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LM2984C Microprocessor Power Supply System
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
m
P. 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
C
OUT
must be at least 10
m
Fto
maintain stability. May be increased
without bound to maintain regulation
during transients. Locate as close as
possible to the regulator. This capac-
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.
TL/H/8821±1
Order Number LM2984CT
See NS Package Number TA11B
C
1995 National Semiconductor Corporation
TL/H/8821
RRD-B30M115/Printed in U. S. A.
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 (
k
100 ms)
Internal Power Dissipation
Internally Limited
Operating Temperature Range (T
A
)
0
§
Cto
a
125
§
C
Maximum Junction Temperature (Note 1)
150
§
C
35V
Storage Temperature Range
b
65
§
Cto
a
150
§
C
Lead Temperature (Soldering, 10 sec.)
230
§
C
Operational Voltage
26V
ESD rating is to be determined.
Electrical Characteristics
V
IN
e
14V, I
OUT
e
5 mA, C
OUT
e
10
m
F, T
j
e
25
§
C (Note 6) unless otherwise indicated
Tested Design
Parameter
Conditions
Typical
Limit
Limit
Units
(Note 2)
(Note 3)
V
OUT
(Pin 11)
Output Voltage
5 mA
s
I
o
s
500 mA
5.00
4.85
4.75
V
min
6V
s
V
IN
s
26V
5.15
5.25
V
max
Line Regulation
9V
s
V
IN
s
16V
2
25
mV
max
7V
s
V
IN
s
26V
5
50
mV
max
Load Regulation
5 mA
s
I
OUT
s
500 mA
12
50
mV
max
Output Impedance
250 mA
dc
and 10 mA
rms
,
24
m
X
f
o
e
120 Hz
Quiescent Current
I
OUT
e
500 mA
38
100
mA
max
I
OUT
e
250 mA
14
50
mA
max
Output Noise Voltage
10 Hz±100 kHz, I
OUT
e
100 mA
100
m
V
Long Term Stability
20
mV/1000 hr
Ripple Rejection
f
o
e
120 Hz
70
60
dB
min
Dropout Voltage
I
OUT
e
500 mA
0.53
0.80
1.00
V
max
I
OUT
e
250 mA
0.28
0.50
0.60
V
max
Current Limit
0.92
0.75
A
min
Maximum Operational
Continuous DC
32
26
26
V
min
Input Voltage
Maximum Line Transient V
OUT
s
6V, R
OUT
e
100
X
45
35
35
V
min
Reverse Polarity
V
OUT
t b
0.6V, R
OUT
e
100
X
b
30
b
15
b
15
V
min
Input Voltage DC
Reverse Polarity Input
T
s
100 ms, R
OUT
e
100
X
b
55
b
35
b
35
V
min
Voltage Transient
2
Electrical Characteristics
(Continued)
V
IN
e
14V, I
buf
e
5 mA, C
buf
e
10
m
F, T
j
e
25
§
C (Note 6) unless otherwise indicated
Tested
Design
Parameter
Conditions
Typical
Limit
Limit
Units
(Note 2)
(Note 3)
V
buffer
(Pin 10)
Output Voltage
5 mA
s
I
o
s
100 mA
5.00
4.85
4.75
V
min
6V
s
V
IN
s
26V
5.15
5.25
V
max
Line Regulation
9V
s
V
IN
s
16V
2
25
mV
max
7V
s
V
IN
s
26V
5
50
mV
max
Load Regulation
5 mA
s
I
buf
s
100 mA
15
50
mV
max
Output Impedance
50 mA
dc
and 10 mA
rms
,
200
m
X
Quiescent Current
I
buf
e
100 mA
8.0
15.0
mA
max
Output Noise Voltage
10 Hz±100 kHz, I
OUT
e
100 mA
100
m
V
Long Term Stability
20
mV/1000 hr
Ripple Rejection
f
o
e
120 Hz
70
60
dB
min
