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| 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 * * * * * * * * * * * * * * * 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 A. 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 in 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 1 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 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 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 (C) to keep regulator shut off. Inhibit: E2 Enable function, active High Hold: E6 Hold and release function, active Low E2, Inhibit L H H X L L Hold X X L L L H VQ OFF ON ON ON ON OFF 2 ILE4267 Pin Definitions and Functions Pin 1 2 3 4 5 6 7 Symbol I E2 R GND D E6 Q Function Input; block to ground directly at the IC by a ceramic capacitor Inhibit; device is turned-ON by High signal on this pin; internal pulldown resistor of 100 k Reset Output; open-collector output internally connected to the output via a resistor of 30 k Ground; connected to rear of chip Reset Delay; connect with capacitor to GND for setting delay Hold; see truth table above for function; this input is connected to output voltage across puliup resistor of 50 k 5-V Output; block to GND with 22-F capacitor, ESR < 3 Block Diagram 3 ILE4267 Absolute Maximum Ratings TJ = -40 to 150C 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 Operating Range Parameter Input voltage Junction temperature Thermal Resistance Junction ambient Junction-case Junction-case Junction ambient Junction-case Junction-case Junction ambient Junction-case Junction-case Symbol Limit Values min. max. -42 -0.3 -0.3 -0.3 -42 -5 -0.3 -0.5 -50 7 150 150 42 60 7 42 7 42 5 Unit Notes Vi Vi Ii VR IR Vd Id VQ IQ VE2 lE2 VE6 IE6 IGND TJ Tstg V V V V V V mA V mA A C C t 400 ms Limited internally Limited internally Limited internally t 400 ms Limited internally - Symbol Vi TJ Limit Values min. max. 5.5 40 -40 150 65 6 2 70 6 2 65 6 2 Unit V C K/W K/W K/W K/W K/W K/W K/W K/W K/W Notes see diagram P-T0220-7-3 package P-T0220-7-3 package T< 1 ms P-T0220-7-3 package P-T0220-7-180 (SMD) package P-T0220-7-180 (SMD) package T<1 ms P-T0220-7-180 (SMD) package P-T0220-7-230 package P-T0220-7-230 package T< 1 ms P-T0220-7-230 package P-DSO-14-8 package P-DSO-14-8 package Rthjc Zthjc Rthja Rthjc Zthjc Rthja Rthjc Zthjc Junction ambient Rthja 70 K/W Junction-pin Rthjc 30 K/W Characteristics Vi = 13.5 V; - 40 C < TJ < 125 C; VE2 > 4 V (unless specified otherwise) Parameter Symbol Limit Values Unit 4 Test Condition ILE4267 Output voltage Output voltage Output-current limiting Current consumption Iq = Ii - IQ Current consumption Iq = Ii - IQ Current consumption Iq = Ii - IQ Current consumption Iq = Ii - IQ Current consumption Iq = Ii - I Drop voltage Load regulation Supply-voltage regulation Supply-voltage rejection Longterm stability Reset Generator Switching threshold Reset High level Saturation voltage Pullup Saturation voltage Charge current Delay switching threshold Delay Switching threshold Delay Inhibit Turn-ON voltage Turn-OFF voltage Pulldown Hysteresis VQ VQ IQ Iq Iq Iq Iq Iq VDr VQ VQ SVR VQ Vn VR RR VD,sat. Id Vdt td Vst tt VE2 VE2 RE2 VE2 min. 4.9 4.9 500 -- -- -- -- -- -- -- 4.2 4.5 8 2.6 2 50 0.2 typ. 5 5 -- 1.0 1.3 -- -- 0.3 15 54 0 4.5 0.1 30 50 15 3 20 0.43 2 3 100 0.5 max. 5.1 5.1 50 10 4 60 80 0.6 50 25 -- 4.8 0.4 100 25 3.3 4 200 0.8 V V mA A mA mA mA mA V mV mV dB mV V V V k mV A V ms V s V V k V 5 mA IQ 400 mA 6 V Vi 26 V 5mA IQ 150 mA 6 V Vi 40 V TJ = 25 C Regulator-OFF TJ = 25 C IC turned off IQ = 5 mA IC turned on IQ = 400 mA IQ = 400 mA VI = 5 V IQ = 400 mA1' 5 mA . IQ 400 mA Vi = 6 to 36 V; IQ = 5 mA Fr = 100Hz; Vr = 0.5Vpp 1000 h Rext = RR = 4.7 k2) VQ < VRT VD = 1.5V Cd = 100nF Cd = 100nF IC turned-ON IC turned-OFF - Input current IE2 Holding voltage VE6 Turn-OFF voltage VE6 Pullup RE6 Overvoltage Protection Turn-OFF voltage Vi, ov Turn-ON hysteresis Vi, ov 30 60 20 42 2 35 35 70 50 44 - 100 40 80 100 46 6 A % % k V V VIP2 = 4 V Referred to VQ Referred to VQ - 5 ILE4267 Test Circuit Application Circuit 6 ILE4267 Time Response 7 ILE4267 Enable and Hold Behaviour 8 ILE4267 9 ILE4267 10 ILE4267 11 |
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