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Analog Devices Inc. LT1787CMS8#PBF
- Part No.:
- LT1787CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1787CMS8#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:134
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Product details
Overview
LT1787CMS8#PBF from Analog Devices (formerly Linear Technology) is a precision micropower high-side current sense amplifier with fixed 8× gain, bidirectional sensing capability, ±40 µV max input offset voltage (25°C), 12-bit dynamic range, and 60 µA supply current. It operates from 2.5 V to 36 V total supply voltage and supports Kelvin-connected external shunt resistors for battery monitoring and portable power systems.
For engineers reviewing the LT1787CMS8#PBF datasheet, LT1787CMS8#PBF pinout, LT1787CMS8#PBF application, or LT1787CMS8#PBF equivalent, key selection criteria include input offset stability over temperature, unidirectional/bidirectional output configuration flexibility, FIL+/FIL– noise filtering support, and MS8 package compatibility with space-constrained PCB layouts.
Technical Context
The LT1787CMS8#PBF uses matched internal 1.25 kΩ gain-setting resistors (RG1A/RG2A) and a precision current-mirror architecture to deliver fixed 8 V/V gain with >120 dB PSRR. Its differential sense inputs (VS+, VS–) reject common-mode voltages up to 36 V while maintaining accuracy across –40°C to 85°C.
Input signal filtering is implemented via external capacitor between FIL+ and FIL– pins, forming a single-pole low-pass filter (f–3dB = 1/(2π × 1.25 kΩ × C)). Output is developed across a 20 kΩ internal ROUT resistor, enabling voltage or current output modes depending on VBIAS connection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 8 V/V (±3% gain error) - eliminates external gain-setting components and ensures consistent scaling of sense voltage to output. |
| Input Offset Voltage | ±40 µV max (25°C), ±200 µV max (–40°C to 85°C) - enables accurate measurement of sub-10 mA currents with 20 mΩ shunt. |
| Supply Range | 2.5 V to 36 V total (VS+ – VEE) - supports wide-input industrial and battery-powered systems without level-shifting circuitry. |
| Quiescent Current | 60 µA - allows continuous monitoring in energy-sensitive applications like cellular phones and portable test equipment. |
| Dynamic Range | >12-bit (≥500 mV full-scale input, 40 µV offset) - provides resolution down to ~0.08 LSB per mA with 20 mΩ shunt at 10 A full scale. |
| PSRR | >120 dB (2.5 V–36 V supply variation) - maintains output accuracy despite ripple or noise on high-side supply rail. |
| Operating Temp | –40°C to +85°C - qualified for commercial/industrial environments including battery management and power monitoring subsystems. |
Pinout & Package
LT1787CMS8#PBF is housed in an 8-lead MSOP (MS8) package with exposed pad (thermal performance θJA = 250°C/W). Pin functions are validated per Linear Technology's 1787fc datasheet and functional diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FIL+ | Positive input filter terminal | Connected to midpoint of RG2A; used with FIL– to add external RC filter for high-frequency noise rejection (f–3dB = 1/(2π × 1.25 kΩ × C)). |
| VS+ | Positive sense input | Connects to high-side of shunt; sourcing current through RG2A generates proportional output when VS+ > VS–. |
| VBIAS | Output bias reference | Sets zero-current output level: grounded for split-supply bidirectional mode; externally biased (e.g., 1.25 V) for single-supply bidirectional operation. |
| VOUT | Amplified output node | Delivers voltage output VOUT = 8 × (VS+ – VS–) + VOUT(O) + VBIAS; swing limited to ≥30 mV above VEE and ≤(VS+ – 0.75 V). |
| FIL– | Negative input filter terminal | Connected to midpoint of RG1A; forms differential filter pair with FIL+ to suppress EMI without degrading CMRR. |
| VS– | Negative sense input | Connects to low-side of shunt; sinking current through RG1A generates inverted output when VS+ < VS–. |
| DNC | Do Not Connect | Internally connected; no external connection permitted - floating or tied to ground causes undefined behavior. |
| VEE | Negative supply / ground | Reference for internal amplifier and current mirror; may be grounded in single-supply configurations or set negative for extended bipolar output swing. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Enables real-time charge/discharge current monitoring in battery packs without ground-referenced shunt placement. |
| User-selectable external RSENSE | Supports shunt values from 1 mΩ to 100 mΩ - balances power loss (I²R) vs. SNR for 100 mA–100 A applications. |
| Integrated FIL+/FIL– filtering | Eliminates need for external op-amp-based anti-aliasing filters; simplifies layout and reduces BOM count in motor drives and SMPS. |
| Unidirectional or bidirectional output | VBIAS pin configures output polarity: 0 V reference for unidirectional load monitoring; adjustable bias for symmetric ±VOUT swing in data acquisition. |
| Ultralow 60 µA quiescent current | Extends runtime in always-on battery monitoring circuits - e.g., 10-year life on CR2032 with 1-second sampling interval. |
Applications
| Battery Monitoring | Power Monitoring |
|---|---|
Use Scenario: Real-time Coulomb counting in Li-ion battery packs for portable medical devices. IC Role / Device Role / Timing Role: High-side current sense amplifier measuring bidirectional cell current with <±200 µV offset drift over –20°C to 60°C. Use Value: Enables accurate state-of-charge estimation within ±1.5% error over 500 cycles using 10 mΩ shunt and LTC1286 ADC interface. | Use Scenario: Input current supervision in 24 V industrial PLC power supplies. IC Role / Device Role / Timing Role: Precision high-side monitor detecting overcurrent events with 100 µs response time and 12-bit resolution. Use Value: Provides fast fault detection (<100 µs) and analog feedback to microcontroller without burdening system ground plane. |
