L4948 QUAD VOLTAGE REGULATOR WITH INHIBIT AND RESET 4 OUTPUTS: 10V (300mA); 8V (400mA); 5V (600mA); 5V (100mA) ALL FOUR OUTPUTS ARE LOW DROP 5V (100mA) ST-BY OUTPUT VOLTAGE EARLY WARNING OUTPUT FOR SUPPLY UNDERVOLTAGE (LVW) THERMAL SHUTDOWN AND CURRENT 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 (VO1), 8V at 400mA (VO2), 5V at 600mA (VO3) and a 5V st-by line at 100mA (VO4). The IC includes a monitoring circuit to warn if a low voltage or no voltage condition is occurring. VO1,2,3 are off during st-by mode. The STCAP pin allows the battery voltage to deBLOCK DIAGRAM June 2000 MULTIPOWER BCD TECHNOLOGY Multiwatt 11 ORDERING NUMBER: L4948 cay slowly giving the µP time to store data. This IC is designed for supplying microcomputer controlled systems specially in automotive applications. 1/9 L4948 OPERATING CONDITION Symbol Parameter Value Unit VS Supply Voltage -15 to 27 V IL Load Current IO1 IO2 IO3 IO4 300 400 600 100 mA mA mA mA Value Unit ABSOLUTE MAXIMUM RATINGS Symbol Parameter VS Supply Voltage VI Input Voltage (ON/OFF) -35 to 60 V 0 to 12 V VO Output Voltage (LVW, Reset) 0 to 12 V Tstg Storage Temperature Range -65 to 150 °C Tj Junction Temperature Range max 150 °C 60 V Value Unit 2 °C/W Load Dump (5ms rise, 115ms decay) PIN CONNECTION APPLICATION CIRCUIT THERMAL DATA Symbol Rth j-case 2/9 Parameter Thermal Resistance Junction-case max L4948 ELECTRICAL CHARACTERISTICS (VS = 10.5 to 16V; I O1 = 6mA, IO2 = 8mA, IO3 = 4mA; IO4 = 0.4mA; CO = 10µF max; Tamb = -40 to 85°C, unless otherwise specified.) Symbol Parameter Test Condition Typ. Max. Unit 9.7 9.5 10 10 10.3 10.5 V V V O1 Output Voltage ∆VO1 Load Regulation IO1 = 6 to 300mA 150 mV Quiescent Current (∆IS) VS = 14V; IO1 = 6mA; VS =14V ; IO1 = 300mA; 10 30 mA mA Dropout Voltage IO1 = 300mA 400 600 mV mV 800 mA IQ VS-VO1 IO1 = 300mA; Tamb = 25°C; 11V < VS < 16V all temps Min. T amb = 25°C; all temps ΙL V O1 V O1 V O1 ∆VO1 Current Limit (Foldback) note1 VO1 = 0V Max Bat.Trans. R O = 100Ω Ramp VS from 14 to 60V in 3-5ms 360 Hold V S at 60V for 10ms Ramp VS from60 to 14V in 3-5ms; Tamb = 25°C; all temps 9.7 9.5 VS = -35V; t ≤ 1ms; RO = 100Ω Check VO1, Tamb = 25°C; all temps 9.7 9.5 Rev. Voltage . VS = -15V; R O = 100Ω -0.4 Ripple rejection fO = 1KHz; 1Vpp AC ; VS =14V IO1 = 180mA; IO2 = 200mA; IO3 = 400mA; IO4 = 40mA; 50 fO = 10KHz; 1Vpp AC ; VS =14V IO1 = 180mA; IO2 = 200mA; IO3 = 400mA; IO4 = 40mA; 50 Rev. Voltage Trans. Line Regulation ∆VO1 across VS range Output Noise 11 V 2 V 10 10 10.3 10.5 V V 10 10 10.3 10.5 V V 1 V dB dB VS = 11V to 26V 50 mV Check Output for AC noise using a 100KHz LP filter Check Output for AC noise using an A weighted filter (2020KHz) 400 µV 200 µV 8.25 8.40 V V V O2 Output Voltage ∆VO2 Load Regulation IO2 = 8 to 400mA 150 mV Quiescent Current (∆IS) VS = 14V; IO2 = 8mA; VS = 14V; IO2 = 400mA; 10 35 mA mA Dropout Voltage IO2 = 400mA set VS = VO2+1V; Tamb = 25°C; set VS = VO2+1.5V;all temps 400 600 mV mV 960 mA ∆IQ VS-VO2 ΙL V O2 IO2 = 400mA; Tamb = 25°C; all temps Current Limit (Foldback) note1 VO2 = 0V Max Bat.Trans. R O = 100Ω Ramp VS from 14 to 60V in 3-5ms Hold V S at 60V for 10ms Ramp VS from60 to 14V in 3-5ms; Tamb = 