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L4954

STMicroelectronics
Part Number L4954
Manufacturer STMicroelectronics
Description QUAD MULTIFUNCTION VOLTAGE REGULATOR
Published Mar 22, 2005
Detailed Description ® L4954 QUAD MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO 4 REGULATORS 10V (40mA); 8.5V (175mA); 5V (650mA); 5V (100m...
Datasheet PDF File L4954 PDF File

L4954
L4954

Overview
® 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 CAPACITORS ARE REQUIRED STAND BY MODE CONTROLLED BY 3 INPUT PINS: EN1 FOR REG1, REG2, REG3 AND HSD1, EN2 FOR HSD2, AND EN3 FOR HSD3 INDIVIDUAL THERMAL SHUTDOWN LOGIC OUTPUTS FOR SUPPLY UNDERVOLTAGE: (LVWARN, RESET) INDEPENDENT CURRENT LIMITING OVERVOLTAGE SHUTDOWN SHORT CIRCUIT PROTECTION LOAD DUMP PROTECTION AND OVERVOLTAGE SHUTDOWN DESCRIPTION L4954 is a quad output voltage regulator and a BLOCK DIAGRAM VS STCAP VOLTAGE REFERENCE Multiwatt15 ORDERING NUMBER: L4954 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 generatedat REG4’s decay.
External protection must be provided for reverse battery protection.
REG1 10V, 40mA 10V-REG1 REG2 8.
5V, 175mA 8.
5V-REG2 CURRENT LIMIT REG3 5V, 650mA 5V-REG3 RESET LVWarn RESET LVW REG4 5V, 100mA 5V-REG4-STBY EN1 OUTPUT CONTROL THERMAL SHUTDOWN OVERVOLTAGE PROTECTION HSD1 2.
0A HSD2 0.
3A HSD3 0.
3A HSD1 EN2 HSD2 EN3 GND HSD3 D95AU346 June 2000 1/7 L4954 ABSOLUTE MAXIMUM RATINGS Symbol VS VS VS,ovs Vin V out Top Tstg Parameter DC Operating Supply Voltage Transient Supply Overvoltages, rise time = 10ms delay time = 115ms Overvoltage Shutdown Input Voltages (EN1, EN2, EN3) Output Voltages (LVWarn, RESET) Operating Temperature Range Storage Temperature Range Value -0.
6 to 26.
5 34 27 -0.
6 to 6.
0 -0.
6 to 6.
0 -40 to 85 -40 to 150 Unit V V V V V °C °C PIN CONNECTION 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 10V REG1 8.
5V REG2 5V REG3 EN3 EN2 EN1 RESET GND LVWarn 5V REG4-STBY ST CAP HSD3-0.
3A HSD2-0.
3A VS HSD1-2A TAB CONNECTED TO PIN 8 D95AU347 THERMAL DATA Symb...


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