LM368YH-5

TL H 5522LM368-5 0 and LM368-10 Precision Voltage References

LM368YH-5

LM368YH-5

LM368YH-5

LM368YH-5

January

LM368YH-5

1995

LM368-5 0and LM368-10Precision Voltage References General Description

The LM368is a precision monolithic temperature-compen-

sated voltage reference The LM368makes use of thin-film

technology enhanced by the discrete laser trimming of re-

sistors to achieve excellent Temperature coefficient

(Tempco)of V OUT(as low as5ppm C) along with tight

initial tolerance (as low as0 02%) The trim scheme is such

that individual resistors are cut open rather than being

trimmed(partially cut) to avoid resistor drift caused by elec-

tromigration in the trimmed area The LM368also provides

excellent stability vs changes in input voltage and output

current(both sourcing and sinking) This device is available

in output voltage options of5 0V and10 0V and will operate

in both series or shunt mode Also see the LM368-2 5data

sheet for a2 5V output The devices are short circuit proof

when sourcing current A trim pin is made available for fine

trimming of V OUT or for obtaining intermediate values with-

out greatly affecting the Tempco of the device

Features

Y300m A operating current

Y Low output impedance

Y Excellent line regulation( 0001% V typical)

Y Single-supply operation

Y Externally trimmable

Y Low temperature coefficient

Y Operates in series or shunt mode

Y10 0V or5 0V

Y Excellent initial accuracy(0 02%typical)

Connection Diagram

Metal Can Package

TL H 5522–1

Top View

case connected to V b

Order Number LM368YH-10

LM368YH-5 0 LM368H-10 LM368H-5 0

See NS Package Number H08C

Typical Applications

Series Regulator

TL H 5522–2

Shunt Regulator

TL H 5522–3

C1995National Semiconductor Corporation RRD-B30M115 Printed in U S A

Absolute

LM368YH-5

Maximum Ratings(Note8)

Input Voltage(Series Mode)35V Reverse Current(Shunt Mode)50mA Power Dissipation600mW Storage Temperature Range b60 C to a150 C Operating Temperature Range

LM3680 C to a70 C Soldering Information

TO-5(H)Package 10sec a300 C See AN-450‘‘Surface Mounting Methods and Their Effect on Product Reliability’’(Appendix D)for other methods of soldering surface mount devices

Electrical Characteristics(Note1)

LM368

Tested Design Units Parameter Conditions Typical Limit Limit(Max unless

(Note2)(Note3)noted)

V OUT Error g0 02g0 1%

Line Regulation(V OUT a3V)s V IN s30V g0 0001g0 0005% V

Load Regulation0mA s I SOURCE s10mA g0 0003g0 001% mA (Note4)b10mA s I SINK s0mA g0 003g0 008% mA Thermal Regulation T e20mS(Note5)g0 005g0 01% 100mW Quiescent Current250350m A Change of Quiescent Current vs V IN(V OUT a3V)s V IN s30V35m A V Temperature Coefficient

of V OUT(see graph) LM368Y0 C s T A s70 C g11g20ppm C (Note6)LM3680 C s T A s70 C g15g30ppm C Short Circuit Current V OUT e03070100mA Noise 10 0V 0 1-10Hz30uVp-p 100Hz-10kHz1100nV 0Hz

6 2V 0 1-10Hz20uVp-p

100Hz-10kHz700nV 0Hz

5 0V 0 1-10Hz16uVp-p

100Hz-10kHz575nV 0Hz V OUT Adjust Range 10 000V0V s V PIN5s V OUT4 5-17 06 0-15 5V min

5 000V4 4-7 04 5-

6 0V min

Note1 Unless otherwise noted these specifications apply T A e25 C V IN e15V I LOAD e0 0s C L s200pF Circuit is operating in Series Mode Or circuit is operating in Shunt Mode V IN e a15V or V IN e V OUT TA e a25 C I LOAD e b1 0mA 0s C L s200pF

Note2 Tested Limits are guaranteed and100%tested in production

Note3 Design Limits are guaranteed(but not100%production tested)over the indicated temperature and supply voltage ranges These limits are not used to calculate outgoing quality levels

