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National Semiconductor
National Semiconductor

LM2984T Datasheet

Microprocessor Power Supply System


LM2984T Datasheet Preview


April 1998
LM2984
Microprocessor Power Supply System
General Description
The LM2984 positive voltage regulator features three inde-
pendent and tracking outputs capable of delivering the
power for logic circuits, peripheral sensors and standby
memory in a typical microprocessor system. The LM2984 in-
cludes circuitry which monitors both its own high-current out-
put and also an external µP. 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 mi-
croprocessor system. The LM2984 also features very low
dropout voltages on each of its three regulator outputs (0.6V
at the rated output current). Furthermore, the quiescent cur-
rent can be reduced to 1 mA in the standby mode.
Designed also for vehicular applications, the LM2984 and all
regulated circuitry are protected from reverse battery instal-
lations or 2-battery jumps. Familiar regulator features such
as short circuit and thermal overload protection are also pro-
vided. Fixed outputs of 5V are available in the plastic TO-220
power package.
Features
n Three low dropout tracking regulators
n Output current in excess of 500 mA
n Fully specified for −40˚C to +125˚C operation
n Low quiescent current standby regulator
n Microprocessor malfunction RESET flag
n Delayed RESET on power-up
n Accurate pretrimmed 5V outputs
n Reverse battery protection
n Overvoltage protection
n Reverse transient protection
n Short circuit protection
n Internal thermal overload protection
n ON/OFF switch for high current outputs
n P+ Product Enhancement tested
Typical Application Circuit
DS011252-1
COUT must be at least 10 µF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to
the regulator. This capacitor must be rated over the same operating temperature range as the regulator. The equivalent series resistance (ESR) of this
capacitor is critical; see curve.
Order Number LM2984T
See NS Package Number TA11B
© 1998 National Semiconductor Corporation DS011252
www.national.com
Page 1

Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage
Survival Voltage (<100 ms)
Operational Voltage
Internal Power Dissipation
60V
26V
Internally Limited
Operating Temperature Range (TA)
Maximum Junction Temperature
(Note 3)
Storage Temperature Range
Lead Temperature
(Soldering, 10 sec.)
ESD Susceptability (Note 5)
−40˚C to +125˚C
150˚C
−65˚C to +150˚C
230˚C
2000V
Electrical Characteristics
VIN = 14V, IOUT = 5 mA, COUT = 10 µF, unless otherwise indicated. Boldface type refers to limits over the entire operating
temperature range, −40˚C TA +125˚C, all other limits are for TA = Tj = 25˚C (Note 8) .
Parameter
Conditions
Typical
Limit
Units
(Note 4)
VOUT (Pin 11)
Output Voltage
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
Output Noise Voltage
Long Term Stability
5 mA IO 500 mA
6V VIN 26V
9V VIN 16V
7V VIN 26V
5 mA IOUT 500 mA
250 mAdc and 10 mArms,
fo = 120 Hz
IOUT = 500 mA
IOUT = 250 mA
10 Hz–100 kHz, IOUT = 100 mA
5.00
2
5
12
24
38
14
100
20
4.85/4.75
5.15/5.25
25/25
50/50
50/50
100/100
50/50
Vmin
Vmax
mVmax
mVmax
mVmax
m
mAmax
mAmax
µV
mV/1000 hr
Ripple Rejection
Dropout Voltage
Current Limit
fo = 120 Hz
IOUT = 500 mA
IOUT = 250 mA
70 60/50
0.53
0.80/1.1
0.28
0.50/0.70
0.92
0.75/0.60
dBmin
Vmax
Vmax
Amin
Maximum Operational
Continuous DC
32 26/26
Vmin
Input Voltage
Maximum Line Transient
Reverse Polarity
Input Voltage DC
VOUT 6V, ROUT = 100, T 100 ms
VOUT −0.6V, ROUT = 100
65 60/60
−30 −15/−15
Vmin
Vmin
Reverse Polarity Input
Voltage Transient
T 100 ms, ROUT = 100
−55 −35/−35
Vmin
Electrical Characteristics
VIN = 14V, Ibuf = 5 mA, Cbuf = 10 µF, unless otherwise indicated. Boldface type refers to limits over the entire operating tem-
perature range, −40˚C TA +125˚C, all other limits are for TA = Tj = 25˚C (Note 8) .
Parameter
Conditions
Typical
Limit
Units
(Note 4)
Vbuffer (Pin 10)
Output Voltage
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
5 mA IO 100 mA
6V VIN 26V
9V VIN 16V
7V VIN 26V
5 mA Ibuf 100 mA
50 mAdc and 10 mArms,
fO = 120 Hz
Ibuf = 100 mA
5.00
4.85/4.75
5.15/5.25
2 25/25
5 50/50
15 50/50
200
8.0 15/15
Vmin
Vmax
mVmax
mVmax
mVmax
m
mAmax
www.national.com
2
Page 2

