LT6658BHMSE-2.5 LINEAR | Alldatasheet
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Technical content
6658fFor more information www.linear .com/L T6658 Typical applicaTion FeaTures DescripTion Precision Dual Output, High Current, Low Noise, Voltage Reference The LT®6658 precision 2.5V dual output reference com- bines the performance of a low drift low noise reference and a linear regulator. Both outputs are ideal for driving the precision reference inputs of high resolution ADCs and DACs, even with heavy loading while simultaneously acting as output supplies powering microcontrollers and other supporting devices. Both outputs have the same precision specifications and track each other over temperature and load. Both outputs are nominally 2.5V, however each can be configured with external resistors to give an output voltage up to 6V. Using Kelvin connections, the LT6658 typically has 0.1ppm/mA load regulation with up to 150mA load current. A noise reduction pin is available to band-limit and lower the total integrated noise. Dual outputs provide flexibility for powering reference and regulator applications and localizing PCB routing. The outputs have excellent supply rejection and are stable with 1µF to 50µF capacitors. Short circuit and thermal protection help maintain stability and prevent thermal overstress. The LT6658 is offered in the MSE16 exposed pad package. Precision Dual Output 2.5V Reference and Supply Output Voltage Temperature Drift Both Outputs
applicaTions
n Dual Output T racking Reference n Each Output Configurable: 2.5V to 6V n Output 1: 150mA Source/20mA Sink n Output 2: 50mA Source/20mA Sink n Low Drift: n A-Grade: 10ppm/°C Max n B-Grade: 20ppm/°C Max n High Accuracy: n A-Grade: ±0.05% Max n B-Grade: ±0.1% Max n Low Noise: 1.5ppmP-P (0.1Hz to 10Hz) n Wide Operating Voltage Range to 36V n Load Regulation: 0.1ppm/mA n AC PSRR: 96dB at 10kHz n Kelvin Sense Connection on Outputs n Thermal Shutdown n Separate Supply Pins for Each Output n Available in Exposed Pad Package MSE16 n Microcontroller with ADC/DAC Applications n Data Acquisition Systems n Automotive Control and Monitoring n Precision Low Noise Regulators n Instrumentation and Process Control L, LT, LT C, LT M, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. 1µF 1µF1µF 0.1µF VIN 5V TO 36V VOUT2 2.5V 50mA V OUT1 2.5V 150mA
6658 TA01a
L T6658-2.5 RLOAD2 VIN1 VIN2 VIN OD BYPASS VOUT2_F VOUT2_S VOUT1_F VOUT1_S GND RLOAD1 I LOAD1 = 150mA V OUT1 V OUT2 TEMPERATURE (°C) –50 –25 100 125 150 2.498 2.499 2.500 2.501 2.502 OUTPUT VOL TAGE (V)
6658 TA01b
6658f For more information www.linear .com/L T6658 pin conFiguraTionabsoluTe MaxiMuM raTings Supply Voltages Input Voltages VOUT1_S, VOUT2_S, NR, BYPASS to GND .. –0. 3V to 6V Output Voltages Input Current BY 0mA definite Specified Temperature Range Operating Junction Temperature Range . – 55°C to 150°C 5°C to 150°C Lead Temperature (Soldering, 10 sec) (Note 1) GND GND BYPASS DNC NR GND V OUT2_S VOUT2_F DNC NC V IN VOUT1_S VOUT1_F VIN1 VIN2 OD TOP VIEW MSE PACKAGE 16-LEAD PLASTIC MSOP GND TJMAX = 150°C, θJC = 10°C/W, θJA = 35°C/W DNC: CONNECTED INTERNALL Y DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB orDer inForMaTion TUBE TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED JUNCTION TEMPERATURE RANGE LT6658AIMSE-2.5#PBF LT6658AIMSE-2.5#TRPBF 665825 16-Lead Plastic MSOP –40°C to 85°C LT6658BIMSE-2.5#PBF LT6658BIMSE-2.5#TRPBF 665825 16-Lead Plastic MSOP –40°C to 85°C LT6658AHMSE-2.5#PBF LT6658AHMSE-2.5#TRPBF 665825 16-Lead Plastic MSOP –40°C to 125°C LT6658BHMSE-2.5#PBF LT6658BHMSE-2.5#TRPBF 665825 16-Lead Plastic MSOP –40°C to 125°C *The temperature grade is identified by a label on the shipping container. Consult LT C 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: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ http://www.linear.com/product/LT6658#orderinfo
6658fFor more information www.linear .com/L T6658