25°C; all temps 7.75 7.60 8 8 480 7.75 7.60 8 8 9 V 2 V 8.25 8.40 V V 3/9 L4948 ELECTRICAL CHARACTERISTICS (continued) Symbol V O2 V O2 ∆VO2 Parameter Test Condition Min. Typ. Max. Unit VS = -35V; R O = 100Ω t ≤ 1ms Check VO2, standard Tamb = 25°C; all temps 7.75 7.60 8 8 8.25 8.40 V V Rev. Voltage . VS = -15V; t = 30s; RO = 100Ω -0.4 Ripple rejection fO = 1KHz; 1Vpp AC ; VS =14V IO1 = 180mA; IO2 = 200mA; IO3 = 400mA; IO4 = 40mA; 50 dB fO = 10KHz; 1Vpp AC ; VS =14V IO1 = 180mA; IO2 = 200mA; IO3 = 400mA; IO4 = 40mA; 50 dB Rev. Voltage Trans. Line Regulation ∆VO2 across VS range VS = 10.5V to 26V mV 5.15 5.25 V V mV IO3 = 600mA; Tamb = 25°C; all temps ∆VO3 Line Regulation VS = 7V to 26V 40 ∆VO3 Load Regulation IO3 = 4 to 600mA 100 mV Quiescent Current (∆IS) VS = 14V; IO3 = 4mA; VS = 14V; IO3 = 600mA; 8 40 mA mA Dropout Voltage IO3 = 600mA set VS = VO3+1V; Tamb = 25°C; set VS = VO3+1.5V;all 400 600 mV mV 1440 mA IL V O3 V O3 V O3 Current Limit (Foldback) note 1 VO3 = 0V Max Bat.Trans. R O = 100Ω Ramp VS from 14 to 60V in 3-5ms 5 5 40 Output Voltage VS-VO3 4.85 4.75 V V O3 ∆IQ 720 6 V 2 V 5 5 5.15 5.25 V V 5 5 5.15 5.25 V V Hold V S at 60V for 10ms Ramp VS from60 to 14V in 3-5ms; Tamb = 25°C; all temps 4.85 4.75 VS = -35V; t < 1ms; RO = 100Ω Check VO3, standard Tamb = 25°C; all temps 4.85 4.75 Rev. Voltage . VS = -15V; R O = 100Ω -0.4 Ripple rejection fO = 1KHz; 1Vpp AC ; VS =14V IO1 = 180mA; IO2 = 200mA; IO3 = 400mA; IO4 = 40mA; 50 dB fO = 10KHz; 1Vpp AC ; VS =14V 50 dB Rev. Voltage Trans. Output Noise 1 Check Output for AC noise using a 100KHz LP filter Check Output for AC noise using an A weighted filter (2020KHz) V 400 µV 200 µV 5.15 5.25 V V V O4 Output Voltage IO4 = 100mA; Tamb = 25°C; all temps ∆VO4 Line Regulation VS = 7V to 26V 40 mV ∆VO4 Load Regulation IO4 = 0.4 to 100mA 80 mV Quiescent Current VS = 14V; IO4 = 2mA; VS = 14V; IO4 = 100mA; 450 20 µA mA Dropout Voltage IO4 = 100mA set VS = VO4+0.5V; Tamb = 25°C; set VS = VO4+0.8V;all temps 400 600 mV mV 300 mA ∆IQ VS-VO4 ΙL 4/9 1 Current Limit (Foldback) note 1 VO4 = 0V 4.85 4.75 150 5 5 L4948 ELECTRICAL CHARACTERISTICS (continued) Symbol V O4 V O4 V O4 Parameter Max Bat.Trans. VI ON/OFF VR Iq Min. Typ. R O = 1000Ω Ramp VS from 14 to 60V in 3-5ms Max. Unit 6 V 6 V 5 5 5.15 5.25 V V 5 5 5.15 5.25 V V Hold V S at 60V for 10ms Ramp VS from60 to 14V in 3-5ms; Tamb = 25°C; all temps 4.85 4.75 VS = -35V; t < 1ms; RO = 1000Ω Check VO4, standard Tamb = 25°C; all temps 4.85 4.75 Rev. Voltage . VS = -15V; R O = 1000Ω -0.4 Ripple rejection fO = 1KHz; 1Vpp AC ; VS =14V IO1 = 180mA; IO2 = 200mA; IO3 = 400mA; IO4 = 40mA; 50 dB fO = 10KHz; 1Vpp AC ; VS =14V IO1 = 180mA; IO2 = 200mA; IO3 = 400mA; IO4 = 40mA; 50 dB Rev. Voltage Trans. Output Noise ON/OFF Test Condition Input Current Check Output for AC noise using a 100KHz LP filter Check Output for AC noise using an A weighted filter (2020KHz) VS = 14V; VIH = >2V; VS = 14V; VIL = <0.8V; 1 V 400 µV 200 µV 1 µA µA -10 Input Threshold VS = 14V V IL VS = 14V VIH 0 2 0.8 12 V V Reset Output Voltage Set VS so that VO4 < 4.5V; R O = 200KΩ to V04; VIL = ”0” 0 0.75 V VS so that VO4 -0.15V; R O = 200KΩ to V04; VIH = ”1” 2.75 5 V LVW and