LM2936-5.0
Ultra-Low Quiescent Current 5V Regulator
General Description
The LM2936 ultra-low quiescent current regulator features
low dropout voltage and low current in the standby mode.
With less than 15 µA quiescent current at a 100 µA load, the
LM2936 is ideally suited for automotive and other battery
operated systems. The LM2936 retains all of the features
that are common to low dropout regulators including a low
dropout PNP pass device, short circuit protection, reverse
battery protection, and thermal shutdown. The LM2936 has
a 40V maximum operating voltage limit, a −40˚C to +125˚C
operating temperature range, and ±3% output voltage toler-
ance over the entire output current, input voltage, and tem-
perature range. The LM2936 is available in a TO-92 pack-
age, a SO-8 surface mount package, and a TO-252 surface
mount power package.
Features
nUltra low quiescent current (I
Q
≤15 µA for I
O
= 100 µA)
nFixed 5V, 50 mA output
n±2% Initial output tolerance
n±3% Output tolerance over line, load, and temperature
nDropout voltage typically 200 mV @I
O
=50mA
nReverse battery protection
n−50V reverse transient protection
nInternal short circuit current limit
nInternal thermal shutdown protection
n40V operating voltage limit
n60V operating voltage limit for LM2936HV
nShutdown Pin available with LM2936BM package
Typical Application
00975901
* Required if regulator is located more than 2" from power supply filter capacitor.
**Required for stability. Must be rated for 10 µF minimum over intended operating temperature range. Effective series resistance (ESR) is critical, see
curve. Locate capacitor as close as possible to the regulator output and ground pins. Capacitance may be increased without bound.
Connection Diagrams
TO-252 SOT-223
00975925
Top View
Order Number LM2936DT-5.0
See NS Package Number TD03B
00975926
Top View
Order Number LM2936MP-5.0
See NS Package Number MA04A
June 2002
LM2936-5.0 Ultra-Low Quiescent Current 5V Regulator
© 2002 National Semiconductor Corporation DS009759 www.national.com
Connection Diagrams (Continued)
8-Pin SO (M) 8-Pin SO (M)
00975906
Top View
Order Number LM2936M-5.0, LM2936HVMA-5.0
See NS Package Number M08A
00975927
Top View
Order Number LM2936BM-5.0, LM2936HVBMA-5.0
See NS Package Number M08A
TO-92 8-Pin Mini SOIC (MM)
00975902
Bottom View
Order Number LM2936Z-5.0
See NS Package Number Z03A 00975928
Top View
Order Number LM2936MM-5.0
See NS Package Number MUA08A
LM2936-5.0
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage (Survival) +60V, −50V
ESD Susceptibility (Note 2) 2000V
Power Dissipation (Note 3) Internally limited
Junction Temperature (T
Jmax
) 150˚C
Storage Temperature Range −65˚C to +150˚C
Lead Temperature (Soldering, 10
sec.) 260˚C
Operating Ratings
Operating Temperature Range −40˚C to +125˚C
Maximum Operating Input Voltage -
LM2936 +40V
Maximum Operating Input Voltage -
LM2936HV only +60V
Maximum Shutdown Pin Voltage -
LM2936BM only
0V to 40V
