L4938E

L4938E/ED L4938EPD ® ADVANCED VOLTAGE REGULATOR ENABLE AND SENSE INPUTS (EN, SI) PROTECTED AGAINST NEGATIVE TRANSIENTS DOWN TO -5V RESET THRESHOLD ADJUSTABLE FROM 3.8 TO 4.7V EXTREMELY LOW QUIESCENT CURRENT, 65µA (LESS THAN 90µA) IN STANDBY MODE OPERATING DC SUPPLY VOLTAGE RANGE 5V - 28V OPERATING TRANSIENT SUPPLY VOLTAGE UP TO 40V HIGH PRECISION STANDBY OUTPUT VOLTAGE 5V ± 1% WITH 100mA CURRENT CAPABILITY OUTPUT 2 VOLTAGE 5V ± 2% WITH 400mA CURRENT CAPABILITY (ADJ WIRED TO VOUT2) OUTPUT 2 VOLTAGE ADJUSTABLE BY EXTERNAL VOLTAGE DIVIDER OUTPUT 2 DISABLE FUNCTION FOR STANDBY MODE ) s ( ct PIN CONNECTIONS PR r P e 1 16 t e l o CT u d o 2 SI DIP (12+2+2) SO20 (12+4+4) PowerSO20 c u d ) s t( ORDERING NUMBERS: L4938E (DIP) L4938ED (SO) L4938EPD (PSO) o r P DESCRIPTION The L4938E/ED/EPD is a monolithic integrated dual voltage regulator with two very low dropout outputs and additional functions as power-on reset and input voltage sense. It is designed for supplying the microcomputer controlled systems especially in automotive applications. e t le o s b O - PR 1 20 SI CT 2 19 VS1 GND 1 20 GND N.C. 2 19 N.C. OUT2 15 VS1 EN 3 18 VS2 3 18 14 VS2 VS2 GND 4 17 GND VS1 4 17 ADJ 4 13 GND GND 5 16 GND SI 5 16 OUT1 5 12 GND GND 6 15 GND PR 6 15 SO 6 11 N.C. GND 7 14 GND CT 7 14 RESET SO 7 10 OUT2 RES 8 13 N.C. EN 8 13 N.C. OUT1 8 9 SO 9 12 OUT2 N.C. 9 12 N.C. 11 ADJ GND 10 11 GND EN GND bs GND O RES 3 D94AT075A ADJ OUT1 10 D94AT076A DIP (12+2+2) February 1999 SO (12+4+4) L4938EPD PowerSO20 1/12 L4938E - L4938ED - L4938EPD ABSOLUTE MAXIMUM RATINGS Symbol VINDC VINTR IO VSI ISI VEN IEN VRES , VSO IRES , ISO PO Tstg Tj TJSD Parameter DC Operating Supply Voltage Transient Operating Supply Voltage (T < 400ms) Output Current Sense Input Voltage (Voltage Forced) (note 2) Sense Input Current (Current Forced) (note 2) Enable Input Voltage (Voltage Forced) (note 2) Sense Input Current (Current Forced) (note 2) Output Voltages Output Currents (Output Low) Power Dissipation at Tamb = 80°C (note 3) Powerdip 12+2+2 Storage Temperature Operating Junction Temperature Thermal shutdown junction temperature Output 2 will shut-down typically at Tj 10K lower than output 1 Value 28 -14 to 40 internally limited -20 to 20 ±1 -20 to 20 ±1 -0.3 to 20 5 875 Unit V V -65 to 150 -40 to 150 165 °C °C °C 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 Note 3: Typical value soldered on a PC board with 8cm 2 copper ground plane (35mm thick). BLOCK DIAGRAM e t le c u d b O - 1.23V ) s ( ct REG1 VS2 u d o EN r P e OUT1 REFERENCE OUT2 ADJ 1.23V REG2 t e l o 1.23V s b O ) s t( o r P so VS1 V mA V mA V mA mW CT RES PR 1.4V RESET SO SI 1.23V SENSE GND D94AT074A 2/12 L4938E - L4938ED - L4938EPD THERMAL DATA Symbol Parameter DIP 12+2+2 SO 12+4+4 PowerSO20 Rth j-amb Thermal Resistance Junction to ambient Rth j-case Thermal Resistance Junction to case Unit 40 50 - °C/W - - 1.3V TJ < 85°C; RPR = 0 Enable = LOW; VS = 6 to 28V; I02 = 5 to 400mA IOUT2 = 100mA IOUT2 = 400mA; VS = 4.8V IOUT1 = 5 to 400mA (after regulation setting) V02 = 0.8 to 4.5V IOUT1 = 100mA; IOUT2 = 400mA Min. Typ. Max. Unit 4.9 5 5.1 V 4.8 5 0.1 0.2 5.2 0.2 0.4 25 V V V mV 100 200 65 400 90 mA µA µA 75 4.9 60 450 5.1 V 0.2 0.3 0.3 0.6 50 V V mV 100 650 150 1300 20 mA mA mA 20 mV OUT1, OUT 2 VOLi 1,2 Line Regulation VS = 6 to 28V; IO1 = 1mA, IO2 = 5mA, (after regulation setting) 3/12 L4938E - L4938ED - L4938EPD ELECTRICAL CHARACTERISTICS (Continued) Symbol Parameter Test Condition Min. Typ. Max. Unit 1 V ENABLE INPUT VENL Enable Input Low Voltage (Output 2 Active) -20 VENH VENhyst Enable Input High Voltage 1.4 20 V Enable Hysteresis Enable Input Current Low VEN = 0 20 -20 30 -8 60 -3 mV µA Enable Input Current High VEN = 1.1 to 7V; T J < 130°C; -1 0 1 µA VEN = 1.1 to 7V; TJ = 130 to 150°C; -10 0 10 µA IEN LOW IEN HIGH RESET CIRCUIT RPR = ∞ 4.5 3.65 3.8 3.95 V Reset Theresold Hysteresis Reset Pulse Delay RPR = 0 RPR = ∞ CRES = 47nF; t r ≤ 30µs; (note 5) 30 40 60 60 120 100 mV ms Reset Pulse Delay CRES = 47nF; (note 6) 60 100 140 ms tRR ICT Reset Reaction Time Pull Down Capability of the Discharge circuit CRES = 47nF VOUT1 < VRT 10 3 50 6 150 15 uc µs mA ICT Charge Current Reset Output Low Voltage VOUT1 > VRT R RES = 10KΩ to VOUT1 VOUT1 ≥ 1.5V -1 0.7 µA 0.4 V Reset Output High Leakage current VRES = 5V 1 µA VRT VRTH tRD min tRD nom VRESL VRESH Reset Theresold Voltage (note4) SENSE COMPARATOR VSI VSIT Functional Range Sense Threshold Voltage VSITH VSOL Sense Threshold Hysteresis Sense Output Low Voltage ISOH Sense Output Leakage o r P e c u d ISI HIGH Sense Input Current High ISI LOW Sense Input Current Low t e l o d o r -1.3 P e let o s b O - Falling Edge; TJ