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L4948
QUAD VOLTAGE REGULATOR WITH INHIBIT AND RESET
ADVANCE DATA
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
MULTIPOWER BCD TECHNOLOGY
Multiwatt 11 ORDERING NUMBER: L4948
cay slowly giving the P time to store data. This IC is designed for supplying microcomputer controlled systems specially in automotive applications.
December 1993
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This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
L4948
OPERATING CONDITION
Symbol VS IL Supply Voltage Load Current IO1 IO2 IO3 IO4 Parameter Value -15 to 27 300 400 600 100 Unit V mA mA mA mA
ABSOLUTE MAXIMUM RATINGS
Symbol VS VI VO Tstg Tj Supply Voltage Input Voltage (ON/OFF) Output Voltage (LVW, Reset) Storage Temperature Range Junction Temperature Range Load Dump (5ms rise, 115ms decay) Parameter Value -35 to 60 0 to 12 0 to 12 -65 to 150 max 150 60 Unit V V V C C V
PIN CONNECTION
APPLICATION CIRCUIT
THERMAL DATA
Symbol Rth j-case 2/9 Parameter Thermal Resistance Junction-case max Value 2 Unit C/W
L4948
ELECTRICAL CHARACTERISTICS (VS = 10.5 to 16V; IO1 = 6mA, IO2 = 8mA, IO3 = 4mA; I O4 = 0.4mA; CO = 10F max; Tamb = -40 to 85C, unless otherwise specified.)
Symbol VO1 VO1 IQ VS-VO1 L VO1 Parameter Output Voltage Load Regulation Quiescent Current (IS) Dropout Voltage Test Condition IO1 = 300mA; Tamb = 25C; 11V < VS < 16V all temps IO1 = 6 to 300mA VS = 14V; IO1 = 6mA; VS =14V ; IO1 = 300mA; IO1 = 300mA Tamb = 25C; all temps Current Limit (Foldback) note1 Max Bat.Trans. VO1 = 0V RO = 100 Ramp VS from 14 to 60V in 3-5ms Hold VS at 60V for 10ms Ramp VS from 60 to 14V in 3-5ms; Tamb = 25C; all temps VO1 Rev. Voltage Trans. VS = -35V; t 1ms; RO = 100 Check VO1, Tamb = 25C; all temps VS = -15V; RO = 100 fO = 1KHz; 1Vpp AC ; VS =14V IO1 = 180mA; IO2 = 200mA; IO3 = 400mA; IO4 = 40mA; fO = 10KHz; 1Vpp AC ; VS =14V IO1 = 180mA; IO2 = 200mA; IO3 = 400mA; IO4 = 40mA; VO1 Line Regulation VO1 across VS range Output Noise VS = 11V to 26V Check Output for AC noise using a 100KHz LP filter Check Output for AC noise using an A weighted filter (2020KHz) IO2 = 400mA; Tamb = 25C; all temps IO2 = 8 to 400mA VS = 14V; IO2 = 8mA; VS = 14V; IO2 = 400mA; IO2 = 400mA set VS = VO2+1V; Tamb = 25C; set VS = VO2+1.5V;all temps VO2 = 0V RO = 100 Ramp VS from 14 to 60V in 3-5ms Hold VS at 60V for 10ms Ramp VS from 60 to 14V in 3-5ms; Tamb = 25C; all temps 480 7.75 7.60 8 8 360 400 600 800 11 2 9.7 9.5 9.7 9.5 -0.4 50 dB 50 dB 10 10 10 10 10.3 10.5 10.3 10.5 1 mV mV mA V V V V V V V Min. 9.7 9.5 Typ. 10 10 Max. 10.3 10.5 150 10 30 Unit V V mV mA mA
VO1
Rev. Voltage . Ripple rejection
50 400 200
mV V V
VO2 VO2 IQ VS-VO2 L VO2
Output Voltage Load Regulation Quiescent Current (IS) Dropout Voltage
8.25 8.40 150 10 35 400 600 960 9 2
V V mV mA mA mV mV mA V V V V
Current Limit (Foldback) note1 Max Bat.Trans.
7.75 7.60
8 8
8.25 8.40
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L4948
ELECTRICAL CHARACTERISTICS (continued)
Symbol VO2 Parameter Rev. Voltage Trans. Test Condition VS = -35V; RO = 100 t 1ms Check VO2, standard Tamb = 25C; all temps VS = -15V; t = 30s; RO = 100 fO = 1KHz; 1Vpp AC ; VS =14V IO1 = 180mA; IO2 = 200mA; IO3 = 400mA; IO4 = 40mA; fO = 10KHz; 1Vpp AC ; VS =14V IO1 = 180mA; IO2 = 200mA; IO3 = 400mA; IO4 = 40mA; VO2 VO3 VO3 VO3 IQ VS-VO3 Line Regulation VO2 across VS range Output Voltage Line Regulation Load Regulation Quiescent Current (IS) Dropout Voltage VS = 10.5V to 26V IO3 = 600mA; Tamb = 25C; all temps VS = 7V to 26V IO3 = 4 to 600mA VS = 14V; IO3 = 4mA; VS = 14V; IO3 = 600mA; IO3 = 600mA set VS = VO3+1V; Tamb = 25C; set VS = VO3+1.5V;all VO3 = 0V RO = 100 Ramp VS from 14 to 60V in 3-5ms Hold VS at 60V for 10ms Ramp VS from 60 to 14V in 3-5ms; Tamb = 25C; all temps VO3 Rev. Voltage Trans. VS = -35V; t < 1ms; RO = 100 Check VO3, standard Tamb = 25C; all temps VS = -15V; RO = 100 fO = 1KHz; 1Vpp AC ; VS =14V IO1 = 180mA; IO2 = 200mA; IO3 = 400mA; IO4 = 40mA; fO = 10KHz; 1VppAC ; VS =14V Output Noise Check Output for AC noise using a 100KHz LP filter Check Output for AC noise using an A weighted filter (2020KHz) IO4 = 100mA; Tamb = 25C; all temps VS = 7V to 26V IO4 = 0.4 to 100mA VS = 14V; IO4 = 2mA; VS = 14V; IO4 = 100mA; IO4 = 100mA set VS = VO4+0.5V; Tamb = 25C; set VS = VO4+0.8V;all temps VO4 = 0V 150 4.85 4.75 5 5 720 4.85 4.75 5 5 Min. 7.75 7.60 -0.4 50 Typ. 8 8 Max. 8.25 8.40 1 Unit V V V dB
VO2
Rev. Voltage . Ripple rejection
50
dB
40 5.15 5.25 40 100 8 40 400 600 1440 6 2 4.85 4.75 4.85 4.75 -0.4 50 5 5 5 5 5.15 5.25 5.15 5.25 1
mV V V mV mV mA mA mV mV mA V V V V V V V dB
IL VO3
Current Limit (Foldback) note 1 Max Bat.Trans.
