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Analog Devices Inc. LT1787CS8#PBF
- Part No.:
- LT1787CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1787CS8#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,696
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Product details
Overview
LT1787CS8#PBF from Analog Devices (formerly Linear Technology) is a precision micropower high-side current sense amplifier with fixed 8× gain, bidirectional sensing capability, ±75 µV max input offset voltage (S8 package), 12-bit dynamic range, and operation from 2.5 V to 36 V total supply voltage. It delivers accurate current monitoring in battery-powered portable phones and power management systems where low quiescent current (60 µA) and high common-mode rejection (>120 dB PSRR) are critical.
For engineers reviewing the LT1787CS8#PBF datasheet, LT1787CS8#PBF pinout, LT1787CS8#PBF application, or LT1787CS8#PBF equivalent, key selection factors include its 8-lead SO package, unidirectional/bidirectional output configuration via VBIAS control, user-selectable external sense resistor, integrated input filtering (FIL+/FIL−), and guaranteed performance over –40°C to 85°C for industrial-grade reliability.
Technical Context
The LT1787CS8#PBF implements a matched-resistor current mirror architecture with internal 1.25 kΩ gain-setting resistors (RG1A/RG2A) and 20 kΩ output resistor (ROUT), enabling precise 8× VSENSE amplification independent of external components. Its differential input stage rejects common-mode voltages up to 36 V while maintaining ultralow offset drift (0.5–2 µV/°C).
Operation supports both split-supply (VEE grounded or negative) and single-supply configurations via programmable VBIAS, allowing flexible interfacing with ADCs (e.g., LTC1286), op-amps, or microcontrollers. Input noise filtering is implemented externally via capacitor between FIL+ and FIL− pins, establishing a configurable low-pass corner at f–3dB = 1/(2π × 1.25 kΩ × C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5 V to 36 V total (VS+ − VEE); enables direct integration into 3.3 V, 5 V, 12 V, and 24 V systems without level-shifting. |
| Input Offset Voltage (max) | ±75 µV at TA = 25°C (S8 package); ensures ≤2 mA resolution error with 20 mΩ sense resistor at 100 mV full-scale. |
| Fixed Gain | 8 V/V (±3% gain error); eliminates external gain-setting components and reduces layout sensitivity. |
| Quiescent Current | 60 µA typical; supports >1-year battery life in always-on current monitoring applications. |
| PSRR | >120 dB (2.5 V–36 V range); maintains accuracy despite ripple on high-side supply rail. |
| Operating Temperature | –40°C to +85°C (C-grade); qualified for consumer and industrial portable electronics environments. |
| Dynamic Range | 12-bit (≥4096:1); supports wide current measurement spans (e.g., 10 mA to 10 A) with single device. |
Pinout & Package
LT1787CS8#PBF is housed in an 8-lead plastic SO (Small Outline) package (S8), RoHS-compliant and lead-free (#PBF suffix). Pin 3 (DNC) is internally connected and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FIL+ | Positive input filter terminal | Internally tied to midpoint of RG2A; connects with FIL− to form RC low-pass filter for high-frequency noise rejection. |
| VS+ | Positive sense input | Connects to high-side of sense resistor; sourcing current flows when VS+ > VS−. |
| VBIAS | Output bias reference | Sets zero-current output level; grounded for split-supply bidirectional mode, biased externally for single-supply operation. |
| VOUT | Amplified output | Delivers voltage proportional to VSENSE × 8 + VBIAS; swing limited to ≥30 mV above VEE and ≤(VS+ − 0.75 V). |
| FIL− | Negative input filter terminal | Internally tied to midpoint of RG1A; pairs with FIL+ for differential input filtering. |
| VS− | Negative sense input | Connects to low-side of sense resistor; sinking current flows when VS+ < VS−. |
| DNC | Do Not Connect | Internally connected node; no external connection permitted to avoid performance degradation. |
| VEE | Negative supply / ground | Reference for internal circuitry; may be grounded (single supply) or negative (split supply) depending on configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Measures load current flow direction and magnitude without breaking ground path-enables charge/discharge monitoring in battery systems. |
| User-selectable external RSENSE | Supports custom full-scale ranges (e.g., 10 mV to 500 mV); decouples power loss vs. resolution trade-off from IC design. |
| Integrated input filtering interface | FIL+/FIL− pins simplify EMI mitigation with single capacitor-no added op-amp or passive network required. |
| Unidirectional or bidirectional output | VBIAS pin configures output polarity: grounded for bipolar swing, externally biased for unipolar or shifted-bipolar operation. |
| Ultralow 60 µA supply current | Reduces system-level power budget impact-critical for always-on health monitoring in portable devices. |
Applications
| Battery Monitoring | Power Monitoring |
|---|---|
Use Scenario: Real-time tracking of charging/discharging current in lithium-ion battery packs for smartphones and wearables. 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 coulomb counting with ≤2 mA resolution using 20 mΩ RSENSE, supporting accurate state-of-charge estimation over full temperature range. | Use Scenario: Continuous current monitoring in DC-DC converter output rails for overcurrent protection and efficiency optimization. IC Role / Device Role / Timing Role: Precision sense amplifier interfaced to protection controller or digital power manager via buffered VOUT signal. Use Value: Delivers 12-bit dynamic range and >120 dB PSRR to reject switching noise, ensuring reliable fault detection even under heavy load transients. |
| Portable Phones | Portable Test/Measurement Systems |
