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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
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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 BLOCK DIAGRAM
Multiwatt 15 ORDERING NUMBER: L4943
5V Stand-by line to allow the µP to store data.
FILTER CAP 11 GEN REF VMEM (3÷7)V 0.5A 10
ST CAP
12
VMEM VMEM_feed VADJ1 VADJ1_feed VADJ2 VADJ2_feed
EN1
1 VADJ1 (3÷11)V 0.5A
7 13
EN2
2
VADJ2 (3÷11)V 0.5A
9 14
VS
5 HSD LOAD DUMP
4
HSD
6 P-GND
3 S-GND
8 TAB
D97AU668B
December 2000
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L4943
ABSOLUTE MAXIMUM RATINGS
Symbol VS IO Vin RESR Ptot Top Tstg Parameter DC Operating Supply Voltage Transient Supply Overvoltage (50ms) Voltage Regulator Output Current Input Voltage (EN1, EN2) Output Capacitor Series Eq. Resistance Power Dissipation (Tcase = 85°C) Operating Temperature Range Storage Temperature Ranges Value -0.6 to 30 50 Internally limited 0 to 6 0.2 to 10 33 -40 to 85 -55 to 150 Unit V V V Ω W °C °C
PIN CONNECTION (t.b.d.)
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
FILTER CAP V2 feed V1 feed ST CAP VMEM VMEM_feed V2 TAB V1 P-GND VS HSD S-GND EN2 EN1
TAB CONNECTED TO PIN 8
D97AU674A
THERMAL DATA
Symbol RTh j-case Parameter Thermal Resistance Junction to Case Value 2 Unit °C/W
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L4943
ELECTRICAL CHARACTERISTICS (Referred to Test & Application Circuit; VS = 14.4V; Tamb = 25°C; unless otherwise specified).
Symbol 5V STAND-BY Vout Mem ∆Vline ∆Vload Vdropout Ilim Iqst-by Output Voltage no load; 1+R1/R2 = 2.4 no load; 1+R1/R2 = 4 no load; 1+R1/R2 = 5.6 no load; 11