ADVANCEDVOLTAGE REGULATOR
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,
65µA (LESS THAN 90µA) IN STANDBY
MODE
OPERATINGDC SUPPLY VOLTAGE RANGE
5V -28V
OPERATING TRANSIENT SUPPLY VOLTAGE UP TO 40V
HIGHPRECISIONSTANDBYOUTPUTVOLTAGE 5V±1% WITH 100mA CURRENT CAPABILITY
OUTPUT 2 VOLTAGE 5V ± 2% WITH 400mA
CURRENT CAPABILITY (ADJ WIRED TO
V
)
OUT2
OUTPUT 2 VOLTAGE ADJUSTABLE BY EXTERNAL VOLTAGEDIVIDER
OUTPUT 2 DISABLE FUNCTION FOR
STANDBYMODE
L4936E
MULTIWATT 11
ORDERING NUMBERS: L4936E (Multiwatt 11)
DESCRIPTION
The L4936E is a monolithic integrated dual voltage regulator with two very low dropout outputs
and additionalfunctionsas power-on resetand input voltage sense.It is designedfor supplyingthe
microcomputer controlled systems especially in
automotiveapplications.
MULTIWATT 15
L4936EH (Multiwatt15)
PIN CONNECTIONS (Top views)
11
10
9
8
7
6
5
4
3
2
1
TAB CONNECTEDTO PIN 6
Multiwatt11
June 2000
D94AT077
OUT2
ADJ
OUT1
SO
RES
GND
EN
CT
PR
SI
VS1/VS2
TAB CONNECTEDTO PIN 6
Multiwatt15
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
D94AT078A
OUT2
ADJ
OUT1
SO
N.C.
N.C.
RES
GND
EN
N.C.
CT
PR
SI
VS1
VS2
1/11
L4936E
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
INDC
V
INTR
I
O
V
SI
I
SI
V
EN
I
EN
V
RES,VSO
I
RES,ISO
P
O
T
stg
T
j
T
JSD
Note: The circuit is ESD protected according to MIL-STD-883C
Note 2: Current forced means voltage unlimited but current limited to thespecified value
Voltageforced meansvoltage limited to the specified valueswhile the current is not limited
Note 3: Typicalvalue soldered on a PCboard with 8 cm2 copper ground plane (35mm thick)
DC Operating Supply Voltage 28 V
Transient Operating Supply Voltage (T < 400ms) -14 to 40 V
Output Current internally limited
Sense Input Voltage (VoltageForced) (note 2) -20 to 20 V
Sense Input Current (Current Forced) (note 2) ±1mA
Enable Input Voltage(Voltage Forced) (note 2) -20 to 20 V
Sense Input Current (Current Forced) (note 2)
1mA
±
Output Voltages -0.3 to 20 V
Output Currents (Output Low) 5 mA
Power Dissipation at T
Multiwatt 11 (R
heatsink = 9K/W)
th
=80°C (note 3)
amb
5W
Storage Temperature -65 to 150
Operating Junction Temperature -40 to 150
Thermal shutdownjunction temperature Output 2 will shut-down
165 °C
typically at Tj 10K lowerthan output 1
C
°
C
°
BLOCK DIAGRAM
VS1
VS2
EN
1.23V
PR
SI
REG1
REG2
RESET
OUT1
1.23V REFERENCE
OUT2
ADJ
1.23V
CT
RES
1.4V
SO
2/11
SENSE
1.23V
GND
D94AT074A
THERMAL DATA
Symbol Parameter MW 11 MW 15 Unit
R
th j-case
Note 3: Typicalvalue soldered on a PCboard with 8 cm2 copper ground plane (35mm thick)
Thermal ResistanceJunction-case 3
PIN FUNCTIONS
PIN (MW 11) PIN (MW 15) Name Function
1 1 VS1 Supply Voltage(400mA Regulator)
1 2 VS2 Supply Voltage(100mA Regulator, Reset, Sense)
2 3 S1 Sense Input
3 4 PR Reset Theresold Programming
4 5 CT Reset Delay Capacitor
5 7 EN Enable (low will activate the 400mAregulator)
6 8 GND Ground
7 9 RES Reset Output
8 12 SO Sense Output
9 13 OUT 1 100mA RegulatorOutput
10 14 ADJ Feedback of 400mA Regulator
11 15 OUT 2 400mA RegulatorOutput
6, 10, 11 NC Not Connected
L4936E
C/W
°
ELECTRICALCHARACTERISTICS
= 14V; Tj=-40 to 150°C unless otherwise specified.)
