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L4936E
ADVANCED VOLTAGE REGULATOR
PRODUCT PREVIEW
ENABLE AND SENSE INPUTS (EN, SI) PROTECTED AGAINST NEGATIVE TRANSIENTS DOWN TO -5V RESET THRESHOLD ADJUSTABLE FROM 3.8 TO 4.7V EXTREMELY LOW QUIESCENT CURRENT, 65A (LESS THAN 90A) IN STANDBY MODE OPERATING DC SUPPLY VOLTAGE RANGE 5V - 28V OPERATING TRANSIENT SUPPLY VOLTAGE UP TO 40V HIGH PRECISION STANDBY OUTPUT VOLTAGE 5V 1% WITH 100mA CURRENT CAPABILITY OUTPUT 2 VOLTAGE 5V 2% WITH 400mA CURRENT CAPABILITY (ADJ WIRED TO VOUT2) OUTPUT 2 VOLTAGE ADJUSTABLE BY EXTERNAL VOLTAGE DIVIDER OUTPUT 2 DISABLE FUNCTION FOR STANDBY MODE PIN CONNECTIONS (Top views)
MULTIWAT T 11
MULTIW ATT 15
ORDERING NUMBERS: L4936E (Multiwatt 11) L4936EH (Multiwatt 15)
DESCRIPTION The L4936E is a monolithic integrated dual voltage regulator with two very low dropout outputs and additional functions as power-on reset and input voltage sense. It is designed for supplying the microcomputer controlled systems especially in automotive applications.
15
OUT2 ADJ OUT1 SO N.C. N.C. RES GND EN N.C. CT PR SI VS1 VS2
11 10 9 8 7 6 5 4 3 2 1
OUT2 ADJ OUT1 SO RES GND EN CT PR SI VS1/VS2
14 13 12 11 10 9 8 7 6 5 4 3 2
TAB CONNECTED TO PIN 6
1
D94AT077
TAB CONNECTED TO PIN 6
D94AT078A
Multiwatt11
Multiwatt15
January 1995
1/11
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
L4936E
ABSOLUTE MAXIMUM RATINGS
Symbol VINDC VINTR IO VSI ISI VEN IEN VRES , VSO IRES , ISO PO Tstg Tj TJSD
Note:
Parameter DC Operating Supply Voltage Transient Operating Supply Voltage (T < 400ms) Output Current Sense Input Voltage (Voltage Forced) (note 2) Sense Input Current (Current Forced) (note 2) Enable Input Voltage (Voltage Forced) (note 2) Sense Input Current (Current Forced) (note 2) Output Voltages Output Currents (Output Low) Power Dissipation at Tamb = 80C (note 3) Multiwatt 11 (Rth heatsink = 9K/W) Storage Temperature Operating Junction Temperature Thermal shutdown junction temperature Output 2 will shut-down typically at Tj 10K lower than output 1
Value 28 -14 to 40 internally limited -20 to 20 1 -20 to 20 1 -0.3 to 20 5 5 -65 to 150 -40 to 150 165
Unit V V V mA V mA V mA W C C C
The circuit is ESD protected according to MIL-STD-883C
Note 2: Current forced means voltage unlimited but current limited to the specified value Voltage forced means voltage limited to the specified valueswhile the current is not limited Note 3: Typical value soldered on a PC board with 8 cm2 copper ground plane (35mm thick)
BLOCK DIAGRAM
VS1
OUT1
1.23V REG1 VS2
REFERENCE
OUT2 ADJ
EN REG2
1.23V
1.23V
CT RES
PR RESET
1.4V
SI 1.23V SENSE
D94AT074A
SO
GND
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L4936E
THERMAL DATA
Symbol Rth j-case Parameter Thermal Resistance Junction-case MW 11 3 MW 15 Unit C/W
Note 3: Typical value soldered on a PC board with 8 cm2 copper ground plane (35mm thick)
PIN FUNCTIONS
