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Analog Devices Inc. LT6105HMS8#PBF
- Part No.:
- LT6105HMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT6105HMS8#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,974
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Product details
Overview
LT6105HMS8#PBF from Analog Devices (acquired Linear Technology) is a precision, micropower current sense amplifier with unidirectional sensing capability, –0.3V to 44V input common mode range relative to V–, 1% max gain error, <0.8mV input offset voltage (–40°C to 125°C), and 2V/μs slew rate. It operates from 2.85V to 36V supply and draws only 300μA typical quiescent current, enabling high-side or low-side battery, fuse, and MOSFET current monitoring in automotive power management systems.
For engineers reviewing the LT6105HMS8#PBF datasheet, LT6105HMS8#PBF pinout, LT6105HMS8#PBF application, or LT6105HMS8#PBF equivalent, key selection criteria include extended common-mode operation down to –0.3V below V–, ±44V differential input tolerance, MS8 package thermal performance (θJA = 250°C/W), and guaranteed –40°C to 125°C operation for under-hood automotive use.
Technical Context
The LT6105HMS8#PBF employs dual-amplifier topology with automatic input-range switching: at V(–IN) > 1.6V, it routes sense current through RIN2 and Q1; at V(–IN) < 1.6V, it uses RIN1 and Q2/Q3 mirroring. This architecture enables seamless operation across its full –0.3V to 44V common-mode range without external level-shifting circuitry.
Its input stage withstands ±44V differential voltage and –9.5V reverse input (referred to V–), making it suitable for direct fuse or MOSFET switch monitoring. The output drives up to 1mA into ROUT while maintaining ≤1% gain error, with VO(MIN) = 45mV and VO(MAX) = 1.7V (referred to V+) at 120mV input and AV = 100.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Common Mode Range | –0.3V to 44V relative to V–: supports high-side, low-side, and negative-supply current sensing without external biasing |
| Gain Accuracy | ±1% max over –40°C to 125°C: ensures stable current measurement accuracy across automotive temperature extremes |
| Input Offset Voltage | ±0.8mV max (–40°C to 125°C): enables accurate detection of sub-10mA currents with typical 5mΩ sense resistors |
| Supply Current | 300μA typical at 2.85V: allows continuous battery monitoring in always-on systems with minimal drain |
| Slew Rate | 2V/μs: provides fast response to overcurrent events such as short-circuit transients in motor drivers |
| Differential Input Rating | ±44V: permits direct connection across fuses or MOSFETs without external protection components |
| Operating Temperature | –40°C to 125°C: qualified for engine compartment and industrial control applications |
Pinout & Package
LT6105HMS8#PBF is housed in an 8-lead plastic MSOP package (3mm × 3mm, 0.65mm pitch) with exposed pad connected to V–. Thermal resistance θJA = 250°C/W supports operation in compact, thermally constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (–IN) | Negative Sense Input | Accepts voltages from –0.3V to 44V relative to V–; connects to RIN1 for low-voltage operation (<1.6V) |
| 2 (V+) | Positive Supply | 2.85V–36V independent bias rail; powers internal amplifiers and output stage |
| 3 (NC) | No Connect | Internally unused; must be left floating or grounded per layout best practices |
| 4 (V–) | Negative Supply / Ground | Reference node for all inputs and outputs; exposed pad internally tied to this pin |
| 5 (VOUT) | Voltage Output | Amplified, level-shifted representation of VSENSE; drives 1mA max into ROUT |
| 6 (NC) | No Connect | Internally unused; no electrical function |
| 7 (NC) | No Connect | Internally unused; no electrical function |
| 8 (+IN) | Positive Sense Input | Accepts voltages from –0.3V to 44V relative to V–; connects to RIN2 for high-voltage operation (>1.6V) |
Key Features
| Feature | Design Value |
|---|---|
| Over-the-Top® Input Range | Operates with inputs up to 44V above V– and down to –0.3V below V–, eliminating need for external level shifters in high-side sensing |
| Power-Down Input Isolation | Sense pins draw ≤2.5μA when V+ = 0V, preventing loading of monitored circuit during standby |
| Configurable Gain (1–100V/V) | Set via external RIN1/RIN2/ROUT; RIN1 = RIN2 recommended for optimal accuracy across full input range |
| High CMRR & PSRR | ≥95dB CMRR and ≥94dB PSRR ensure stable output despite supply ripple or common-mode noise on VS+/VS– lines |
| Robust Input Protection | Withstands ±44V differential input and –9.5V reverse input (referred to V–), enabling direct fuse monitoring without clamping diodes |
Applications
| Automotive Battery Monitoring | Fuse and Circuit Breaker Health |
|---|---|
Use Scenario: Continuous monitoring of 12V/24V lead-acid or Li-ion battery current during charge/discharge cycles in start-stop systems. IC Role / Device Role / Timing Role: Unidirectional current sense amplifier providing level-shifted analog output proportional to battery current. Use Value: Enables precise state-of-charge estimation and overcurrent protection with ±0.8mV offset error limiting measurement uncertainty to ±16mA using 50mΩ sense resistor. | Use Scenario: Real-time current monitoring across automotive blade fuses or solid-state circuit breakers to detect degradation or impending failure. IC Role / Device Role / Timing Role: High-common-mode differential monitor placed directly across fuse terminals. Use Value: ±44V differential rating allows direct connection without isolation; 2V/μs slew rate captures fast fuse blow transients for predictive maintenance. |
| Industrial Power Supply OCP | MOSFET Switch Monitoring |