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS Output Voltage Accuracy LT6658A LT6658B LT6658AI LT6658BI LT6658AH LT6658BH l l l l –0.05 –0.1 –0.175 –0.35 –0.215 –0.43 0.05 0.1 0.175 0.35 0.215 0.43 Output V oltage Temperature Coefficient (Note 4) LT6658A LT6658B l l ppm/°C ppm/°C Line Regulation (Note 5) VOUT + 2.5V ≤ VIN ≤ 36V, VIN = VIN1 = VIN2 l 1.4 4.5 ppm/V ppm/V Load Regulation (Note 5) Output 1 Sourcing, ΔILOAD = 0mA to 150mA l 0.1 0.5 0.8 ppm/mA ppm/mA Output 2 Sour cing, ΔILOAD = 0mA to 50mA (Note 6) l 0.1 1.3 1.5 ppm/mA ppm/mA Output 1 Sinking, ΔILOAD = 0mA to 20mA l 0.1 2.2 2.5 ppm/mA ppm/mA Output 2 Sinking, ΔILOAD = 0mA to 20mA l 0.1 2.2 2.5 ppm/mA ppm/mA VIN Minimum Voltage ΔV OUT = 0.1%, IOUT = 0mA, VIN1 = VIN2 = VOUT + 2.5V l 3.5 3.9 4.25 V V V IN1 Dropout Voltage ΔV OUT = 0.1%, IOUT = 0mA, VIN = VIN2 = VOUT + 2.5V ΔVOUT = 0.1%,IOUT = 150mA,VIN = VIN2 = VOUT + 2.5V l 2.0 2.2 2.3 2.5 V V V IN2 Dropout Voltage ΔV OUT = 0.1%, IOUT = 0mA, VIN = VIN1 = VOUT + 2.5V ΔVOUT = 0.1%, IOUT = 50mA, VIN = VIN1 = VOUT + 2.5V l 1.8 2.2 2.5 V V Supply Current V OD = 5V, No Load VOD = 0.8V, No Load l l 1.9 1.0 3.0 1.2 mA mA Output Short-Cir cuit Current Short V OUT1_F to GND Short VOUT2_F to GND l l 170 270 120 mA mA Output Noise V oltage (Note 7) 0.1Hz ≤ f ≤ 10Hz 1.5 ppmP–P 10Hz ≤ f ≤ 1kHz, COUT = 1µF, CNR = 10µF, ILOAD = Full Current (Note 9) Frequency = 1kHz, COUT1 = 1µF, CNR = 10µF, ILOAD = Full Current (Note 9) ppmRMS nV/√Hz Output Voltage T racking T racking = Output 1 – Output 2 0.9 µV/°C VOUT1_S, VOUT2_S Pin Current Unity Gain 135 nA OD Threshold Voltage Logic High Input Voltage Logic Low Input Voltage l l 0.8 V V OD Pin Current VOD = 0V VOD = 36V l l 0.3 1.5 μA μA The l denotes the specifications which apply over the full specified temperature range, otherwise specifications are at TA = 25°C. VIN = VIN1 = VIN2 = VOUT1,2_F + 2.5V, COUT1,2 = 1µF, ILOAD = 0, unless otherwise noted. available opTions OUTPUT VOL TAGE INITIAL ACCURACY TEMPERATURE COEFFICIENT SPECIFIED JUNCTION TEMPERATURE RANGE 2.500V 0.05% 10ppm/°C –40°C to 85°C 0.1% 20ppm/°C –40°C to 85°C 0.05% 10ppm/°C –40°C to 125°C 0.1% 20ppm/°C –40°C to 125°C
6658f For more information www.linear .com/L T6658 elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = VIN1 = VIN2 = VOUT1,2_F + 2.5V, COUT1,2 = 1µF, ILOAD = 0, unless otherwise noted. Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Thermal hysteresis can occur during storage at extreme temperatures. Note 3: The stated temperature is typical for soldering of the leads during manual rework. For detailed IR reflow recommendations, refer to the Applications Information section. Note 4: Temperature coefficient is measured by dividing the maximum change in output voltage by the specified temperature range. Note 5: Line and load regulation are measured on a pulse basis for specified input voltage or load current ranges. Output changes due to die temperature change must be taken into account separately. Note 6: V OUT2 load regulation specification is limited by practical automated test resolution. Please refer to the Typical Performance Characteristics section for more information regarding actual typical performance. Note 7: Peak-to-peak noise is measured with a 1-pole highpass filter at 0.1Hz and 2-pole lowpass filter at 10Hz. The unit is enclosed in a still-air environment to eliminate thermocouple effects on the leads. The test PARAMETER CONDITIONS MIN TYP MAX UNITS Ripple Rejection VIN1 = VOUT1 + 3V, VRIPPLE = 0.5VP–P, fRIPPLE = 120Hz, ILOAD = 150mA, COUT1 = 1µF, CNR = 10µF VIN2 = VOUT2 + 3V, VRIPPLE = 0.5VP–P, fRIPPLE = 120Hz, ILOAD = 50mA, COUT2 = 1µF, CNR = 10µF 107 107 dB dB Turn-On T ime 0.1% Settling, CLOAD = 1μF 160 μs Long Term Drift (Note 8) 120 ppm/√kHr Thermal Hysteresis (Note 9) ΔT = –40°C to 85°C ΔT = –40°C to 125°C ppm ppm time is 10 seconds. RMS noise is measured on a spectrum analyzer in a shielded environment where the intrinsic noise of the instrument is removed to determine the actual noise of the device. Note 8: Long-term stability typically has a logarithmic characteristic and therefore, changes after 1000 hours tend to be much smaller than before that time. Total drift in the second thousand hours is normally less than one third that of the first thousand hours with a continuing trend toward reduced drift with time. Long-term stability will also be affected by differential stresses between the IC and the board material created during board assembly. Note 9: Hysteresis in output voltage is created by package stress that differs depending on whether the IC was previously at a higher or lower temperature. Output voltage is always measured at 25°C, but the IC is cycled to the hot or cold temperature limit before successive measurements. Hysteresis measures the maximum output change for the averages of three hot or cold temperature cycles. For instruments that are stored at well controlled temperatures (within 20 or 30 degrees of operational temperature), it’s usually not a dominant error sour ce. Typical hysteresis is the worst-case of 25°C to cold to 25°C or 25°C to hot to 25°C, preconditioned by one thermal cycle. Note 10: The full current for I LOAD is 150mA and 50mA for Output 1 and Output 2, respectively.