Note4 The LM368has a Class B output and will exhibit transients at the crossover point This point occurs when the device is asked to sink approximately 120m A In some applications it may be advantageous to preload the output to either V IN or Ground to avoid this crossover point

Note5 Thermal Regulation is defined as the change in the output Voltage at a time T after a step change in power dissipation of100mW

Note6 Temperature Coefficient of V OUT is defined as the worst case delta-V OUT measured at Specified Temperatures divided by the total span of the Specified Temperature Range(See graphs) There is no guarantee that the Specified Temperatures are exactly at the minimum or maximum deviation

Note7 In metal can(H) i J–C is75 C W and i J–A is150 C W

Note8 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur DC and AC electrical specifications do not apply when operating the device beyond its Rated Operating Conditions(see Note1and Conditions)

2

LM368YH-5

Typical

Performance Characteristics

(Note 1)Voltage and Temperature Quiescent Current vs Input

(Series Mode Sourcing Current)

Dropout Voltage vs Output Current Output Current Output Change vs (Sourcing Current)Output Impedance vs Frequency

Ripple Rejection vs Frequency (Sinking Current)

Output Impedance vs Frequency LM368-10(Curve A)

Temperature Coefficient

TL H 5522–4

Typical Temperature Coefficient Calculations

LM368-10(see Curve A)

T C e 7 7mV (70 c 10V)

e 11c 10E-6e 11ppm C Output Noise vs Frequency

LM368YH-5

TL H 5522–5

(1)LM368alone

(2)with 0 01m f Mylar Trim to Gnd

(3)with 10X in series with 10m f V OUT to Gnd

(4)with Both

3

LM368YH-5

LM368YH-5

LM368YH-5

LM368YH-5

LM368YH-5

Typical

LM368YH-5

Applications

Wide Range Trimmable Regulator

TL H 5522–7

Adjustable Zener

TL H 5522–9

g Reference

TL H 5522–11

Narrow Range Trimmable Regulator(g1%min )

TL H 5522–8

Improved Noise Performance

TL H 5522–10

g10V g5V References

e LF444A or

LF412A

TL H 5522–12

R e Thin Film Resistor Network

g0 05%Matching and5ppm Tracking

(Beckman694-3-R-10K-A)

(Caddock T-914-10K-100-05)

or similar

4

LM368YH-5

LM368YH-5

LM368YH-5

LM368YH-5

LM368YH-5

Typical

LM368YH-5

Applications(Continued)

Multiple Output Voltages

TL H 5522–13

TL H 5522–14

R e Thin Film Resistor Network

0 05%Matching and5ppm Tracking

(Beckman694-3-R-10K-A)

(Caddock T-914-10K-100-05)

or similar

TL H 5522–15

Reference with Booster

TL H 5522–16

100mA Boosted Reference

TL H 5522–17

5

LM368YH-5

Typical Applications(Continued)

Buffered High-Current Reference with Filter

LM368YH-5

TL H 5522–18 Simplified Schematic Diagram

LM368YH-5

TL H 5522–6

Reg U S Pat Off

6

LM368YH-5

LM368YH-5

7

L M 368-5 0a n d L M 368-10P r e c i s i o n V o l t a g e R e f e r e n c e s Physical Dimensions inches (millimeters)

LM368YH-5

Thermal resistance is 45 C W junction to case and 150 C W junction to still air

Metal Can Package (H)

Order Number LM368YH-10

LM368YH-5 0 LM368H-10 LM368H-5 0

NS Package Number H08C

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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein

1 Life support devices or systems are devices or

2 A critical component is any component of a life systems which (a)are intended for surgical implant

support device or system whose failure to perform can into the body or (b)support or sustain life and whose

be reasonably expected to cause the failure of the life failure to perform when properly used in accordance

support device or system or to affect its safety or with instructions for use provided in the labeling can

effectiveness be reasonably expected to result in a significant injury

to the user

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LM368YH-5

LM368YH-5

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