PIN (MW 11) 1 1 2 3 4 5 6 7 8 9 10 11 PIN (MW 15) 1 2 3 4 5 7 8 9 12 13 14 15 6, 10, 11 Name VS1 VS2 S1 PR CT EN GND RES SO OUT 1 ADJ OUT 2 NC Function Supply Voltage (400mA Regulator) Supply Voltage (100mA Regulator, Reset, Sense) Sense Input Reset Theresold Programming Reset Delay Capacitor Enable (low will activate the 400mA regulator) Ground Reset Output Sense Output 100mA Regulator Output Feedback of 400mA Regulator 400mA Regulator Output Not Connected
ELECTRICAL CHARACTERISTICS (VS = 14V; Tj = -40 to 150C unless otherwise specified.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
OUT 1
VO1 Supply Output Voltage VS = 6 to 28V; IO1 = 400A to 100mA Tj 125C; IO1 = 50 to 400A IOUT1 = 10mA IOUT1 = 100mA; VS = 4.8V IOUT1 = 1 to 100mA (after regulation setting) VOUT1 = 0.8 to 4.5V IEN 2.4V (output 2 disabled) IO1 = 0.1mA; VSI > 1.3V TJ < 85C; RPR = 0 Enable = LOW; VS = 6 to 28V; I02 = 5 to 400mA IOUT2 = 100mA; VS = 4.8V IOUT2 = 400mA; VS = 4.8V IOUT1 = 5 to 400mA (after regulation setting) V02 = 0.8 to 4.5V IOUT1 = 100mA; IOUT2 = 400mA VS = 6 to 28V; IO1 = 1mA, IO2 = 5mA, (after regulation setting) 4.9 4.8 5 5 0.1 0.2 5.1 5.2 0.2 0.4 25 400 90 V V V V mV mA A A 5.1 0.2 0.3 0.3 0.6 50 150 1300 20 V V V mV K mA mA
VDP1 VOL01 VLIM1 IQSB
Dropoutput Voltage 1 Load Regulation 1 Current Limit 1 Quiescent Current in Standby Mode
100
200 65 75
OUT 2
VO2 VDP2 VOL02 RADJ ILIM2 IQ VOLi 1,2 Output Voltage 2 ADJ connected to OUT 2 Dropoutput Voltage 2 Load Regulation 2 Adjust Input Resistance Current Limit 2 Quiescent Current 4.9
60 450
100 650
OUT1, OUT 2
Line Regulation 20 mV
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L4936E
ELECTRICAL CHARACTERISTICS (Continued.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
ENABLE INPUT
VENL VENH VENhyst IEN LOW IEN HIGH Enable Input Low Voltage (Output 2 Active) Enable Input High Voltage Enable Hysteresis Enable Input Current Low Enable Input Current High VEN = 0 VEN = 1.1 to 7V; TJ < 130C; VEN = 1.1 to 7V; TJ = 130 to 150C; -20 1.4 20 -20 -1 -10 30 -8 0 0 1 20 60 -3 1 10 V V mV A A A
RESET CIRCUIT
VRT VRTH tRD min tRD nom tRR ICT ICT VRESL VRESH Reset Theresold Voltage (note4) Reset Theresold Hysteresis Reset Pulse Delay Reset Pulse Delay Reset Reaction Time Pull Down Capability of the Discharge circuit Charge Current Reset Output Low Voltage Reset Output High Leakage current R PR = R PR = 0 R PR = C RES = 47nF; t r 30s; (note 5) C RES = 47nF; (note 6) C RES = 47nF VOUT1 < VRT VOUT1 > VRT RRES = 10K to VOUT1 VOUT1 1.5V VRES = 5V 4.5 3.65 15 40 60 10 3 -1.3 VO1-0.3 VO1-0.2 3.8 40 60 100 50 6 -1 3.95 100 100 140 150 15 0.7 0.4 1 V V mV ms ms s mA A V A
SENSE COMPARATOR
VSI VSIT VSITH VSOL ISOH ISI HIGH ISI LOW Functional Range Sense Threshold Voltage Sense Threshold Hysteresis Sense Output Low Voltage Sense Output Leakage Sense Input Current High Sense Input Current Low V SI 1.05V; RSO =10K connected to 5V; VS 5V VSO = 5V; VSI 1.5V VSI = 1.1 to 7V; TJ <130C VSI = 1.1 to 7V; TJ 130 to 150C VSI = 0V -1 -10 -20 0 0 -8 Falling Edge; TJ <130C Falling Edge; TJ 130 to 150C -20 1.08 1.05 10 1.16 1.16 30 20 1.24 1.29 60 0.4 1 1 10 -3 V V V mV V A A A A