6658fFor more information www.linear .com/L T6658 2.5V VOUT1 Load Regulation, Sourcing 2.5V VOUT2 Load Regulation, Sourcing 2.5V VOUT1 Load Regulation, Sinking 2.5V VOUT2 Load Regulation, Sinking 2.5V Line Regulation VOUT1 2.5V Line Regulation VOUT2 2.5V VOUT1 Output Voltage Temperature Drift 2.5V VOUT2 Output Voltage Temperature Drift 2.5V VOUT1 and VOUT2 Output Voltage vs Temperature with 150mA Load on VOUT1 TA = 25°C, VIN = VIN1 = VIN2 = VOUT1_F + 2.5V = VOUT2_F + 2.5V, COUT1 = COUT2 = 1µF, ILOAD = 0mA, unless otherwise noted. Typical perForMance characTerisTics THREE TYPICAL PARTS TEMPERATURE (°C) –50 –25 100 125 150 2.498 2.499 2.500 2.501 2.502 OUTPUT VOL TAGE (V)
6658 G01
TEMPERATURE (°C) –50 –25 100 125 150 2.498 2.499 2.500 2.501 2.502 OUTPUT VOL TAGE (V)
6658 G02
I LOAD1 = 150mA V OUT1 V OUT2 TEMPERATURE (°C) –50 –25 100 125 150 2.498 2.499 2.500 2.501 2.502 OUTPUT VOL TAGE (V)
6658 G03
125°C 25°C –40°C OUTPUT CURRENT (mA) 0.1 100 500 –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 OUTPUT VOL TAGE CHANGE (ppm)
6658 G04
125°C 25°C –40°C OUTPUT CURRENT (mA) 0.1 100 –25 –20 –15 –10 OUTPUT VOL TAGE CHANGE (ppm)
6658 G05
125°C 25°C –40°C OUTPUT CURRENT (mA) 100 OUTPUT VOL TAGE CHANGE (ppm)
6658 G06
125°C 25°C –40°C OUTPUT CURRENT (mA) 0.1 100 OUTPUT VOL TAGE CHANGE (ppm)
6658 G07
125°C 25°C –40°C INPUT VOL TAGE (V) 2.496 2.497 2.498 2.499 2.500 2.501 2.502 OUTPUT VOL TAGE (V)
6658 G08
125°C 25°C –40°C INPUT VOL TAGE (V) 2.496 2.497 2.498 2.499 2.500 2.501 2.502 OUTPUT VOL TAGE (V)
6658 G09
6658f For more information www.linear .com/L T6658 2.5V Minimum VIN to VOUT1 Differential, Sourcing 2.5V Minimum VIN to VOUT2 Differential, Sourcing 2.5V VOUT1 Power Supply Rejection Ratio vs Frequency 2.5V VOUT2 Power Supply Rejection Ratio vs Frequency 2.5V VOUT1 Power Supply Rejection Ratio vs Frequency 2.5V VOUT2 Power Supply Rejection Ratio vs Frequency 2.5V Output Accuracy Histogram 2.5V Supply Current vs Input Voltage 2.5V Output Disable (OD) Low Supply Current vs Input Voltage TA = 25°C, VIN = VIN1 = VIN2 = VOUT1_F + 2.5V = VOUT2_F + 2.5V, COUT1 = COUT2 = 1µF, ILOAD = 0mA, unless otherwise noted. Typical perForMance characTerisTics INPUT VOL TAGE (V) 0.5 1.0 1.5 2.0 2.5 SUPPL Y CURRENT (mA)
6658 G11
125°C 25°C –40°C 125°C 25°C –40°C INPUT VOL TAGE (V) 0.2 0.4 0.6 0.8 1.0 1.2 1.4 SUPPL Y CURRENT (mA)
6658 G12
125°C 25°C –40°C INPUT–OUTPUT VOL TAGE (V) 1.1 1.4 1.6 1.9 2.1 0.1 100 200 OUTPUT CURRENT (mA)
6658 G13
C OUT1 = 1µF I LOAD = 0A V IN = V IN1 = V IN2 = 6V C NR = 1µF C NR = 10µF FREQUENCY (kHz) 0.01 0.1 100 1000 100 120 PSRR (dB)
6658 G15
C OUT2 = 1µF I LOAD = 0A V IN = V IN1 = V IN2 = 6V C NR = 1µF C NR = 10µF FREQUENCY (kHz) 0.01 0.1 100 1000 100 120 PSRR (dB)
6658 G16
C NR = 10µF C OUT1 = 1µF V IN = V IN1 = V IN2 = 6V I LOAD1 = 0A I LOAD1 = 150mA FREQUENCY (kHz) 0.01 0.1 100 1000 100 120 PSRR (dB)
6658 G17
C NR = 10µF C OUT1 = 1µF V IN = V IN1 = V IN2 = 6V I LOAD = 0A I LOAD = 50mA FREQUENCY (kHz) 0.01 0.1 100 1000 100 120 PSRR (dB)
6658 G18
V OUT1 (V) 2.4985 2.4990 2.4995 2.5000 2.5005 2.5010 2.5015 NUMBER OF UNITS
6658 G10
125°C 25°C –40°C INPUT–OUTPUT VOL TAGE (V) 1.1 1.3 1.5 1.7 1.9 2.1 0.1 100 OUTPUT CURRENT (mA)
6658 G14
6658fFor more information www.linear .com/L T6658 2.5V VOUT2 AC Output Impedance 50mA Load 2.5V VOUT2 AC Output Impedance 1mA Load 2.5V VOUT1 AC Output Impedance 10mA Load 2.5V VOUT1 AC Output Impedance 150mA Load TA = 25°C, VIN = VIN1 = VIN2 = VOUT1_F + 2.5V = VOUT2_F + 2.5V, COUT1 = COUT2 = 1µF, ILOAD = 0mA, unless otherwise noted. Typical perForMance characTerisTics I OUT1 = 10mA C OUT1 = 1µF C OUT1 = 50µF FREQUENCY (kHz) 0.01 0.1 100 1000 0.0001 0.001 0.01 0.1 OUTPUT IMPEDANCE (Ω)
