LM333
3-Ampere Adjustable Negative Regulator
General Description
The LM333 is an adjustable 3-terminal negative voltage
regulator capable of supplying in excess of -3.0A over an
output voltage range of -1.2V to -32V. This regulator is
exceptionally easy to apply, requiring only 2 external resis-
tors to set the output voltage and 1 output capacitor for
frequency compensation. The circuit design has been opti-
mized for excellent regulation and low thermal transients.
Further, the LM333 features internal current limiting, thermal
shutdown and safe-area compensation, making them sub-
stantially immune to failure from overloads.
The LM333 serves a wide variety of applications including
local on-card regulation, programmable-output voltage regu-
lation or precision current regulation. The LM333 is an ideal
complement to the LM150/LM350 adjustable positive regu-
lators.
Features
n
Output voltage adjustable from -1.2V to -32V
n
3.0A output current guaranteed, -55C to +150C
n
Line regulation typically 0.01%/V
n
Load regulation typically 0.2%
n
Excellent rejection of thermal transients
n
50 ppm/C temperature coefficient
n
Temperature-independent current limit
n
Internal thermal overload protection
n
Standard 3-lead transistor package
n
Output is short circuit protected
Connection Diagram
Typical Application
TO-3
Metal Can Package
DS009065-1
Bottom View
Steel TO-3 Metal Can Package (K STEEL)
Order Number LM333K STEEL
See NS Package Number K02A
-5.2V Regulator with Electronic Shutdown
DS009065-6
December 2000
LM333
3-Ampere
Adjustable
Negative
Regulators
2000 National Semiconductor Corporation
DS009065
www.national.com
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Dissipation
Internally Limited
Input-Output Voltage Differential
35V
Operating Junction Temperature Range
LM333
T
MIN
to T
MAX
-40C to +125C
Storage Temperature
-65C to +150C
Lead Temperature (Soldering, 10 sec.)
TO-3 Package
300C
ESD Susceptibility
TBD
Electrical Characteristics LM333
Specifications with standard typeface are for T
J
= 25C, and those with boldface type apply over the full operating tempera-
ture range. (Note 3)
Parameter
Conditions
Typical
Min
Max
Units
(Note 2)
(Note 2)
Reference Voltage
I
L
= 10 mA
-1.250
-1.225
-1.275
V
3V
|V
IN
- V
OUT
|
35V
-1.250
-1.213
-1.287
10 mA
I
L
3A, P
P
MAX
Line Regulation
3V
|V
IN
- V
OUT
|
35V
0.01
0.04
% /V
I
OUT
= 50 mA (Note 4)
0.02
0.07
Load Regulation
10 mA
I
L
3A, P
P
MAX
0.2
1.0
%
(Notes 4, 5)
0.4
1.5
Thermal Regulation
10 ms Pulse
0.002
0.02
% /W
Temperature Stability
T
MIN
T
J
T
MAX
0.5
%
Long Term Stability
T
J
= 125C, 1000 Hours
0.2
%
Adjust Pin Current
65
95
A
70
100
Adjust Pin Current
10 mA
I
L
3A
2.5
8
A
Change
3.0V
|V
IN
- V
OUT
|
35V
Minimum Load
|V
IN
- V
OUT
|
35V
2.5
10
mA
Current
|V
IN
- V
OUT
|
10V
1.5
5.0
Current Limit
3V
|V
IN
- V
OUT
|
10V
3.9
3.0
(Note 5)
|V
IN
- V
OUT
| = 20V
2.4
1.0
A
|V
IN
- V
OUT
| = 30V
0.4
0.20
Output Noise
10 Hz to 10 kHz
0.003
% (rms)
(% of V
OUT
)
Ripple Rejection
V
OUT
= 10V, f = 120 Hz
C
ADJ
=
0 F
60
dB
C
ADJ
= 10 F
77
Thermal Resistance
TO-3 Package (K STEEL)
1.2
1.8
C/W
Junction to Case
TO-220 Package (T)
3
4
Thermal Shutdown
163
C
Temperature
Thermal Resistance
K Package
35
Junction to Ambient
T Package
50
C/W
(No Heatsink)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
outside of its stated operating conditions.
Note 2: All limits are guaranteed at either room temperature (standard type face) or at temperature extremes (bold typeface) by production testing or correlation
techniques using standard Statistical Quality Control (SQC) methods.
Note 3: Unless otherwise specified: |V
IN
- V
OUT
| = 5V, I
OUT
= 0.5A, P
DISS
30W.
Note 4: Load and line regulation are measured at constant junction temperature, using low duty cycle pulse testing (output voltage changes due to heating effects
are covered by the Thermal Regulation specification). For the TO-3 package, load regulation is measured on the output pin,
1
/
8
" below the base of the package.
Note 5: The output current of the LM333 is guaranteed to be
3A in the range 3V
|V
IN
- V
OUT
|
10V. For the range 10V
|V
IN
- V
OUT
|
15V, the guaranteed
minimum output current is equal to: 30/ (V
IN
- V
OUT
). Refer to graphs for guaranteed output currents at other voltages.
LM333
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2
Guaranteed Performance Characteristics
Typical Applications
LM133 Guaranteed Output Current
DS009065-4
LM333 Guaranteed Output Current
DS009065-5
-5.2V Regulator with Electronic Shutdown
DS009065-6
Negative Regulator with Protection Diodes
DS009065-7
*
When C
L
is larger than 20 F, D1 protects the LM333 in case the input supply is shorted.
**
When C2 is larger than 10 F and -V
OUT
is larger than -25V, D2 protects the LM333 in case the output is shorted.
***
In case V
OUT
is shorted to a positive supply, D3 protects the LM333 from overvoltage, and protects the load from reversed voltage.
LM333
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3
Typical Applications
(Continued)
High-Performance 9-Ampere Adjustable Regulator
DS009065-8
*
Wire R1 and R4 to the regulator that provides the highest V
OUT
with a 3A load.
**
Full output current requires 5V
|V
IN
V
OUT
|
10V. At higher input-output voltages, load current will be less (see guaranteed curves)
Current Regulator
DS009065-9
*
0.4
R1
120
High Stability 10V Regulator
DS009065-10
LM333
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4
Typical Applications
(Continued)
High-Current Adjustable Regulator
DS009065-11
*
Control regulator must have the largest V
REF
**
Full output current requires 5V
|V
IN
V
OUT
|
10V. At higher input-output voltages, load current will be less (see guaranteed curves)
LM333
www.national.com
5
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