LT6106 LINER
Document overview
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Technical content
FEATURES
APPLICATIONS
DESCRIPTION
The L T®6106 is a versatile high side current sense ampli- fi er . Design fl exibility is provided by the excellent device characteristics: 250μV maximum offset and 40nA maxi- mum input bias current. Gain for each device is set by two resistors and allows for accuracy better than 1%. The L T6106 monitors current via the voltage across an external sense resistor (shunt resistor). Internal circuitry converts input voltage to output current, allowing for a small sense signal on a high common mode voltage to be translated into a ground referenced signal. The low DC offset allows for monitoring very small sense voltages. As a result, a small valued shunt resistor can be used, which minimizes the power loss in the shunt. The wide 2.7V to 44V input voltage range, high accuracy and wide operating temperature range make the L T6106 ideal for automotive, industrial and power management applications. The very low power supply current of the L T6106 also makes it suitable for low power and battery operated applications. ■ Gain Confi gurable with T wo Resistors ■ Low Offset Voltage: 250μV Maximum ■ Output Current: 1mA Maximum ■ Supply Range: 2.7V to 36V , 44V Absolute Maximum ■ Low Input Bias Current: 40nA Maximum ■ PSRR: 106dB Minimum ■ Low Supply Current: 65μA Typical, V+ = 12V ■ Operating Temperature Range: –40°C to 125°C ■ Low Profi le (1mm) ThinSOTTM Package ■ Current Shunt Measurement ■ Battery Monitoring ■ Power Management ■ Motor Control ■ Lamp Monitoring ■ Overcurrent and Fault Detection L T6106 VOUT 200mV/A
6106 TA01a
100Ω 3V TO 36V LOAD 0.02Ω V+V– OUT –IN+IN 3V to 36V , 5A Current Sense with AV = 10 , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Measurement Accuracy vs Load Current LOAD CURRENT (A) –1.2 ACCURACY (% OF FULL SCALE) –1.0 –0.6 –0.4 –0.2 2 4 5 0.6
6106 TA01b
–0.8 0.2 0.4 LIMIT OVER TEMPERATURE LIMIT OVER TEMPERATURE TYPICAL PART AT TA = 25°C 5A FULL SCALE RSENSE = 0.02Ω AV = 10 RIN = 100Ω ROUT = 1k V+ = 3V
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS Operating Temperature Range (Note 4) Specifi ed Temperature Range (Note 4) (Note 1) OUT 1 V– 2 TOP VIEW S5 PACKAGE 5-LEAD PLASTIC TSOT-23 –IN 3 5 V+ 4 +IN TJMAX = 150°C, θJA = 250°C/W ORDER INFORMATION
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V+ Supply Voltage Range ● 2.7 36 V VOS Input Offset Voltage VSENSE = 5mV 150 250 350 μV μV ΔVOS/ΔT Input Offset Voltage Drift V SENSE = 5mV ● 1μ V/°C IB Input Bias Current (+IN) V + = 12V , 36V nA nA I OS Input Offset Current V+ = 12V , 36V 1 nA IOUT Maximum Output Current (Note 2) ● 1m A PSRR Power Supply Rejection Ratio V + = 2.7V to 36V , VSENSE = 5mV ● 106 dB VSENSE(MAX) Input Sense Voltage Full Scale R IN = 500Ω (Notes 2, 7) ● 0.5 V AV Error Gain Error (Note 3) VSENSE = 500mV , RIN = 500Ω, ROUT = 10k, V+ = 12.5V ● –0.65 –0.25 0 % VSENSE = 500mV , RIN = 500Ω, ROUT = 10k, V+ = 36V ● –0.45 –0.14 0.1 % VOUT(HIGH) Output Swing High (Referred to V VSENSE = 120mV 1.2 1.4 V V The ● denotes the specifi cations which apply over the full specifi ed operating temperature range, otherwise specifi cations are at TA = 25°C. V+ = 12V , V+ = VSENSE+, RIN = 