NSC LM333K

LM133/LM333
3-Ampere Adjustable Negative Regulators
General Description
Features
The LM133/LM333 are adjustable 3-terminal negative voltage 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 resistors to set the output voltage and 1 output capacitor for
frequency compensation. The circuit design has been optimized 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 including local on-card regulation, programmable-output voltage regulation or precision current regulation. The LM133/
LM333 are ideal complements to the LM150/LM350
adjustable positive regulators.
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Output voltage adjustable from −1.2V to −32V
3.0A output current guaranteed, −55˚C to +150˚C
Line regulation typically 0.01%/V
Load regulation typically 0.2%
Excellent rejection of thermal transients
50 ppm/˚C temperature coefficient
Temperature-independent current limit
Internal thermal overload protection
P+ Product Enhancement tested
Standard 3-lead transistor package
Output is short circuit protected
Connection Diagrams
TO-3
Metal Can Package
TO-220
Plastic 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
DS009065-2
Front View
3-Lead TO-220 Plastic Package (T)
Order Number LM333T
See NS Package Number T03B
© 1999 National Semiconductor Corporation
DS009065
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LM133/LM333 3-Ampere Adjustable Negative Regulators
May 1998
Absolute Maximum Ratings (Note 1)
Storage Temperature
Lead Temperature (Soldering, 10 sec.)
TO-3 Package
TO-220 Package
ESD Susceptibility
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Dissipation
Input-Output Voltage Differential
Operating Junction Temperature Range
LM133
LM333
Internally Limited
35V
TMIN to TMAX
−55˚C to +150˚C
−40˚C to +125˚C
−65˚C to +150˚C
300˚C
260˚C
TBD
Electrical Characteristics LM133
Specifications with standard typeface are for TJ = 25˚C, and those with boldface type apply over the full operating temperature
range. (Note 3)
Parameter
Reference Voltage
Conditions
Typical
Min
Max
(Note 2)
(Note 2)
Units
IL = 10 mA
−1.250
−1.238
−1.262
V
3V ≤ |VIN − VOUT| ≤ 35V
−1.250
−1.225
−1.275
V
% /V
10 mA ≤ IL ≤ 3A, P ≤ PMAX
3V ≤ |VIN − VOUT| ≤ 35V
IOUT = 50 mA (Note 4)
0.01
0.02
0.02
0.05
10 mA ≤ IOUT ≤ 3A, P ≤ PMAX
0.2
0.5
(Notes 4, 5)
0.4
1.0
Thermal Regulation
10 ms Pulse
0.002
0.01
Temperature Stability
TMIN ≤ TJ ≤ TMAX
TJ = 125˚C, 1000 Hours
Line Regulation
Load Regulation
Long Term Stability
%
0.15
65
90
70
100
2
6
µA
mA
Adjust Pin Current
10 mA ≤ IL ≤ 3A
Change
3.0V ≤ |VIN − VOUT| ≤ 35V
Minimum Load
|VIN − VOUT| ≤ 35V
2.5
5.0
Current
|VIN − VOUT| ≤ 10V
1.2
2.5
Current Limit
3V ≤ |VIN − VOUT| ≤ 10V
|VIN − VOUT| = 20V
|VIN − VOUT| = 30V
3.9
3.0
2.4
1.25
0.4
0.3
(Note 5)
Output Noise
10 Hz to 10 kHz
% /W
%
0.4
Adjust Pin Current
%
µA
A
% (rms)
0.003
(% of VOUT)
Ripple Rejection
VOUT = 10V, f = 120 Hz
dB
CADJ = 0 µF
CADJ = 10 µF
Thermal Resistance
TO-3 Package (K STEEL)
60
77
1.2
1.8
˚C/W
190
˚C
Junction-to-Case
Thermal Shutdown
163
150
Temperature
Electrical Characteristics LM333
Specifications with standard typeface are for TJ = 25˚C, and those with boldface type apply over the full operating temperature
range. (Note 3)
Parameter
Reference Voltage
Conditions
Typical
Max
(Note 2)
IL = 10 mA
−1.250
−1.225
−1.275
3V ≤ |VIN − VOUT| ≤ 35V
−1.250
−1.213
−1.287
10 mA ≤ IL ≤ 3A, P ≤ PMAX
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Min
(Note 2)
2
Units
V
Electrical Characteristics LM333
(Continued)
Specifications with standard typeface are for TJ = 25˚C, and those with boldface type apply over the full operating temperature
range. (Note 3)
Parameter
Line Regulation
Conditions
Typical
Min
Max
(Note 2)
(Note 2)
3V ≤ |VIN − VOUT| ≤ 35V
IOUT = 50 mA (Note 4)
0.01
0.04
0.02
0.07
10 mA ≤ IL ≤ 3A, P ≤ PMAX
0.2
1.0
(Notes 4, 5)
0.4
1.5
Thermal Regulation
10 ms Pulse
0.002
0.02
Temperature Stability
