at the maximum permitted ratings could affect the reliability of the device.

Operating Range

Parameter Symbol Limit Values Unit Notes

min. max.

Input voltage

Junction temperature

Thermal Resistance

Junction ambient

Junction case

V T

thja

thjc

640V–

– 40 150 °C–

–6570K/W

K/W–SMD version

– – –

3 6 2

K/W K/W K/W

– P-TO220-7-8

t < 1ms

Semiconductor Group 6 1998-11-01

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