l4948 STMicroelectronics, l4948 Datasheet
l4948
Available stocks
Related parts for l4948
l4948 Summary of contents
Page 1
... UNDERVOLTAGE (LVW) THERMAL SHUTDOWN AND LIMITATION (FOLDBACK) REVERSE BATTERY AND LOAD DUMP PROTECTION INHIBIT (ON/OFF) AND RESET FUNCTIONS DESCRIPTION The L4948 is a quad output low drop voltage regulator. All four outputs are low drop: 10V at 300mA ( 400mA ( 600mA ...
Page 2
... L4948 OPERATING CONDITION Symbol V Supply Voltage S I Load Current ABSOLUTE MAXIMUM RATINGS Symbol V Supply Voltage S V Input Voltage (ON/OFF Output Voltage (LVW, Reset Storage Temperature Range stg T Junction Temperature Range j Load Dump (5ms rise, 115ms decay) ...
Page 3
... 480 100 O Ramp V from 14 to 60V in 3-5ms S Hold V at 60V for 10ms S Ramp V from60 to 14V in 3-5ms 7.75 amb all temps 7.60 L4948 = 4mA 0.4mA Typ. Max. Unit 10 10 10.5 V 150 400 mV 600 mV 800 ...
Page 4
... L4948 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter V Rev. Voltage Trans Rev. Voltage . O2 Ripple rejection V Line Regulation O2 V across V range Output Voltage O3 V Line Regulation O3 V Load Regulation O3 I Quiescent Current ( Dropout Voltage Current Limit (Foldback) note Max Bat ...
Page 5
... The L4948 has ”Foldback” on its outputs during current limiting. As the output loading is increasing the current supplied by the L4948 increases until a threshold is reached. When the current limiting threshold is reached, the L4948 output current will start to accrease as the loading is continuoing to increase. The point where the output current stort to decrease is the maximum output current. ...
Page 6
... L4948 FUNCTIONAL DESCRIPTION The L4948 includes a monitoring circuit to warn the microprocessor if a low voltage or no voltage condition is occurring. Between 6.5V and 7.5V on the STCAP pin, the LVW output will go low. This tells the microprocessor to stop executing code and save vital information. The reset output will go low when V drops 0.15V below it’ ...
Page 7
... Below 7V the outputs are ex- pected to stay alive and ready for a return of bat- tery. The L4948 has a st-by mode to keep the micro- processor and memories allive during an ignition off conditions. The ON/OFF input pin in controlled by the microprocessor. An high on the ON/OFF pin places the part in normal mode ...
Page 8
... L4948 mm inch DIM. MIN. TYP. MAX. MIN. TYP 2. 0.039 E 0.49 0.55 0.019 F 0.88 0.95 0.035 G 1.45 1.7 1.95 0.057 0.067 G1 16.75 17 17.25 0.659 0.669 H1 19.6 0.772 H2 20.2 L 21.9 22.2 22.5 0.862 0.874 L1 21.7 22.1 22.5 0.854 0.87 L2 17.4 18.1 0.685 L3 17.25 17.5 17.75 0.679 0.689 L4 10.3 10.7 10.9 0.406 0.421 L7 2.65 2.9 0.104 M 4.25 4.55 4.85 0.167 0.179 M1 4.73 5.08 5.43 0.186 0.200 S 1.9 2.6 0.075 S1 1.9 2.6 0.075 Dia1 3.65 3.85 0.144 8/9 OUTLINE AND MAX. ...
Page 9
... The ST logo is a registered trademark of STMicroelectronics 2000 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com L4948 9/9 ...