Use Scenario: In-line current sensing for USB-C power delivery negotiation and adapter authentication circuits. IC Role / Device Role / Timing Role: Micropower current monitor operating from 3.3 V supply, feeding analog signal to USB PD controller's ADC input. Use Value: 60 µA quiescent current minimizes standby drain; ±75 µV offset ensures accurate low-current detection during sleep mode. | Use Scenario: High-accuracy current sourcing/sinking verification in handheld multimeters and portable calibrators. IC Role / Device Role / Timing Role: Reference-grade sense amplifier with Kelvin-connected inputs, driving precision DAC or display driver. Use Value: Matched internal resistors and low TC offset (0.5–2 µV/°C) maintain calibration integrity across operating temperature range. |
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 |
|---|---|---|---|
| MAX4080TASA+ | Higher gain options (10×, 20×, 50×); 2.7 V–76 V supply; 125 µV max offset (SO8); 75 µA IQ | Preferred for wider supply range and programmable gain; less suitable for ultra-low-power designs requiring <60 µA IQ | Select MAX4080TASA+ when higher common-mode voltage (up to 76 V) or multiple gain options are needed. |
| INA240A1DR | 2.7 V–80 V supply; 20 µV max offset; 1.1 mA IQ; 20×/50×/100× gains; SO-8 package | Superior offset and bandwidth but significantly higher quiescent current; optimized for motor control, not portable battery systems | Select INA240A1DR when sub-20 µV offset and fast response (<1 µs) are mandatory, and power budget allows >1 mA IQ. |
Compared with MAX4080TASA+ and INA240A1DR, the LT1787CS8#PBF uniquely balances micropower operation (60 µA), precision (±75 µV offset), and flexible bidirectional output configuration in a cost-effective SO-8 package-making it optimal for battery-constrained portable electronics rather than high-speed industrial or wide-VCM applications.
Availability
LT1787CS8#PBF is available at Aetrix Electronics and suitable for battery monitoring, portable phones, and portable test/measurement systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1787CS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT1787CS8#PBF belongs to Linear's precision current sense amplifier product line, engineered specifically for high-accuracy, low-power, high-common-mode-voltage current monitoring in portable, automotive, and industrial power systems.
FAQ
What is the maximum common-mode voltage supported by the LT1787CS8#PBF?
The LT1787CS8#PBF supports a total supply voltage of up to 36 V (VS+ − VEE), enabling operation with common-mode voltages up to 36 V referenced to VEE. It is not rated for 60 V operation-that specification applies only to the LT1787HV variant. The LT1787CS8#PBF is specified for 2.5 V to 36 V total supply, making it suitable for 12 V and 24 V systems but not 48 V telecom or industrial rails.
Can the LT1787CS8#PBF measure bidirectional current with a single supply?
Yes, the LT1787CS8#PBF can measure bidirectional current with a single supply by applying an external bias voltage to the VBIAS pin. When VBIAS is set to a mid-rail voltage (e.g., 1.25 V or 2.5 V), VOUT swings above and below VBIAS to indicate direction-positive for VS+ > VS−, negative for VS+ < VS−. This configuration is explicitly validated in the datasheet's Figure 4 and Figure 5.
What is the purpose of the FIL+ and FIL− pins on the LT1787CS8#PBF?
The FIL+ and FIL− pins on the LT1787CS8#PBF provide access to internal resistor midpoints (RG1A and RG2A) for implementing differential input filtering. Connecting a capacitor between them forms a first-order low-pass filter with f–3dB = 1/(2π × 1.25 kΩ × C), suppressing high-frequency noise before amplification-critical for clean measurements in noisy switch-mode power supply environments.
Does the LT1787CS8#PBF require external gain-setting resistors?
No, the LT1787CS8#PBF does not require external gain-setting resistors. It features onboard precision 1.25 kΩ resistors (RG1A, RG2A) that fix the gain at 8 V/V with ±3% error over temperature. This eliminates component count, layout sensitivity, and matching errors associated with discrete gain networks-simplifying design and improving production yield.
What is the minimum output voltage swing of the LT1787CS8#PBF?
The LT1787CS8#PBF guarantees a minimum output voltage of ≥30 mV above VEE under all operating conditions, with typical saturation voltage as low as 10 mV when VSENSE = –128 mV and VBIAS = 0 V. This rail-to-rail–like low-end swing enables accurate low-current detection in unidirectional applications without requiring level-shifting circuitry.
LT1787CS8#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
LT1787CS8#PBF FAQ
1.How can I place an order for LT1787CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1787CS8#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 LT1787CS8#PBF reliable?
The price and inventory of LT1787CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1787CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1787CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1787CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1787CS8#PBF?
LT1787CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1787CS8#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 LT1787CS8#PBF?
For technical support, including LT1787CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1787CS8#PBF requirements.
6.How does Aetrix verify that LT1787CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1787CS8#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 LT1787CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1787CS8#PBF?
All LT1787CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1787CS8#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 LT1787CS8#PBF part is unused and in its original packaging.
Return procedure for LT1787CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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