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L4946B
QUAD VOLTAGE REGULATOR WITH INHIBIT AND RESET
ADVANCE DATA
4 OUTPUTS: 10V (125mA); 8.5V (250mA); 5V (200mA); 5V (100mA) 10V AND 5V (100mA) OUTPUT 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 L4946B is a quad output low drop voltage regulator. The four outputs are a low drop 10V at 125mA (VO1), a 8.5V at 250mA (VO2), a 5V at 200mA (VO3) and a low drop 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. BLOCK DIAGRAM
MULTIPOWER BCD TECHNOLOGY
Multiwatt 11 ORDERING NUMBER: L4946B
The STCAP pin allows the battery voltage to decay slowly giving the P time to store data. This IC is designed for supplying microcomputer controlled systems specially in automotive applications.
L4946B
125mA
8.5V
250mA
200mA
November 1994
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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.
L4946
OPERATING CONDITION
Symbol VS IL Supply Voltage Load Current IO1 IO2 IO3 IO4 Parameter Value -13.5 to 26.5 300 400 600 100 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 5 0 to 5 -65 to 150 max 150 60 Unit V V V C C V
PIN CONNECTION
APPLICATION CIRCUIT
0.1uF
L4946
THERMAL DATA
Symbol R th j-case 2/9 Parameter Thermal Resistance Junction-case max Value 2 Unit C/W
L4946
ELECTRICAL CHARACTERISTICS (VS = 10.5 to 16V; IO1 = 6mA, IO2 = 8mA, IO3 = 4mA; IO4 = 0.4mA; CO = 10F max; Tamb = -40 to 85C, unless otherwise specified.)
Symbol VO1 VO1 IQ VS-VO1 Parameter Output Voltage Load Regulation Quiescent Current (IS) Dropout Voltage Test Condition IO1 = 125mA; 11V < VS < 16V IO1 = 5 to 125mA VS = 14V; IO1 = 5mA; VS =14V ; IO1 = 125mA; IO1 = 125mA Tamb = 25C all temps L VO1 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 = 120-10KHz; 1VppAC ; VS =14V IO1 = 90mA; IO2 = 125mA; IO3 = 75mA; IO4 = 50mA; fO = 20-20KHz; 1VppAC ; VS =14V IO1 = 90mA; IO2 = 125mA; IO3 = 75mA; IO4 = 50mA; VO1 VO2 VO2 IQ VS-VO2 Line Regulation VO1 across VS range Output Voltage Load Regulation Quiescent Current (IS) Dropout Voltage VS = 11V to 26V IO2 = 250mA; Tamb = 25C; all temps IO2 = 5 to 250mA VS = 14V; IO2 = 5mA; VS = 14V; IO2 = 250mA; IO2 = 250mA Tamb = 25C all temps L VO2 Current Limit (note1) Max Bat.Trans. 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 VO2 Rev. Voltage Trans. VS = -35V; t < 1ms; RO = 100 Check VO2, standard Tamb = 25C all temps VS = -15V; t = 30s; RO = 100 300 400 600 600 9 2 7.85 7.60 8 8 8.15 8.20 mV mV mA V V V V 7.75 7.60 8 8 150 400 600 300 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 Tamb = 25C; all temps Min. 9.7 9.5 Typ. 10 10 Max. 10.3 10.5 150 10 18 Unit V V mV mA mA
VO1
Rev. Voltage . Ripple rejection (by design only)
50 8.25 8.40 150 10 35
mV V V mV mA mA
7.85 7.80 -0.4
8 8
8.15 8.20 1
V V V
VO2
Rev. Voltage .
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L4946
ELECTRICAL CHARACTERISTICS (continued)
Symbol Parameter Ripple rejection Test Condition fO = 120-10KHz; 1VppAC ; VS =14V IO1 = 90mA; IO2 = 125mA; IO3 = 75mA; IO4 = 50mA; fO = 20-20KHz; 1VppAC ; VS =14V IO1 = 90mA; IO2 = 125mA; IO3 = 75mA; IO4 = 50mA; VS = 10.5V to 26V Check output for AC noise using A weighted filter (2020KHz) Check output for AC noise using 100kHz LP (20-100KHz) IO3 =200mA; Tamb = 25C; all temps VS = 7V to 26V IO3 = 5 to 200mA VS = 14V; IO3 = 5mA; VS = 14V; IO3 = 200mA; IO3 = 200mA Tamb = 25C; all temps IO3 = 5mA set VS = VO3+0.3V; Tamb = 25C; set VS = VO3+0.4V;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 VS = -35V; t < 1ms; RO = 100 Check VO3, standard Tamb = 25C; all temps VS = -15V; RO = 100 fO = 120-10KHz; 1VppAC ; VS =14V IO1 = 90mA; IO2 = 125mA; IO3 = 75mA; IO4 = 50mA; fO = 10KHz; 1Vpp AC ; VS =14V 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 = 0.5 to 100mA VS = 14V; IO4 = 2mA; VS = 14V; IO4 = 100mA; IO4 = 100mA Tamb = 25C all temps VO4 = 0V Min. 50 Typ. Max. Unit dB
50
dB
VO2
Line Regulation VO2 across VS range Output Noise (design only)
40 200
mV V V V V mV mV mA mA mV mV mV mV mA V V V V V V V dB
400 4.85 4.75 5 5 5.15 5.25 40 100 10 25 400 600 400 500 480 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
VO3 VO3 VO3 IQ VS-VO3
Output Voltage Line Regulation Load Regulation Quiescent Current (IS) Dropout Voltage
IL VO3
Current Limit note 1 Max Bat.Trans.
