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Analog Devices Inc. LT6100IDD#PBF
- Part No.:
- LT6100IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT6100IDD#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:456
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Product details
Overview
LT6100IDD#PBF from Analog Devices (formerly Linear Technology) is a precision, micropower, gain-selectable high-side current sense amplifier designed for unidirectional current monitoring via an external sense resistor. It delivers 0.5% gain accuracy across six pin-selectable gains (10–50V/V), operates with sense inputs up to 48V, features 300µV max input offset voltage, and draws only 60µA supply current - ideal for battery-powered fuse and load current monitoring in industrial and portable systems.
For engineers reviewing the LT6100IDD#PBF datasheet, LT6100IDD#PBF pinout, LT6100IDD#PBF application, or LT6100IDD#PBF equivalent, key selection considerations include its 4.1V–48V common-mode input range, reverse-battery protection to –48V, power-down input leakage <1nA, buffered output, and integrated noise filtering via FIL pin - all critical for robust high-side sensing in automotive, telecom, and embedded power management.
Technical Context
The LT6100IDD#PBF uses an Over-The-Top® input topology enabling operation with VS+ as low as 4.1V (1.4V above VCC) and up to 48V, while maintaining >105dB CMRR and PSRR. Its two-stage architecture first level-shifts and amplifies VSENSE by 10V/V (A1 stage), then applies programmable gain (A2 stage) via A2/A4 pins to achieve final gains of 10, 12.5, 20, 25, 40, or 50V/V.
It incorporates internal 5kΩ gain-setting resistors (RG1/RG2) and a dedicated FIL pin connected to a 60kΩ internal RC network, allowing single-capacitor low-pass filtering (e.g., 220pF → 12kHz rolloff). The device remains functional during VCC power-down, with sense input current dropping to ≤1nA at VS = 48V - preserving circuit integrity in always-connected battery applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy | ±0.5% over full temperature range - ensures stable current measurement without calibration drift in industrial environments. |
| Sense Input Range | 4.1V to 48V common-mode - supports direct monitoring of MOSFET switches, fuses, and 12/24/48V bus systems. |
| Input Offset Voltage | Max ±350µV (DD package) - enables accurate low-current detection down to ~7mA with 50mΩ sense resistor. |
| Supply Current | 60µA typical - allows continuous operation in energy-constrained IoT and portable devices. |
| Reverse Battery Protection | Withstands –48V on VS+/VS– - eliminates need for external protection diodes in automotive battery interfaces. |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial temperature range (I-grade). |
| Power-Down Input Leakage | ≤1nA at VCC = 0V, VS = 48V - prevents loading of monitored circuit when powered off. |
Pinout & Package
LT6100IDD#PBF is housed in an 8-lead (3mm × 3mm) plastic DFN package with exposed thermal pad (Pin 9) soldered to PCB ground for thermal performance. Pin 1 is marked by top-side dot; exposed pad is electrically connected to VEE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VS– (Pin 1) | Negative sense input | Connects to low side of RSENSE; internally tied to 5kΩ resistor RG1 - forms part of precision current-to-voltage conversion path. |
| VCC (Pin 2) | Supply input | Powers both sense amplifier and op amp; operates from 2.7V–36V - decoupled separately to minimize noise coupling into sensing path. |
| FIL (Pin 3) | Noise filter input | Connects to internal 60kΩ network; adding capacitor sets single-pole low-pass cutoff (e.g., 220pF → 12kHz) for ripple rejection. |
| VEE (Pin 4) | Negative supply / ground | Reference for output and internal circuitry; exposed pad must be soldered to PCB ground plane for thermal and electrical stability. |
| VOUT (Pin 5) | Buffered output | Provides rail-to-rail capable, low-impedance voltage proportional to sensed current - drives ADCs, comparators, or microcontrollers directly. |
| A2 (Pin 6) | Gain select | Strapping to VEE or floating selects A2 op amp gain (1×–5×); combined with A4 determines total system gain (10–50V/V). |
| A4 (Pin 7) | Gain select | Second gain control pin; logic state (VEE/floating) and combination with A2 defines final gain per Table 1 in datasheet. |
| VS+ (Pin 8) | Positive sense input | Connects to high side of RSENSE; internally tied to 5kΩ resistor RG2 - completes differential sense path with VS–. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable gain | Six precise gains (10/12.5/20/25/40/50V/V) set by strapping A2/A4 pins - eliminates external gain resistors and layout sensitivity. |
| Over-The-Top® input architecture | Enables operation with VS+ as low as 4.1V (1.4V above VCC) and up to 48V - supports wide-input-range monitoring without level-shifting ICs. |
| Reverse-battery protected inputs | Withstands –48V on VS+/VS– - removes need for external series diodes in automotive battery-sensed applications. |
| Power-down input isolation | Sense input leakage ≤1nA when VCC = 0V - maintains circuit integrity and avoids parasitic loading in always-connected battery systems. |
| Integrated noise filtering | FIL pin connects to internal 60kΩ RC network - enables simple, effective differential noise suppression with one external capacitor. |
Applications
| Battery Monitoring | Fuse Monitoring |
|---|---|
Use Scenario: Real-time monitoring of Li-ion battery pack discharge current in portable medical devices. IC Role / Device Role / Timing Role: High-side current sense amplifier converting RSENSE voltage to buffered analog output for MCU ADC sampling. Use Value: 60µA quiescent current extends battery life; 0.5% gain accuracy ensures reliable SOC estimation without periodic recalibration. | Use Scenario: Detecting open-circuit conditions in 48V telecom power distribution fuses. IC Role / Device Role / Timing Role: High-side monitor placed upstream of fuse to detect zero-current fault condition before downstream load disconnect. Use Value: Withstands 48V common-mode and –48V reverse battery - eliminates external protection components and reduces BOM count. |
