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Analog Devices Inc. LT1999IS8-20#PBF
- Part No.:
- LT1999IS8-20#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1999IS8-20#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:189
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Product details
Overview
LT1999IS8-20#PBF from Analog Devices is a high-speed, bidirectional current sense amplifier with 20V/V fixed gain, –5V to 80V input common mode range, 2MHz bandwidth, and ±0.5% gain accuracy. It senses current via external shunt resistor and outputs a voltage referenced to mid-supply or external REF, enabling precise monitoring in H-bridge motor control and battery charge/discharge systems.
For engineers reviewing the LT1999IS8-20#PBF datasheet, LT1999IS8-20#PBF pinout, LT1999IS8-20#PBF application, or LT1999IS8-20#PBF equivalent, this page delivers verified specifications, SO-8 package terminal mapping, automotive-grade temperature performance (–40°C to 85°C), and real-world use cases for high-side/low-side sensing in switching power supplies and PWM control loops.
Technical Context
The LT1999IS8-20#PBF employs a matched-resistor transconductance architecture with internal 4kΩ differential input impedance and on-chip 80kΩ gain-setting resistor (RG), delivering exact 20V/V gain without external components. Its dual-path biasing-via internal 160kΩ divider for VCM > V+ and integrated diode D1 for VCM < V+-ensures smooth, continuous operation across the full –5V to 80V common mode range without gain discontinuity or offset shift.
It features a shutdown pin (SHDN) with 0.5V logic threshold, 1μs turn-on/off timing, and low-power shutdown current <10μA. The output drives up to 200pF directly and supports external REF voltage override for custom output common-mode level setting, critical for interfacing with ADCs or controllers requiring specific input ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V fixed - eliminates external gain-setting resistors and ensures ±0.5% accuracy over temperature and common mode range. |
| Common Mode Range | –5V to 80V - enables direct high-side sensing in 48V industrial systems and low-side sensing down to negative rail, no level-shifting circuitry required. |
| Bandwidth | 2MHz - supports accurate current measurement in fast-switching DC-DC converters and PWM motor drives up to ~300kHz switching frequency. |
| Input Offset Voltage | ±1.5mV max - limits current measurement error to ≤75μA when using 75mΩ shunt, critical for precision battery fuel gauging. |
| Supply Current | 1.55mA active / <10μA shutdown - reduces system power budget in always-on monitoring applications like EV battery management. |
| Operating Temperature | –40°C to 85°C - qualified for industrial and automotive under-hood environments per I-grade specification. |
| ESD Rating | 4kV HBM, 1kV CDM - withstands handling and board-level ESD events without latch-up or parametric shift. |
Pinout & Package
LT1999IS8-20#PBF is housed in an 8-lead plastic SO (narrow) package (S8), RoHS-compliant, with standard SOIC footprint (5.0mm × 4.0mm, 1.27mm pitch). Pin 1 marked by notch or dot; thermal resistance θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pins 1, 4) | Power supply input | Internally tied pins accepting 4.5V–5.5V; dual connection improves PSRR and reduces supply noise coupling into sense path. |
| +IN (Pin 2) | Positive sense input | High-impedance node connected to shunt's high-potential side; matched with –IN for CMRR >96dB at DC. |
| –IN (Pin 3) | Negative sense input | High-impedance node connected to shunt's low-potential side; differential pair rejects common mode transients up to 50V/20ns. |
| GND (Pin 5) | Ground reference | Return path for internal bias currents and REF divider; must be low-impedance to avoid ground bounce affecting offset. |
| REF (Pin 6) | Output common-mode reference | Set to mid-supply by internal 160k/160k divider; externally overdrivable (1.125V to V+–1.125V) to interface with 3.3V or 2.5V ADC references. |
| OUT (Pin 7) | Amplified output | Low-impedance (0.15Ω) rail-to-rail capable output; drives 1kΩ loads to within 125mV of rails, compatible with SAR and sigma-delta ADC inputs. |
| SHDN (Pin 8) | Shutdown control | Active-low logic input; pulled internally to V+ via 2μA current source - floating = active, 0V = shutdown (<10μA quiescent). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Outputs positive voltage for current flow in one direction, negative relative to REF for reverse flow - enables regenerative braking and battery charging/discharging detection. |
| FMEA-optimized pinout option available | MSOP variant (LT1999IMS8-20F#PBF) relocates NC to Pin 3 to prevent mis-soldering-induced short circuits - not applicable to SO-8 LT1999IS8-20#PBF but confirms functional safety design intent. |
| Smooth common mode transition | No gain or offset discontinuity when VCM crosses V+ - eliminates measurement glitches during startup or fault recovery in 48V telecom power systems. |
| AEC-Q100 qualified | I-grade SO-8 version meets stress test requirements for automotive applications including HTOL, TCT, and ESD - validated for under-hood motor control modules. |
| High AC CMRR | >80dB at 100kHz - rejects high-frequency noise from adjacent switching MOSFETs, preserving signal integrity in compact power stage layouts. |
Applications
| H-Bridge Motor Control | Switching Power Supply |
|---|---|
Use Scenario: Monitoring bidirectional armature current in brushed DC or BLDC motor drivers during forward/reverse rotation and braking. IC Role / Device Role / Timing Role: High-side or low-side current sense amplifier providing real-time feedback to PWM controller for torque regulation and overcurrent protection. Use Value: 2MHz bandwidth captures current ripple at 200kHz switching frequencies; ±0.5% gain accuracy ensures consistent current limit triggering across temperature. | Use Scenario: Measuring inductor or MOSFET current in synchronous buck/boost converters for peak-current-mode control and cycle-by-cycle limiting. IC Role / Device Role / Timing Role: Precision analog front-end converting shunt voltage to clean, rail-compatible output for ADC sampling or comparator input. Use Value: –5V to 80V common mode range allows direct high-side sensing without isolated amplifiers, reducing BOM cost and layout area. |
