L4938E

L4938E/ED L4938EPD ADVANCED VOLTAGE REGULATOR ENABLE AND SENSE INPUTS (EN, SI) PRO- TECTED AGAINST NEGATIVE TRANSIENTS DOWN TO -5V RESET THRESHOLD ADJUSTABLE FROM 3.8 TO 4.7V EXTREMELY LOW QUIESCENT CURRENT, 65A (LESS THAN 90A) IN STANDBY MODE DIP (12+2+2) SO20 (12+4+4) PowerSO20 OPERATING DC SUPPLY VOLTAGE RANGE 5V - 28V OPERATING TRANSIENT SUPPLY VOLT- AGE UP TO 40V ORDERING NUMBERS: L4938E (DIP) HIGH PRECISION STANDBY OUTPUT VOLT- L4938ED (SO) AGE 5V 1% WITH 100mA CURRENT CA- L4938EPD (PSO) PABILITY OUTPUT 2 VOLTAGE 5V 2% WITH 400mA CURRENT CAPABILITY (ADJ WIRED TO DESCRIPTION V ) OUT2 The L4938E/ED/EPD is a monolithic integrated OUTPUT 2 VOLTAGE ADJUSTABLE BY EX- dual voltage regulator with two very low dropout TERNAL VOLTAGE DIVIDER outputs and additional functions as power-on re- OUTPUT 2 DISABLE FUNCTION FOR set and input voltage sense. It is designed for STANDBY MODE supplying the microcomputer controlled systems especially in automotive applications. PIN CONNECTIONS PR 1 20 SI GND 1 20 GND PR 1 16 SI CT 2 19 VS1 N.C. 2 19 N.C. CT 2 15 VS1 EN 3 18 VS2 OUT2 V 3 18 S2 EN 3 14 VS2 GND 4 17 GND V 4 17 ADJ S1 GND 4 13 GND GND 5 16 GND SI 5 16 OUT1 GND 5 12 GND GND 6 15 GND PR 6 15 SO GND 7 14 GND RES 6 11 N.C. CT 7 14 RESET RES 8 13 N.C. EN 8 13 N.C. SO 7 10 OUT2 SO 9 12 OUT2 N.C. 9 12 N.C. OUT1 8 9 ADJ OUT1 10 11 ADJ GND 10 11 GND D94AT075A D94AT076A L4938EPD DIP (12+2+2) SO (12+4+4) PowerSO20 1/12 February 1999 Obsolete Product(s) - Obsolete Product(s) L4938E - L4938ED - L4938EPD ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V DC Operating Supply Voltage 28 V INDC V Transient Operating Supply Voltage (T < 400ms) -14 to 40 V INTR I Output Current internally limited O V Sense Input Voltage (Voltage Forced) (note 2) -20 to 20 V SI I Sense Input Current (Current Forced) (note 2) 1mA SI V Enable Input Voltage (Voltage Forced) (note 2) -20 to 20 V EN I Sense Input Current (Current Forced) (note 2) 1mA EN V , V Output Voltages -0.3 to 20 V RES SO I , I Output Currents (Output Low) 5 mA RES SO P Power Dissipation at T = 80C (note 3) 875 mW O amb Powerdip 12+2+2 T Storage Temperature -65 to 150 C stg T Operating Junction Temperature -40 to 150 C j T Thermal shutdown junction temperature Output 2 will shut-down 165 C JSD typically at Tj 10K lower than output 1 Note 1: The circuit is ESD protected according to MIL-STD-883C Note 2: Current forced means voltage unlimited but current limited to the specified value Voltage forced means voltage limited to the specified valueswhile the current is not limited 2 Note 3: Typical value soldered on a PC board with 8cm copper ground plane (35mm thick). BLOCK DIAGRAM VS1 OUT1 1.23V REFERENCE REG1 VS2 OUT2 ADJ EN 1.23V REG2 1.23V CT RES PR 1.4V RESET SO SI 1.23V SENSE GND D94AT074A 2/12 Obsolete Product(s) - Obsolete Product(s)