P RECISION P ROGRAMMABLE R EFERENCES P RODUCTION D ATA S HEET

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1 LX64 / 64A / 64B P RECISION P ROGRAMMABLE R EFERENCES T HE I NFINITE P OWER OF I NNOVATION P RODUCTION D ATA S HEET DESCRIPTION The LX64 series precision adjustable three terminal shunt voltage regulators are pin-to-pin compatible with the industry standard TL4, but with significant improvements. The LX64 design has eliminated regions of instability common to older generation shunt regulator products like the TL4. Designs are made simpler by eliminating the task of insuring capacitive loads, and output voltage and cathode currents don t combine for unstable operation. The capacitor value is chose simply to give the best load transient response without the possibility of instability. A lower reference input current allows the use of higher value reference divider resistors, reducing the current drain from batteries in portable equipment as well as reducing the voltage programming errors due to the impedance of the divider network (See product Highlight) In addition, the LX64B has an improved initial accuracy of.4%, and the output voltage is programmable by using two external resistors from.5v to 6V. These devices offer low output impedance for improved load regulation. The typical output impedance of these devices is mω. The reduced reference input bias current and minimum operating currents make these devices suitable for portable and micro power applications. IMPORTANT: For the most current data, consult MICROSEMI s website: Output Voltage Error Due to I REF T A ( C) to 7-4 to 85 Initial PK PRODUCT HIGHLIGHT Tolerance RoHS Compliant / Pb-free Transition D/C: 58 PACKAGE ORDER INFO Plastic TO-89 Plastic SOIC -Pin DM 8-Pin RoHS Compliant / Pb-free Transition D/C: 44 LP KEY FEATURES Unconditionally Stable for All Cathode To Anode Capacitance Values Reduced Reference Input Current Allowing The Use of Higher Value Divider Resistors (.5µA) Initial Voltage Reference Accuracy of.4% (LX64B) Sink Current Capability.6mA to ma Typical Output Dynamic Impedance Less Than mω Adjustable Output Voltage From.5V to 6V Plastic TO-9 -Pin RoHS Compliant / Pb-free Transition D/C: 59 % LX64CPK LX64CDM LX64CLP % LX64ACPK LX64ACDM LX64ACLP.4% LX64BCPK LX64BCDM LX64BCLP % LX64IPK LX64IDM LX64ILP % LX64AIPK LX64AIDM LX64AILP.4% LX64BIPK LX64BIDM LX64BILP Note: Available in Tape & Reel. Append the letters TR to the part number. (i.e. LX64CDM-TR),5-4-4 L INF INITY M ICROELECTRONICS I NC. 86 WESTERN AVENUE, GARDEN GROVE, CA. 984, , FAX:

2 LX64 / 64A / 64B P RECISION P ROGRAMMABLE R EFERENCES T HE I NFINITE P OWER OF I NNOVATION ABSOLUTE MAXIMUM RATINGS P RODUCTION D ATA S HEET PACKAGE PIN OUT Cathode to Anode Voltage ( )... -.V to 7V Reference Input Current (I REF )...-5µA to µa Continuous Cathode Current ( )... -ma to 5mA Operating Temperature Range... 5 C Maximum Operating Junction Temperature Plastic (DM & LP Packages)... 5 C Storage Temperature Range C to 5 C Package Peak Temp. for Solder Reflow (4 seconds maximum exposure)... 6 C (+ -5) Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal. Pin numbers refer to DIL packages only. DM Plastic SOIC 8-Pin THERMAL DATA THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA LP Plastic TO-9 -Pin THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA PK Plastic TO-89 -Pin THERMALRESISTANCE-JUNCTION TO TAB, θ JT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA 65 C/W 56 C/W 5 C/W 7 C/W Junction Temperature Calculation: T J = T A + (P D x θ JA ). The θ JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. REF(R) SIMPLIFIED BLOCK DIAGRAM Cathode (K) CATHODE N.C. ANODE N.C. REF ANODE CATHODE DM PACKAGE (Top View) CATHODE ANODE REF LP PACKAGE (Top View) PK PACKAGE (Top View) N.C. No Connection REF ANODE ANODE N.C. RoHS / Pb-free % Matte Tin Lead Finish + - V REF Anode (A),5-4-4 L INF INITY M ICROELECTRONICS I NC. 86 WESTERN AVENUE, GARDEN GROVE, CA. 984, , FAX:

