L4943

L4943 ® MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO 3 PROGRAMMABLE OUTPUTS: 3 TO 11V (500mA); 3 TO 11V (500mA); 3 TO 7V (500mA) STANDBY OUT1 AND OUT2 WITH INDEPENDENT ENABLE CONTROL FOR STAND-BY MODE 0.4A HIGH SIDE DRIVER LOAD DUMP PROTECTION THERMAL SHUTDOWN ♦ ♦ ♦ DESCRIPTION The L4943 contains a triple voltage regulator and a high side driver. In stand-by the output is active as long as possible even when in thermal shutdown or under any other fault conditions. The STCAP pin allows the use of a reserve supply capacitor that will hold enough energy for the ) (s BLOCK DIAGRAM t c u d o r P e t e l o ST CAP bs EN1 12 ) s ( ct u d o r P e t e l o ORDERING NUMBER: L4943 s b O 5V Stand-by line to allow the µP to store data. FILTER CAP 11 GEN VMEM (3÷7)V 0.5A REF 1 VS 2 VADJ2 (3÷11)V 0.5A 5 HSD LOAD DUMP December 2000 10 7 VADJ1 (3÷11)V 0.5A O EN2 Multiwatt 15 6 3 8 P-GND S-GND TAB 13 9 14 4 VMEM VMEM_feed VADJ1 VADJ1_feed VADJ2 VADJ2_feed HSD D97AU668B 1/6 L4943 ABSOLUTE MAXIMUM RATINGS Symbol VS IO Vin RESR Ptot Top Tstg Parameter Value DC Operating Supply Voltage Transient Supply Overvoltage (50ms) Voltage Regulator Output Current Unit -0.6 to 30 V 50 Internally limited V Input Voltage (EN1, EN2) 0 to 6 V Output Capacitor Series Eq. Resistance Power Dissipation (Tcase = 85°C) 0.2 to 10 33 Ω W Operating Temperature Range -40 to 85 °C Storage Temperature Ranges -55 to 150 °C ) s ( ct PIN CONNECTION (t.b.d.) r P e V2 feed 14 13 t e l o 12 11 bs 10 9 -O 8 ) s ( ct du e t e ol s b O o r P TAB CONNECTED TO PIN 8 u d o FILTER CAP 15 V1 feed ST CAP VMEM VMEM_feed V2 TAB 7 V1 6 P-GND 5 VS 4 HSD 3 S-GND 2 EN2 1 EN1 D97AU674A THERMAL DATA 2/6 Symbol Parameter RTh j-case Thermal Resistance Junction to Case Value Unit 2 °C/W L4943 ELECTRICAL CHARACTERISTICS (Referred to Test & Application Circuit; VS = 14.4V; Tamb = 25°C; unless otherwise specified). Symbol Parameter Test Condition Min. Typ. Max. Unit 2.85 4.75 6.65 3 5 7 3.15 5.25 7.35 V V V 5V STAND-BY Vout Mem Output Voltage no load; 1+R1/R2 = 2.4 no load; 1+R1/R2 = 4 no load; 1+R1/R2 = 5.6 ∆Vline Line Regulation no load; 11