6658 G19
I OUT1 = 150mA C OUT1 = 1µF C OUT1 = 50µF FREQUENCY (kHz) 0.01 0.1 100 1000 0.0001 0.001 0.01 0.1 OUTPUT IMPEDANCE (Ω)
6658 G20
I OUT2 = 50mA C OUT2 = 1µF C OUT2 = 50µF FREQUENCY (kHz) 0.01 0.1 100 1000 0.0001 0.001 0.01 0.1 OUTPUT IMPEDANCE (Ω)
6658 G22
V IN V BYPASS V OUT1 V OUT2 C NR = OPEN C OUT1 = 1µF C OUT2 = 1µF 50µs/DIV 2V/DIV 5V/DIV 2V/DIV 2V/DIV
6658 G23
I OUT1 V OUT2 C NR = 0.1µF C OUT1 = 1µF C OUT2 = 1µF 10µs/DIV 150mA 10mA 100µV/DIV
6658 G27
I OUT2 = 1mA C OUT2 =1µF C OUT2 = 50µF FREQUENCY (kHz) 0.01 0.1 100 1000 0.0001 0.001 0.01 0.1 OUTPUT IMPEDANCE (Ω)
6658 G21
2.5V Turn-On Characteristic 2.5V Channel to Channel Isolation VIN2 to VOUT1 2.5V Channel to Channel Isolation V IN1 to VOUT2 2.5V Channel to Channel Load Regulation (Effects of Heating Removed) 2.5V Channel to Channel Isolation, Time Domain C OUT1 = 1µF / C NR = OPEN C OUT1 = 10µF / C NR =10µF C OUT1 = 50µF / C NR =10µF V IN = V IN1 = 7V V IN2 = 6VDC + 700mV RMS I LOAD1 = I LOAD2 = 0A, T A = 25°C FREQUENCY (kHz) 0.01 0.1 100 100 120 140 160 V OUT1 CHANNEL TO CHANNEL ISOLATION (dB)
6658 G24
C OUT2 = 1µF / C NR = OPEN C OUT2 = 10µF / C NR =10µF C OUT2 = 50µF / C NR = 10µF V IN = V IN2 = 7V V IN1 = 6VDC + 700mV RMS I LOAD1 = I LOAD2 = 0A, T A = 25°C FREQUENCY (kHz) 0.01 0.1 100 100 120 140 V OUT2 CHANNEL TO CHANNEL ISOLATION (dB)
6658 G25
V OUT1 LOAD CURRENT (mA) 100 500 V OUT2 VOL TAGE CHANGE (ppm)
6658 G26
6658f For more information www.linear .com/L T6658 TA = 25°C, VIN = VIN1 = VIN2 = VOUT1_F + 2.5V = VOUT2_F + 2.5V, COUT1 = COUT2 = 1µF, ILOAD = 0mA, unless otherwise noted. Typical perForMance characTerisTics 2.5V VOUT1_S Pin Input Current vs Temperature 2.5V OD Pin Current vs OD Pin Input Voltage 2.5V T racking (VOUT1 – VOUT2) vs Temperature THREE TYPICAL PARTS TEMPERATURE (°C) –50 –25 100 125 150 100 125 150 175 200 225 250 V OUT1_S PIN CURRENT (nA)
6658 G28
TEMPERATURE (°C) –60 –40 –20 100 120 140 –250 –200 –150 –100 –50 100 150 200 250 V OUT1 – V OUT2 (µV)
6658 G30
V IN (V) –150 –120 –90 –60 –30 120 150 V OUT1 – V OUT2 (µV)
6658 G31
V OUT1 LOAD CURRENT (mA) 0.01 0.1 100 –200 –160 –120 –80 –40 120 160 200 V OUT1 – V OUT2 (µV)
6658 G32
(2µV/DIV)
6658 G33
2.5V T racking (VOUT1 – VOUT2) vs Input Voltage 2.5V T racking (VOUT1 – VOUT2) vs VOUT1 Load Current 2.5V VOUT1 Output Noise 0.1Hz to 10Hz 2.5V VOUT1 Output Voltage Noise Spectrum ILOAD = 0mA 2.5V VOUT2 Output Voltage Noise Spectrum ILOAD = 0mA OD PIN INPUT VOL TAGE (V) 0.1 100 OD PIN INPUT CURRENT (µA)
6658 G29
125°C 25°C –40°C 2.5V VOUT2 Output Noise 0.1Hz to 10Hz 1s/DIV OUTPUT NOISE (2µV/DIV)
6658 G34
C OUT1 = 1µF C NR = OPEN C NR = 10µF FREQUENCY (kHz) 0.01 0.1 100 1000 120 180 240 300 NOISE VOL TAGE (nV/√ Hz
6658 G35
FREQUENCY (kHz) 0.01 0.1 100 1000 120 180 240 300 NOISE VOL TAGE (nV/√ Hz
6658 G36
C NR = OPEN C NR = 10µF C OUT2 = 1µF
6658fFor more information www.linear .com/L T6658 TA = 25°C, VIN = VIN1 = VIN2 = VOUT1_F + 2.5V = VOUT2_F + 2.5V, COUT1 = COUT2 = 1µF, ILOAD = 0mA, unless otherwise noted. Typical perForMance characTerisTics 2.5V VOUT1 Output Voltage Noise Spectrum ILOAD = 150mA 2.5V Line T ransient Response 2.5V Line T ransient Response 2.5V Line T ransient Response 2.5V VOUT2 Output Voltage Noise Spectrum ILOAD = 50mA 2.5V VOUT1 Integrated Noise ILOAD = 0mA 2.5V VOUT2 Integrated Noise ILOAD = 0mA 2.5V VOUT1 Integrated Noise ILOAD = 150mA 2.5V VOUT2 Integrated Noise ILOAD = 50mA C OUT1 = 1µF FREQUENCY (kHz) 0.01 0.1 100 1000 100 150 200 250 300 NOISE VOL TAGE (nV/√ Hz
6658 G37
C NR = OPEN C NR = 10µF C OUT2 = 1µF C NR = OPEN C NR = 10µF FREQUENCY (kHz) 0.01 0.1 100 1000 100 150 200 250 300 NOISE VOL TAGE (nV/√ Hz