(V
S
Symbol Parameter Test Condition Min. Typ. Max. Unit
OUT 1
V
V
V
V
OL01
I
QSB
O1
DP1
LIM1
Supply Output Voltage VS= 6 to 28V;
I
= 400µA to 100mA
O1
T
125°C; I
≤
Dropoutput Voltage 1 I
Load Regulation 1 I
j
OUT1
I
OUT1
OUT1
O1
= 10mA 0.1 0.2 V
= 100mA; VS= 4.8V 0.2 0.4 V
= 1 to 100mA
= 50 to 400µA 4.8 5 5.2 V
4.9 5 5.1 V
25 mV
(after regulation setting)
Current Limit 1 VOUT1 = 0.8 to 4.5V 100 200 400 mA
Quiescent Current in Standby
Mode
2.4V (output 2 disabled)
I
≥
EN
I
= 0.1mA; VSI> 1.3V
O1
T
<85°C;RPR=0 75 µA
J
65 90
OUT 2
V
V
R
V
OL02
I
LIM2
O2
DP2
ADJ
I
Q
Output Voltage 2
ADJ connected to OUT 2
Dropoutput Voltage 2 I
Load Regulation 2 I
Enable = LOW;VS= 6 to 28V;
I
= 5 to 400mA
02
= 100mA; VS= 4.8V 0.2 0.3 V
OUT2
I
= 400mA; VS= 4.8V 0.3 0.6 V
OUT2
= 5 to 400mA
OUT1
4.9 5.1 V
50 mV
(after regulation setting)
Adjust Input Resistance 60 100 150 K
Current Limit 2 V02 = 0.8 to 4.5V 450 650 1300 mA
Quiescent Current I
OUT1
= 100mA; I
= 400mA 20 mA
OUT2
OUT1,OUT 2
V
OLi 1,2
Line Regulation VS= 6 to 28V; IO1= 1mA,
I
= 5mA,
O2
(after regulation setting)
20 mV
A
µ
Ω
3/11
L4936E
ELECTRICALCHARACTERISTICS (Continued.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
ENABLE INPUT
V
ENL
V
ENH
V
ENhyst
I
EN LOW
I
EN HIGH
RESETCIRCUIT
V
RT
V
RTH
t
RD min
t
RD nom
t
RR
I
CT
I
CT
V
RESL
V
RESH
Enable Input Low Voltage
-20 1 V
(Output 2 Active)
Enable Input High Voltage 1.4 20 V
Enable Hysteresis 20 30 60 mV
Enable Input Current Low VEN= 0 -20 -8 -3
Enable Input Current High VEN= 1.1 to 7V; TJ< 130°C; -1 0 1
= 1.1 to 7V;
V
EN
T
= 130 to 150°C;
J
Reset Theresold Voltage
(note4)
RPR=
R
PR
Reset Theresold Hysteresis RPR=
Reset Pulse Delay C
Reset Pulse Delay C
Reset Reaction Time C
Pull Down Capability of the
RES
RES
RES
V
OUT1<VRT
∞
= 0 3.65 3.8 3.95 V
∞
= 47nF; tr≤ 30µs; (note 5) 40 60 100 ms
= 47nF; (note 6) 60 100 140 ms
= 47nF 10 50 150
-10 0 10 µA
4.5 VO1-0.3 VO1-0.2 V
15 40 100 mV
3615mA
Discharge circuit
Charge Current VOUT1 >VRT -1.3 -1 0.7 µA
Reset Output Low Voltage RRES = 10KΩ to VOUT1
1.5V
OUT1 ≥
=5V 1
RES
Reset Output High Leakage
V
V
0.4 V
current
A
µ
A
µ
s
µ
A
µ
SENSECOMPARATOR
V
SI
V
SIT
V
SITH
V
SOL
I
SOH
I
SI HIGH
I
SI LOW
Note :
4) The reset threshold can beprogrammed continuously from typ 3.8V to 4.7V by changing a valueof an external resistor frompin PR to GN
5) This is a minimum reset timeaccording to the hysteresis of the comparator.Delay time starts with V
6) This is thenominal reset time depending on thedischarging limit of CT(saturationvoltage) and theupper threshold of the timer comparator.