Use Scenario: Overcurrent protection in programmable DC power supplies delivering up to 44V output with tight current regulation. IC Role / Device Role / Timing Role: Precision current sense amplifier feeding feedback loop of current-mode controller. Use Value: 1% gain error and 95dB CMRR maintain regulation accuracy despite ground bounce or supply ripple in high-noise environments. | Use Scenario: Bidirectional current monitoring of N-channel MOSFETs in half-bridge motor drivers operating from –12V to +44V rails. IC Role / Device Role / Timing Role: High-side current sensor interfacing between MOSFET source/drain and gate driver logic. Use Value: –0.3V to 44V common-mode range accommodates MOSFET VDS swing including shoot-through conditions; NC pins simplify routing in dense gate-driver layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX40056ASA+T | Wider supply range (2.7V–60V), lower offset (±50μV), but only –0.1V to 65V common mode and no power-down isolation | Superior for ultra-low-offset precision lab equipment; unsuitable for negative-rail monitoring due to –0.1V lower limit | Select MAX40056ASA+T when sub-50μV offset is critical and input never drops below –0.1V relative to V– |
| INA240A1QDRQ1 | Automotive AEC-Q100 qualified, 80V common mode, but higher offset (±100μV) and 2.7mA supply current | Better for 48V mild-hybrid systems requiring 80V rating; less suitable for battery-constrained always-on monitoring | Select INA240A1QDRQ1 when 80V common-mode headroom or AEC-Q100 qualification is mandatory |
Compared with MAX40056ASA+T and INA240A1QDRQ1, the LT6105HMS8#PBF uniquely combines –0.3V input capability, 300μA quiescent current, and robust ±44V differential tolerance-making it optimal for cost-sensitive, thermally constrained automotive and industrial current monitoring where negative-rail operation and ultra-low power are essential.
Availability
LT6105HMS8#PBF is available at Aetrix Electronics and suitable for automotive battery management, industrial overcurrent protection, and portable test equipment requiring stable component supply across extended temperature ranges.
Supply support for LT6105HMS8#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its precision analog portfolio, emphasizing high-performance signal conditioning, power management, and interface ICs for demanding industrial and automotive applications.
The LT6105HMS8#PBF belongs to Linear's Over-the-Top® current sense amplifier family, designed specifically for high-accuracy, wide common-mode current monitoring in harsh environments where traditional amplifiers require complex external circuitry.
FAQ
What is the guaranteed operating temperature range for LT6105HMS8#PBF?
The LT6105HMS8#PBF is fully specified and guaranteed over –40°C to 125°C ambient temperature, with electrical characteristics validated across this range per Linear Technology datasheet revision 6105fa. This makes LT6105HMS8#PBF suitable for under-hood automotive applications and industrial control systems exposed to extreme thermal stress.
Can LT6105HMS8#PBF monitor current on a negative supply rail?
Yes, LT6105HMS8#PBF can monitor current on negative supply rails because its input common mode range extends to –0.3V relative to V–. When V– is tied to a negative potential (e.g., –12V), the –0.3V lower limit allows sensing down to –12.3V, enabling direct current measurement in dual-supply and bipolar systems without level-shifting circuitry.
What is the maximum differential input voltage the LT6105HMS8#PBF can withstand?
The LT6105HMS8#PBF can withstand a differential input voltage of ±44V between +IN and –IN pins, as specified in Absolute Maximum Ratings. This rating allows LT6105HMS8#PBF to be used directly across fuses, MOSFETs, or other high-voltage switching elements without external protection components in most automotive and industrial applications.
How does the LT6105HMS8#PBF behave when its V+ supply is powered down?
When V+ is powered down, the LT6105HMS8#PBF biases its sense pins off, reducing total input current to ≤2.5μA. This prevents loading of the monitored circuit regardless of the voltage present on VS+ or VS–, preserving system integrity during sleep or fault states-a critical feature for always-connected battery monitoring applications using LT6105HMS8#PBF.
What external resistors are required to configure gain on the LT6105HMS8#PBF?
The LT6105HMS8#PBF requires three external resistors: RIN1 (connected to –IN), RIN2 (connected to +IN), and ROUT (connected to VOUT). Gain is set as AV = ROUT/RIN1 for V(–IN) < 1.6V or AV = ROUT/RIN2 for V(–IN) > 1.6V. For best accuracy across the full input range, RIN1 and RIN2 should be matched (e.g., both 100Ω), as specified in the LT6105HMS8#PBF datasheet.
LT6105HMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 100 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 300µA
- Current - Output / Channel:
- 1 mA
- Voltage - Supply Span (Min):
- 2.85 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT6105HMS8#PBF FAQ
1.How can I place an order for LT6105HMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6105HMS8#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT6105HMS8#PBF reliable?
The price and inventory of LT6105HMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6105HMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT6105HMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6105HMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6105HMS8#PBF?
LT6105HMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6105HMS8#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT6105HMS8#PBF?
For technical support, including LT6105HMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6105HMS8#PBF requirements.
6.How does Aetrix verify that LT6105HMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT6105HMS8#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT6105HMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT6105HMS8#PBF?
All LT6105HMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6105HMS8#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT6105HMS8#PBF part is unused and in its original packaging.
Return procedure for LT6105HMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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