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National Semiconductor
National Semiconductor

LM2984CT Datasheet

LM2984C Microprocessor Power Supply System


LM2984CT Datasheet Preview


May 1989
LM2984C Microprocessor Power Supply System
General Description
The LM2984C positive voltage regulator features three in-
dependent and tracking outputs capable of delivering the
power for logic circuits peripheral sensors and standby
memory in a typical microprocessor system The LM2984C
includes circuitry which monitors both its own high-current
output and also an external mP If any error conditions are
sensed in either a reset error flag is set and maintained until
the malfunction terminates Since these functions are in-
cluded in the same package with the three regulators a
great saving in board space can be realized in the typical
microprocessor system The LM2984C also features very
low dropout voltages on each of its three regulator outputs
(0 6V at the rated output current) Furthermore the quies-
cent current can be reduced to 1 mA in the standby mode
Designed also for vehicular applications the LM2984C and
all regulated circuitry are protected from reverse battery in-
stallations or 2-battery jumps Familiar regulator features
such as short circuit and thermal overload protection are
also provided Fixed outputs of 5V are available in the plas-
tic TO-220 power package
Features
Y Three low dropout tracking regulators
Y Output current in excess of 500 mA
Y Low quiescent current standby regulator
Y Microprocessor malfunction RESET flag
Y Delayed RESET on power-up
Y Accurate pretrimmed 5V outputs
Y Reverse battery protection
Y Overvoltage protection
Y Reverse transient protection
Y Short circuit protection
Y Internal thermal overload protection
Y ON OFF switch for high current outputs
Y 100% electrical burn-in in thermal limit
Typical Application Circuit
LM2984C
Order Number LM2984CT
See NS Package Number TA11B
COUT must be at least 10 mF to
maintain stability May be increased
without bound to maintain regulation
during transients Locate as close as
possible to the regulator This capac- TL H 8821–1
itor must be rated over the same op-
erating temperature range as the
regulator The equivalent series re-
sistance (ESR) of this capacitor is
critical see curve
C1995 National Semiconductor Corporation TL H 8821
RRD-B30M115 Printed in U S A
Page 1

Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Input Voltage
Survival Voltage (k100 ms)
Operational Voltage
35V
26V
Internal Power Dissipation
Internally Limited
Operating Temperature Range (TA)
0 C to a125 C
Maximum Junction Temperature (Note 1)
150 C
Storage Temperature Range
b65 C to a150 C
Lead Temperature (Soldering 10 sec )
230 C
ESD rating is to be determined
Electrical Characteristics
VIN e 14V IOUT e 5 mA COUT e 10 mF Tj e 25 C (Note 6) unless otherwise indicated
Parameter
Conditions
Typical
Tested
Limit
(Note 2)
VOUT (Pin 11)
Output Voltage
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
Output Noise Voltage
Long Term Stability
5 mA s Io s 500 mA
6V s VIN s 26V
9V s VIN s 16V
7V s VIN s 26V
5 mA s IOUT s 500 mA
250 mAdc and 10 mArms
fo e 120 Hz
IOUT e 500 mA
IOUT e 250 mA
10 Hz – 100 kHz IOUT e 100 mA
5 00
2
5
12
24
38
14
100
20
4 85
5 15
25
50
50
100
50
Ripple Rejection
Dropout Voltage
Current Limit
fo e 120 Hz
IOUT e 500 mA
IOUT e 250 mA
70 60
0 53 0 80
0 28 0 50
0 92 0 75
Maximum Operational
Input Voltage
Continuous DC
32 26
Maximum Line Transient
Reverse Polarity
Input Voltage DC
VOUT s 6V ROUT e 100X
VOUT t b0 6V ROUT e 100X
45
b30
35
b15
Reverse Polarity Input
Voltage Transient
T s 100 ms ROUT e 100X
b55
b35
Design
Limit
(Note 3)
4 75
5 25
1 00
0 60
26
35
b15
b35
Units
Vmin
Vmax
mVmax
mVmax
mVmax
mX
mAmax
mAmax
mV
mV 1000 hr
dBmin
Vmax
Vmax
Amin
Vmin
Vmin
Vmin
Vmin
2
Page 2

Electrical Characteristics (Continued)
VIN e 14V Ibuf e 5 mA Cbuf e 10 mF Tj e 25 C (Note 6) unless otherwise indicated
Parameter
Conditions
Typical
Tested
Limit
(Note 2)
Vbuffer (Pin 10)
Output Voltage
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
Output Noise Voltage
Long Term Stability
5 mA s Io s 100 mA
6V s VIN s 26V
9V s VIN s 16V
7V s VIN s 26V
5 mA s Ibuf s 100 mA
50 mAdc and 10 mArms
Ibuf e 100 mA
10 Hz – 100 kHz IOUT e 100 mA
5 00
2
5
15
200
80
100
20
4 85
5 15
25
50
50
15 0
Ripple Rejection
Dropout Voltage
Current Limit
fo e 120 Hz
Ibuf e 100 mA
70 60
0 35 0 50
0 23 0 15
Maximum Operational
Input Voltage
Continuous DC
32 26
Maximum Line
Transient
Vbuf s 6V Rbuf e 100X
45 35
Reverse Polarity
Input Voltage DC
Vbuf t b0 6V Rbuf e 100X
b30
b15
Reverse Polarity Input
Voltage Transient
T s 100 ms Rbuf e 100X
b55
b35
Design
Limit
(Note 3)
4 75
5 25
0 60
26
35
b15
b35
Units
Vmin
Vmax
mVmax
mVmax
mVmax
mX
mAmax
mV
mV 1000 hr
dBmin
Vmax
Amin
Vmin
Vmin
Vmin
Vmin
Electrical Characteristics
VIN e 14V Istby e 1 mA Cstby e 10 mF Tj e 25 C (Note 6) unless otherwise indicated
Parameter
Conditions
Typical
Tested
Limit
(Note 2)
Vstandby (Pin 9)
Output Voltage
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
1 mA s Io s 7 5 mA
6V s VIN s 26V
9V s VIN s 16V
7V s VIN s 26V
0 5 mA s Istby s 7 5 mA
5 mAdc and 1 mArms fo e 120 Hz
Istby e 7 5 mA
Istby e 2 mA
5 00
2
5
6
09
12
09
4 85
5 15
25
50
50
20
15
Design
Limit
(Note 3)
4 75
5 25
Units
Vmin
Vmax
mVmax
mVmax
mVmax
X
mAmax
mAmax
3
Page 3
Part Number LM2984CT
Manufactur National Semiconductor
Description LM2984C Microprocessor Power Supply System
Total Page 14 Pages
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