| Battery Charge/Discharge Monitoring | PWM-Controlled Solenoid Driver |
Use Scenario: Tracking charge/discharge current in 12V–48V battery packs from full charge to depletion, including reverse current during regenerative braking. IC Role / Device Role / Timing Role: Bidirectional current sensor feeding data to fuel gauge IC or microcontroller ADC for state-of-charge calculation. Use Value: ±1.5mV offset ensures <100μA measurement error with 100mΩ shunt - critical for detecting low standby currents and micro-coulomb-level coulomb counting. | Use Scenario: Monitoring solenoid coil current in industrial valves or automotive transmission actuators to detect open-circuit faults and confirm pull-in engagement. IC Role / Device Role / Timing Role: Fast-response current monitor providing real-time feedback to MCU for PWM duty cycle adjustment and stall detection. Use Value: 1μs turn-on time enables immediate current capture after PWM edge; 2.5μs settling time ensures accurate peak current reading within single PWM period. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1DR | 20V/V gain, –4V to 80V common mode, 4.5MHz bandwidth, 5V supply only, 100nV/√Hz noise | Higher bandwidth and lower noise suit high-frequency power supplies; lacks REF pin flexibility and shutdown feature | Select for ultra-fast transient response where REF customization is unnecessary |
| MAX4080TASA+ | 20V/V gain, –0.1V to 65V common mode, 2.5MHz bandwidth, 3.3V/5V supply, no shutdown | Narrower common mode range limits high-voltage applications; no SHDN pin reduces power savings in intermittent monitoring | Select for cost-sensitive 3.3V systems where 65V max common mode suffices |
Compared with INA240A1DR and MAX4080TASA+, the LT1999IS8-20#PBF uniquely combines REF pin programmability, true shutdown capability, and seamless –5V to 80V operation - making it optimal for automotive and industrial designs requiring flexible output referencing and low-quiescent-power sleep modes.
Availability
LT1999IS8-20#PBF is available at Aetrix Electronics and suitable for H-bridge motor control, switching power supply current sensing, and battery management systems requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for LT1999IS8-20#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1999 product line delivers precision, high-voltage current sensing for demanding power conversion and motor control applications - designed specifically for robustness in noisy, wide common-mode environments where accuracy and reliability are non-negotiable.
FAQ
What is the maximum common mode voltage the LT1999IS8-20#PBF can handle?
The LT1999IS8-20#PBF supports an input common mode voltage range of –5V to 80V. This allows direct high-side sensing in 48V and 60V industrial systems without external level-shifting circuitry. Absolute maximum ratings specify –5.25V to 88V for transient conditions, but sustained operation is guaranteed only within the –5V to 80V range per datasheet specifications.
Does the LT1999IS8-20#PBF require external gain-setting resistors?
No, the LT1999IS8-20#PBF does not require external gain-setting resistors. It integrates an on-chip 80kΩ resistor (RG) matched to its internal 4kΩ differential input network to deliver a precise, factory-trimmed 20V/V gain. This eliminates gain drift due to external resistor tolerances and temperature coefficients, ensuring ±0.5% gain accuracy over temperature and common mode range.
How does the REF pin function in the LT1999IS8-20#PBF?
The REF pin in the LT1999IS8-20#PBF sets the output common-mode voltage. Internally biased to mid-supply (2.5V at 5V V+) via 160kΩ resistors, it can be overdriven by an external voltage source within 1.125V to (V+ – 1.125V). This allows direct interfacing with 3.3V or 2.5V ADC references without level-shifting, preserving measurement accuracy and simplifying system design.
What is the shutdown current consumption of the LT1999IS8-20#PBF?
The LT1999IS8-20#PBF draws less than 10μA in shutdown mode when the SHDN pin is pulled below 0.5V. This ultra-low quiescent current enables energy-efficient operation in battery-powered or intermittently active systems such as portable test equipment or remote sensor nodes where power budget is constrained.
Is the LT1999IS8-20#PBF suitable for automotive applications?
Yes, the LT1999IS8-20#PBF is qualified per AEC-Q100 Grade I (–40°C to +85°C) and is explicitly listed in Analog Devices' automotive product portfolio. Its 4kV HBM ESD rating, robust common mode transient immunity, and guaranteed performance across temperature make it suitable for engine control units, body electronics, and electric power steering modules.
LT1999IS8-20#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:
- 3V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 MHz
- Current - Input Bias:
- 137.5 µA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 5.8mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1999IS8-20#PBF FAQ
1.How can I place an order for LT1999IS8-20#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999IS8-20#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 LT1999IS8-20#PBF reliable?
The price and inventory of LT1999IS8-20#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999IS8-20#PBF is usually 5 days.
3.What payment methods are accepted for LT1999IS8-20#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999IS8-20#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999IS8-20#PBF?
LT1999IS8-20#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999IS8-20#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 LT1999IS8-20#PBF?
For technical support, including LT1999IS8-20#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999IS8-20#PBF requirements.
6.How does Aetrix verify that LT1999IS8-20#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999IS8-20#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 LT1999IS8-20#PBF meets industry standards.
7.What is the process for return or replacement of LT1999IS8-20#PBF?
All LT1999IS8-20#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999IS8-20#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 LT1999IS8-20#PBF part is unused and in its original packaging.
Return procedure for LT1999IS8-20#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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