100Ω, ROUT = 10k, Gain = 100 unless otherwise noted. (Note 6) Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE L T6106CS5#TRMPBF L T6106CS5#TRPBF L TCWK 5-Lead Plastic TSOT-23 0°C to 70°C L T6106HS5#TRMPBF L T6106HS5#TRPBF L TCWK 5-Lead Plastic TSOT-23 –40°C to 125°C TRM = 500 pieces. *Temperature grades are identifi ed by a label on the shipping container . Consult L TC Marketing for parts specifi ed with wider operating temperature ranges. Consult L TC Marketing for information on lead based fi nish parts. For more information on lead free part marking, go to: http://www.linear .com/leadfree/ For more information on tape and reel specifi cations, go to: http://www.linear .com/tapeandreel/
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. In addition to the Absolute Maximum Ratings, the output current of the L T6106 must be limited to insure that the power dissipation in the L T6106 does not allow the die temperature to exceed 150°C. See the applications information section “Power Dissipation Considerations” for further information. Note 2: Guaranteed by the gain error test. Note 3: Gain error refers to the contribution of the L T6106 internal circuitry and does not include errors in the external gain setting resistors. Note 4: The L T6106C is guaranteed functional over the operating temperature range of –40°C to 85°C. The L T6106C is designed, ELECTRICAL CHARACTERISTICS The ● denotes the specifi cations which apply over the full specifi ed operating temperature range, otherwise specifi cations are at TA = 25°C. V+ = 12V , V+ = VSENSE+, RIN = 100Ω, ROUT = 10k, Gain = 100 unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Output Voltage (Note 5) VSENSE = 0mV , RIN = 100Ω, ROUT = 10k 12 45 mV mV VSENSE = 0mV , RIN = 500Ω, ROUT = 10k, V+ = 12V , 36V 71 6 mV mV BW Signal Bandwidth (–3dB) I OUT = 1mA, RIN = 100Ω, ROUT = 5k 200 kHz tr Input Step Response (to 50% of Output Step) ΔVSENSE = 100mV Step, RIN = 100Ω, ROUT = 5k, Rising Edge 3.5 μs IS Supply Current V + = 2.7V , IOUT = 0μA, (VSENSE = –5mV) 60 85 115 μA V+ = 12V , IOUT = 0μA, (VSENSE = –5mV) 65 95 120 μA V+ = 36V , IOUT = 0μA, (VSENSE = –5mV) 70 100 130 μA characterized and expected to meet specifi ed performance from –40°C to 85°C but is not tested or QA sampled at these temperatures. The L T6106H is guaranteed to meet specifi ed performance from –40°C to 125°C. Note 5: The L T6106 output is an open collector current source. The minimum output voltage scales directly with the ratio R OUT/10k. Note 6: VSENSE+ is the voltage at the high side of the sense resistor , RSENSE. See Figure 1. Note 7: VSENSE (MAX) is the maximum sense voltage for which the Electrical Characteristics will apply. Higher voltages can affect performance but will not damage the part provided that the output current of the L T6106 does not exceed the allowable power dissipation as described in Note 1. TYPICAL PERFORMANCE CHARACTERISTICS Input Offset Voltage vs Temperature TEMPERATURE (°C) –55 INPUT OFFSET VOL TAGE (μV) 200 125
6106 G03
–200 –400 –25 5 35 65 95 400 –100 100 –300 300 VSENSE = 5mV V+ = 12V RIN = 100Ω ROUT = 10k AV = 100 TYPICAL UNITS INPUT OFFSET VOL TAGE (μV) –200 PERCENT OF UNITS (%) 120
6106 G23
–120 –40 0 40 200 V+ = 12V VSENSE = 5mV RIN = 100Ω ROUT = 10k