TO-92 (Z03A) θ
JA
195˚C/W
MSO-8 (MUA08A) θ
JA
200˚C/W
SO-8 (M08A) θ
JA
140˚C/W
SO-8 (M08A) θ
JC
45˚C/W
TO-252 (TD03B) θ
JA
136˚C/W
TO-252 (TD03B) θ
JC
6˚C/W
SOT-223 (MA04A) θ
JA
149˚C/W
SOT-223 (MA04A) θ
JC
36˚C/W
Electrical Characteristics
V
IN
= 14V, I
O
= 10 mA, T
J
= 25˚C, unless otherwise specified. Boldface limits apply over entire operating temperature range
Parameter Conditions Min
(Note 5)
Typical
(Note 4)
Max
(Note 5) Units
LM2936HV Only
Output Voltage 5.5V ≤V
IN
≤48V,
100 µA ≤I
O
≤50 mA (Note 6) 4.85 5.00 5.15 V
Line Regulation 6V ≤V
IN
≤60V, I
O
= 1mA 15 35 mV
All LM2936
Output Voltage
4.90 5.00 5.10
V
5.5V ≤V
IN
≤26V,
100 µA ≤I
O
≤50 mA (Note 6)
4.85 5.00 5.15
Quiescent Current I
O
= 100 µA, 8V ≤V
IN
≤24V 9 15 µA
I
O
= 10 mA, 8V ≤V
IN
≤24V 0.20 0.50 mA
I
O
= 50 mA, 8V ≤V
IN
≤24V 1.5 2.5 mA
Line Regulation 9V ≤V
IN
≤16V 5 10 mV
6V ≤V
IN
≤40V, I
O
= 1 mA 10 30
Load Regulation 100 µA ≤I
O
≤5mA 10 30 mV
5mA≤I
O
≤50 mA 10 30
Dropout Voltage I
O
= 100 µA 0.05 0.10 V
I
O
= 50 mA 0.20 0.40 V
Short Circuit Current V
O
= 0V 65 120 250 mA
Output Impedance I
O
= 30 mAdc and 10 mArms, 450 mΩ
f
= 1000 Hz
Output Noise Voltage 10 Hz–100 kHz 500 µV
Long Term Stability 20 mV/1000
Hr
Ripple Rejection V
ripple
=1V
rms
,
fripple
= 120 Hz −40 −60 dB
Reverse Polarity R
L
= 500Ω, T = 1 ms −50 −80 V
Transient Input Voltage
Output Voltage with V
IN
= −15V, R
L
= 500Ω0.00 −0.30 V
Reverse Polarity Input
Maximum Line Transient R
L
= 500Ω,V
O
≤5.5V, T = 40ms 60 V
LM2936-5.0
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Electrical Characteristics (Continued)
V
IN
= 14V, I
O
= 10 mA, T
J
= 25˚C, unless otherwise specified. Boldface limits apply over entire operating temperature range
Parameter Conditions Min
(Note 5)
Typical
(Note 4)
Max
(Note 5) Units
Output Bypass
Capacitance (C
OUT
) ESR
C
OUT
= 10µF
0.1mA ≤I
OUT
≤50mA 0.3 8 Ω
Shutdown Input − LM2936BM Only
Output Voltage, V
OUT
Output Off, V
SD
=2.4V, R
LOAD
= 500Ω0 0.010 V
Shutdown High
Threshold Voltage, V
IH
Output Off, R
LOAD
= 500Ω2.00 1.1 V
Shutdown Low
Threshold Voltage, V
IL
Output On, R
LOAD
= 500Ω1.1 0.60 V
Shutdown High
Current, I
IH
Output Off, V
SD
= 2.4V, R
LOAD
= 500Ω12 µA
Quiescent Current Output Off, V
SD
= 2.4V, R
LOAD
= 500Ω
Includes I
IH
Current
30 µA
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating
the device beyond its specified operating ratings.
Note 2: Human body model, 100 pF discharge through a 1.5 kΩresistor.
Note 3: The maximum power dissipation is a function of TJmax,θJA, and TA. The maximum allowable power dissipation at any ambient temperature is
PD=(T
Jmax −T
A)/θJA. If this dissipation is exceeded, the die temperature will rise above 150˚C and the LM2936 will go into thermal shutdown.
Note 4: Typicals are at 25˚C (unless otherwise specified) and represent the most likely parametric norm.
Note 5: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 6: To ensure constant junction temperature, pulse testing is used.
