LM368YH-5
TL H 5522LM368-5 0 and LM368-10 Precision Voltage References
January
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
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
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
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
Typical
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
Typical
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
Typical Applications(Continued)
Buffered High-Current Reference with Filter
TL H 5522–18 Simplified Schematic Diagram
TL H 5522–6
Reg U S Pat Off
6
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)
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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