1068 UNITS
SUPPL Y VOL TAGE (V) CHANGE IN INPUT OFFSET VOL TAGE (μV)
6106 G02
–10 –70 10 20 305 15 25 35 –30 –20 –40 –50 –60 VSENSE = 5mV RIN = 100Ω ROUT = 10k TYPICAL UNITS Input Offset Voltage vs Supply Voltage
TYPICAL PERFORMANCE CHARACTERISTICS Gain vs Frequency Step Response 0mV to 10mV (RIN = 100Ω) Step Response 10mV to 20mV (RIN = 100Ω) Gain vs Frequency Input Bias Current vs Supply Voltage Power Supply Rejection Ratio vs Frequency TEMPERATURE (°C) –45 GAIN ERROR (%) –0.30 –0.20 –0.10
6106 G04
–0.40 –0.50 –0.35 –0.25 –0.15 –0.05 –0.45 –0.55 –0.60 –25 –5 15 55 75 95 115 130 VOUT = 1V IOUT = 1mA ROUT = 1k TYPICAL UNIT V+ = 36V V+ = 12V V+ = 5V V+ = 2.7V SUPPL Y VOL TAGE (V) INPUT BIAS CURRENT (nA)
6106 G05
TA = –40°C TA = 25°C TA = 70°C TA = 125°C VSENSE = 5mV RIN = 100Ω FREQUENCY (Hz) POWER SUPPL Y REJECTION RATIO (dB) 100 100 10k 100k 1M
6106 G06
VOUT = 2.5V VOUT = 5V VOUT = 10V V+ = 12.5V AV = 20 RIN = 500Ω ROUT = 10k Power Supply Rejection Ratio vs Frequency FREQUENCY (Hz) POWER SUPPL Y REJECTION RATIO (dB) 100 100 10k 100k 1M
6106 G08
VOUT = 0.5V VOUT = 1V VOUT = 2V V+ = 12.5V AV = 20 RIN = 100Ω ROUT = 2k FREQUENCY (Hz) GAIN (dB) 1k 100k 1M 10M
6106 G09
–30 –25 –20 –15 –10 10k V+ = 12.5V AV = 100 RIN = 100Ω ROUT = 10k VOUT = 10V VOUT = 2.5V VSENSE 20mV/DIV VOUT 500mV/DIV 5μs/DIVAV = 100 VOUT = 0V TO 1V ROUT = 10k V+ = 12V 6106 G1 VSENSE 20mV/DIV VOUT 500mV/DIV 5μs/DIVAV = 100 VOUT = 1V TO 2V ROUT = 10k V+ = 12V 6106 G1 FREQUENCY (Hz) GAIN (dB) 1k 100k 1M 10M
6106 G14
–30 –25 –20 –15 –10 10k V+ = 12.5V AV = 20 RIN = 500Ω ROUT = 10k VOUT = 10V VOUT = 2.5V Gain Error vs Temperature Gain Error Distribution GAIN ERROR (%) –0.60 PERCENT OF UNITS (%) –0.48 –0.36 –0.24 –0.12
6106 G24
V+ = 12.5V VSENSE = 500mV RIN = 500Ω ROUT = 10k 11,072 UNITS T A = 25°C
Step Response 0mV to 100mV (RIN = 100Ω) TYPICAL PERFORMANCE CHARACTERISTICS Step Response 0mV to 50mV IN = 500Ω) Step Response 50mV to 500mV (RIN = 500Ω) Output Voltage vs Input Sense Voltage (0mV ≤ VSENSE ≤ 10mV) Step Response 10mV to 100mV (RIN = 100Ω) Step Response 50mV to 100mV (RIN = 500Ω) TEMPERATURE (°C) –50 OUTPUT VOL TAGE (V) 11.00 11.05 11.10 25 75
6106 G07
10.95 10.90 –25 0 50 100 125 10.85 10.80 V+ = 12V AV = 100 RIN = 100Ω ROUT = 10k VSENSE = 120mV VSENSE 200mV/DIV VOUT 2V/DIV 5μs/DIVAV = 100 VOUT = 0V TO 10V ROUT = 10k V+ = 12V 6106 G1 VSENSE 200mV/DIV VOUT 2V/DIV 5μs/DIVAV = 100 VOUT = 1V TO 10V ROUT = 10k V+ = 12V 6106 G1 VSENSE 100mV/DIV VOUT 500mV/DIV 5μs/DIVAV = 20 VOUT = 1V TO 2V ROUT = 10k V+ = 12V
6106 G15
5μs/DIVAV = 20 VOUT = 0V TO 1V ROUT = 10k V+ = 12V
6106 G16
5μs/DIVAV = 20 VOUT = 1V TO 10V ROUT = 10k V+ = 12V
6106 G17
Step Response 0mV to 500mV (RIN = 500Ω) VSENSE 1V/DIV VOUT 2V/DIV 5μs/DIVAV = 20 VOUT = 0V TO 10V ROUT = 10k V+ = 12V
6106 G18
VSENSE (mV) VOUT (mV)600 800 1100 1000
6106 G19
V+ = 12V AV = 100 RIN = 100Ω ROUT = 10k Output Voltage vs Input Sense Voltage (0mV ≤ VSENSE ≤ 10mV) VSENSE (mV) VOUT (mV)120 160 220 200
6106 G20
V+ = 12V AV = 20 RIN = 500Ω ROUT = 10k
V– (Pin 2): Normally Connected to Ground. is the voltage developed across RSENSE. sense resistor , either directly or through a resistor . nected directly to either side of the sense resistor , RSENSE. the more negative side of the sense resistor .
