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Analog Devices Inc. LT1787IS8#PBF
- Part No.:
- LT1787IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1787IS8#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:121
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Product details
Overview
LT1787IS8#PBF from Analog Devices (formerly Linear Technology) is a precision micropower high-side current sense amplifier with bidirectional sensing capability, fixed 8× gain, ±75 µV max input offset voltage (–40°C to 85°C), 60 µA supply current, and operation from 2.5 V to 36 V total supply voltage. It delivers >12-bit dynamic range for battery monitoring and portable power systems.
For engineers reviewing the LT1787IS8#PBF datasheet, LT1787IS8#PBF pinout, LT1787IS8#PBF application, or LT1787IS8#PBF equivalent, key selection factors include its unidirectional/bidirectional output flexibility, FIL+/FIL– noise filtering terminals, VBIAS-referenced output architecture, and SO-8 package compatibility with Kelvin-sense PCB layouts in high-accuracy current measurement designs.
Technical Context
The LT1787IS8#PBF implements a matched resistor-based current mirror topology with internal RG1A/RG2A (1.25 kΩ) gain-setting networks and ROUT (20 kΩ) output resistor, enabling precise 8× VSENSE amplification referenced to VBIAS. Its differential input stage rejects common-mode voltages up to VS+ – VS– = ±10 V while operating with PSRR >120 dB across 2.5 V–36 V supply range.
Input signal conditioning is supported via external capacitor between FIL+ and FIL– pins, forming a single-pole low-pass filter (f–3dB = 1/(2π × 1.25 kΩ × C)) to suppress high-frequency ripple above 300 kHz bandwidth. Output polarity is determined by sense direction: VOUT > VBIAS for VS+ > VS–; VOUT < VBIAS for VS+ < VS–.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5 V to 36 V total (VS– to VEE); supports wide-input industrial and battery-powered systems without external regulators. |
| Input Offset Voltage (max) | ±75 µV at TA = 25°C; ensures ≤2 mA resolution error with 20 mΩ sense resistor at 100 mV full-scale. |
| Gain Accuracy | ±3% gain error over temperature; enables direct interfacing with 12-bit ADCs like LTC1286 without calibration. |
| Supply Current | 60 µA typical; allows continuous current monitoring in ultra-low-power applications such as cellular phones and portable test equipment. |
| Operating Temperature | –40°C to +85°C (I-grade); qualified for automotive body electronics and industrial embedded control environments. |
| PSRR | >120 dB (2.5 V–36 V); maintains accuracy under noisy supply conditions typical in motor drives and DC/DC converter outputs. |
| Output Configuration | VOUT/VBIAS-referenced bidirectional output; supports split-supply (VBIAS = GND) or single-supply (VBIAS = 1.25 V) operation with rail-to-rail swing constraints. |
Pinout & Package
LT1787IS8#PBF is housed in an 8-lead plastic SO (Small Outline) package with standard JEDEC MS-012AC footprint (5.0 mm × 6.2 mm, 1.27 mm pitch). Pin 3 (DNC) must remain unconnected per datasheet specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FIL+ | Positive input filter terminal | Internally connected to midpoint of RG2A; used with FIL– to implement differential noise filtering (f–3dB = 1/(2π × 1.25 kΩ × C)). |
| VS+ | Positive sense input | Connects to high-side of RSENSE; sourcing current flows into VS+ when load draws current from VS+ to VS–. |
| VBIAS | Output bias reference | Sets zero-current output level; tied to GND for bipolar output or to external reference (e.g., LT1634-1.25) for single-supply bidirectional operation. |
| VOUT | Amplified output terminal | Delivers VOUT = 8 × VSENSE + VOUT(O) + VBIAS; swing limited to ≥30 mV above VEE and ≤(VS+ – 0.75 V). |
| FIL– | Negative input filter terminal | Internally connected to midpoint of RG1A; forms differential RC filter with FIL+ to attenuate high-frequency transients on sense line. |
| VS– | Negative sense input | Connects to low-side of RSENSE; sinking current flows out of VS– when load draws current from VS+ to VS–. |
| DNC | Do Not Connect | Internally connected; no external connection permitted to avoid performance degradation or damage. |
| VEE | Negative supply / ground | Provides return path for internal amplifier bias; tied to system ground in single-supply mode or negative rail in split-supply configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Enables charge/discharge current monitoring in battery management without shunt relocation or polarity switching circuitry. |
| User-selectable external RSENSE | Supports full-scale sense voltages from ±10 mV to ±500 mV; allows optimization of power loss vs. resolution for 1 A–100 A applications. |
| Integrated FIL+/FIL– filtering | Eliminates need for external op-amp-based anti-aliasing filters; reduces BOM count and layout area in space-constrained portable designs. |
| 12-bit dynamic range | Validated with LTC1286 ADC in unidirectional mode; achieves ≥4096:1 current ratio detection with <1 LSB error at 12-bit resolution. |
| –40°C to +85°C I-grade operation | Qualified per AEC-Q100 stress test conditions; suitable for under-hood automotive modules and industrial PLC analog input stages. |
Applications
| Battery Monitoring | Power Supply Monitoring |
|---|---|
Use Scenario: Real-time tracking of charge/discharge current in Li-ion battery packs for smartphones and tablets. IC Role / Device Role / Timing Role: High-side current sense amplifier providing bidirectional analog output referenced to VBIAS for MCU ADC sampling. Use Value: Enables accurate state-of-charge estimation with ±75 µV offset limiting current measurement error to <2 mA using 20 mΩ shunt. | Use Scenario: Input current supervision in isolated DC/DC converters for telecom base stations. IC Role / Device Role / Timing Role: Precision high-side monitor measuring primary-side current to detect overload and short-circuit faults. Use Value: PSRR >120 dB prevents false triggering from switching noise; 60 µA quiescent current avoids loading auxiliary bias supplies. |
