ILE4267

5-V Low-Drop Voltage Regulator

Functional Description

ILE 4267 is a 5-V low-drop voltage regulator. It
supplies an output current of > 400 mA. The IC is
shortcircuit-proof and incorporates temperature
protection that disables the 1C at overtemperature
Features

ž Output voltage tolerance ˜ 2 %
ž 400 mA output current capability

ž Low-drop voltage

ž Very low standby current consumption

ž Input voltage up to 40 V

ž Overvoltage protection up to 60 V (˜ 400 ms)
ž Reset function down to 1 V output voltage

ž ESD protection up to 2000 V

ž Adjustable reset time

ž On/off logic

ž Overtemperature protection

ž Reverse polarity protection

ž Short-circuit proof

ž Wide temperature range

Suitable for use in automotive electronics

Application

The IC regulates an input voltage V, in the range 5.5 V < Vi < 40 V to V

Qrated

= 5.0 V. A

reset signal is generated for an output voltage V

of < 4.5 V. The reset delay can be set

with an external capacitor. The device has two logic inputs. It is turned-ON by a voltage of

> 4 V on E2 by the ignition for example. It remains active as a function of the voltage on

E6, even if the voltage on E2 goes Low. This makes it possible to implement a self-holding

circuit without external components. When the device is turned-OFF, the output voltage
drops to 0 V and current consumption tends towards 0

Design Notes for External Components

The input capacitor Ci

is necessary for compensation line influences. The resonant circuit

consisting of lead inductance and input capacitance can be damped by a resistor of approx. 1

series with Ci. The output capacitor is necessary for the stability of the regulating circuit. Stability is
guaranteed at values of

™ 22 F and an ESR of ˜ 3 within the operating temperature range.

Circuit Description

The control amplifier compares a reference voltage, which is kept highly accurate by resistance

adjustment, to a voltage that is proportional to the output voltage and drives the base of

ILE4267

the series transistor via a buffer. Saturation control as a function of the load current

prevents any over-saturating of the power element.
A comparator in the reset-generator block compares a reference that is independent of the

input voltage to the scaled-down output voltage. If this reaches a value of 4.5 V, the reset-

delay capacitor is discharged and then the reset output is set Low. As the output voltage

increases again, the reset-delay capacitor is charged with constant current from V

= 4.5

V onwards. When the capacitor voltage reaches the upper switching threshold, reset goes

High again. The reset delay can be set within wide range by selection of the external

capacitor.
With the integrated tum-ON/tum-OFF logic it is simple to implement delayed tum-OFF

without external components.

Truth Table for Turn-ON/Turn-OFF Logic

E2, Inhibit

Hold

Remarks

OFF

Initial state. Inhibit internally pulled up

Regulator switched on via Inhibit, by ignition for example

Hold clamped active to ground by controller while Inhibit is still high

Previous state remains, even ignition is shut off: self-holding state

Ignition shut off while regulator is in self-holding state

OFF

Regulator shut down by releasing of Hold while Inhibit remains Low,
final state. No active clamping required by external self-holding
circuit (

C) to keep regulator shut off.

Inhibit: E2 Enable function, active High
Hold: E6 Hold and release function, active Low

ILE4267

Pin Definitions and Functions

Pin Symbol

Function

1 I

Input; block to ground directly at the IC by a ceramic capacitor

2 E2 Inhibit; device is turned-ON by High signal on this pin; internal pulldown

resistor of 100 k

3 R Reset Output; open-collector output internally connected to the output

via a resistor of 30 k

4 GND

Ground; connected to rear of chip

5 D Reset Delay; connect with capacitor to GND for setting delay
6 E6 Hold; see truth table above for function; this input is connected to output

voltage across puliup resistor of 50 k

7 Q 5-V Output; block to GND with 22-

F capacitor, ESR < 3

Block Diagram

ILE4267

Absolute Maximum Ratings

= -40 to 150œC

Limit Values

Parameter

Symbol

min. max.

Unit

Notes

Input
Voltage Vi

-42

Voltage Vi

˜ 400 ms

Current Ii

Limited

internally

Reset Output
Voltage V

-0.3

7 V

Current I

- - -

Limited

internally

Reset Delay
Voltage Vd

-0.3

Current Id

Output
Voltage V

-0.3

7 V

Current I

- - -

Limited

internally

Inhibit
Voltage V

-42

42 V

Current l

-5 5 mA

˜ 400 ms

Hold
Voltage V

-0.3 7

Current I

mA Limited

internally

GND
Current I

GND

-0.5 -

Temperatures
Junction temperature

150 œC -

Storage temperature

Tstg

-50

150

œC

Operating Range

Limit Values

Parameter

Symbol

min. max.

Unit

Notes

Input voltage

5.5

see diagram

Junction temperature

-40 150

œC

Thermal Resistance
Junction ambient

K/W

P-T0220-7-3 package

Junction-case Rthjc

K/W

P-T0220-7-3

package

Junction-case

Zthjc

K/W

T< 1 ms
P-T0220-7-3 package

Junction ambient

Rthja

K/W

P-T0220-7-180 (SMD) package

Junction-case

Rthjc

K/W

P-T0220-7-180 (SMD) package

Junction-case

Zthjc

K/W

T<1 ms
P-T0220-7-180 (SMD) package

Junction ambient

Rthja

K/W

P-T0220-7-230 package

Junction-case Rthjc

K/W

P-T0220-7-230

package

Junction-case

Zthjc

K/W

T< 1 ms
P-T0220-7-230 package

Junction ambient

Rthja

K/W

P-DSO-14-8 package

Junction-pin Rthjc

K/W

P-DSO-14-8

package

Characteristics
Vi = 13.5 V; - 40 œC < T

< 125 œC; V

> 4 V (unless specified otherwise)

Parameter

Symbol

Limit Values

Unit

Test Condition

ILE4267

min. typ. max.

Output voltage

4.9

5 5.1

V 5 mA

˜ I

˜ 400 mA 6 V

˜ Vi ˜ 26 V

Output voltage

4.9

5 5.1

V 5mA

˜ I

˜ 150 mA

6 V

˜ Vi ˜ 40 V

Output-current limiting

500 -

mA T

= 25 œC