| Portable Test Equipment | Industrial Power Supplies |
Use Scenario: Precision current measurement in handheld multimeters with auto-ranging capability. IC Role / Device Role / Timing Role: Programmable-gain current sensor feeding dual-slope ADC, dynamically switching gain based on measured range. Use Value: Six pin-selectable gains enable 100:1 dynamic range coverage (e.g., 10mA–1A) using single RSENSE value and no external switches. | Use Scenario: Overcurrent protection and telemetry in 24V industrial PLC power modules. IC Role / Device Role / Timing Role: High-side current monitor providing analog feedback to isolated DC-DC controller and digital fault reporting via optocoupler. Use Value: 105dB CMRR rejects switching noise from adjacent SMPS stages; FIL pin filters high-frequency ripple from rectified AC input. |
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 |
|---|---|---|---|
| INA240A1IDR | Fixed gain (20V/V), lower offset (±25µV), higher bandwidth (400kHz), but requires external VREF for bidirectional support. | Optimized for motor control with bidirectional sensing; lacks pin-selectable gain and reverse-battery protection. | Choose INA240A1IDR for high-speed, ultra-low-offset applications where fixed gain suffices and reverse-battery stress is absent. |
| MAX40056ATA+T | Fixed gain (50V/V), wider temp range (–40°C to +125°C), integrated reference, but no FIL pin or power-down isolation. | Targeted at automotive battery monitoring with AEC-Q100 qualification; lacks programmable gain and high-impedance power-down mode. | Choose MAX40056ATA+T for AEC-Q100-compliant automotive designs requiring guaranteed 125°C operation and integrated reference. |
Compared with INA240A1IDR and MAX40056ATA+T, the LT6100IDD#PBF uniquely combines pin-selectable gain, reverse-battery tolerance, and sub-nA power-down leakage - making it optimal for industrial and portable systems requiring flexible, robust, low-power high-side sensing without external protection or gain-setting components.
Availability
LT6100IDD#PBF is available at Aetrix Electronics and suitable for battery monitoring, fuse monitoring, and portable test equipment requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade (–40°C to +85°C).
Supply support for LT6100IDD#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT6100 product line was developed by Linear Technology specifically for precision, micropower, high-side current sensing in space-constrained and energy-sensitive applications - emphasizing accuracy, wide input voltage range, and robustness in harsh electrical environments.
FAQ
What is the maximum common-mode voltage the LT6100IDD#PBF can handle on its sense inputs?
The LT6100IDD#PBF supports a sense input common-mode voltage range from 4.1V to 48V. It also withstands reverse-battery conditions down to –48V on VS+/VS–, making it suitable for automotive and industrial battery-connected applications where polarity reversal may occur. This rating is absolute and does not depend on VCC voltage.
How do I configure the LT6100IDD#PBF for a gain of 25V/V?
To configure the LT6100IDD#PBF for 25V/V gain, connect Pin 6 (A2) to VEE and leave Pin 7 (A4) floating (open). This configuration corresponds to G2 = 2.5 in the internal op amp stage, resulting in total gain AV = 10 × 2.5 = 25V/V. No external resistors are required - gain is set solely by the logic state of these two pins.
Does the LT6100IDD#PBF require external components for basic operation?
Yes - the LT6100IDD#PBF requires at minimum an external sense resistor (RSENSE) between VS+ and VS–, plus decoupling capacitors on VCC and VEE. For noise filtering, a capacitor on FIL is recommended (e.g., 220pF for 12kHz rolloff). Unlike many competitors, it needs no external gain-setting resistors due to its internal precision resistor network and pin-selectable architecture.
What happens to the sense inputs of the LT6100IDD#PBF when VCC is disconnected?
When VCC is powered down, the LT6100IDD#PBF's sense inputs (VS+ and VS–) enter a high-impedance state with leakage current ≤1nA at 48V - thanks to its Over-The-Top® input topology. This prevents loading of the monitored circuit, enabling safe "always-connected" battery monitoring even during system sleep or power-off states.
Is the LT6100IDD#PBF RoHS-compliant and lead-free?
Yes - the LT6100IDD#PBF carries the #PBF suffix, indicating it is lead-free and RoHS-compliant per EU Directive 2011/65/EU. It uses matte tin (Sn) plating on its leads and conforms to JEDEC J-STD-020 moisture sensitivity level (MSL) 1 for the DFN package, supporting standard reflow profiles without special handling requirements.
LT6100IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.05V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 150 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 80 µV
- Current - Supply:
- 60µA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT6100IDD#PBF FAQ
1.How can I place an order for LT6100IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6100IDD#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 LT6100IDD#PBF reliable?
The price and inventory of LT6100IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6100IDD#PBF is usually 5 days.
3.What payment methods are accepted for LT6100IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6100IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6100IDD#PBF?
LT6100IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6100IDD#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 LT6100IDD#PBF?
For technical support, including LT6100IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6100IDD#PBF requirements.
6.How does Aetrix verify that LT6100IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT6100IDD#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 LT6100IDD#PBF meets industry standards.
7.What is the process for return or replacement of LT6100IDD#PBF?
All LT6100IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6100IDD#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 LT6100IDD#PBF part is unused and in its original packaging.
Return procedure for LT6100IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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