Typical Performance Characteristics
Maximum Power
Dissipation (TO-92) Dropout Voltage
00975907 00975908
LM2936-5.0
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Typical Performance Characteristics (Continued)
Dropout Voltage Quiescent Current
00975909 00975910
Quiescent Current Quiescent Current
00975911 00975912
Quiescent Current Quiescent Current
00975913 00975914
LM2936-5.0
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Typical Performance Characteristics (Continued)
Output Capacitor ESR Peak Output Current
00975915 00975916
Peak Output Current Current Limit
00975917 00975918
Line Transient Response
Output at
Voltage Extremes
00975919 00975920
LM2936-5.0
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Typical Performance Characteristics (Continued)
Ripple Rejection Load Transient Response
00975921 00975922
Low Voltage Behavior Output Impedance
00975923 00975924
LM2936-5.0
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Applications Information
Unlike other PNP low dropout regulators, the LM2936 re-
mains fully operational to 40V. Owing to power dissipation
characteristics of the available packages, full output current
cannot be guaranteed for all combinations of ambient tem-
perature and input voltage. As an example, consider an
LM2936Z operating at 25˚C ambient. Using the formula for
maximum allowable power dissipation given in (Note 3) , we
find that P
Dmax
= 641 mW at 25˚C. Including the small
contribution of the quiescent current to total power dissipa-
tion the maximum input voltage (while still delivering 50 mA
output current) is 17.3V. The LM2936Z will go into thermal
shutdown if it attempts to deliver full output current with an
input voltage of more than 17.3V. Similarly, at 40V input and
25˚C ambient the LM2936Z can deliver 18 mA maximum.
Under conditions of higher ambient temperatures, the volt-
age and current calculated in the previous examples will
drop. For instance, at the maximum ambient of 125˚C the
LM2936Z can only dissipate 128 mW, limiting the input
voltage to 7.34V for a 50 mA load, or 3.5 mA output current
for a 40V input.
The junction to ambient thermal resistance θ
JA
rating has
two distinct components: the junction to case thermal resis-
tance rating θ
JC
; and the case to ambient thermal resistance
rating θ
CA
. The relationship is defined as: θ
JA
=θ
JC
+θ
CA
.
For the SO-8 and TO-252 surface mount packages the θ
JA
rating can be improved by using the copper mounting pads
on the printed circuit board as a thermal conductive path to
extract heat from the package.
On the SO-8 package the four ground pins are thermally
connected to the backside of the die. Adding approximately
0.04 square inches of 2 oz. copper pad area to these four
pins will improve the θ
JA
rating to approximately 110˚C/W. If
this extra pad are is placed directly beneath the package
there should not be any impact on board density.
On the TO-252 package the ground tab is thermally con-
nected to the backside of the die. Adding 1 square inch of 2
oz. copper pad area directly under the ground tab will im-
prove the θ
JA
rating to approximately 50˚C/W.
While the LM2936 has an internally set thermal shutdown
point of typically 150˚C, this is intended as a safety feature
only. Continuous operation near the thermal shutdown tem-
perature should be avoided as it may have a negative affect
on the life of the device.
While the LM2936 maintains regulation to 60V, it will not
withstand a short circuit above 40V because of safe operat-
ing area limitations in the internal PNP pass device. Above
60V the LM2936 will break down with catastrophic effects on
the regulator and possibly the load as well. Do not use this
device in a design where the input operating voltage may
exceed 40V, or where transients are likely to exceed 60V.
Shutdown Pin
The LM2936BM has a pin for shutting down the regulator
output. Applying a Logic Level High (>2.0V) to the Shutdown
pin will cause the output to turn off. Leaving the Shutdown
pin open, connecting it to Ground, or applying a Logic Level
Low (<0.6V) will allow the regulator output to turn on.
LM2936-5.0
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Equivalent Schematic Diagram
00975905
LM2936-5.0
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Physical Dimensions inches (millimeters)
unless otherwise noted
8-Lead Small Outline Molded Package (M)
NS Package Number M08A
TO-252 Package (DT)
NS Package Number TD03B
LM2936-5.0
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
3-Lead TO-92 Plastic Package (Z)
NS Package Number Z03A
SOT-223 Package (MP)
NS Package Number MA04A
LM2936-5.0
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
8-Lead Mini SOIC package (MM)
NS Package Number MUA08A
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LM2936-5.0 Ultra-Low Quiescent Current 5V Regulator
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