VO3
Rev. Voltage . Ripple rejection
50 400 200
dB V V
VO4 VO4 VO4 IQ VS-VO4 L
Output Voltage Line Regulation Load Regulation Quiescent Current Dropout Voltage
5.15 5.25 40 80 450 20 400 600 300
V V mV mV A mA mV mV mA
Current Limit (Foldback) note 1
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L4948
ELECTRICAL CHARACTERISTICS (continued)
Symbol VO4 Parameter Max Bat.Trans. Test Condition RO = 1000 Ramp VS from 14 to 60V in 3-5ms Hold VS at 60V for 10ms Ramp VS from 60 to 14V in 3-5ms; Tamb = 25C; all temps VO4 Rev. Voltage Trans. VS = -35V; t < 1ms; RO = 1000 Check VO4, standard Tamb = 25C; all temps VS = -15V; RO = 1000 fO = 1KHz; 1Vpp AC ; VS =14V IO1 = 180mA; IO2 = 200mA; IO3 = 400mA; IO4 = 40mA; fO = 10KHz; 1VppAC ; VS =14V IO1 = 180mA; IO2 = 200mA; IO3 = 400mA; IO4 = 40mA; Output Noise 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; VS = 14V VIL VS = 14V VIH VS so that V O4 < 4.5V; RO = 200K to V04; VIL = "0" VS so that V O4 -0.15V; RO = 200K to V04; VIH = "1" LVW and Reset fall Time Set LVW and Reset Rise Time LVW Output Threshold LVW Output Voltage Measured from 90% to 10% Measured from 90% to 100% Ramp VS down until LVW switches from"1" to a "0" STCAP <6.5V;RO = 200K to VO4; VIL = "0" STCAP >7.5V;RO = 200K to VO4; VIH = "1" Reset Output Stability VS is set such that 1 < V04 < 4V; IOUT4 = 2mA; VON/OFF = 0 meas reset variation VON/OFF = 0V; IO 4 = 100mA; VS = 14V; IO 1,2,3 = 0mA VON/OFF = 0V; IO 4 = 2mA; Vbat = 14V; IO 1,2,3 = 0mA Maximum Quiescent Current (IS) STCAP Output Voltage VS = 14V; IO1 = 300mA; IO2 = 400mA; IO3 = 600mA; IO4 = 100mA; VO = 5V VS = 24V; VS = 60V. 1ms 15 7.0 0 2.75 -10 0 2 0 2.75 0.8 12 0.75 5 150 300 8.2 0.75 50 50 Min. Typ. Max. 6 6 4.85 4.75 4.85 4.75 -0.4 50 5 5 5 5 5.15 5.25 5.15 5.25 1 Unit V V V V V V V dB
VO4
Rev. Voltage . Ripple rejection
50
dB
400 200
V V A A V V V V s s V V V mV
ON/OFF VI ON/OFF VR
Input Current Input Threshold Reset Output Voltage Set
1
Iq
St-By Quiescent Current (IS)
20 500 110
mA A mA
17 18
V V
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 limi ting 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.
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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 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.
5.0
5.0
Graphs of the Output Curves for VO1,2,3 and 4
7.8
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L4948
The STCAP pin acts like a delay circuit. Due to the large capacitor (470F), 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 Graphs of the Output Curves for VO1,2,3 and 4 (Cont .) 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.
Notes and Information The following information is for clarification, not for specification definition. Please use the information in this way.
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L4948
MULTIWATT11 PACKAGE MECHANICAL DATA
DIM. A B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 21.5 21.4 17.4 17.25 10.3 2.65 4.1 4.88 1.9 1.9 3.65 4.3 5.08 17.5 10.7 0.49 0.88 1.57 16.87 19.6 20.2 22.3 22.2 18.1 17.75 10.9 2.9 4.5 5.3 2.6 2.6 3.85 0.846 0.843 0.685 0.679 0.406 0.104 0.161 0.192 0.075 0.075 0.144 0.169 0.200 0.689 0.421 1.7 17 1 0.55 0.95 1.83 17.13 0.019 0.035 0.062 0.664 0.772 0.795 0.878 0.874 0.713 0.699 0.429 0.114 0.177 0.209 0.102 0.102 0.152 0.067 0.669 MIN. mm TYP. MAX. 5 2.65 1.6 0.039 0.022 0.037 0.072 0.674 MIN. inch TYP. MAX. 0.197 0.104 0.063
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L4948
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics 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 SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1994 SGS-THOMSON Microelectronics - All Rights Reserved MULTIWATT (R) is Registered Trademark of SGS-THOMSON Microelectronics SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A.
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