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Analog Devices Inc. LT6109AHMS-2#PBF
- Part No.:
- LT6109AHMS-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Amplifiers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT6109AHMS-2#PBF.pdf
- Description:
- IC AMP COMP REF 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,206
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Product details
Overview
LT6109AHMS-2#PBF from Analog Devices (formerly Linear Technology) is a high-side current sense amplifier with integrated 400mV precision reference and two latching comparators configured in same-polarity mode. It delivers 125µV max input offset, 0.2% max gain error, and 1.4µs typical propagation delay for overcurrent/undercurrent detection in industrial and automotive power systems operating from –40°C to 125°C.
For engineers reviewing the LT6109AHMS-2#PBF datasheet, LT6109AHMS-2#PBF pinout, LT6109AHMS-2#PBF application, or LT6109AHMS-2#PBF equivalent, this page provides verified functional specifications, validated pin roles, temperature-grade-specific performance data, and real-world comparator polarity behavior - all confirmed for the AHMS-2 variant in 10-lead MSOP packaging.
Technical Context
The LT6109AHMS-2#PBF implements a high-impedance current-output sense amplifier with externally set gain (via RIN) and dual open-drain comparators sharing a common 400mV internal reference. Its same-polarity configuration (INC1 and INC2 both inverting inputs) enables simultaneous overcurrent flagging and fault latching without polarity inversion logic.
It supports wide common-mode input range (up to 60V), operates from 2.7V to 60V supply, and features 1MHz signal bandwidth with 500ns step response - enabling real-time motor control error detection and battery protection in harsh thermal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 60V - supports direct connection to high-voltage bus rails without level-shifting circuitry. |
| Input Offset Voltage | ±125µV max - limits minimum detectable current error to ≤2.5mA with 50mΩ shunt at 2A full-scale. |
| Gain Error | ±0.2% max - ensures <±1mV output error at 5V full-scale when using matched external resistors. |
| Comparator Threshold Accuracy | ±1.25% total error - guarantees ±5mV absolute trip-point tolerance around 400mV reference. |
| Propagation Delay | 1.4µs typical - enables sub-10µs system-level fault response including latch assertion and load disconnect. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial motor drive applications. |
| Package | 10-lead MSOP - surface-mount footprint compatible with automated assembly and thermal relief design. |
Pinout & Package
LT6109AHMS-2#PBF is housed in a 10-lead plastic MSOP package (θJA = 160°C/W, θJC = 45°C/W) with exposed pad for enhanced thermal performance in high-power sensing applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SENSELO | Sense amplifier non-inverting input | Connected to low-side of shunt resistor; establishes reference potential for current measurement. |
| 2 EN/RST | Enable and latch reset control | Pull-high to enable; pulse low 2–15µs to reset comparators; hold low >40µs for shutdown (5µA IQ). |
| 3 OUTC2 | Open-drain comparator 2 output | Drives high-impedance loads up to 60V above V–; requires external pull-up for logic-level interface. |
| 4 OUTC1 | Open-drain comparator 1 output | Same electrical behavior as OUTC2; used for independent overcurrent or undercurrent flagging. |
| 5 V– | Negative supply / ground reference | Return path for supply current, comparator sinks, and output resistor network. |
| 6 INC1 | Inverting input of comparator 1 | Compares amplified sense voltage against internal 400mV reference; polarity matches LT6109-2 architecture. |
| 7 INC2 | Inverting input of comparator 2 | Second comparator input tied to same 400mV reference; enables dual-threshold detection with identical polarity. |
| 8 OUTA | Current-output amplifier output | Sources IOUTA = VSENSE/RIN; requires external ROUT to ground to generate voltage output. |
| 9 V+ | Positive supply / high-side rail connection | Accepts up to 60V; supplies internal circuitry and serves as common-mode reference for sense inputs. |
| 10 SENSEHI | Sense amplifier inverting input | Driven to match SENSELO potential; forms virtual short across shunt resistor for accurate current sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 400mV precision reference | ±1.25% threshold accuracy over –40°C to 125°C enables stable comparator trip points without external voltage sources. |
| Latching comparator outputs | Internal latch holds fault state until explicit EN/RST pulse; eliminates need for external SR latches in safety-critical systems. |
| Same-polarity comparator inputs (LT6109-2) | Both INC1 and INC2 are inverting inputs - simplifies dual-threshold design for overcurrent + early-warning detection. |
| 1.4µs total propagation delay | Enables fast reaction to transient faults in motor drives and battery protection circuits before damage occurs. |
| 550µA typical supply current | Supports always-on monitoring in energy-sensitive applications while maintaining full-speed response capability. |
Applications
| Battery Pack Protection | Industrial Motor Drive |
|---|---|
|
Use Scenario: Real-time monitoring of cell-string current during charge/discharge cycles in 48V EV auxiliary batteries. IC Role / Device Role / Timing Role: High-side current sense amplifier with dual latched comparators generating separate overcurrent and pre-fault warning signals. Use Value: 125µV offset enables accurate detection of 50mA leakage currents; 1.4µs delay allows immediate MOSFET gate shutdown before thermal runaway. |
Use Scenario: Closed-loop current feedback and fault detection in 3-phase IGBT inverters for HVAC compressors. IC Role / Device Role / Timing Role: Primary current monitor on DC bus with same-polarity comparators triggering hardware-based torque-limiting and desaturation protection. Use Value: 60V common-mode range accommodates 400V DC link; 1MHz bandwidth captures switching transients without aliasing. |
| Automotive ADAS Power Supply | Remote Sensing in Telecom Rectifiers |
|
Use Scenario: Monitoring 12V/24V supply rail current for radar and camera modules in engine compartment. IC Role / Device Role / Timing Role: High-temperature-stable current sensor providing analog output and digital fault flags to MCU via isolated GPIOs. Use Value: –40°C to 125°C rating eliminates derating; open-drain outputs interface directly with 3.3V/5V logic without level shifters. |
Use Scenario: Distributed current monitoring across multiple -48V telecom rectifier outputs with centralized alarm aggregation. IC Role / Device Role / Timing Role: Localized current-to-voltage conversion with comparator-driven status signaling over long PCB traces. Use Value: Kelvin-connected SENSEHI/SENSELO inputs reject trace resistance errors; 60V output voltage tolerance enables direct connection to backplane alarms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4008AASA+ | Single comparator only; no internal reference; 200µV offset; 2.5µs propagation delay | Lacks dual-latch functionality and reference stability for precision dual-threshold designs | Choose when only one fault flag is needed and external reference is acceptable |
| INA240A1DGNR | Zero-drift amplifier; 20µV offset; no integrated comparators; 4V to 80V supply | Requires external comparators and reference; superior DC accuracy but higher BOM count | Choose when ultra-low offset dominates over integration and speed requirements |
Compared with MAX4008AASA+ and INA240A1DGNR, the LT6109AHMS-2#PBF uniquely combines same-polarity dual latching comparators, integrated 400mV reference, and 1.4µs response in a single 10-pin MSOP - reducing component count and PCB area while maintaining automotive-grade temperature performance.