Note : 4) The reset threshold can be programmed continuously from typ 3.8V to 4.7V by changing a value of an external resistor from pin PR to GN 5) This is a minimum reset time according to the hysteresis of the comparator. Delay time starts with VOUT1 exceeding VRT 6) This is the nominal reset time depending on the discharging limit of CT (saturation voltage) and theupper threshold of the timer comparator. Delay time starts with VOUT1 exceeding VRT 7) The leakage of CT must be less than 0.5mA (2V). If an external resistor between CT and VOUT1 is applied, the leakage current may be increased. The external resistor should have more than 30K. for stability: Cs 1F, C01 10F, C02 10F, ESR 5 (designed target for resistive load) For details see application note. 8) For transients exceeding 20V or -20V external protection is required at the Pins SI and EN as shown at Pin EN. The protection proposed will provide proper function for transients in the range of 200V. If the zener diode is omitted the external resistor should be raised to 200K to limit the current to 1mA. Without the zener diode, the function 20V or -20V can not be guaranteed.
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L4936E
APPLICATION CIRCUIT
VS1 CS 1.23V REG1 (Note 8) 100K 15V EN REG2 1.23V REFERENCE
OUT1 CO1
OUT2 VS2 ADJ CO2
for example BZX97C15 PR
1.23V
CT
CT (Note 7)
RES V OUT1 RESET SI 1.4V SO RSO
1.23V SENSE
D94AT079A
GND
FUNCTIONAL DESCRIPTION The L4936E is a monolithic integrated dual voltage regulator, based on the STM modulator voltage regulator approach. Several outstanding features and auxiliary functions are implemented to meet the requirements of supplying microprocessor systems in automotive applications. Nevertheless, it is suitable also in other applications where two stabilized voltages are required. The modular approach of this device allows to get easly also other features and functions when required. Standby Regulator The standby regulator uses an Isolated collector Vertical PNP transistor as a regulating element. With this structure very low dropout voltage at currents up to 100mA is obtained. The dropout operation of the standby regulator is maintained down to 3V input supply voltage. The output voltage is regulated up to the transient input supply voltage of 40V. With this feature no functional interruption due to overvoltage pulses is generated. In the standby mode when the output 2 is disabled, the current consumption of the device (qui-
escent current) is less than 90A (14V supply voltage). To reduce the quiescent current peak in the undervoltage region and to improve the transient response in this region, the dropout voltage is controlled. A second regulation path will keep the output voltage without load below 5.5V even at high temperatures. Output 2 Voltage The output 2 regulator uses the same output structure as the standby regulator but rated for the output current of 400mA. The output voltage is internally fixed to 5V if ADJ is connected to VOUT2.