Delay time starts with V
7) The leakage of CTmust be less than 0.5mA (2V). Ifan externalresistor between CT and VOUT1is applied, the leakage current may be
increased. The external resistor should have more than 30KΩ.
for stability: Cs ≥ 1µF, C01 ≥ 10µF, C02 ≥ 10µF, ESR ≤ 5Ω (designed targetfor resistive load) For details see applicationnote.
8) For transients exceeding 20V or -20V externalprotection is required at thePins SIand EN as shown at Pin EN. The protectionproposed will
provide proper function for transients in the range of±200V. If the zener diode is omitted the external resistor should be raised to200K
to limit the current to 1mA. Withoutthe zener diode, the function 20V or -20V can not be guaran teed.
Functional Range -20 20 V
Sense Threshold Voltage Falling Edge; TJ<130°C 1.08 1.16 1.24 V
Falling Edge; T
130 to 150°C 1.05 1.16 1.29 V
J
Sense Threshold Hysteresis 10 30 60 mV
Sense Output Low Voltage V
Sense Output Leakage VSO= 5V; V
Sense Input Current High VSI= 1.1 to 7V; TJ<130°C-101
1.05V; R
≤
SI
connected to 5V; V
= 1.1to 7V; TJ130 to 150°C -10 0 10
V
SI
=10K
SO
SI ≥
Ω
S ≥ 5V
1.5V 1
0.4 V
µ
µ
µ
Sense Input Current Low VSI = 0V -20 -8 -3 µA
OUT1 exceeding VRT
OUT1 exceeding VRT
A
A
A
Ω
4/11
APPLICATIONCIRCUIT
L4936E
(Note 8)
100K
15V
for
example
BZX97C15
C
VS1
S
VS2
EN
PR
SI
1.23V
REG1
REG2
RESET
SENSE
1.23V
1.23V REFERENCE
1.23V
1.4V
D94AT079A
OUT1
OUT2
ADJ
CT
RES
SO
GND
C
C
CT (Note 7)
V
OUT1
R
SO
O1
O2
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 systemsin automotiveapplications. Nevertheless, it is suitable also in otherapplicationswhere
two stabilized voltages are required. The modular
approach of this device allows to get easly also
other featuresand 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 interruptiondue to overvoltagepulses is generated.
In the standby mode when the output 2 is disabled, thecurrent consumptionof the device (qui-
escent current) is less than 90µA (14V supply
voltage).
To reduce the quiescent current peak in the undervoltage region and to improve the transientresponse 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.
Output2 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
OUT2
.
V
OUT2
R
1E
ADJ
1.23V
R
R
1i
2i
R
ADJ
total 100K
typical
-
+
D94AT080
R
2E
5/11
L4936E
The output 2 regulator can be switches OFF via
the enable input.
Connecting a resistordivider R
1E,R2E
to the ADJ,
OUT2 pin the output voltage 2 can be programmed to the value of
with R
= V
V
OUT2
OUT1
1 +
= 60K to 150K and V
ADJ
R1E(R2E+ R
R
• R
2E
OUT1
ADJ
ADJ
= 4.95 to
)
5.05V.
For an exact calculation the temperature coefficient (Tc -2000pprm) of the internal resistor
) mustbe takeninto account.Pin ADJin this
(R
ADJ
mode should not have a capacitive burden because this would reduce the phase margin of the
regulatorloop.
Reset circuit
The reset circuit supervises the standby output
voltage. The reset output (RES) is defined from
≥ 1V.
V
OUT
Even if V
plied by theoutput voltage V
is lacking, the reset generator is sup-
S
OUT1
.
The reset threshold of 4.7V isdefined with the internal reference voltage (note9) 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 resistorfrom pin PR to GND.
The value of the programming resistor R
PR
can
be calculatedwith:
22K
=
R
PR
4.7V
V
−92.9K,3.8V ≤
−1
RT
V
4.7V
≤
RT
The reset pulse delay time tRD, is defined with the
charge time of an externalcapacitor C
•0.6V
C
t
RDmin
t
RDnom
T
=
1µA
C
T
=
1µA
•1.4V
(note5)
(note 6)
:
T
The reaction time of the reset circuit originates
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
generatedfor standby output voltage drops longer
than approximately50µs.