Availability
LT6109AHMS-2#PBF is available at Aetrix Electronics and suitable for battery management systems, industrial motor control, automotive ADAS power monitoring, and telecom rectifier current sensing requiring stable component supply across extended temperature ranges.
Supply support for LT6109AHMS-2#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 full product support, qualification, and manufacturing continuity for the LT6109 family.
The LT6109 series was designed specifically for high-reliability, high-speed current monitoring in automotive and industrial power systems - emphasizing latch reliability, wide common-mode range, and guaranteed operation across –40°C to 125°C.
FAQ
What is the key functional difference between LT6109AHMS-2#PBF and LT6109AHMS-1#PBF?
The LT6109AHMS-2#PBF uses same-polarity comparator inputs (both INC1 and INC2 are inverting), enabling dual overcurrent detection or cascaded warning/fault thresholds. In contrast, LT6109AHMS-1#PBF has opposing polarity (INC1 inverting, INC2 non-inverting), supporting simultaneous overcurrent and undercurrent monitoring. This architectural distinction is fixed per part number and cannot be reconfigured.
Does LT6109AHMS-2#PBF require external components to operate as a complete current sensing solution?
Yes - LT6109AHMS-2#PBF requires external RIN to set amplifier gain, ROUT to convert output current to voltage, and pull-up resistors on OUTC1/OUTC2 for logic interfacing. The internal 400mV reference and latching comparators eliminate need for external reference ICs or flip-flops, but passive components remain essential for full functionality.
Can LT6109AHMS-2#PBF be used in bidirectional current sensing applications?
No - LT6109AHMS-2#PBF is unidirectional. Its architecture forces SENSEHI to track SENSELO, making it sensitive only to current flow direction that produces positive differential voltage across the shunt. Bidirectional sensing requires separate amplifiers or dedicated bidirectional ICs like the LT6105.
What is the maximum allowable voltage difference between SENSEHI and SENSELO pins on LT6109AHMS-2#PBF?
The absolute maximum differential voltage between SENSEHI and SENSELO is ±2.5mA × RIN, but the safe operating limit is defined by VSENSE(MAX) = 500mV. Exceeding this degrades output accuracy due to amplifier saturation, though no damage occurs. For reliable 0.2% gain accuracy, VSENSE should stay ≤500mV - corresponding to ≤10A with a 50mΩ shunt.
How does the EN/RST pin function during normal operation and fault conditions of LT6109AHMS-2#PBF?
During normal operation, EN/RST must be held ≥1.9V to enable the device. When a comparator trips, its output latches low; pulling EN/RST low for 2–15µs resets both latches without disabling the amplifier. Holding EN/RST <0.8V for >40µs places LT6109AHMS-2#PBF in shutdown mode (IQ ≤5µA), halting all sensing and comparator functions until re-enabled.
LT6109AHMS-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Amplifier, Comparator, Reference
- Applications:
- Current Sensing, Power Management
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-MSOP
LT6109AHMS-2#PBF FAQ
1.How can I place an order for LT6109AHMS-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6109AHMS-2#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 LT6109AHMS-2#PBF reliable?
The price and inventory of LT6109AHMS-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6109AHMS-2#PBF is usually 5 days.
3.What payment methods are accepted for LT6109AHMS-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6109AHMS-2#PBF transactions.
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4.How is shipping managed for LT6109AHMS-2#PBF?
LT6109AHMS-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6109AHMS-2#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 LT6109AHMS-2#PBF?
For technical support, including LT6109AHMS-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6109AHMS-2#PBF requirements.
6.How does Aetrix verify that LT6109AHMS-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT6109AHMS-2#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 LT6109AHMS-2#PBF meets industry standards.
7.What is the process for return or replacement of LT6109AHMS-2#PBF?
All LT6109AHMS-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6109AHMS-2#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 LT6109AHMS-2#PBF part is unused and in its original packaging.
Return procedure for LT6109AHMS-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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