6658 G38
C OUT1 = 1µF I LOAD = 0mA C NR = 0PEN C NR = 10µF FREQUENCY (kHz) 0.01 0.1 100 1000 INTEGRATED NOISE (µV RMS
6658 G39
C OUT2 = 1µF I LOAD = 0mA C NR = OPEN C NR =10µF FREQUENCY (kHz) 0.01 0.1 100 1000 INTEGRATED NOISE (µV RMS
6658 G40
C OUT1 = 1µF I LOAD = 150mA C NR = OPEN C NR = 10µF FREQUENCY (kHz) 0.01 0.1 100 1000 INTEGRATED NOISE (µV RMS
6658 G41
C OUT2 = 1µF I LOAD = 50mA C NR = OPEN C NR = 10µF FREQUENCY (kHz) 0.01 0.1 100 1000 INTEGRATED NOISE (µV RMS
6658 G42
V IN V BYPASS V OUT1 V OUT2 V IN = 5V to 5.5V I LOAD = 0mA C NR = OPEN C OUT1 = C OUT2 = 1µF 50µs/DIV 500mV/DIV 2mV/DIV 2mV/DIV 2mV/DIV
6658 G43
V IN V BYPASS V OUT1 V OUT2 V IN = 5V to 5.5V I LOAD = 0mA C NR = 1µF C OUT1 = C OUT2 = 1µF 50µs/DIV 500mV/DIV 2mV/DIV 2mV/DIV 2mV/DIV
6658 G44
V IN V BYPASS V OUT1 V OUT2 V IN = 5V to 5.5V I LOAD = 50mA C NR = 1µF C OUT1 = C OUT2 = 1µF 50µs/DIV 500mV/DIV 2mV/DIV 2mV/DIV 2mV/DIV
6658 G45
6658f For more information www.linear .com/L T6658 TA = 25°C, VIN = VIN1 = VIN2 = VOUT1_F + 2.5V = VOUT2_F + 2.5V, COUT1 = COUT2 = 1µF, ILOAD = 0mA, unless otherwise noted. Typical perForMance characTerisTics VOUT1 Current Limit VOUT2 Current Limit Current Limit vs Supply Voltage V IN = 5V V IN = 7.5V V IN = 10V TEMPERATURE (°C) –60 –40 –20 100 120 140 100 150 200 250 300 350 400 450 500 CURRENT LIMIT (mA)
6658 G46
V IN = 5V V IN = 10V TEMPERATURE (°C) –60 –40 –20 100 120 140 100 120 140 160 CURRENT LIMIT (mA)
6658 G47
I OUT1 I OUT2 SUPPL Y VOL TAGE (V) 100 150 200 250 300 350 400 450 500 CURRENT LIMIT (mA)
6658 G48
6658fFor more information www.linear .com/L T6658 pin FuncTions GND (Pins 1, 2, 6, Exposed Pad Pin 17): These pins are the main ground connections and should be connected into a star ground or ground plane. The exposed pad must be soldered to ground for good electrical contact and rated thermal performance. BYPASS (Pin 3): Bypass Pin. This requires a 1μF capacitor for bandgap stability. DNC (Pin 4, 16): Do Not Connect. Keep leakage current from these pins to a minimum. NR (Pin 5): Noise Reduction Pin. To band limit the noise of the reference, connect a capacitor between this pin and ground. See Applications Information section. V OUT2_S (Pin 7): V OUT2 Sense Pin. Connect this Kelvin sense pin at the load. V OUT2_F (Pin 8): V OUT2 Output Voltage. A 1μF to 50μF output capacitor is required for stable operation. This output can source up to 50mA. OD (Pin 9): Output Disable. This active low input disables both outputs. VIN2 (Pin 10): Input Voltage Supply for Channel 2. Bypass VIN2 with 0.1μF capacitor to ground. This pin supplies power to buffer amplifier 2. V IN1 (Pin 11): Input Voltage Supply for Channel 1. Bypass VIN1 with 0.1μF capacitor to ground. This pin supplies power to buffer amplifier 1. V OUT1_F (Pin 12): V OUT1 Output Voltage. A 1μF to 50μF output capacitor is required for stable operation. This output can source up to 150mA. V OUT1_S (Pin 13): V OUT1 Sense Pin. Connect this Kelvin sense pin at the load. V IN (Pin 14): Input Voltage Supply. Bypass VIN with 0.1μF capacitor to ground. NC (Pin 15): No Connect.
6658f For more information www.linear .com/L T6658 block DiagraM 800/uni03A9 800/uni03A9 400Ω V IN THERMAL SHUTDOWN DNC DNC NC GND GND GND GND OD V IN2 V IN1 V OUT2_F V OUT1_F V OUT2_S V OUT1_S NR BYPASS 6658 BD BANDGAP
the buffers are trimmed for low drift and high accuracy. supply pins and drive them with independent supplies. on buffer 1 and the resulting output waveforms are shown. DAC, it is important the two buffer outputs are isolated. or through a separate trace terminating at a star ground. need the minimum specified voltage for proper operation.