Electrical Characteristics (Continued)
VIN = 14V, Ibuf = 5 mA, Cbuf = 10 µF,
perature range, −40˚C TA +125˚C,
unless otherwise indicated.
all other limits are for TA =
Boldface
Tj = 25˚C
type refers
(Note 8) .
to
limits
over
the
entire
operating
tem-
Parameter
Conditions
Typical
Limit
Units
(Note 4)
Vbuffer (Pin 10)
Output Noise Voltage
Long Term Stability
10 Hz–100 kHz, IOUT = 100 mA
100
20
µV
mV/1000 hr
Ripple Rejection
Dropout Voltage
Current Limit
fo = 120 Hz
Ibuf = 100 mA
70 60/50
0.35
0.50/0.80
0.23
0.15/0.15
dBmin
Vmax
Amin
Maximum Operational
Continuous DC
32 26/26
Vmin
Input Voltage
Maximum Line
Transient
Vbuf 6V, Rbuf = 100,
T 100 ms
65 60/60
Vmin
Reverse Polarity
Input Voltage DC
Vbuf −0.6V, Rbuf = 100
−30 −15/−15
Vmin
Reverse Polarity Input
Voltage Transient
T 100 ms, Rbuf = 100
−55 −35/−35
Vmin
Electrical Characteristics
VIN = 14V, Istby = 1 mA, Cstby = 10 µF, unless otherwise indicated. Boldface type refers to limits over the entire operating tem-
perature range, −40˚C TA +125˚C, all other limits are for TA = Tj = 25˚C (Note 8) .
Parameter
Conditions
Typical
Limit
Units
(Note 4)
Vstandby (Pin 9)
Output Voltage
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
Output Noise Voltage
Long Term Stability
1 mA IO 7.5 mA
6V VIN 26V
9V VIN 16V
7V VIN 26V
0.5 mA IOUT 7.5 mA
5 mAdc and 1 mArms, fo = 120 Hz
Istby = 7.5 mA
Istby = 2 mA
10 Hz–100 kHz, Istby = 1 mA
5.00
2
5
6
0.9
1.2
0.9
100
20
4.85/4.75
5.15/5.25
25/25
50/50
50/50
2.0/4.0
1.5/4.0
Vmin
Vmax
mVmax
mVmax
mVmax
mAmax
mAmax
µV
mV/1000 hr
Ripple Rejection
Dropout Voltage
Current Limit
Maximum Operational
Input Voltage
Maximum Line
Transient
Reverse Polarity
Input Voltage DC
Reverse Polarity Input
Voltage Transient
fo = 120 Hz
Istby = 1 mA
Istby = 7.5 mA
4.5V Vstby 6V,
Rstby = 1000
Vstby 6V, T 100 ms,
Rstby = 1000
Vstby −0.6V,
Rstby = 1000
T 100 ms, Rstby = 1000
70
0.26
0.38
15
65
65
−30
−55
60/50
0.50/0.60
0.60/0.70
12/12
60/60
60/60
−15/−15
−35/−35
dBmin
Vmax
Vmax
mAmin
Vmin
Vmin
Vmin
Vmin
3 www.national.com
Page 3
Part Number LM2984T
Manufactur National Semiconductor
Description Microprocessor Power Supply System
Total Page 16 Pages
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