ILE4267 IKSEMICON | Alldatasheet

Document overview

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Technical content

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 V Qrated = 5.0 V. A reset signal is generated for an output voltage V Q of < 4.5 V. The reset delay can be set with an external capacitor. The dev ice 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 com ponents. When the device is tur ned-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 li ne influences. The resonant circuit consisting of lead inductance and input c apacitance 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.

The control amplifier compares a referenc e voltage, which is kept highly accurate by resistance adjustment, to a voltage that is pr oportional 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 reset- delay capacitor is discharged and then the reset output is set Low. As the output voltage increases again, the reset-del ay capacitor is charged with constant current from V Q = 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 l ogic it is simple to implement delayed tum-OFF without external components. Truth Table for Turn-ON/Turn-OFF Logic E2, Inhibit Hold VQ Remarks L X OFF Initial state. Inhibit internally pulled up H X ON Regulator switched on via Inhibit, by ignition for example H L ON Hold clamped active to ground by controller while Inhibit is still high X L ON Previous state remains, even ignition is shut off: self-holding state L L ON Ignition shut off while regulator is in self-holding state L H OFF 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

(top view) Block Diagram

TJ = -40 to 150°C Limit Values Parameter Symbol min. max. Unit Notes Input Voltage Vi -42 42 V - Voltage Vi - 60 V t ≤ 400 ms Current Ii - - - Limited internally Reset Output Voltage VR -0.3 7 V - Current IR - - - Limited internally Reset Delay Voltage Vd -0.3 42 V - Current Id - - - - Output Voltage VQ -0.3 7 V - Current IQ - - - Limited internally Inhibit Voltage VE2 -42 42 V - Current lE2 -5 5 mA t ≤ 400 ms Hold Voltage VE6 -0.3 7 V - Current IE6 - - mA Limited internally GND Current IGND -0.5 - A - Temperatures Junction temperature TJ - 150 °C - Storage temperature Tstg -50 150 °C -

min. max. Unit Notes Input voltage Vi 5.5 40 V see diagram Junction temperature TJ -40 150 °C -

Electrical Characteristics

Vi = 13.5 V; - 40 °C < TJ < 125 °C; VE2 > 4 V (unless specified otherwise) Limit Values Parameter Symbol min. typ. max. Unit Test Condition Output voltage VQ 4.9 5 5.1 V 5 mA ≤ IQ ≤ 400 mA

6 V ≤ Vi ≤ 26 V

Output voltage VQ 4.9 5 5.1 V 5mA ≤ IQ ≤ 150 mA

6 V ≤ Vi ≤ 40 V

Output-current limiting IQ 500 - - mA TJ = 25 °C Current consumption Iq = Ii - IQ Iq — — 50 µA Regulator-OFF Current consumption Iq = Ii - IQ Iq — 1.0 10 mA TJ = 25 °C IC turned off Current consumption Iq = Ii - IQ Iq — 1.3 mA IQ = 5 mA IC turned on Current consumption Iq = Ii - IQ Iq mA IQ = 400 mA Current consumption Iq = Ii - I Iq — mA IQ = 400 mA VI = 5 V Drop voltage VDr - 0.3 0.6 V IQ = 400 mA1) Load regulation ∆VQ - - 50 mV 5 mA ≤. IQ ≤ 400 mA Supply-voltage regulation ∆VQ — 15 25 mV Vi = 6 to 36 V; IQ = 5 mA Supply-voltage rejection SVR — 54 — dB Fr = 100Hz; Vr = 0.5Vpp Longterm stability ∆VQ - 0 - mV 1000 h 1) Drop voltage = VI – VQ (measured when the output voltage VQ has dropped 100 mV from the nominal value obtained at VI = 13.5 V)

Electrical Characteristics (cont’d) Limit Values Parameter Symbol min. typ. max. Unit Test Condition Reset Generator Switching threshold Vn 4.2 4.5 4.8 V - Reset High level - 4.5 - - V Rext = ∞ Saturation voltage VR - 0.1 0.4 V RR = 4.7 kΩ1) Pullup RR - 30 - kΩ - Saturation voltage VD,sat. - 50 100 mV VQ < VRT Charge current Id 8 15 25 µA VD = 1.5V Delay switching threshold Vdt 2.6 3 3.3 V - Delay td - 20 - ms Cd = 100nF Switching threshold Vst - 0.43 - V - Delay tt - 2 - µs Cd = 100nF Inhibit Turn-ON voltage VE2 - 3 4 V IC turned-ON Turn-OFF voltage VE2 2 - - V IC turned-OFF Pulldown RE2 50 100 200 kΩ - Hysteresis ∆VE2 0.2 0.5 0.8 V - Input current IE2 - 35 100 µA VIP2 = 4 V Holding voltage VE6 30 35 40 % Referred to VQ Turn-OFF voltage VE6 60 70 80 % Referred to VQ Pullup RE6 20 50 100 kΩ - Overvoltage Protection Turn-OFF voltage Vi, ov 42 44 46 V - Turn-ON hysteresis ∆Vi, ov 2 - 6 V - 1) The reset output is Low between VQ = 1 V and VRT