6658 F01
Figure 1. LT6658 Current Flow through the Supply Pins
6658 F02
Figure 2. 10mA to 150mA Load Step on VOUT1
a single 0.1µF and single 10µF capacitor can be used. The BYPASS pin requires a 1µF capacitor for stability. tion, specified input voltage, or specified temperature. value as operating conditions change. loses almost 75% of its value at its rated voltage of 10V.
6658 F03
Figure 3. Capacitance Value of a 1µF X7R Over Its Full Rated Voltage results keep the ESR at or below 0.2Ω. is repeated with a 150mA load. in parallel can be used on the output pins. The buffers will be stable, and the bandwidth will be lower.
6658 F04
Figure 4. LT6658 Closed Loop Response of the
6658 F05
Figure 5. LT6658 Closed Loop Response of the The Channel 2 output buffer has a similar response. capacitor to the NR pin will also affect turn-on time.
6658 F06
Figure 6. Start-Up Response on the BYPASS and VOUT1_F Pins steps are shown in Figures 8, 9, and 10.
6658 F07
Figure 7. Load Current Response Time Test Circuit the size of the output capacitor.
6658 F08
Figure 8. LT6658-2.5 Output 1 Response to 75mA Load Step
6658 F09
Figure 9. LT6658-2.5 Output 1 Response to 140mA Load Step
6658 F10
Figure 10. LT6658-2.5 Output 2 Response to 40mA Load Step avoiding any resistive parasitic in the high current path. be connected as close as possible to the chip ground. resistor possibly causing a small VOS drift.
6658 F11
Figure 11. The LT6658-2.5 with Output 2 Configured for a 5V Output is unlikely to cause a significant error or drift.
6658 F12
Figure 12. How to Make a Proper Kelvin Sense Connection of the bandgap noise and the noise of the buffer amplifier. corner attenuating the out-of-band noise of the bandgap.
6658 F13
Figure 13. LT6658 Bandgap Output Voltage Noise Table 1. NR Capacitor Values and the Corresponding 3dB Frequency Table 2. Settling Times for Different NR Capacitor Values
6658 F14
Figure 14. Start-up Response on the NR pin and VOUT_F
6658 F15
Figure 15. LT6658-2.5 Total Integrated Output Voltage Noise
6658 F16
Figure 16. LT6658-2.5 VOUT2 Integrated Noise with CNR = 22µF the output noise for different conditions. Characteristics section for more information. Table 3. Output Noise and Ripple Rejection Typical Values LOAD is 150mA and 50mA for output 1 and output 2, respectively.
achieved when the supply pins are independently powered. several conditions of power supply rejection. tion, asserting this pin will remove the output current. voltage is greater than 2V the LT6658 is enabled. ments, it is recommended that OD be tied high explicitly.
6658 F17
Figure 17. The Output Disable Function output current and die temperature. operation once the die temperature drops below 154°C. channel will affect the output of both channels. MSE package will need to dissipate over 7 watts of power. copper on the PCB that is soldered to the exposed pad. be as low as 35°C/W for the MSE package. ent, and PTOTAL is the total power dissipated in the LT6658. would exceed the specified H-grade temperature of 125°C. Figure 18. Three different θJA curves are shown. θJA
6658 F18
Figure 18. MSE Derating Curve power dissipated within the remaining internal circuits. where PTOTAL is the total power dissipated in the package. PSTATIC tends to be much smaller than P1 or P2. 100°C when proper heat sinking is used. will reduce the power dissipated in the LT6658 package. be avoided if possible. See the Thermal Hysteresis section.
6658 F19
Figure 19. Power Dissipation vs Output Current can damage the output devices.
6658 F20
Figure 20. Power Dissipation vs Supply Voltage dissipated through the package without damaging the part.
6658 F21
Figure 21. SOA for the LT6658 supply voltage must be reduced as not to exceed TJMAX. The bottom right is the maximum voltage of the LT6658. at this limit for extended periods of time. should have 0.1µF capacitor placed close to the package. to use plenty of copper and multiple vias. is sinking current. This minimizes load regulation errors.
6658 F22
Figure 23 is representative of the LT6658 long term drift.
6658 F23
Figure 23. LT6658 Long Term Drift is run through an IR reflow oven once and three times.
