Datasheet LM333T Datasheet (NSC)

LM333
3-Ampere Adjustable Negative Regulator

LM333 3-Ampere Adjustable Negative Regulators

December 2000

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 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 LM333 features internal current limiting, thermal
shutdown and safe-area compensation, making them sub­stantially immune to failure from overloads.

The LM333 serves a wide variety of applications including
local on-card regulation, programmable-output voltage regu­lation or precision current regulation. The LM333 is an ideal
complement to the LM150/LM350 adjustable positive regu­lators.

Connection Diagram

Metal Can Package

Bottom View

Steel TO-3 Metal Can Package (K STEEL)

Order Number LM333K STEEL

See NS Package Number K02A

Features

n Output voltage adjustable from −1.2V to −32V
n 3.0A output current guaranteed, −55˚C to +150˚C
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

TO-3

DS009065-1

Typical Application

−5.2V Regulator with Electronic Shutdown

DS009065-6

© 2000 National Semiconductor Corporation DS009065 www.national.com

Absolute Maximum Ratings (Note 1)

LM333

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

−40˚C to +125˚C
Storage Temperature −65˚C to +150˚C
Lead Temperature (Soldering, 10 sec.)

TO-3 Package 300˚C

ESD Susceptibility TBD

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 Conditions Typical Min Max Units

(Note 2) (Note 2)

Reference Voltage I

Line Regulation 3V ≤ |VIN−V

Load Regulation 10 mA ≤ I

Thermal Regulation 10 ms Pulse 0.002 0.02 % /W
Temperature Stability T
Long Term Stability T
Adjust Pin Current 65 95 µA

Adjust Pin Current 10 mA ≤ I
Change 3.0V ≤ |V
Minimum Load |V
Current |V
Current Limit 3V ≤ |V
(Note 5) |V

Output Noise 10 Hz to 10 kHz 0.003 % (rms)
(% of V

OUT

)

Ripple Rejection V

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: AbsoluteMaximumRatingsindicate 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
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,
Note 5: The output current of the LM333 is guaranteed to be ≥ 3A in the range 3V ≤ |V

minimum output current is equal to: 30/ (V

= 10 mA −1.250 −1.225 −1.275 V

L

3V ≤ |V

IN−VOUT

10 mA ≤ I

I

= 50 mA (Note 4) 0.02 0.07

OUT

| ≤ 35V −1.250 −1.213 −1.287

≤ 3A, P ≤ P

L

OUT

≤ 3A, P ≤ P

L

MAX

| ≤ 35V 0.01 0.04 % /V

MAX

0.2 1.0 %

(Notes 4, 5) 0.4 1.5

≤ TJ≤ T

MIN

= 125˚C, 1000 Hours 0.2 %

J

MAX

0.5 %

70 100

≤ 3A 2.5 8 µA

L

IN−VOUT
IN−VOUT
IN−VOUT

IN−VOUT

IN−VOUT

|V

IN−VOUT

= 10V, f = 120 Hz

OUT

|=5V,I

IN−VOUT

IN−VOUT

| ≤ 35V
| ≤ 35V 2.5 10 mA
| ≤ 10V 1.5 5.0

| ≤ 10V 3.9 3.0
| = 20V 2.4 1.0 A
| = 30V 0.4 0.20

C

= 0 µF 60 dB

ADJ

C

=10µF 77

ADJ

= 0.5A, P

OUT

). Refer to graphs for guaranteed output currents at other voltages.

DISS

≤ 30W.

| ≤ 10V. For the range 10V ≤ |VIN−V

IN−VOUT

1

⁄8" below the base of the package.

| ≤ 15V, the guaranteed

OUT

to T

MAX

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Guaranteed Performance Characteristics

LM333

LM133 Guaranteed Output Current

Typical Applications

LM333 Guaranteed Output Current

DS009065-4

−5.2V Regulator with Electronic Shutdown

DS009065-5

Negative Regulator with Protection Diodes

*

When CLis larger than 20 µF, D1 protects the LM333 in case the input supply is shorted.

**

When C2 is larger than 10 µF and −V

***

In case V

is shorted to a positive supply, D3 protects the LM333 from overvoltage, and protects the load from reversed voltage.

OUT

is larger than −25V, D2 protects the LM333 in case the output is shorted.

OUT

DS009065-6

DS009065-7

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Typical Applications (Continued)

LM333

High-Performance 9-Ampere Adjustable Regulator

*

Wire R1 and R4 to the regulator that provides the highest V

**

Full output current requires 5V≤|VIN–V

|≤10V.At higher input-output voltages, load current will be less (see guaranteed curves)

OUT

Current Regulator

DS009065-9

*

0.4Ω≤R1 ≤ 120Ω

with a 3A load.

OUT

DS009065-8

High Stability 10V Regulator

DS009065-10

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Typical Applications (Continued)

High-Current Adjustable Regulator

LM333

*

Control regulator must have the largest V

**

Full output current requires 5V≤|VIN–V

REF

| ≤10V. At higher input-output voltages, load current will be less (see guaranteed curves)

OUT

DS009065-11

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Typical Applications (Continued)

LM333

Adjustable Lab Voltage Regulator

*

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 50ms 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
V

, per watt, within the first 10 ms after a step of power is

OUT

applied. The LM333’s specification is 0.01%/W, max.
In

Figure 1

0.02% of V
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 showsa2mVstep as
the LM333 chip cools off. Note that the load regulation error
of about 1 mV (0.01%) is additional to the thermal regulation
error.In
the output drifts only slightly beyond the drift in the first
10ms, and the thermal error stays well within 0.1% (10mV).

, a typical LM333’s output drifts only 2mV (or

= −10V) when a 20W pulse is applied for 10

OUT

Figure 2

, when the 20W pulse is applied for 100 ms,

DS009065-12

Adjustable Current Regulator

*

0.5Ω≤R1 ≤ 24Ω

FIGURE 1.

DS009065-13

DS009065-14

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Typical Applications (Continued)

Adjustable Negative Voltage Regulator

LM333

DS009065-15

FIGURE 2.

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†

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 Numbe LM333K STEEL

NS Package Number K02A

LM333 3-Ampere Adjustable Negative Regulators

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