3 PRODUCT DATABOOK 996/997 LX64/LX64A/LX64B ELECTRICAL CHARACTERISTICS (Note ) (Unless otherwise specified, these specifications apply over the operating ambient temperatures for LX64C/LX64AC/LX64BC with C T A 7 C, LX64I/LX64AI/LX64BI with -4 C T A 85 C.) Parameter Symbol Test Conditions Reference Input Voltage LX64 V REF = ma,, T A, LX64A = ma,, T A LX64B = ma,, T A Reference Drift LX64 = ma,, C T A 7 C = ma,, -4 C T A 85 C LX64A = ma,, C T A 7 C = ma,, -4 C T A 85 C LX64B = ma,, C T A 7 C = ma,, -4 C T A 85 C Voltage Ratio, Reference to Cathode = ma, =.5V to 6V, T A (Note ) = ma, =.5V to 6V, T A = Operating Range Reference Input Current I REF, T A, T A = Operating Range Minimum Operating Current I MIN to 6V, T A to 6V, T A = Operating Range Off-State Cathode Current I OFF = 6V, V REF = V, T A Dynamic Impedance Z KA, =.6mA to ma, f khz, T A Note. These parameters are guaranteed by design. Note. V REF Ratio of change in reference input voltage to the change in cathode voltage. LX64 Min. Typ. Max. Units mv 47 5 mv 49 5 mv 5 mv 5 mv 5 mv 5 mv 5 mv mv. mv/v. mv/v..5 µa..5 µa.4.6 ma.4.6 ma. µa mω

4 LX64/LX64A/LX64B PRODUCT DATABOOK 996/997 GRAPH / CURVE INDEX Characteristic Curves FIGURE #. REFERENCE VOLTAGE vs. FREE-AIR TEMPERATURE. REFERENCE CURRENT vs. FREE-AIR TEMPERATURE. CATHODE CURRENT vs. CATHODE VOLTAGE 4. OFF-STATE CATHODE CURRENT vs. FREE-AIR TEMPERATURE 5. RATIO OF DELTA REFERENCE VOLTAGE TO DELTA CATHODE VOLTAGE vs. FREE-AIR TEMPERATURE 6. EQUIVALENT INPUT NOISE VOLTAGE vs. FREQUENCY FIGURE INDEX Application Information FIGURE # 7. COMPARISON OF REFERENCE RESISTOR VALUES BETWEEN AN LX64B AND A TL4. Resistors used with the LX64B are 5 times higher in value. 8. COMPARISON OF REFERENCE RESISTOR VALUES BETWEEN AN LX64B AND A TL4. When used as.5%, 5V shunt regulators. Parameter Measurement Information FIGURE # 9. TEST CIRCUIT FOR. TEST CIRCUIT FOR > V REF. TEST CIRCUIT FOR I OFF Typical Characteristics FIGURE #. EQUIVALENT INPUT NOISE VOLTAGE OVER A -SECOND PERIOD. SMALL-SIGNAL VOLTAGE AMPLIFICATION vs. FREQUENCY 4. REFERENCE IMPEDANCE vs. FREQUENCY 5. PULSE RESPONSE 6. DIFFERENTIAL VOLTAGE AMPLIFICATION vs. FREQUENCY 4

5 PRODUCT DATABOOK 996/997 LX64/LX64A/LX64B CHARACTERISTIC CURVES (V REF ) Reference Voltage - (V) ( ) Cathode Current - (µa) FIGURE. REFERENCE VOLTAGE vs. FREE-AIR TEMPERATURE FIGURE. CATHODE CURRENT vs. CATHODE VOLTAGE V REF = = ma (T A ) Ambient Temperature - ( C) T A FIGURE. REFERENCE CURRENT vs. FREE-AIR TEMPERATURE (I REF ) Reference Current - (µa) = ma R = k (T A ) Ambient Temperature - ( C) FIGURE 4. OFF-STATE CATHODE CURRENT vs. FREE-AIR TEMPERATURE (I OFF ) Off-State Cathode Current - (µa) = 6V V REF = ( ) Cathode Voltage - (V) (T A ) Ambient Temperature - ( C) 5

6 LX64/LX64A/LX64B PRODUCT DATABOOK 996/997 CHARACTERISTIC CURVES FIGURE 5. RATIO OF DELTA REFERENCE VOLTAGE TO DELTA CATHODE VOLTAGE vs. FREE-AIR TEMPERATURE V REF / - (mv/v) = V to 6V (T A ) Ambient Temperature - ( C) FIGURE 6. EQUIVALENT INPUT NOISE VOLTAGE vs. FREQUENCY (V N ) Noise Voltage - (nv/ Hz) k k k (f) Frequency - (Hz) I O = ma T A 6

