Document
TECHNICAL DATA
5-V Low-Drop Voltage Regulator
ILE4267
ILE 4267 is a 5-V low-drop voltage regulator in a TO220-7 package. It supplies an output current of > 400 mA. The IC is shortcircuit-proof and incorporates temperature protection that disables the IC at overtemperature.
Features
• Output voltage tolerance ≤ ± 2 % • 400 mA output current capability • Low-drop voltage • Very low standby current consumption • Input voltage up to 40 V • Overvoltage protection up to 60 V (≤ 400 ms) • Reset function down to 1 V output voltage • ESD protection up to 2000 V • Adjustable reset time • On/off logic • Overtemperature protection • Reverse polarity protection • Short-circuit proof • 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 VQrated = 5.0 V. A reset signal is generated for an output voltage VQ 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 µA.
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 Ω in series with Ci. The output capacitor is necessary for the stability of the regulating circuit. Stability is guaranteed at values of ≥ 22 µF and an ESR of ≤ 3 Ω within the operating temperature range.
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ILE4267
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 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 resetdelay 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 VQ = 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
L H H X L
Hold
X X L L L
LH
VQ
OFF ON ON ON ON
OFF
Remarks
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 Regulator shut down by releasing of Hold while Inhibit remains Low, final state. No active clamping required by external self-holding circuit (µC) to keep regulator shut off.
Inhibit: E2 Enable function, active High Hold: E6 Hold and release function, active Low
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 kΩ
3
R
Reset Output; open-collector output internally connected to the output via a resistor of 30 kΩ
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 kΩ
7 Q 5-V Output; block to GND with 22-µF capacitor, ESR < 3 Ω
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Pin Configuration (top view)
ILE4267
Block Diagram
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ILE4267
Absolute Maximum Ratings
TJ = -40 to 150°C
Parameter
Input Voltage Voltage Current Reset Output Voltage Current Reset Delay Voltage Current Output Voltage Current Inhibit Voltage Current
Hold Voltage Current GND Current Temperatures Junction temperature Storage temperature
Symbol
Limit Values min. max.
Vi -42 42 Vi - 60 Ii - -
VR -0.3 7 IR - -
Vd -0.3 42 Id - -
VQ -0.3 7 IQ - -
VE2 -42 42 lE2 -5 5
VE6 -0.3 7 IE6 - -
IGND -0.5 -
TJ - 150 Tstg -50 150
Unit
Notes
VV t ≤ 400 ms - Limited internally
V- Limited internally
V--
V- Limited internally
VmA t ≤ 400 ms
VmA Limited internally
A-
°C °C -
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ILE4267
Operating Range
Parameter
Input voltage Junction temperature
Limit Values Symbol
min. max.
Vi 5.5 40
TJ -40 150
Unit
Notes
V see diagram °C -
Electrical Characteristics Vi = 13.5 V; - 40 °C < T.