LM133.PDF

November 1995

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 b 3.0A

over an output voltage range of b 1.2V to b 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 cur-

rent limiting, thermal shutdown and safe-area compensa-

tion, making them substantially immune to failure from over-

loads.

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 adjust-

able positive regulators.

Features

Y Output voltage adjustable from b 1.2V to b 32V

Y 3.0A output current guaranteed, b 55 § Cto a 150 § C

Y Line regulation typically 0.01%/V

Y Load regulation typically 0.2%

Y Excellent rejection of thermal transients

Y 50 ppm/ § C temperature coefficient

Y Temperature-independent current limit

Y Internal thermal overload protection

Y P a Product Enhancement tested

Y Standard 3-lead transistor package

Y Output is short circuit protected

Connection Diagrams

TO-3

Metal Can Package

Typical Applications

Adjustable Negative Voltage Regulator

TL/H/9065±1

Bottom View

Steel TO-3 Metal Can Package

(K STEEL)

Order Number LM133K STEEL or

LM333K STEEL

See NS Package Number K02A

TL/H/9065±3

² C1 e 1 m F solid tantalum or 10 m F aluminum electrolytic required for stability.

*C2 e 1 m F solid tantalum is required only if regulator is more than 4 × from power supply filter capaci-

tor.

Output capacitors in the range of 1 m F to 1000 m F of aluminum or tantalum electrolytic are commonly

used to provide lower output impedance and improved transient response.

1 a

120 X

b IADJ c R2

TO-220

Plastic Package

TL/H/9065±2

Front View

3-Lead TO-220 Plastic Package (T)

Order Number LM333T

See NS Package Number T03B

C 1995 National Semiconductor Corporation

TL/H/9065

RRD-B30M115/Printed in U. S. A.

b VOUT eb 1.25V

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

Storage Temperature

b 65 § Cto a 150 § C

Lead Temperature (Soldering, 10 sec.)

TO-3 Package

300 § C

Internally Limited

TO-220 Package

260 § C

Input-Output Voltage Differential

35V

ESD Susceptibility

TBD

Operating Junction Temperature Range

T MIN to T MAX

LM133

b 55 § Cto a 150 § C

LM333

b 40 § Cto a 125 § C

Electrical Characteristics LM133 Specifications with standard typeface are for T J e 25 § C, and those with

boldface type apply over the full operating temperature range. (Note 3)

Parameter

Conditions

Typical

Min

Max

Units

(Note 2)

Reference Voltage

I L e 10 mA

b 1.250 b 1.238 b 1.262

3V s l V IN b V OUT l s 35V

b 1.250 b 1.225 b 1.275

10 mA s I L s 3A, P s P MAX

Line Regulation

3V s l V IN b V OUT l s 35V

0.01

0.02

% /V

I OUT e 50 mA (Note 4)

0.02

0.05

Load Regulation

10 mA s I OUT s 3A, P s 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 s T J s T MAX

0.4

Long Term Stability

T J e 125 § C, 1000 Hours

0.15

Adjust Pin Current

m A

100

Adjust Pin Current

10 mA s I L s 3A

m A

Change

3.0V s l V IN b V OUT l s 35V

l V IN b V OUT l s 35V

Minimum Load

2.5

5.0

Current

l V IN b V OUT l s 10V

1.2

2.5

Current Limit

3V s l V IN b V OUT l s 10V

3.9

3.0

(Note 5)

l V IN b V OUT l e 20V

2.4

1.25

l V IN b V OUT l e 30V

0.4

0.3

Output Noise

10 Hz to 10 kHz

0.003

% (rms)

(% of V OUT )

Ripple Rejection

V OUT e 10V, f e 120 Hz

C ADJ e 0 m F

C ADJ e 10 m F

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 e 25 § C, and those with

boldface type apply over the full operating temperature range. (Note 3)

Parameter

Conditions

Typical

Min

Max

Units

(Note 2)

Reference Voltage

I L e 10 mA

b 1.250 b 1.225 b 1.275

3V s l V IN b V OUT l s 35V b 1.250 b 1.213 b 1.287

10 mA s I L s 3A, P s P MAX

Line Regulation

3V s l V IN b V OUT l s 35V

0.01

0.04

% /V

I OUT e 50 mA (Note 4)

0.02

0.07

Load Regulation

10 mA s I L s 3A, P s P MAX

0.2

1.0

(Notes 4 and 5)

0.4

1.5

Thermal Regulation

10 ms Pulse

0.002

0.02

% /W

Temperature Stability

T MIN s T J s T MAX

0.5

Long Term Stability

T J e 125 § C, 1000 Hours

0.2

Adjust Pin Current

m A

100

Adjust Pin Current

10 mA s I L s 3A

2.5

m A

Change

3.0V s l V IN b V OUT l s 35V

Minimum Load

l V IN b V OUT l s 35V

2.5

Current

l V IN b V OUT l s 10V

1.5

5.0

Current Limit

3V s l V IN b V OUT l s 10V

3.9

3.0

(Note 5)

l V IN b V OUT l e 20V

2.4

1.0

l V IN b V OUT l e 30V

0.4

0.20

Output Noise

10 Hz to 10 kHz

0.003

% (rms)

(% of V OUT )

Ripple Rejection

V OUT e 10V, f e 120 Hz

C ADJ e 0 m F

C ADJ e 10 m F

Thermal Resistance

TO-3 Package (K STEEL)

1.2

1.8

§ C/W

Junction to Case

TO-220 Package (T)

Thermal Shutdown

163

§ C

Temperature

Thermal Resistance

K Package

Junction to Ambient

T Package

§ 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: l VIN b VOUT l e 5V, IOUT e 0.5A, PDISS s 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,

× below the base of the package.

Note 5: The output current of the LM333 is guaranteed to be t 3A in the range 3V s l V IN b V OUT l s 10V. For the range 10V s l V IN b V OUT l s 15V, the

guaranteed minimum output current is equal to: 30/ (V IN b V OUT ). Refer to graphs for guaranteed output currents at other voltages.

(/8

Guaranteed Performance Characteristics

LM133 Guaranteed Output Current

LM333 Guaranteed Output Current

TL/H/9065±4

TL/H/9065±5

Typical Applications (Continued)

b 5.2V Regulator with Electronic Shutdown

TL/H/9065±6

Negative Regulator with Protection Diodes

*When C L is larger than 20 m F, D1 protects the

LM133 in case the input supply is shorted.

**When C2 is larger than 10 m F and b V OUT is

larger than b 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.

TL/H/9065±7

Typical Applications (Continued)

High-Performance 9-Ampere Adjustable Regulator

*Wire R1 and R4 to the regulator that

provides the highest V OUT with a 3A

load.

**Full output current requires

5V s l V IN ±V OUT l s 10V. At higher in-

put-output voltages, load current will

be less (see guaranteed curves)

TL/H/9065±8

Current Regulator

High Stability 10V Regulator

V REF

*0.4 X s R1 s 120 X

TL/H/9065±9

TL/H/9065±10

I OUT e

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