Reset fall Time Set Measured from 90% to 10% 150 µs LVW and Reset Rise Time Measured from 90% to 100% 300 LVW Output Threshold Ramp VS down until LVW switches from”1” to a ”0” LVW Output Voltage 7.0 8.2 µs V STCAP <6.5V;R O = 200KΩ to VO4; VIL = ”0” 0 0.75 V STCAP >7.5V;R O = 200KΩ to VO4; VIH = ”1” 2.75 50 V Reset Output Stability VS is set such that 1 < V04 < 4V; IOUT4 = 2mA; VON/OFF = 0 meas reset variation 50 mV St-By Quiescent Current (∆IS) VON/OFF = 0V; IO 4 = 100mA; VS = 14V; IO 1,2,3 = 0mA 20 mA VON/OFF = 0V; IO 4 = 2mA; Vbat = 14V; IO1,2,3 = 0mA 500 µA Maximum Quiescent Current (∆IS) VS = 14V; IO1 = 300mA; IO2 = 400mA; IO3 = 600mA; IO4 = 100mA; VO = 5V 110 mA STCAP Output Voltage VS = 24V; VS = 60V. 1ms 17 18 V V 15 Note 1: 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. 5/9 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 V04 drops 0.15V below it’s typical reading. A reset will occur between a minimum of TIMING DIAGRAM 5.0 5.0 Graphs of the Output Curves for VO1,2,3 and 4 7.8 6/9 4.5 and a maximum of 5V on V04. When the V04 drops between 4.5 and 5V the RESET output goes low. It is very important that the RESET output doesn’t go above 0.75V until the V04 output has gone back above 4.75V (typical). The microprocessor looks for a rising edge. So, any spike will tell the microprocessor to start operating. Once the STCAP line passes 7V (typical), the LVW output will also return to high state. L4948 The STCAP pin acts like a delay circuit. Due to the large capacitor (470µF), the STCAP pin allows the battery voltage to decay slowly giving the microprocessor time to store data. Also, during short low voltage or negative voltage conditions, the STCAP pin protects the 5V st-by output from dropping below the RESET and LVW trip points The four outputs are expected to follow the battery voltage down to 7V. At 7V typical the LVW tells the microprocessor to stop operation and save operating data Below 7V the outputs are expected to stay alive and ready for a return of battery. The L4948 has a st-by mode to keep the microprocessor 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. A low on the ON/OFF pin places the part in st-by mode.V01, V02, V03 will be off during st-by mode. Graphs of the Output Curves for VO1,2,3 and 4 (Cont.) Notes and Information The following information is for clarification, not for specification definition. Please use the information in this way. 7/9 L4948 DIM. mm MIN. TYP. A B C D inch MAX. 5 MIN. TYP. 2.65 1.6 MAX. 0.197 0.104 0.063 1 0.039 E F G G1 0.49 0.88 1.45 16.75 H1 H2 19.6 L L1 21.9 21.7 22.2 22.1 22.5 22.5 0.862 0.854 0.874 0.87 0.886 0.886 L2 L3 L4 17.4 17.25 10.3 17.5 10.7 18.1 17.75 10.9 0.685 0.679 0.406 0.689 0.421 0.713 0.699 0.429 L7 M M1 2.65 4.25 4.73 4.55 5.08 2.9 4.85 5.43 0.104 0.167 0.186 0.179 0.200 0.114 0.191 0.214 S S1 1.9 1.9 2.6 2.6 0.075 0.075 0.102 0.102 Dia1 3.65 3.85 0.144 0.152 8/9 1.7 17 OUTLINE AND MECHANICAL DATA 0.55 0.95 1.95 17.25 0.019 0.035 0.057 0.067 0.659 0.669 0.022 0.037 0.077 0.679 0.772 20.2 0.795 Multiwatt11 V L4948 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. 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 9/9