Dropout Voltage
I
buf
e
100 mA
0.35
0.50
0.60
V
max
Current Limit
0.23
0.15
A
min
Maximum Operational Continuous DC
32
26
26
V
min
Input Voltage
Maximum Line
V
buf
s
6V, R
buf
e
100
X
45
35
35
V
min
Transient
Reverse Polarity
V
buf
t b
0.6V, R
buf
e
100
X
b
30
b
15
b
15
V
min
Input Voltage DC
Reverse Polarity Input
T
s
100 ms, R
buf
e
100
X
b
55
b
35
b
35
V
min
Voltage Transient
Electrical Characteristics
V
IN
e
14V, I
stby
e
1 mA, C
stby
e
10
m
F, T
j
e
25
§
C (Note 6) unless otherwise indicated
Tested
Design
Parameter
Conditions
Typical
Limit
Limit
Units
(Note 2)
(Note 3)
V
standby
(Pin 9)
Output Voltage
1 mA
s
I
o
s
7.5 mA
5.00
4.85
4.75
V
min
6V
s
V
IN
s
26V
5.15
5.25
V
max
Line Regulation
9V
s
V
IN
s
16V
2
25
mV
max
7V
s
V
IN
s
26V
5
50
mV
max
Load Regulation
0.5 mA
s
I
stby
s
7.5 mA
6
50
mV
max
Output Impedance
5 mA
dc
and1mA
rms
,f
o
e
120 Hz
0.9
X
Quiescent Current
I
stby
e
7.5 mA
1.2
2.0
mA
max
I
stby
e
2 mA
0.9
1.5
mA
max
3
Electrical Characteristics
(Continued)
V
IN
e
14V, I
stby
e
1 mA, C
stby
e
10
m
F, T
j
e
25
§
C (Note 6) unless otherwise indicated
Tested
Design
Parameter
Conditions
Typical
Limit
Limit
Units
(Note 2)
(Note 3)
V
standby
(Continued)
Output Noise Voltage
10 Hz±100 kHz, I
stby
e
1 mA
100
m
V
Long Term Stability
20
mV/1000 hr
Ripple Rejection
f
o
e
120 Hz
70
60
dB
min
Dropout Voltage
I
stby
e
1 mA
0.26
0.50
0.50
V
max
Dropout Voltage
I
stby
e
7.5 mA
0.38
0.60
0.70
V
max
Current Limit
15
12
mA
min
Maximum Operational
4.5V
s
V
stby
s
6V
45
35
35
V
min
Input Voltage
R
stby
e
1000
X
Maximum Line
V
stby
s
6V,
45
35
35
V
min
Transient
R
stby
e
1000
X
Reverse Polarity
V
stby
t b
0.6V,
b
30
b
15
b
15
V
min
Input Voltage DC
R
stby
e
1000
X
Reverse Polarity Input
T
s
100 ms, R
stby
e
1000
X
b
55
b
35
b
35
V
min
Voltage Transient
Electrical Characteristics
V
IN
e
14V, T
j
e
25
§
C (Note 6) C
OUT
e
10
m
F, C
buf
e
10
m
F, C
stby
e
10
m
F unless otherwise specified
Tested
Design
Parameter
Conditions
Typical
Limit
Limit
Units
(Note 2)
(Note 3)
Tracking and Isolation
Tracking
I
OUT
s
500 mA, I
buf
e
5 mA,
g
30
g
100
mV
max
V
OUT
±V
stby
I
stby
s
7.5 mA
Tracking
I
OUT
e
5 mA, I
buf
s
100 mA,
g
30
g
100
mV
max
V
buf
±V
stby
I
stby
s
7.5 mA
Tracking
I
OUT
s
500 mA, I
buf
s
100 mA,
g
30
g
100
mV
max
V
OUT
±V
buf
I
stby
e
1mA
Isolation*
R
OUT
e
1
X
,I
buf
s
100 mA
5.00
4.50
V
min
V
buf
from V
OUT
5.50
V
max
Isolation*
R
OUT
e
1
X
,I
stby
s
7.5 mA
5.00
4.50
V
min
V
stby
from V
OUT
5.50
V
max
Isolation*
R
buf
e
1
X
,I
OUT
s
500 mA
5.00
4.50
V
min
V
OUT
from V
buf
5.50
V
max
Isolation*
R
buf
e
1
X
,I
stby
s
7.5 mA
5.00
4.50
V
min
V
stby
from V
buf
5.50
V
max
*Isolation refers to the ability of the specified output to remain within the tested limits when the other output is shorted to ground.
