L4949ED

® L4949E MULTIFUNCTION VERY LOW DROP VOLTAGE REGULATOR OPERATING DC SUPPLY VOLTAGE RANGE 5V - 28V TRANSIENT SUPPLY VOLTAGE UP TO 40V EXTREMELY LOW QUIESCENT CURRENT IN STANDBY MODE HIGH PRECISION STANDBY OUTPUT VOLTAGE 5V±1% OUTPUT CURRENT CAPABILITY UP TO 100mA VERY LOW DROPOUT VOLTAGE LESS THAN 0.5V RESET CIRCUIT SENSING THE OUTPUT VOLTAGE PROGRAMMABLE RESET PULSE DELAY WITH EXTERNAL CAPACITOR VOLTAGE SENSE COMPARATOR THERMAL SHUTDOWN AND SHORT CIRCUIT PROTECTIONS BLOCK DIAGRAM Minidip SO8 SO20W (12+4+4) ORDERING NUMBERS: L4949E (Minidip) L4949ED (SO8) L4949EP (SO20W) DESCRIPTION The L4949E is a monolithic integrated 5V voltage regulator with a very low dropout output and additional functions as power-on reset and input voltage sense. It is designed for supplying the microcomputer controlled systems especially in automotive applications. VZ VOUT CT VS PREREGULATOR 5V 2µ + RES 2V REG RESET VS SI SO 1.23V REF SENSE 1.23V GND D96AT219 June 2000 1/10 L4949E ABSOLUTE MAXIMUM RATINGS Symbol VSDC VSTR IO VO IRES, ISO VZ IZ TJ Tstg Parameter DC Operating Supply Voltage Transient Supply Voltage (T < 1s) Output Current Output Voltage Output Current Preregulator Output Voltage Preregulator Output Current Junction Temperature Storage Temperature Range Value 28 40 Internally Limited 20 20 5 7 5 -40 to +150 -55 to +150 V V mA V mA °C °C Unit V V VRES, VSO Output Voltage Note: The circuit is ESD protected according to MIL-STD-883C THERMAL DATA Symbol Rth j-amb R th j-pins TJSD Description Thermal Resistance Junction-ambient Thermal Resistance Junction-pins Thermal Shutdown Junction temperature Max Max 165 Minidip 100 SO-8 200 SO20L 50 15 Unit °C/W °C/W °C PIN CONNECTIONS VZ CT N.C. VS SI VZ CT 1 2 3 4 D95AT217 1 2 3 4 5 6 7 8 9 10 D95AT218 20 19 18 17 16 15 14 13 12 11 SI VS N.C. GND GND GND GND N.C. VOUT SO 8 7 6 5 VOUT SO RES GND GND GND GND GND N.C. N.C. RES MINIDIP/SO8 SO20 2/10 L4949E ELECTRICAL CHARACTERISTICS (VS = 14V; -40°C < Tj < 125 °C unless otherwise specified) Symbol VO VO VO VDP Parameter Output Voltage Output Voltage Output Voltage Dropout Voltage Test Condition TJ = 25°C; IO = 1mA 6V < VIN < 28V, 1mA < IO < 50mA VIN = 40V; T < 1s 5mA < IO