| Portable Phones | Portable Test/Measurement Systems |
Use Scenario: Charging current profiling during USB-C PD negotiation in smartphones. IC Role / Device Role / Timing Role: Bidirectional current sensor interfaced to application processor ADC with VBIAS = 1.25 V reference. Use Value: Delivers ±100 mA measurement accuracy with 12-bit linearity, supporting adaptive charging algorithms and thermal management. | Use Scenario: Current sourcing/sinking verification in handheld multimeters with autoranging. IC Role / Device Role / Timing Role: High-accuracy sense amplifier driving 12-bit SAR ADC with programmable gain stage. Use Value: Achieves 0.1% full-scale accuracy across 100 µA–10 A ranges using auto-switched shunts and calibrated offset compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4080TASA+ | Higher 100 V supply rating, 500 kHz bandwidth, but 200 µV max offset and 100 µA IQ. | Better suited for high-voltage DC-DC converters; less optimal for ultra-low-power battery monitoring. | Select when >36 V operation or faster transient response is required; verify layout for higher bandwidth stability. |
| INA240A1DGNR | 2.7 V–80 V supply, 120 dB PSRR, 5 µV/°C VOS TC, but 1.1 mA IQ and no FIL+/FIL– filtering pins. | Optimized for motor control with enhanced ESD robustness; lacks integrated input filtering for noisy SMPS environments. | Prefer for high-temperature automotive applications where offset drift dominates; accept higher quiescent current for improved CMRR. |
Compared with MAX4080TASA+ and INA240A1DGNR, LT1787CMS8#PBF offers the lowest quiescent current (60 µA) and dedicated FIL+/FIL– filtering for noise-prone portable systems, while trading off maximum supply voltage and temperature range for micropower precision.
Availability
LT1787CMS8#PBF is available at Aetrix Electronics and suitable for battery monitoring, power monitoring, and portable test/measurement systems requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for LT1787CMS8#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, datasheet documentation, and application engineering resources for legacy Linear parts.
The LT1787 family was designed specifically for precision, low-power, high-side current sensing in portable and battery-operated systems - emphasizing micropower operation, Kelvin-compatible layout, and flexible unidirectional/bidirectional output configuration.
FAQ
What is the maximum supply voltage rating for LT1787CMS8#PBF?
The LT1787CMS8#PBF has a maximum total supply voltage (VS+ – VEE) rating of 40 V. It operates over 2.5 V to 36 V, with absolute maximum rating at 40 V. Exceeding this risks permanent damage. The LT1787HV variant supports up to 60 V, but LT1787CMS8#PBF is the standard-voltage version.
Does LT1787CMS8#PBF support bidirectional current sensing?
Yes, LT1787CMS8#PBF supports true bidirectional high-side current sensing. When VS+ > VS–, VOUT rises above VBIAS; when VS+ < VS–, VOUT falls below VBIAS. This requires VBIAS to be externally biased (e.g., 1.25 V) in single-supply configurations, as shown in Figure 4 of the 1787fc datasheet.
What is the purpose of the FIL+ and FIL– pins on LT1787CMS8#PBF?
The FIL+ and FIL– pins on LT1787CMS8#PBF provide access to internal resistor midpoints for adding external RC filtering. Connecting a capacitor between them creates a single-pole low-pass filter (f–3dB = 1/(2π × 1.25 kΩ × C)) to suppress high-frequency noise without affecting common-mode rejection - critical in switch-mode power supply monitoring.
Can LT1787CMS8#PBF be used with a single 3.3 V supply?
Yes, LT1787CMS8#PBF operates down to 2.5 V total supply. With 3.3 V, VEE = 0 V and VBIAS = 1.25 V (e.g., LT1634-1.25), VOUT swings from ~1.22 V to ~2.27 V for ±128 mV sense input - sufficient headroom for most 12-bit ADCs. Figure 4 in the datasheet validates this configuration.
What is the output impedance of LT1787CMS8#PBF?
The LT1787CMS8#PBF has a nominal 20 kΩ output resistance (ROUT) between VOUT and VBIAS, confirmed in Electrical Characteristics tables and Block Diagram Figure 1. This defines its voltage output compliance and must be considered when driving capacitive loads or low-impedance ADC inputs - buffer amplifiers are recommended for >100 pF loads.
LT1787CMS8#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:
- -
- 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1787CMS8#PBF FAQ
1.How can I place an order for LT1787CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1787CMS8#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 LT1787CMS8#PBF reliable?
The price and inventory of LT1787CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1787CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1787CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1787CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1787CMS8#PBF?
LT1787CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1787CMS8#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 LT1787CMS8#PBF?
For technical support, including LT1787CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1787CMS8#PBF requirements.
6.How does Aetrix verify that LT1787CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1787CMS8#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 LT1787CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1787CMS8#PBF?
All LT1787CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1787CMS8#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 LT1787CMS8#PBF part is unused and in its original packaging.
Return procedure for LT1787CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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