4
Electrical Characteristics
(Continued)
V
IN
e
14V, I
OUT
e
5 mA, I
buf
e
5 mA, I
stby
e
5 mA, R
t
e
130k, C
t
e
0.33
m
F, C
mon
e
0.47
m
F, T
j
e
25
§
C (Note 6) unless
otherwise specified
Tested
Design
Parameter
Conditions
Typical
Limit
Limit
Units
(Note 2)
(Note 3)
Computer Monitor/Reset Functions
I
reset
Low
V
IN
e
4V, V
rst
e
0.4V
5
2
1
mA
min
V
reset
Low
V
IN
e
4V, I
rst
e
1 mA
0.10
0.40
V
max
R
t voltage
(Pin 2)
1.22
1.15
V
min
1.22
1.30
V
max
Power On Reset
V
m
P
mon
e
5V
50
45
ms
min
Delay
(T
dly
e
1.2 R
t
C
t
)
50
55
ms
max
V
OUT
Low
(Note 4)
4.00
3.60
V
min
Reset Threshold
4.00
4.40
V
max
V
OUT
High
(Note 4)
5.50
5.25
V
min
Reset Threshold
5.50
6.00
V
max
Reset Output
V
m
P
mon
e
5V, V
rst
e
12V
0.01
1
m
A
max
Leakage
m
P
mon
Input
V
m
P
mon
e
2.4V
7.5
25
m
A
max
Current (Pin 4)
V
m
P
mon
e
0.4V
0.01
10
m
A
max
m
P
mon
Input
1.22
0.80
0.80
V
min
Threshold Voltage
1.22
2.00
2.00
V
max
m
P Monitor Reset
V
m
P
mon
e
0V
50
45
ms
min
Oscillator Period
(T
window
e
0.82 R
t
C
mon
)
50
55
ms
max
m
P Monitor Reset
V
m
P
mon
e
0V
1.0
0.7
0.5
ms
min
Oscillator Pulse Width
(RESET
pw
e
2000 C
mon
)
1.0
1.3
2.0
ms
max
Minimum
m
P Monitor
(Note 5)
2
m
s
max
Input Pulse Width
Reset Fall Time
R
rst
e
10k, V
rst
e
5V, C
rst
s
10 pF
0.20
1.00
m
s
max
Reset Rise Time
R
rst
e
10k, V
rst
e
5V, C
rst
s
10 pF
0.60
1.00
m
s
max
On/Off Switch Input
V
ON
e
2.4V
7.5
25
m
A
max
Current (Pin 8)
V
ON
e
0.4V
0.01
10
m
A
max
On/Off Switch Input
1.22
0.80
0.80
V
min
Threshold Voltage
1.22
2.00
2.00
V
max
Note 1: Thermal resistance without a heatsink for junction-to-case temperature is 3
§
C/W. Thermal resistance case-to-ambient is 40
§
C/W.
Note 2: Tested Limits are guaranteed and 100% production tested.
Note 3: Design Limits are guaranteed (but not 100% production tested) over the indicated temperature and supply voltage range. These limits are not used to
calculate outgoing quality levels.
Note 4: An internal comparator detects when the main regulator output (V
OUT
) drops below 4.0V or rises above 5.5V. If either condition exists at the output, the
Reset Error Flag is held low until the error condition has terminated. The Reset Error Flag is then allowed to go high again after a delay set by R
t
and C
t
. (See
Applications Section.)
Note 5: This parameter is a measure of how short a pulse can be detected at the
m
P Monitor Input. This parameter is primarily influenced by the value of C
mon
.
(See Typical Performance Characteristics and Applications Section.)
Note 6: To ensure constant junction temperature, low duty cycle pulse testing is used.
5
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