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L4954 Datasheet(PDF) 1 Page - STMicroelectronics |
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L4954 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 7 page  L4954 QUAD MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO 4 REGULATORS 10V (40mA); 8.5V (175mA); 5V (650mA); 5V (100mA) STANDBY 10V AND 5V STAND BY REGULATORS ARE LOW DROPOUT OUTPUTS 3 HIGH SIDE DRIVERS: 2A (HSD1), 0.3A (HSD2 & HSD3) NO EXTERNAL CHARGE PUMP CAPACI- TORS ARE REQUIRED STAND BY MODE CONTROLLED BY 3 IN- PUT PINS: EN1 FOR REG1, REG2, REG3 AND HSD1, EN2 FOR HSD2, AND EN3 FOR HSD3 INDIVIDUAL THERMAL SHUTDOWN LOGIC OUTPUTS FOR SUPPLY UNDER- VOLTAGE: (LVWARN, RESET) INDEPENDENT CURRENT LIMITING OVERVOLTAGE SHUTDOWN SHORT CIRCUIT PROTECTION LOAD DUMP PROTECTION AND OVERVOL- TAGE SHUTDOWN DESCRIPTION L4954 is a quad output voltage regulator and a three output high side driver. The IC includes monitoring circuitry to warn the microprocessor of a low voltage condition: the LVWarn, output, sensing the slow dropping of STCAP pins voltage, gives the microprocessor time to store data. A RESET output is generated at REG4’s decay. External protection must be provided for reverse battery protection. June 2000 ® REG1 10V, 40mA VOLTAGE REFERENCE REG2 8.5V, 175mA REG3 5V, 650mA REG4 5V, 100mA VS RESET LVWarn EN1 EN2 10V-REG1 8.5V-REG2 5V-REG3 5V-REG4-STBY EN3 D95AU346 GND STCAP CURRENT LIMIT RESET LVW OUTPUT CONTROL THERMAL SHUTDOWN OVERVOLTAGE PROTECTION HSD1 2.0A HSD2 0.3A HSD3 0.3A HSD1 HSD2 HSD3 BLOCK DIAGRAM ORDERING NUMBER: L4954 Multiwatt15 1/7 |
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