6658 F24
Figure 24. Lead Free Reflow Profile
1 CYCLE
3 CYCLES
6658 F25
Figure 25. ∆VOUT1 Due to IR Reflow Shift
6658 F26a
6658 F26b
Figure 26. Thermal Hysteresis
6658f For more information www.linear .com/L T6658 Typical applicaTions 200mA Reference Single Supply Precision Data Acquisition Circuit 2µF1µF 0.1µF 5.15V < VIN < 36V RLOAD
6658 TA02
0.03/uni03A9 0.01/uni03A9 L T6658-2.5 VIN1 VIN2 VIN OD BYPASS V OUT2_F VOUT2_S VOUT1_F VOUT1_S GND 1, 2, 6, 17
6658 TA03
VCM V– V+ 3 35.7/uni03A9 3300pF 35.7/uni03A9 VCM 0.41V 3.69V 0.41V 3.69V 4.096V 6.6V 47µF 10µF L TC2378-20 REF/DGC IN+ REF V DD 2.5V IN– –3.28V 3.28V 6800pF 6800pF L TC6362 13.7k 21.5k 10µF 1µF L T6658-2.5 VIN1 VIN2 VIN OD VOUT2_F VOUT2_S 1, 2, 6, 17 GND BYPASS VOUT1_F VOUT1_S 0.1µF
6658fFor more information www.linear .com/L T6658 LT6658 Driving Tw o Code Dependent DAC Reference Inputs. Separate DAC Reference Biasing Eliminates Code Dependent Reference Current Interaction Typical applicaTions LT6658 Driving the LTC2323-16 Dual ADC with Independent Voltage References 5V TO 36V 0.1µF 7.5V TO 36V 0.1µF 10µF 10µF 10k 10k 2.5V L TC2323-16 GND
6658 TA04
1µF 1µF 1µF L T6658-2.5 VIN VIN1
10 VOUT2_F
VOUT2_S GNDBYPASS 1, 2, 6, 17 VOUT1_F VOUT1_S 8VIN2 VREF 2.5V5V VDD L TC2641-16 4.7µF REF VOUT GND
6658 TA05
1µF 0.1µF 2 CS SCLK DIN CLR V DD L TC2641-16 REF 6VOUT GND RPAR* CS SCLK DIN CLR VREF 2.5V5V 4.7µF 0.1µF RPAR* 5V < VIN < 36V L T6658-2.5 VIN VIN1 VIN2 V OUT2_F VOUT2_S GND 1, 2, 6, 17 V OUT1_F VOUT1_S BYPASS 16-BIT DAC *RPAR IS THE PARASITIC RESISTANCE OF THE BOARD TRACE AND SHOULD BE > 0.048/uni03A9 TO MAINTAIN GOOD INL 16-BIT DAC 0.1µF
6658f For more information www.linear .com/L T6658 Typical applicaTions R1 AND R2 TOLERANCE (%) RPAR (Ω) ILOAD (mA) ± ERROR (mV) 1 0.05 0 35.4 1 0.05 150 42.9 0.1 0.05 0 3.5 0.1 0.05 150 11.0 0.1 0.02 150 6.5 0.1 0.01 150 5.0 R1 AND R2 TOLERANCE ERRORS ADDED ROOT-SUM-SQUARE Common Errors for Non-Unity Gain Applications L T6658-2.5
6658 TA06
1µF 1µF 0.1µF BYPASS 1µF 7.5V TO 36V KELVIN SENSE ERROR: RPAR WILL CAUSE AN ERROR VERROR = ILOAD • RPAR. CONNECT THE TOP OF R1 DIRECTL Y TO THE TOP OF RLOAD. RESISTOR TOLERANCE ERROR: GAIN NETWORK ERROR CAN BE REDUCED BY USING A MATCHED RESISTOR NETWORK SUCH AS THE L T5400. VERROR = ILOAD • RPAR 1µF GNDGND GND THERMAL SHUTDOWN BANDGAP VIN2 VIN1VIN VOUT2_F VOUT1_F VOUT2_S VOUT1_S 14 10 11 GND 17 6 10k 10k ILOAD RLOAD RPAR VIDEAL = 5V LOAD CURRENT (mA) Load Voltage Error Due to Parasitic Resistance LOAD VOL TAGE ERROR (mV) 100 0.1 -10 10 30 110 130 15050 70 90 0.1/uni03A9 0.05/uni03A9 0.01/uni03A9
6658fFor more information www.linear .com/L T6658 Typical applicaTions 1µF 10µF 0.1µF10µF 10µF 0.1µF 7.5V TO 36V
6658 TA08
1µF1µF 1µF1µF L T6658-2.5 VIN1 VIN2 VIN OD BYPASS V OUT2_F VOUT2_S VOUT1_F VOUT1_S GND GND (PAD) 1, 2, 6 17 VREF+ VREF– VIN+ VIN– VCC GND L TC2440 335/uni03A9 335/uni03A9 335/uni03A9 1µF VREF+ VREF– VIN+ VIN– VCC GND L TC2440 335/uni03A9 335/uni03A9 335/uni03A9 1µF VREF+ VREF– VIN+ VIN– VCC GND L TC2440 335/uni03A9 335/uni03A9 335/uni03A9 1µF VREF+ VREF– VIN+ VIN– VCC GND L TC2440 335/uni03A9 335/uni03A9 335/uni03A9 1µF 10k 2.5V 10k L TC2440 AND STRAIN GAUGE BIAS Automotive Reference and Supply Voltage Application LT6658 Biasing Multiple Strain Gauges 1µF 1µF 1µF 1µF 0.1µF 12V BATTERY 2.5V 50mA REFERENCE VOL TAGE 5V 150mA SUPPL Y VOL TAGE
6658 TA07
L T6658-2.5 VIN VIN1 VIN2 OD BYPASS V OUT2_F VOUT2_S VOUT1_F VOUT1_S GND 1, 2, 6, 17
6658f For more information www.linear .com/L T6658 Typical applicaTions Recursive Reference Application (VOUT1 Supplies Power to VIN and VIN2) Low Drift Regulator Application Precision Low Drift Application Drift = 1.5ppm/°C; –40°C to 125°C Recursive Reference Power Supply Rejection Ratio 1µF 1µF 1µF 400/uni03A9 1µF 10k 10k 1.5k 10µF 10µF V IN 7.5V TO 36V V OUT1_F V IN1 BYPASS L T6658-2.5 V OUT1_S V OUT2_F V IN2 BANDGAP 2.5V V OUT2_S GND NR V OUT2 V OUT1 4.7V 1N5230 1N4148 1N4148
