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Technical content

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 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 ca pacitance 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. ILE4270G IL E 4270GD2 P-Т О 263-5-1 IL E 4270GKB P-TO220-5-12 TA = -40° ÷ 125° C for all packages. ILE4270GD2 ILE4270GKB

January, 2011, Rev. 01 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.

January, 2011, Rev. 01 Circuit Description The control amplifier compares a reference voltage, whic h 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

January, 2011, Rev. 01 Absolute Maximum Ratings Tj = – 40 to 150 °C Parameter Symbol Limit Values Unit Notes min. max. Input Voltage Voltage Current VI VI II – 42 V V t ≤ 400 ms internally limited Reset Output Voltage Current VR IR – 0.3 V Internally limited Reset Delay Voltage Current VD ID – 0.3 V Internally limited Output Voltage Current VQ IQ – 1.0 16 V Internally limited Ground Current IGND – 0.5 – A – Temperatures Junction temperature Storage temperature Tj Tstg – 50 150 150 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. * Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Operating Range Parameter Symbol Limit Values Unit Notes min. max. Input voltage VI 6 42 V – Junction temperature Tj – 40 150 °C – Thermal Resistance Junction ambient Rthja – 65 K/W TO263 Junction case Rthjc Zthjc – 3 K/W K/W t < 1 ms TO263

January, 2011, Rev. 01 Characteristics VI = 13.5 V; – 40 °C ≤ Tj = ≤ 125 °C (unless otherwise specified) Parameter Symbol Limit Values Unit Test Condition min. typ. max. Output voltage VQ 4.90 5.00 5.10 V 5 mA ≤ IQ ≤ 550 mA;

6 V ≤ VI ≤ 26 V

Output voltage VQ 4.90 5.00 5.10 V 26 V ≤ VI ≤ 36 V; IQ ≤ 300 mA Output current limiting IQmax 650 850 – mA VQ = 0 V Current consumption Iq = II − IQ Iq – 1 1.5 mA IQ = 5 mA Current consumption Iq = II – IQ Iq – 55 75 mA IQ = 550 mA Current consumption Iq = II – IQ Iq – 70 90 mA IQ = 550 mA; VI = 5 V Drop voltage Vdr – 350 700 mV IQ = 550 mA1) 1) Drop voltage = VI – VQ (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 Symbol Limit Values Unit Test Condition min. typ. max. Load regulation ∆VQ – 25 50 mV IQ = 5 to 550 mA; VI = 6 V Supply voltage regulation ∆VQ – 12 25 mV VI = 6 to 26 V IQ = 5 mA Power supply Ripple rejection PSRR – 54 – dB fr = 100 Hz; Vr = 0.5 VSS Reset Generator Switching threshold VRT 4.5 4.65 4.8 V – Reset High voltage VROH 4.5 – – V – Reset low voltage VROL – 60 – mV Rintern = 30 kΩ2); 1.0 V ≤ VQ ≤ 4.5 V Reset low voltage VROL – 200 400 mV IR = 3 mA, VQ = 4.4 V Reset pull-up R 18 30 46 kΩ internally connected to Q Lower reset timing threshold VDRL 0.2 0.45 0.8 V VQ < VRT Charge current Id 8 14 25 µA VD = 1.0 V Upper timing threshold VDU 1.4 1.8 2.3 V – Delay time td – 13 – ms CD = 100 nF Reset reaction time tRR – – 3 µs CD = 100 nF Overvoltage Protection Turn-Off voltage VI, ov 42 44 46 V – 1) Drop voltage = VI – VQ (measured when the output voltage has dropped 100 mV from the nominal value

January, 2011, Rev. 01 obtained at 13.5 V input) 2) Reset peak is always lower than 1.0 V. Test Circuit Application Circuit

January, 2011, Rev. 01 Time Response

January, 2011, Rev. 01 Package Dimensions ILE4270GKB P-TO 220-5-12 ILE4270GD2 P-TO 263-5-1