| Portable Test Equipment | Automotive Body Control |
Use Scenario: Current profiling during functional testing of USB-C PD chargers and power banks. IC Role / Device Role / Timing Role: Fixed-gain current amplifier feeding buffered output to 12-bit SAR ADC for digital logging. Use Value: 12-bit dynamic range and ±3% gain error allow direct digitization without software gain correction in handheld instruments. | Use Scenario: Load current monitoring for smart fuses and electronic circuit breakers in vehicle door modules. IC Role / Device Role / Timing Role: High-side sense element detecting abnormal current draw before thermal cutoff activation. Use Value: –40°C to +85°C operation ensures reliability in engine bay proximity; SO-8 package supports automated optical inspection (AOI) in automotive SMT lines. |
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 |
|---|---|---|---|
| INA240A1DR | Higher 2.5 µV/°C VOS drift, 2.7 V–5.5 V supply, integrated 20 V ESD protection | Optimized for lower-voltage motor control; lacks FIL+/FIL– filtering terminals | Preferred for cost-sensitive 3.3 V systems where external filtering is implemented separately |
| MAX4080TASA+ | Unidirectional only, 100 µV max VOS, 4.5 V–76 V supply, no VBIAS pin | Designed for high-common-mode industrial sensors; requires external level-shifting for bidirectional use | Chosen when only positive current monitoring is needed and supply exceeds 60 V |
Compared with INA240A1DR and MAX4080TASA+, the LT1787IS8#PBF uniquely combines bidirectional sensing, user-configurable VBIAS referencing, and dedicated FIL+/FIL– filtering in a single SO-8 package-enabling compact, high-accuracy current measurement without external op-amps or discrete RC networks.
Availability
LT1787IS8#PBF is available at Aetrix Electronics and suitable for battery monitoring, power supply supervision, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1787IS8#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, datasheets, and application notes for the LT1787 family.
The LT1787 series was designed specifically for precision high-side current sensing in battery-powered and industrial systems where low quiescent current, wide supply range, and Kelvin-sense layout compatibility are critical.
FAQ
What is the maximum sense voltage range supported by the LT1787IS8#PBF?
The LT1787IS8#PBF supports differential sense voltages from ±10 mV to ±500 mV full-scale. At ±128 mV input, it delivers VOUT = VBIAS ± 1.024 V with 8× gain. The absolute maximum differential input is ±10 V, but full-scale accuracy is specified only up to ±500 mV per datasheet Section 4.
Can the LT1787IS8#PBF operate from a single 3.3 V supply?
Yes, the LT1787IS8#PBF operates from 2.5 V to 36 V total supply voltage. With VEE = GND and VBIAS = 1.25 V (e.g., LT1634-1.25), it provides bidirectional output swing from ~0.25 V to ~2.25 V - sufficient headroom for 3.3 V ADC interfaces. Minimum VS+ is 3.3 V to ensure VOUT does not saturate near VS+ – 0.75 V.
How does the FIL+ and FIL– filtering work on the LT1787IS8#PBF?
The FIL+ and FIL– pins connect internally to the midpoints of RG1A and RG2A (1.25 kΩ each). A capacitor placed between them forms a differential low-pass filter with f–3dB = 1/(2π × 1.25 kΩ × C). For example, a 0.01 µF capacitor sets f–3dB ≈ 12.7 kHz - effective for suppressing switching noise from DC/DC converters without affecting DC accuracy.
What is the purpose of the DNC pin on the LT1787IS8#PBF?
Pin 3 (DNC) on the LT1787IS8#PBF is "Do Not Connect." It is internally connected and must remain floating - no external trace, pad, or component may be attached. Connecting external circuitry risks degrading PSRR, increasing offset drift, or causing latch-up per datasheet Absolute Maximum Ratings and Pin Functions sections.
Does the LT1787IS8#PBF support Kelvin connections for the sense resistor?
Yes, the LT1787IS8#PBF explicitly recommends Kelvin connections for VS+ and VS– to the sense resistor in all but lowest-power applications. This minimizes errors from PCB trace resistance and solder joint impedance - critical for high-current systems where even 0.5 mΩ parasitic resistance introduces >5% error at 10 A, as detailed in Applications Information Section 10.
LT1787IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 40 µV
- Current - Supply:
- 60µA
- Current - Output / Channel:
- 50 µA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1787IS8#PBF FAQ
1.How can I place an order for LT1787IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1787IS8#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 LT1787IS8#PBF reliable?
The price and inventory of LT1787IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1787IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1787IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1787IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1787IS8#PBF?
LT1787IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1787IS8#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 LT1787IS8#PBF?
For technical support, including LT1787IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1787IS8#PBF requirements.
6.How does Aetrix verify that LT1787IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1787IS8#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 LT1787IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1787IS8#PBF?
All LT1787IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1787IS8#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 LT1787IS8#PBF part is unused and in its original packaging.
Return procedure for LT1787IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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