L487 ETC2
Document overview
- Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 3
Technical content
® S G S No longer manufactured, to purchase see - www.procontechnology.com.au Phone: (03) 98306288 L487 VERY LOW DROP 5V VOLTAGE REGULATOR WITH RESET PRECISE OUTPUT VOLTAG E (5V ± 4% ) VERY LOW DROPOUT VOLTAGE OUTPUT CURRENT IN EXCESS OF 500mA POWER-ON, POWER-OF F INFOR MATION ( RESET FUNCTI ON) +80/ ‒80V LOAD DUMP PROTECTION OVERVOLTAGE AND REVERSE VOLTAG E PROTECTION SHORT CIRCU IT PROTECTION AND THERMAL SHUT-DOWN The L487 is a monolithic integrated circuit in Pentawatt® package specially designed to provide a stabilized supply voltage for automotive and industrial electronic system. Thanks to its very low voltage drop in automotive applications the L487 can work correctly even during the cranking phase, when the battery voltage could fall as low as 6V. Furthermore, it incorporates a complete range of protection circuits against the dangerous overvoltages always present on the battery rail of the car. The reset function makes the device particularly suited to supply microprocessor based systems: a pulse is available (after an externally programmable delay) to reset the microprocessor at power-on phase; at power-off, this pulse becomes low inhibiting the microprocessor. ABSOLUTE MAXIMUM RATINGS Vi Forward input voltage 35 V Vi Reverse input voltage –18 V Positive transient peak voltage (t = 300ms) 80 V Negative transient peak voltage (t = 100ms) –80 V Top Operating junction temperature –40 to 150 ºC Tstg Storage temperature –55 to 150 ºC TEST Cl RCUIT * Min. 33µF and max. ESR ≤3Ω over temperature range Pentawatt® ORDERING NUMBER: L487
® S G S No longer manufactured, to purchase see - www.procontechnology.com.au Phone: (03) 98306288 L487 CONNECTION DIAGRAM (top view) BLOCK DIAGRAM output current output current temperature THERMAL DATA R th j-case Thermal resistance junction-case max 4 °C/W
® S G S No longer manufactured, to purchase see - www.procontechnology.com.au Phone: (03) 98306288 L487
ELECTRICAL CHARACTERISTICS
(Refer to the test circuit, Vi =14.4V, Tamb = 25°C, unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit Vo Output Voltage Io = 5mA to 500mA 4.80 5.00 5.20 V Vi Operating Input Voltage (*) See note 28 V ΔVo Line Regulation Vi = 6V to 26V Io = 5mA 5 50 mV ΔVo Load Regulation I o = 5mA to 500mA 15 60 mV Vi – Vo Dropout Voltage Io = 500mA 0.6 0.8 V Iq Quiescent Current I o = 0mA 6 15 I o = 150mA 20 40 mA I o = 500mA 130 210 Vi = 6.2 V I o = 500mA 250 mA ΔVo ΔT Temperature Output Voltage Drift –0.5 mV/ºC SVR Supply Voltage Rejection Io = 350 mA f = 120 Hz 55 dB C o = 100µF V i = 12V ± 5V pp ISC Output Short Circuit Current 0.8 A VR Reset Output Voltage IR = 1 6 mA V o ≤ 4.75V 0.8 V IR Reset Output Leakage Vo in Regulation 50 µA Current td Delay Time for Reset Output Cd = 100nF 30 ms V RT(off) Reset Threshold (delay 4.75 Vo–0.15 Vo–0.04 V charging current on) IC4 Charging Current 10 27 µA (current generator) V RT(on) Reset Threshold (low) V RT(off) –10m V V V4 Comparator Threshold 3.6 3.95 V (pin 4) * For a DC input voltage 28 < V i < 35V the device is not operating For dimensional information on the Pentawatt package see the L387A data sheet. For more information on this device see the SGS-Thomson Microelectronics Application Note: 'Low Drop Voltage Regulators for Automotive Electronics' by S.Ciscato. This device can be used as a replacement for L387A, L4947, LM2927T, L78MR05 or 4848 (in house part number with 'SGS 88719' printed on it).