OUT2 R1E R2E RADJ R2i total 100K typical
D94AT080
ADJ R1i + 1.23V
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L4936E
The output 2 regulator can be switches OFF via the enable input. Connecting a resistor divider R1E, R2E to the ADJ, OUT2 pin the output voltage 2 can be programmed to the value of R1E(R2E + RADJ) VOUT2 = VOUT1 1 + R2E * RADJ with RADJ = 60K to 150K and VOUT1 = 4.95 to 5.05V. For an exact calculation the temperature coefficient (Tc -2000pprm) of the internal resistor (RADJ) must be taken into account. Pin ADJ in this mode should not have a capacitive burden because this would reduce the phase margin of the regulator loop. Reset circuit The reset circuit supervises the standby output voltage. The reset output (RES) is defined from VOUT 1V. Even if VS is lacking, the reset generator is supplied by the output voltage VOUT1. The reset threshold of 4.7V is defined with the internal reference voltage (note 9) and standby output divider, when pin PR is left open. The reset threshold voltage can be programmed in the range from 3.8V to 4.7V by connecting an external resistor from pin PR to GND. The value of the programming resistor RPR can be calculated with: RPR = 22K -92.9K, 3.8V VRT 4.7V 4.7V -1 VRT from the noise immunity. Standby output voltage drops below the reset threshold only a bit longer than the reaction time results in a shorter reset delay time. The nominal reset delay time will be generated for standby output voltage drops longer than approximately 50s. The minimum reset time is generated if reset condition only occures for a short time triggering a reset pulse but not completely discharging CT. The reset can be related to output2 on request. If higher charge currents for the reset capacitor are required a resistors from Pin CT to OUT1, may be used to increase the current. We recommended the use of 10K to 5V as an output pull up. Sense Comparator The sense comparator compares an input signal with an internal voltage reference of typical 1.23V. The use of an external voltage divider makes this comparator very flexible in the application. It can be used to supervise the input voltage either before or after the protection diode and to give additional information to the microprocessor like low voltage warnings. We recommended the use of 10K to 5V as an output pull up.
Note 9: The reference is alternatively supplied from VS or VOUT1. If one supply is present, the reference is operating.
The reset pulse delay time tRD, is defined with the charge time of an external capacitor CT: tRDmin = CT *0.6V (note 5) 1A CT *1.4V (note 6) 1A
Thermal Protection Both outputs are provided with an overtemperature shut down regulation power dissipation down to uncritical values. Output 2 will shut down approximately 10K before output 1. Under normal conditions shut down of output 2 will allow the chip to cool down again. Thus output 1 will be unaffected. The thermal shut down reduces the output voltages until power dissipation and the flow of thermal energy out of the chip balance. Transient Sensitivity In proper operation (VOUT > 4.5V) the reference is supplied by VOUT1 thus reducing sensitivity to input transients. Precise Data will be issued as soon as samples are available.
tRDnom =
The reaction time of the reset circuit originates
6/11
L4936E
Figure 3: Reset Generator
OUT1 REF 1.23V 1A 17K PR VOUT1 REG 74K + RES
10...100K
Low threshold VBE at 1A=0.5V at 25C High threshold CT CT
D94AT081
=1.4
Figure 4:
7/11
L4936E
INPUT PROTECTION The Inputs Enable (EN) and sense in(SI) are proFigure 5: tected against negative transients. Figure 5 is showing the simplified schematic
Input Characteristics of SI, EN:
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L4936E
MULTIWATT15 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 22.1 22 17.65 17.25 10.3 2.65 4.2 4.5 1.9 1.9 3.65 4.3 5.08 17.5 10.7 0.49 0.66 1.14 17.57 19.6 20.2 22.6 22.5 18.1 17.75 10.9 2.9 4.6 5.3 2.6 2.6 3.85 0.870 0.866 0.695 0.679 0.406 0.104 0.165 0.177 0.075 0.075 0.144 0.169 0.200 0.689 0.421 1.27 17.78 1 0.55 0.75 1.4 17.91 0.019 0.026 0.045 0.692 0.772 0.795 0.890 0.886 0.713 0.699 0.429 0.114 0.181 0.209 0.102 0.102 0.152 0.050 0.700 mm TYP. MAX. 5 2.65 1.6 0.039 0.022 0.030 0.055 0.705 MIN. inch TYP. MAX. 0.197 0.104 0.063
9/11
L4936E
MULTIWATT11 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 21.5 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 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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L4936E
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) 1995 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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