6106 F01
Figure 1. L T6106 Block Diagram and Typical Connection
6106 G21
6106 G22
6106 G01
and may be used as is, or processed with an output fi lter . corresponding current, VSENSE/RIN, will fl ow through RIN. PNP to the output pin as IOUT. Table 1. Useful Gain Confi gurations may require that the maximum sense voltage be 100mV . SENSE should be no more than 50mΩ. 10mV at 2A, dissipating only 20mW . input maximum of 0.5V is allowed. in measurement due to their relatively large resistances.
bursts of high currents can be ignored. rent is converted to voltage. VOUT is simply IOUT • ROUT. maximum input range of this circuit.
- () IIR IROUT OUT OUT OUT•• . • • 100 101 09 9= Error Sources The current sense system uses an amplifi er and resistors to apply gain and level shift the result. The output is then dependent on the characteristics of the amplifi er , such as gain and input offset, as well as resistor matching. Ideally, the circuit output is: VV R R VR IOUT SENSE OUT IN SENSE SENSE SENSE== •; • In this case, the only error is due to resistor mismatch, which provides an error in gain only. However , offset volt- age and bias current cause additional errors.
Figure 3. Shunt Diode Limits Maximum Input Voltage to Allow Figure 2. Kelvin Input Connection Preserves Accuracy with
6106 F02
6106 F03
internal op amp. IB– fl ows into the negative input. the 60μV error above is reduced to 6μV . Figure 4. Second Input R Minimizes Error Due to Input Bias Current
6106 F04
above the ambient temperature. ditions exist, external clamps. ditional constraint can be stated as V + – (+IN) ≤ 500mV . the recommended operating range. Figure 5. L T6106 Supply Current Monitored with the Load
6106 F05
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. through a resistor or Schottky diode (Figure 7). changing while internal nodes are being charged. Figure 6. Schottky Diode Prevents Damage During Supply Reversal Figure 7. Additional Resistor R3 Protects Output
5 PLCS (NOTE 3)DATUM ‘A’
2.90 BSC
0.95 BSC
1.90 BSC
1.00 MAX
- DIMENSIONS ARE IN MILLIMETERS
- DIMENSIONS ARE INCLUSIVE OF PLATING
- DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
- MOLD FLASH SHALL NOT EXCEED 0.254mm
- JEDEC PACKAGE REFERENCE IS MO-193
3.85 MAX
1.22 REF
6106 F06
6106 F07
Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com © LINEAR TECHNOLOGY CORPORATION 2007 LT 0807 REV A • PRINTED IN USA RELATED PARTS PART NUMBER DESCRIPTION COMMENTS L T1787 Precision Bidirectional, High Side Current Sense Amplifi er 75μV V OS, 60V , 60μA Operation L T6100 Gain-Selectable High Side Current Sense Amplifi er 4.1V to 48V , Pin-Selectable Gain: 10, 12.5, 20, 25, 40, 50V/V LT C ®6101/L TC6101HV High Voltage, High Side, Precision Current Sense Amplifi ers 4V to 60V/5V to 100V , Gain Confi gurable, SOT-23 L TC6103 Dual High Side, Precision Current Sense Amplifi er 4V to 60V , Gain Confi gurable 8-Pin MSOP L TC6104 Bidirectional High Side, Precision Current Sense Amplifi er 4V to 60V , Gain Confi gurable 8-Pin MSOP TYPICAL APPLICATION Simple 400V Current Monitor
6106 TA02
100Ω VOUT ROUT 4.99k L O A D VOUT = • VSENSE = 49.9 VSENSE ROUT RIN M1 AND M2 ARE FQD3P50 12V CMPZ12L 400V BAT46 VSENSE RSENSE ISENSE DANGER! Lethal Potentials Present — Use Caution DANGER!! HIGH VOL TAGE!! V+V– OUT –IN+IN