6658 TA09a
1, 2, 6, 17 1014 FREQUENCY (kHz) 0.001 0.01 0.1 100 100 120 140 POWER SUPPL Y REJECTION RATIO (dB)
6658 TA09b
1µF 1µF 1µF 1µF 400/uni03A9 1µF SHDN IN GND OUT S OUT F L TC6655-2.5 V IN 5V TO 13.2V V OUT1_F V IN1 BYPASS L T6658-2.5 V OUT1_S V OUT2_F V IN2 BANDGAP 2.5V V OUT2_S GND
6658 TA10a
V OUT2 V OUT1 2.5V 14 11 10 1,2,6,1753 NR V OUT1 V OUT2 TEMPERATURE (°C) –40 –20 100 120 140 2.498 2.499 2.500 2.501 2.502 OUTPUT VOL TAGE (V)
6658 TA10b
6658fFor more information www.linear .com/L T6658 package DescripTion MSOP (MSE16) 0213 REV F 0.53 ±0.152 (.021 ±.006) SEATING PLANE 0.18 (.007) 1.10 (.043) MAX 0.17 –/uni00A00.27 (.007 – .011) TYP 0.86 (.034) REF 0.50 (.0197) BSC 16151413121110 1 2 3 4 5 6 7 8 1 8 NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 6. EXPOSED PAD DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH ON E-PAD SHALL NOT EXCEED 0.254mm (.010") PER SIDE. 0.254 (.010) 0° – 6° TYP DETAIL “A” DETAIL “A” GAUGE PLANE 5.10 (.201) MIN 3.20 – 3.45 (.126 – .136) 0.889 ±0.127 (.035 ±.005) RECOMMENDED SOLDER PAD LAYOUT 0.305 ±0.038 (.0120 ±.0015) TYP 0.50 (.0197) BSC BOTTOM VIEW OF EXPOSED PAD OPTION 2.845 ±0.102 (.112 ±.004) 2.845 ±0.102 (.112 ±.004) 4.039 ±0.102 (.159 ±.004) (NOTE 3) 1.651 ±0.102 (.065 ±.004) 1.651 ±0.102 (.065 ±.004) 0.1016 ±0.0508 (.004 ±.002) 3.00 ±0.102 (.118 ±.004) (NOTE 4) 0.280 ±0.076 (.011 ±.003) REF 4.90 ±0.152 (.193 ±.006) DETAIL “B” DETAIL “B” CORNER TAIL IS PART OF THE LEADFRAME FEATURE. FOR REFERENCE ONL Y NO MEASUREMENT PURPOSE
0.12 REF
0.35 REF 16-Lead Plastic MSOP, Exposed Die Pad (Reference LTC DWG # 05-08-1667 Rev F) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. Please refer to http://www.linear.com/product/LT6658#packaging for the most recent package drawings.
6658f For more information www.linear .com/L T6658 LINEAR TECHNOLOGY CORPORATION 2016 LT 0816 • PRINTED IN USA Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com/L T6658 relaTeD parTs Typical applicaTion PART NUMBER DESCRIPTION COMMENTS LT1460 Micropower Series References 20mA Output Drive, 0.075% Accuracy, 10ppm/°C Drift LT1461 Precision Low Dropout Series References 50mA Output Drive, 0.04% Accuracy, 3ppm/°C Drift, 50µA Supply Current, 300mV Dropout LT6654 All Purpose, Rugged and Precise Series References ±10mA Output Drive, 0.05% Accuracy, 10ppm/°C Drift, 100mV Dropout, 1.6ppmP-P Noise (0.1Hz to 10Hz), –55°C to 125°C LTC6655 Precision Low Noise Series References ±5mA Output Drive, 0.025% Accuracy, 2ppm/°C Max, 0.25ppmP-P Noise (0.1Hz to 10Hz), –40°C to 125°C LT6660 T iny Micropower Series References 20mA Output Drive, 0.2% Accuracy, 20ppm/°C Drift, 2mm × 2mm DFN Package LT1761 Low Noise Low Dropout Linear Regulator 100mA Output Drive, 300mV Dropout, V IN = 1.8V to 20V, 20µVRMS Noise (10Hz to 100kHz), ThinSOT™ package LT3042 Ultralow Noise, Ultrahigh PSRR Linear Regulator 200mA Output Drive, 350mV Dropout, VIN = 1.8V to 20V 0.8µVRMS Noise (10Hz to 100kHz), 79dB PSRR (1MHz) LT3050 Low Noise Linear Regulator with Current Limit and Diagnostic Functions 100mA Output Drive, 300mV Dropout, V IN = 2V to 45V, 30μVRMS Noise (10Hz to 100kHz), 50μA Supply Current, Adj. Output LT3060 Micropower, Low Noise, Low Dropout Linear Regulator 100mA Output Drive, 300mV Dropout, V IN =1.7V to 45V, 30μVRMS Noise (10Hz to 100kHz), 40μA Supply Current, Adj. Output LT3063 Micropower, Low Noise, Low Dropout Linear Regulator with Output Discharge 200mA Output Drive, 300mV Dropout, V IN =1.6V to 45V, 30μVRMS Noise (10Hz to 100kHz), 40μA Supply Current 1µF 10µF L TC6362 3300pF 6800pF 6800pF 47µF 35.7/uni03A9 35.7/uni03A9 21k 13.7k 10k 10k 1µF 1µF 10µF 464Ω 400Ω 1µF V IN 7.5V TO 36V V OUT1_F V IN1 BYPASS L T6658-2.5 V OUT1_S 2.5V (X7R, 1210 SIZE)
6658 TA11
V OUT2_F V IN2 BANDGAP 4.096V V OUT2_S GND 3.28V –3.28V TO OTHER ANALOG CIRCUITS NR – + S IN+ IN– VDD REF GND REF/ DGC L TC2379-18 VOCM 14 11 10 1,2,6,1753