7 PRODUCT DATABOOK 996/997 LX64/LX64A/LX64B Application Hints The reference input current of the LX64 series voltage references is much lower than other similar precision parts. This helps to design programmable voltage references that can use much higher value programming resistors while maintaining the same accuracy as the other precision parts. Figure 7 below shows a 5V, % shunt regulator using the LX64B and a shunt regulator using the TL4 (Also available from Linfinity). Figure 8 shows.5% shunt regulators. Noteworthy are the values of the reference resistors used in the two circuits. With the LX64B it is possible to use 5k resistors for setting the output voltage with % precision as opposed to 5k programming resistors when the same precision needs to be achieved with a TL4. V IN V IN LX64B TL4 a) b) R R R R APPLICATION INFORMATION 5k.% 5k.% 5k.% 5k.% 5V, % 5V, % V IN V IN LX64B TL4 a) b) k.% k.% The output voltage of the reference can be programmed by using the formula below: V R.5 + KA R If more accuracy is required then the effects of the input bias current (I REF ) must be taken into account. The formula below accounts for the error this current produces. Smaller values of programming resistors tend to minimize bias current errors. In this respect the low input current characteristics of the LX64B helps to reduce the power dissipation on the programming resistors by a factor of five compared to other references like the TL4 and TL4. The LX64 series of voltage references have an enhanced circuit design that can tolerate any value of cathode to anode capacitance. R R 4.% 4.% 5V,.5% FIGURE 8 Comparison of reference resistor values between an LX64B and a TL4, when used as.5%, 5V shunt regulators. V =.5 + KA R R R + I R REF 5V,.5% FIGURE 7 Comparison of reference resistor values between an LX64B and an TL4, resistors used with the LX64B are 5 times higher in value. R 7

8 LX64/LX64A/LX64B PRODUCT DATABOOK 996/997 PARAMETER MEASUREMENT INFORMATION Input V REF FIGURE 9 TEST CIRCUIT FOR Input I OFF FIGURE TEST CIRCUIT FOR I OFF Input V REF FIGURE TEST CIRCUIT FOR > V REF R R I REF 8

9 PRODUCT DATABOOK 996/997 LX64/LX64A/LX64B TYPICAL CHARACTERISTICS 5µF 9.V (V N ) Input Noise Voltage - (µv) (t) Time - (s) f =. to Hz = ma T A FIGURE. EQUIVALENT INPUT NOISE VOLTAGE OVER A -SECOND PERIOD k 9 LX64 (DUT) 8 6 µf.µf 6k V CC µf TLE7 A V = V/mV TLE7 6k 6k µf k A V = V/V k V CC.µF M CRO V EE V EE Test Circuit for.hz to Hz Equivalent Input Noise Voltage Rev..a 9

10 LX64/LX64A/LX64B PRODUCT DATABOOK 996/997 TYPICAL CHARACTERISTICS FIGURE. SMALL-SIGNAL VOLTAGE AMPLIFICATION vs. FREQUENCY (A V ) Voltage Amplification - (db) k k k M M (f) Frequency - (Hz) = ma T A FIGURE 4. REFERENCE IMPEDANCE vs. FREQUENCY ( z KA ) Reference Impedance - ( ) = ma to ma T A 9µF 5k 8.5k Test Circuit for Voltage Amplification 5 k Output Output. k k k M M (f) Frequency - (Hz) Test Circuit for Reference Impedance

11 PRODUCT DATABOOK 996/997 LX64/LX64A/LX64B TYPICAL CHARACTERISTICS FIGURE 5. PULSE RESPONSE V IN - (V) ( ) Output Voltage - (V) FIGURE 6. A VD - Differential Voltage Amplification - (db) 4 5 (t) Time - (µs) DIFFERENTIAL VOLTAGE AMPLIFICATION vs. FREQUENCY 5 8 Phase Shift - - G M / 9 6 Pulse Generator f = khz 5 Test Circuit for Pulse Response +5V -5 k k k M Frequency - (Hz) -9-8 Phase Shift To Network Analyzer as DUT Input Port with X Probe C µf R K R K R K C µf R4 DUT is bias at ma and 5V Test Setup for Measuring A VD vs. Frequency Output To Network Analyzer as DUT Output Port PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, and is current as of publication date. This document may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.