The minimum reset time is generated if reset condition only occures for a short time triggering a reset pulse but not completely discharging C
. The
T
reset can be related to output2 on request. If
higher charge currents for the reset capacitor are
required a resistorsfrom PinC
to OUT1, may be
T
used to increase the current. We recommended
the use of 10KΩ to 5V as an outputpull up.
Sense Comparator
The sense comparator compares an input signal
with an internalvoltage referenceof typical 1.23V.
The use of an externalvoltage divider makes this
comparator very flexible in the application. It can
be used to supervise the input voltage either before or after the protectiondiode and to giveadditional information to the microprocessor like low
voltage warnings. We recommended the use of
10KΩ to 5V as an output pull up.
Note 9:
The referenceis alternativelysupplied from V
is present, the reference is operating.
orV
S
.Ifone supply
OUT1
ThermalProtection
Both outputs are provided with an overtemperature shut down regulation power dissipation down
to uncritical values.
Output2 will shut down approximately 10Kbefore
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 chipbalance.
TransientSensitivity
In proper operation(V
supplied by V
thus reducing sensitivity to in-
OUT1
> 4.5V) the reference is
OUT
put transients.
Precise Data will be issued as soon as samples
are available.
6/11
L4936E
Figure 3:
PR
Reset Generator
74K
VOUT1
REG
17K
REF
1.23V
OUT1
1µA
-
RES
10...100K
+
Low threshold V
at 1µA=0.5V at 25°C
BE
High threshold =1.4
CT
CT
D94AT081
Figure 4:
7/11
L4936E
INPUT PROTECTION
The Inputs Enable (EN) and sense in(SI) are pro-
Figure 5:
tected against negative transients. Figure 5 is
showing thesimplified schematic
Input Characteristicsof SI, EN:
8/11
L4936E
DIM.
Dia1 3.65 3.85 0.144 0.152
MIN. TYP. MAX. MIN. TYP. MAX.
A5
B 2.65 0.104
C 1.6 0.063
D 1 0.039
E 0.49 0.55 0.019 0.022
F 0.66 0.75 0.026 0.030
G 1.02 1.27 1.52 0.040 0.050 0.060
G1 17.53 17.78 18.03 0.690 0.700 0.710
H1 19.6 0.772
H2 20.2 0.795
L 21.9 22.2 22.5 0.862 0.874 0.886
L1 21.7 22.1 22.5 0.854 0.870 0.88
L2 17.65 18.1 0.695
L3 17.25 17.5 17.75 0.679 0.689 0.699
L4 10.3 10.7 10.9 0.406 0.421 0.429
L7 2.65 2.9 0.104 0.114
M 4.25 4.55 4.85 0.167 0.179 0.191
M1 4.63 5.08 5.53 0.182 0.200 0.218
S 1.9 2.6 0.075 0.102
S1 1.9 2.6 0.075 0.102
mm inch
0.197
0.713
OUTLINE AND
MECHANICAL DATA
6
Multiwatt15 V
9/11
L4936E
DIM.
Dia1 3.65 3.85 0.144 0.152
MIN. TYP. MAX. MIN. TYP. MAX.
A 5 0.197
B 2.65 0.104
C 1.6 0.063
D 1 0.039
E 0.49 0.55 0.019 0.022
F 0.88 0.95 0.035 0.037
G 1.45 1.7 1.95 0.057 0.067 0.077
G1 16.75 17 17.25 0.659 0.669 0.679
H1 19.6 0.772
H2 20.2 0.795
L 21.9 22.2 22.5 0.862 0.874 0.886
L1 21.7 22.1 22.5 0.854 0.87 0.886
L2 17.4 18.1 0.685 0.713
L3 17.25 17.5 17.75 0.679 0.689 0.699
L4 10.3 10.7 10.9 0.406 0.421 0.429
L7 2.65 2.9 0.104 0.114
M 4.25 4.55 4.85 0.167 0.179 0.191
M1 4.73 5.08 5.43 0.186 0.200 0.214
S 1.9 2.6 0.075 0.102
S1 1.9 2.6 0.075 0.102
mm inch
OUTLINEAND
MECHANICALDATA
Multiwatt11 V
10/11
L4936E
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11/11
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