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 TA = -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 saveoperating-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 Limit Values min. max. Symbol Unit 42 65 V V 7 V Notes VI VI II – 42 VR IR – 0.3 VD ID – 0.3 VQ IQ – 1.0 IGND – 0.5 – A – Tj Tstg 150 150 °C °C – – 50 t ≤ 400 ms internally limited Internally limited 7 V Internally limited 16 V Internally limited 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 Rthja Rthjc Zthjc Limit Values min. max. 6 42 – 40 150 – – 65 3 2 Unit Notes V °C – – K/W K/W K/W TO263 t < 1 ms TO263 Characteristics 4 ILE4270 VI = 13.5 V; – 40 °C ≤ Tj = ≤ 125 °C (unless otherwise specified) Parameter Symbol Limit Values typ. max. 5.00 5.10 Unit Test Condition Output voltage VQ min. 4.90 Output voltage VQ 4.90 5.00 5.10 V Output current limiting Current consumption Iq = II − IQ Current consumption Iq = II – IQ Current consumption Iq = II – IQ Drop voltage IQmax 650 850 – mA 5 mA ≤ IQ ≤ 550 mA; 6 V ≤ VI ≤ 26 V 26 V ≤ VI ≤ 36 V; IQ ≤ 300 mA VQ = 0 V Iq – 1 1.5 mA IQ = 5 mA Iq – 55 75 mA IQ = 550 mA Iq – 70 90 mA IQ = 550 mA; VI = 5 V Vdr – 350 700 mV IQ = 550 mA1) V 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 typ. max. 25 50 Unit Test Condition Load regulation ∆VQ min. – Supply voltage regulation Power supply Ripple rejection Reset Generator Switching threshold Reset High voltage Reset low voltage ∆VQ – 12 25 mV PSRR – 54 – dB VRT VROH VROL 4.5 4.5 – 4.65 – 60 4.8 – – V V mV Reset low voltage Reset pull-up VROL R – 18 200 30 400 46 mV kΩ Lower reset timing threshold Charge current Upper timing threshold Delay time Reset reaction time Overvoltage Protection Turn-Off voltage VDRL 0.2 0.45 0.8 V – – Rintern = 30 kΩ2); 1.0 V ≤ VQ ≤ 4.5 V IR = 3 mA, VQ = 4.4 V internally connected to Q VQ < VRT Id VDU 8 1.4 14 1.8 25 2.3 µA V VD = 1.0 V – td tRR – – 13 – – 3 ms µs CD = 100 nF CD = 100 nF VI, ov 42 44 46 V – mV IQ = 5 to 550 mA; VI = 6 V VI = 6 to 26 V IQ = 5 mA fr = 100 Hz; Vr = 0.5 VSS 1) Drop voltage = VI – VQ (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 ILE4270 Test Circuit Application Circuit 6 ILE4270 Time Response 7 ILE4270 ILE4270S ILE4270G Package Dimensions P-TO 220-5-12 P-TO 263-5-1 8