LM133/LM333
3-Ampere Adjustable Negative Regulators
General Description
The LM133/LM333 are adjustable 3-terminal negative volt-
age regulators capable of supplying in excess of -3.0A over
an output voltage range of -1.2V to -32V. These regulators
are exceptionally easy to apply, requiring only 2 external re-
sistors 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 LM133 series features internal current limiting,
thermal shutdown and safe-area compensation, making
them substantially immune to failure from overloads.
The LM133/LM333 serve a wide variety of applications in-
cluding local on-card regulation, programmable-output volt-
age regulation or precision current regulation. The LM133/
LM333 are ideal complements to the LM150/LM350
adjustable positive regulators.
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
P
+
Product Enhancement tested
n
Standard 3-lead transistor package
n
Output is short circuit protected
Connection Diagrams
TO-3
Metal Can Package
DS009065-1
Bottom View
Steel TO-3 Metal Can Package (K STEEL)
Order Number LM133K STEEL or
LM333K STEEL
See NS Package Number K02A
TO-220
Plastic Package
DS009065-2
Front View
3-Lead TO-220 Plastic Package (T)
Order Number LM333T
See NS Package Number T03B
May 1998
LM133/LM333
3-Ampere
Adjustable
Negative
Regulators
1999 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
LM133
LM333
T
MIN
to T
MAX
-55C to +150C
-40C to +125C
Storage Temperature
-65C to +150C
Lead Temperature (Soldering, 10 sec.)
TO-3 Package
300C
TO-220 Package
260C
ESD Susceptibility
TBD
Electrical Characteristics LM133
Specifications with standard typeface are for T
J
= 25C, and those with boldface type apply over the full operating temperature
range. (Note 3)
Parameter
Conditions
Typical
Min
Max
Units
(Note 2)
(Note 2)
Reference Voltage
I
L
= 10 mA
-1.250
-1.238
-1.262
V
3V
|V
IN
- V
OUT
|
35V
-1.250
-1.225
-1.275
V
10 mA
I
L
3A, P
P
MAX
Line Regulation
3V
|V
IN
- V
OUT
|
35V
0.01
0.02
% /V
I
OUT
= 50 mA (Note 4)
0.02
0.05
Load Regulation
10 mA
I
OUT
3A, P
P
MAX
0.2
0.5
%
(Notes 4, 5)
0.4
1.0
Thermal Regulation
10 ms Pulse
0.002
0.01
% /W
Temperature Stability
T
MIN
T
J
T
MAX
0.4
%
Long Term Stability
T
J
= 125C, 1000 Hours
0.15
%
Adjust Pin Current
65
90
A
70
100
Adjust Pin Current
10 mA
I
L
3A
2
6
A
Change
3.0V
|V
IN
- V
OUT
|
35V
Minimum Load
|V
IN
- V
OUT
|
35V
2.5
5.0
mA
Current
|V
IN
- V
OUT
|
10V
1.2
2.5
Current Limit
3V
|V
IN
- V
OUT
|
10V
3.9
3.0
(Note 5)
|V
IN
- V
OUT
| = 20V
2.4
1.25
A
|V
IN
- V
OUT
| = 30V
0.4
0.3
Output Noise
10 Hz to 10 kHz
0.003
% (rms)
(% of V
OUT
)
Ripple Rejection
V
OUT
= 10V, f = 120 Hz
dB
C
ADJ
=
0 F
60
C
ADJ
= 10 F
77
Thermal Resistance
TO-3 Package (K STEEL)
1.2
1.8
C/W
Junction-to-Case
Thermal Shutdown
163
150
190
C
Temperature
Electrical Characteristics LM333
Specifications with standard typeface are for T
J
= 25C, and those with boldface type apply over the full operating temperature
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
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2
Electrical Characteristics LM333
(Continued)
Specifications with standard typeface are for T
J
= 25C, and those with boldface type apply over the full operating temperature
range. (Note 3)
Parameter
Conditions
Typical
Min
Max
Units
(Note 2)
(Note 2)
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.
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3
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 LM133 in case the input supply is shorted.
**
When C2 is larger than 10 F and -V
OUT
is larger than -25V, D2 protects the LM133 in case the output is shorted.
***
In case V
OUT
is shorted to a positive supply, D3 protects the LM133 from overvoltage, and protects the load from reversed voltage.
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4
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
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5
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)
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6
Typical Applications
(Continued)
THERMAL REGULATION
When power is dissipated in an IC, a temperature gradient
occurs across the IC chip affecting the individual IC circuit
components. With an IC regulator, this gradient can be espe-
cially severe since the power dissipation is large. Thermal
regulation is the effect of these temperature gradients on
output voltage (in percentage output change) per watt of
power change in a specified time. Thermal regulation error is
independent of electrical regulation or temperature coeffi-
cient, and occurs within 5 ms to 50 ms after a change in
power dissipation. Thermal regulation depends on IC layout
as well as electrical design. The thermal regulation of a volt-
age regulator is defined as the percentage change of V
OUT
,
per watt, within the first 10 ms after a step of power is ap-
plied. The LM133's specification is 0.01%/W, max.
In
Figure 1, a typical LM133's output drifts only 2 mV (or
0.02% of V
OUT
= -10V) when a 20W pulse is applied for 10
ms. This performance is thus well inside the specification
limit of 0.01%/Wx20W = 0.2% max. When the 20W pulse is
ended, the thermal regulation again shows a 2 mV step as
the LM133 chip cools off. Note that the load regulation error
of about 1 mV (0.01%) is additional to the thermal regulation
error. In
Figure 2, when the 20W pulse is applied for 100 ms,
the output drifts only slightly beyond the drift in the first 10
ms, and the thermal error stays well within 0.1% (10 mV).
Adjustable Lab Voltage Regulator
DS009065-12
*
The 10 F capacitors are optional to improve ripple rejection.
Adjustable Current Regulator
DS009065-13
*
0.5
R1
24
DS009065-14
FIGURE 1.
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7
Typical Applications
(Continued)
DS009065-15
FIGURE 2.
Adjustable Negative Voltage Regulator
DS009065-3
C1 = 1 F solid tantalum or 10 F aluminum electrolytic required for stability.
*C2 = 1 F solid tantalum is required only if regulator is more than 4" from power supply filter capacitor.
Output capacitors in the range of 1 F to 1000 F of aluminum or tantalum electrolytic are commonly used to provide lower output impedance and improved
transient response.
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8
Physical Dimensions
inches (millimeters) unless otherwise noted
Steel TO-3 Metal Can Package (K STEEL)
Order Number LM133K STEEL or LM333K STEEL
NS Package Number K02A
3-Lead TO-220 Plastic Package (T)
Order Number LM333T
NS Package Number T03B
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9
Notes
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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www.national.com
LM133/LM333
3-Ampere
Adjustable
Negative
Regulators
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.
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