LT6657 – 1.5ppm/°C Drift, Low Noise, Buffered Reference

1 LT6657 . C Drift, Low noise , Buffered Reference Features Description nn Low Drift The LT 6657 is a precision voltage Reference that combines nn A Grade: C Max robust operating characteristics with extremely low drift nn B Grade: 3ppm/ C Max and low noise . With advanced curvature compensation, nn Low noise : this bandgap Reference achieves C drift with nn P-P ( to 10Hz) predictable temperature behavior, and an initial voltage nn RMS (10Hz to 1kHz) accuracy of It also offers noise and very nn Wide Supply Range to 40V low temperature cycling hysteresis.

2 Nn Sources and Sinks 10mA Min nn Line Regulation: The LT6657 is a low dropout Reference that can be powered nn Load Regulation: 2 V/mA. from as little as 50mV above the output voltage, up to 40V. nn Reverse Supply Protection The Buffered output supports 10mA of output drive with nn Reverse Output Protection low output impedance and precise load regulation. The nn Low Power Shutdown: <4 A Max high sink current capability allows operation as a negative nn Min Supply for Option voltage Reference with the same precision as a positive nn Thermal Protection Reference .

3 This part is safe under reverse battery condi- tions, and includes current protection when the output is nn Can Operate in Shunt Mode nn Configurable as a Negative Reference short-circuited and thermal shutdown for overload condi- nn Available Output Voltage Options: , , 3V, tions. A shutdown is included to allow power reduction while enabling a quick turn-on. , 5V. nn MSOP-8 Package The LT6657 is fully specified over the temperature range of 40 C to 125 C. It is available in the 8-lead MSOP package. Applications L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation.

4 All other trademarks are the property of their respective owners. nn High Temperature Industrial nn High Resolution Data Acquisition Systems nn Instrumentation and Process Control nn Automotive Control and Monitoring nn Medical Equipment nn Shunt and Negative Voltage References Typical Application Output Voltage Temperature Drift OUTPUT VOLTAGE CHANGE (NORMALIZED) (PPM). 200. THREE TYPICAL PARTS. Basic Connection 100. 1ppm/ C BOX. 2 0. (VOUT + 50mV) < VIN < 40V IN. 6. LT6657 OUT VOUT. 3. CIN SHDN COUT. F 1 F 100. GND. 6657 TA01a 4. 200. 45 20 5 30 55 80 105 130.

5 TEMPERATURE ( C). 6657 TA01b 6657fd For more information 1. LT6657 . Absolute Maximum Ratings Pin Configuration (Note 1). Input Voltage VIN (to GND).. 40V to 40V TOP VIEW. Shutdown Voltage 20V to 40V DNC 1 8 DNC. Output Voltage 3V to 30V VIN. SHDN. 2. 3. 7. 6. DNC. VOUT. Input-to-Output Differential Voltage (Note 2).. 40V GND 4 5 DNC. Output Short-Circuit Indefinite MS8 PACKAGE. 8-LEAD PLASTIC MSOP. Operating Junction Temperature TJMAX = 150 C, JA = 273 C/W. 40 C to 150 C DNC: CONNECTED INTERNALLY. DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS.

6 Storage Temperature 65 C to 150 C. Lead Temperature (Soldering 10 sec). (Note 3).. 300 C. Order Information #orderinfo TUBE TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE. #PBF #TRPBF LTGYR 8-Lead Plastic MSOP 40 C to 125 C. #PBF #TRPBF LTGYR 8-Lead Plastic MSOP 40 C to 125 C. #PBF #TRPBF LTGKN 8-Lead Plastic MSOP 40 C to 125 C. #PBF #TRPBF LTGKN 8-Lead Plastic MSOP 40 C to 125 C. LT6657 AHMS8-3#PBF LT6657 AHMS8-3#TRPBF LTGYG 8-Lead Plastic MSOP 40 C to 125 C. LT6657 BHMS8-3#PBF LT6657 BHMS8-3#TRPBF LTGYG 8-Lead Plastic MSOP 40 C to 125 C.

7 #PBF #TRPBF LTHCJ 8-Lead Plastic MSOP 40 C to 125 C. #PBF #TRPBF LTHCJ 8-Lead Plastic MSOP 40 C to 125 C. LT6657 AHMS8-5#PBF LT6657 AHMS8-5#TRPBF LTGYH 8-Lead Plastic MSOP 40 C to 125 C. LT6657 BHMS8-5#PBF LT6657 BHMS8-5#TRPBF LTGYH 8-Lead Plastic MSOP 40 C to 125 C. *Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. Parts ending with PBF are RoHS and WEEE compliant. For more information on lead free part marking, go to: For more information on tape and reel specifications, go to: Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.

8 6657fd 2 For more information LT6657 . Available Options OUTPUT VOLTAGE INITIAL ACCURACY TEMPERATURE COEFFICIENT ORDER PART NUMBER** SPECIFIED TEMPERATURE RANGE. C 40 C to 125 C. 3ppm/ C 40 C to 125 C. C 40 C to 125 C. 3ppm/ C 40 C to 125 C. 3V C LT6657 AHMS8-3 40 C to 125 C. 3ppm/ C LT6657 BHMS8-3 40 C to 125 C. C 40 C to 125 C. 3ppm/ C 40 C to 125 C. 5V C LT6657 AHMS8-5 40 C to 125 C. 3ppm/ C LT6657 BHMS8-5 40 C to 125 C. ** See the Order Information section for complete part number listing. Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C.

9 The test conditions are VIN = VOUT + , VSHDN = , IOUT = 0, CIN = F, COUT = 1 F. For VSHDN = , CIN = 1 F, COUT = F, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS. Output Voltage Accuracy 0 %. Output Voltage Temperature Coefficient LT6657A l ppm/ C. (Note 4) LT6657B l 1 3 ppm/ C. Line Regulation (Note 5) VOUT + VIN 40V 2 ppm/V. l 4 ppm/V. Load Regulation (Note 5) IOUT (Source) = 10mA 2 6 V/mA. l 10 V/mA. IOUT (Sink) = 10mA 3 8 V/mA. l 15 V/mA. Shunt Configuration All, Except l 3 15 V/mA. VOUT Is Shorted to VIN. ISHUNT to 11mA.

10 Minimum VIN VOUT All, Except VIN VOUT, IOUT = 0mA 20 50 mV. VOUT = l 70 mV. IOUT (Source) = 1mA 65 100 mV. l 140 mV. IOUT (Source) = 10mA 330 450 mV. l 500 mV. IOUT (Sink) = 10mA 230 150 mV. l 50 mV. VIN VOUT, IOUT = 0mA 120 200 mV. VOUT = l 250 mV. IOUT (Source) = 1mA 120 200 mV. l 250 mV. IOUT (Source) = 10mA 330 450 mV. l 500 mV. IOUT (Sink) = 10mA 120 200 mV. l 250 mV. 6657fd For more information 3. LT6657 . Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C.