TECHNICAL DATA
5-V Low-Drop Fixed Voltage Regulator
ILE4270
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 short
circuit protection limits the output current of more than 650 mA.
The device incorporates over voltage protection and
temperature protection that disables the circuit at
unpermissibly high temperatures.
ILE4270G
ILE4270S
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 time
• ESD protection
>
4000 V
ILE 4270G P-ТО263-5-1
ILE 4270S P-TO220-5-12
T
A
= -40° ÷ 125° C for all
packages.
Application Description
The IC regulates an input voltage in the range of 5.5 V
<
VI
<
36 V to
VQnom
= 5.0 V. Up
to 26 V it produces a regulated output current of more than 550 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. A
reset signal is generated for an output voltage of
VQ
<
4.5 V. The delay for power-on reset
can be set externally with a capacitor.
Design Notes for External Components
An input capacitor
CI
is necessary for compensation of line influences. The resonant circuit
consisting of lead inductance and input capacitance can be damped by a resistor of
approx. 1
Ω
in series with
CI.
An output capacitor
CQ
is necessary for the stability of the
regulating circuit. Stability is guaranteed at values of
CQ
≥
22
µF
and an ESR of
<
3
Ω.
1
ILE4270
Pin Configuration
Pin Definitions and Functions
Pin
Symbol
Function
1
I
Input :
block to ground directly on the IC with ceramic capacitor
2
RO
Reset Output :
the open collector output is connected to the 5 V
output via an integrated resistor of 30 kΩ.
3
GND
Ground :
internally connected to heatsink.
4
D
Reset Delay :
connect a capacitor to ground for delay time
adjustment.
5
Q
5-V Output :
block to ground with 22
µF
capacitor, ESR
<
3
Ω.
2
ILE4270
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 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
CD
on pin 4 (D) will be discharged by the reset generator. If
the voltage on this capacitor drops below
VDRL,
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,
CD
will be charged with
constant current. After the power-on-reset time the voltage on the capacitor reaches
VDU
and the reset output will be set high again. The value of the power-on-reset time can be
set within a wide range depending of the capacitance of
CD.
The IC also incorporates a number of internal circuits for protection against:
• Overload
• Overvoltage
• Overtemperature
• Reverse polarity
Block Diagram
3
ILE4270
Absolute Maximum Ratings
Tj
= – 40 to 150
°C
Parameter
Input
Voltage
Voltage
Current
Reset Output
Voltage
Current
Reset Delay
Voltage
Current
Output
Voltage
Current
Ground
Current
Temperatures
Junction temperature
Storage temperature
Symbol
VI
VI
II
VR
IR
VD
ID
VQ
IQ
IGND
Tj
Tstg
Limit Values
min.
max.
– 42
42
65
V
V
Unit
Notes
t
≤
400 ms
internally limited
Internally limited
– 0.3
– 0.3
– 1.0
– 0.5
– 50
7
7
16
–
150
150
V
V
Internally limited
V
Internally limited
A
°C
°C
–
–
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
Input voltage
Junction temperature
Thermal Resistance
Junction ambient
Junction case
Symbol
VI
Tj
Limit Values
min.
max.
6
42
– 40
150
Unit
V
°C
K/W
K/W
K/W
–
–
Notes
Rthja
Rthjc
Zthjc
–
–
65
3
2
TO263
t
<
1 ms
TO263
Characteristics
4
ILE4270
VI
= 13.5 V; – 40
°C ≤
Tj
=
≤
125
°C
(unless otherwise specified)
Parameter
Output voltage
Output voltage
Output current
limiting
Current
consumption
Iq
=
II
−
IQ
Current
consumption
Iq
=
II
–
IQ
Current
consumption
Iq
=
II
–
IQ
Drop voltage
1)
Drop voltage =
Symbol
VQ
VQ
IQmax
Iq
Limit Values
min.
typ.
max.
4.90
5.00
5.10
4.90
650
–
–
–
–
5.00
850
1
55
70
350
5.10
–
1.5
75
90
700
Unit
V
V
mA
mA
mA
mA
mV
Test Condition
5 mA
≤
IQ
≤
550 mA;
6 V
≤
VI
≤
26 V
26 V
≤
VI
≤
36 V;
IQ
≤
300 mA
VQ
= 0 V
IQ
= 5 mA
IQ
= 550 mA
IQ
= 550 mA;
VI
= 5 V
IQ
= 550 mA1)
Iq
Iq
Vdr
V
I
–
V
Q
(measured when the output voltage has dropped 100 mV from the nominal value
obtained at 13.5 V input)
Characteristics
(cont’d)
VI
= 13.5 V; – 40
°C ≤
Tj
=
≤
125
°C
(unless otherwise specified)
Parameter
Load regulation
Supply voltage
regulation
Power supply
Ripple rejection
Reset Generator
Switching threshold
Reset High voltage
Reset low voltage
Reset low voltage
Reset pull-up
Lower reset timing
threshold
Charge current
Upper timing
threshold
Delay time
Reset reaction time
Overvoltage Protection
Turn-Off voltage
1)
Drop voltage =
Symbol
∆VQ
∆VQ
PSRR
Limit Values
min.
typ.
max.
–
25
50
–
–
4.5
4.5
–
–
18
0.2
8
1.4
–
–
42
12
54
4.65
–
60
200
30
0.45
14
1.8
13
–
44
25
–
4.8
–
–
400
46
0.8
25
2.3
–
3
46
Unit
mV
mV
dB
V
V
mV
mV
kΩ
V
µA
V
ms
µs
V
Test Condition
IQ
= 5 to 550 mA;
VI
= 6 V
VI
= 6 to 26 V
IQ
= 5 mA
fr
= 100 Hz;
Vr
= 0.5
VSS
–
–
Rintern
= 30 kΩ2);
1.0 V
≤
VQ
≤
4.5 V
IR
= 3 mA,
VQ
= 4.4 V
internally connected
to Q
VQ
<
VRT
VD
= 1.0 V
–
CD
= 100 nF
CD
= 100 nF
–
VRT
VROH
VROL
VROL
R
VDRL
Id
VDU
td
tRR
VI,
ov
V
I
–
V
Q
(measured when the output voltage has dropped 100 mV from the nominal value
obtained at 13.5 V input)
2)
Reset peak is always lower than 1.0 V.
5
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