240
VO3
Rev. Voltage Trans.
VO3
Rev. Voltage . Ripple rejection
50 400 200
Output Noise
dB V V
VO4 VO4 VO4 IQ VS-VO4 L
Output Voltage Line Regulation Load Regulation Quiescent Current Dropout Voltage
4.85 4.75
5 5
5.15 5.25 40 80 500 20 400 600 300
V V mV mV A mA mV mV mA
Current Limit (note 1)
120
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L4946
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; 1VppAC ; VS =14V IO1 = 90mA; IO2 = 125mA; IO3 = 75mA; IO4 = 50mA; fO = 10KHz; 1Vpp AC ; VS =14V IO1 = 90mA; IO2 = 125mA; IO3 = 75mA; IO4 = 50mA; Output Noise (design only) Check output for AC noise using A weighted filter (2020KHz) Check output for AC noise using 100kHz LP (20-100KHz) ON/OFF VI ON/OFF VR Input Current Input Threshold Reset Output Voltage Set VS = 14V; VIH = >2V; VS = 14V; VIL = <0.8V; VS = 14V VIL VS = 14V VIH VS so that VO4 < 4.5V; RO = 200K to V04; VIL = "0" VS so that VO4 -0.15V; RO = 200K to V04; VIH = "1" Reset and LVW Output Rise Time LVW Output Threshold LVW and LVW Output Fall Time LVW Output Voltage STCAP <7V;RO = 200K to VO4; VIL = "0" STCAP >8V;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 = 175mA; IO2 = 275mA; IO3 = 200mA; IO4 = 100mA; VO = 5V VS = 24V; VS = 60V. 1ms 15 0 2.75 Ramp VS down until LVW switches from"1" to a "0" 7.0 -10 0 2 0 2.75 0.8 5 0.4 5 100 8.2 150 0.4 5 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
200
V V A A V V V V s V s V V mV
400 1
Iq
St-By Quiescent Current (IS)
20 500 100
mA A mA
17 18
V V
Note 1: The L4946 has "Foldback" on its outputs during current limiting. As the output loading is increasing the current supplied by the L4946 increases until a threshold is reached. When the current limiting threshold is reached, the L4946 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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L4946
FUNCTIONAL DESCRIPTION The L4946 includes a monitoring circuit to warn the microprocessor if a low voltage or no voltage condition is occurring. Between 7V and 8V 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 4.5 and a maximum of 5V on V04. The reset output will go TIMING DIAGRAM
7.5 7.5
low when V04 drops 0.15 below it's typical value. A reset will occur between a minimum of 4.5V 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 7.5V (typical), the LVW output will also return to high state.
5.0
150s
100s
5.0
150s
100s
Graphs of the Output Curves for VO1,2,3 and 4
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L4946
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 L4946 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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L4946
MULTIWATT 11 PACKAGE MECHANICAL DATA
DIM. MIN. A B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 21.9 21.7 17.4 17.25 10.3 2.65 4.25 4.73 1.9 1.9 3.65 4.55 5.08 17.5 10.7 22.2 22.1 0.49 0.88 1.45 16.75 19.6 20.2 22.5 22.5 18.1 17.75 10.9 2.9 4.85 5.43 2.6 2.6 3.85 0.862 0.854 0.685 0.679 0.406 0.104 0.167 0.186 0.075 0.075 0.144 0.179 0.200 0.689 0.421 0.874 0.87 1.7 17 1 0.55 0.95 1.95 17.25 0.019 0.035 0.057 0.659 0.772 0.795 0.886 0.886 0.713 0.699 0.429 0.114 0.191 0.214 0.102 0.102 0.152 0.067 0.669 mm TYP. MAX. 5 2.65 1.6 0.039 0.022 0.037 0.077 0.679 MIN. inch TYP. MAX. 0.197 0.104 0.063
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L4946
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) 1996 SGS-THOMSON Microelectronics All Rights Reserved 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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