TMIN ≤ TJ ≤ TMAX
TJ = 125˚C, 1000 Hours
Load Regulation
Long Term Stability
95
70
100
2.5
8
µA
mA
Change
3.0V ≤ |VIN − VOUT| ≤ 35V
Minimum Load
|VIN − VOUT| ≤ 35V
2.5
10
Current
|VIN − VOUT| ≤ 10V
1.5
5.0
Current Limit
3V ≤ |VIN − VOUT| ≤ 10V
|VIN − VOUT| = 20V
3.9
2.4
1.0
|VIN − VOUT| = 30V
0.4
0.20
10 Hz to 10 kHz
% /W
65
10 mA ≤ IL ≤ 3A
Output Noise
%
%
0.2
Adjust Pin Current
(Note 5)
% /V
%
0.5
Adjust Pin Current
Units
µA
3.0
A
0.003
% (rms)
60
dB
(% of VOUT)
Ripple Rejection
VOUT = 10V, f = 120 Hz
CADJ = 0 µF
CADJ = 10 µF
Thermal Resistance
TO-3 Package (K STEEL)
Junction to Case
TO-220 Package (T)
77
Thermal Shutdown
1.2
1.8
3
4
163
˚C/W
˚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: |VIN − VOUT| = 5V, IOUT = 0.5A, PDISS ≤ 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 ≤ |VIN − VOUT| ≤ 10V. For the range 10V ≤ |VIN − VOUT| ≤ 15V, the guaranteed
minimum output current is equal to: 30/ (VIN − VOUT). Refer to graphs for guaranteed output currents at other voltages.
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Guaranteed Performance Characteristics
LM133 Guaranteed Output Current
LM333 Guaranteed Output Current
DS009065-4
DS009065-5
Typical Applications
−5.2V Regulator with Electronic Shutdown
DS009065-6
Negative Regulator with Protection Diodes
DS009065-7
*When CL is larger than 20 µF, D1 protects the LM133 in case the input supply is shorted.
**When C2 is larger than 10 µF and −VOUT is larger than −25V, D2 protects the LM133 in case the output is shorted.
***In case VOUT is shorted to a positive supply, D3 protects the LM133 from overvoltage, and protects the load from reversed voltage.
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Typical Applications
(Continued)
High-Performance 9-Ampere Adjustable Regulator
DS009065-8
*Wire R1 and R4 to the regulator that provides the highest VOUT with a 3A load.
**Full output current requires 5V≤|VIN–VOUT|≤10V. At higher input-output voltages, load current will be less (see guaranteed curves)
Current Regulator
High Stability 10V Regulator
DS009065-9
*0.4Ω ≤ R1 ≤ 120Ω
DS009065-10
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Typical Applications
(Continued)
High-Current Adjustable Regulator
DS009065-11
*Control regulator must have the largest VREF
**Full output current requires 5V≤|VIN–VOUT| ≤10V. At higher input-output voltages, load current will be less (see guaranteed curves)
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Typical Applications
(Continued)
Adjustable Lab Voltage Regulator
Adjustable Current Regulator
DS009065-13
*0.5Ω ≤ R1 ≤ 24Ω
DS009065-12
*The 10 µF capacitors are optional to improve ripple rejection.
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 especially 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 coefficient, 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 voltage regulator is defined as the percentage change of VOUT,
per watt, within the first 10 ms after a step of power is applied. 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 VOUT = −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).
DS009065-14
FIGURE 1.
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Typical Applications
(Continued)
DS009065-15
FIGURE 2.
Adjustable Negative Voltage Regulator
DS009065-3
†
C1 = 1 µF solid tantalum or 10 µF aluminum electrolytic required for stability.
*C2 = 1 µF solid tantalum is required only if regulator is more than 4" from power supply filter capacitor.
Output capacitors in the range of 1 µF to 1000 µF of aluminum or tantalum electrolytic are commonly used to provide lower output impedance and improved
transient response.
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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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LM133/LM333 3-Ampere Adjustable Negative Regulators
Notes
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