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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-263-5-1 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 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 F and an ESR of < 3 .
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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 k. 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 F capacitor, ESR < 3 .
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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
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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 Symbol VI VI II VR IR VD ID VQ IQ IGND Tj Tstg Limit Values min. max. - 42 42 65 V V Unit Notes
t 400 ms internally limited Internally limited
- 0.3 - 0.3 - 1.0 - 0.5 - 50
7 7 16 - 150 150
V V Internally limited V Internally limited A C C - -
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 Limit Values min. max. 6 42 - 40 150 Unit V C K/W K/W K/W - - Notes
Rthja Rthjc Zthjc
- -
65 3 2
TO263 t < 1 ms TO263
Characteristics
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ILE4270
VI = 13.5 V; - 40 C Tj = 125 C (unless otherwise specified) Parameter Output voltage Output voltage Output current limiting Current consumption Iq = II - IQ Current consumption Iq = II - IQ Current consumption Iq = II - IQ Drop voltage Symbol VQ VQ IQmax Iq min. 4.90 4.90 650 - - - - Limit Values typ. max. 5.00 5.10 5.00 850 1 55 70 350 5.10 - 1.5 75 90 700 Unit V V mA mA mA mA mV Test Condition 5 mA IQ 550 mA; 6 V VI 26 V 26 V VI 36 V; IQ 300 mA VQ = 0 V IQ = 5 mA IQ = 550 mA IQ = 550 mA; VI = 5 V IQ = 550 mA1)
Iq
Iq
Vdr
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 Load regulation Supply voltage regulation Power supply Ripple rejection Reset Generator Switching threshold Reset High voltage Reset low voltage Reset low voltage Reset pull-up Lower reset timing threshold Charge current Upper timing threshold Delay time Reset reaction time Overvoltage Protection Turn-Off voltage Symbol VQ VQ PSRR min. - - - 4.5 4.5 - - 18 0.2 8 1.4 - - 42 Limit Values typ. max. 25 50 12 54 4.65 - 60 200 30 0.45 14 1.8 13 - 44 25 - 4.8 - - 400 46 0.8 25 2.3 - 3 46 Unit mV mV dB V V mV mV k V A V ms s V Test Condition IQ = 5 to 550 mA; VI = 6 V VI = 6 to 26 V IQ = 5 mA fr = 100 Hz; Vr = 0.5 VSS - - Rintern = 30 k2); 1.0 V VQ 4.5 V IR = 3 mA, VQ = 4.4 V internally connected to Q VQ < VRT VD = 1.0 V - CD = 100 nF CD = 100 nF -
VRT VROH VROL VROL R VDRL Id VDU td tRR VI, ov
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.
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ILE4270
Test Circuit
Application Circuit
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ILE4270
Time Response
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ILE4270
Package Dimensions P-TO 220-5-12
ILE4270S
ILE4270G
P-TO 263-5-1
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