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Analog Devices Inc. LT1999HS8-50#TRPBF
- Part No.:
- LT1999HS8-50#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1999HS8-50#TRPBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,354
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Product details
Overview
LT1999HS8-50#TRPBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with 50V/V fixed gain, –5V to 80V input common mode range, 1.2MHz small-signal bandwidth, and ±0.5% gain accuracy-designed for precision H-bridge motor control current monitoring in automotive-grade industrial systems.
For engineers reviewing the LT1999HS8-50#TRPBF datasheet, LT1999HS8-50#TRPBF pinout, LT1999HS8-50#TRPBF application, or LT1999HS8-50#TRPBF equivalent, this page delivers verified package mapping (8-lead SO), FMEA-optimized pinout validation, shutdown current <25µA at 150°C, and real-world use cases including battery charge/discharge monitoring and PWM loop sensing where high-side/low-side continuity across wide voltage transients is critical.
Technical Context
The LT1999HS8-50#TRPBF employs a matched resistor-based transconductance architecture with internal 4kΩ differential input impedance and on-chip 200kΩ gain-setting resistor (RG) to achieve its 50V/V transfer function. Its dual-path biasing-using D1 conduction below V+ and open-loop GIN operation above V+-ensures smooth, continuous operation across the full –5V to 80V common mode range without gain discontinuity or offset shift.
It features a mid-supply reference architecture with 160kΩ/160kΩ divider, REF pin input impedance of 60–100kΩ, and output stage capable of sourcing 3–40mA and sinking 10–40mA into loads-enabling direct interface with ADCs or comparators without external buffering in most 5V-rail applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V fixed-converts ±80mV shunt voltage to ±4V output, enabling full-scale resolution with 12-bit ADCs at 5V supply. |
| Common Mode Range | –5V to 80V-supports direct high-side sensing in 48V battery systems and low-side sensing down to negative rail in solenoid drivers. |
| Bandwidth | 1.2MHz-captures fast current transients in 100kHz+ PWM motor control loops with <0.5% gain error. |
| Input Offset Voltage | ±500µV max-limits current measurement error to <10mA when using 50mΩ shunt at 50V/V gain. |
| Supply Current | 1.55mA typical at VCM > 5.5V-enables always-on monitoring in power-constrained automotive ECUs. |
| Shutdown Current | ≤25µA at 150°C-maintains ultra-low quiescent power during sleep modes in MP-grade thermal environments. |
| Operating Temperature | –40°C to 125°C-qualified per AEC-Q100 Grade H for under-hood automotive applications. |
Pinout & Package
LT1999HS8-50#TRPBF is housed in an 8-lead plastic SO (narrow) package (S8), with pin 1 located at the top-left corner when viewed from the top with marking side up. The device uses the standard SO pinout-not the MSOP-FMEA variant-and supports lead-free reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pins 1, 4) | Power supply input | Internally tied pins accepting 4.5V–5.5V; dual connection reduces supply path inductance and improves PSRR. |
| +IN (Pin 2) | Positive sense input | High-impedance node (≥5MΩ) for connecting to high-side of shunt; ESD-protected to –5.25V. |
| –IN (Pin 3) | Negative sense input | Matched to +IN; differential input pair enables rejection of common-mode noise in noisy motor drive environments. |
| GND (Pin 5) | Ground reference | Return path for REF divider and output stage; must be star-connected to shunt ground for optimal CMRR. |
| REF (Pin 6) | Output common-mode reference | Sets output midpoint; accepts external voltage (1.125V to V+–1.125V) to shift output range for single-supply ADC interfacing. |
| OUT (Pin 7) | Amplified output | Low-impedance (0.15Ω) rail-to-rail capable output; drives ≤200pF directly, ≥100Ω series resistor required beyond that. |
| SHDN (Pin 8) | Active-low shutdown control | Pulled low (<0.5V) disables amplifier and reduces supply current to ≤25µA; floating or pulled high (>V+–0.5V) enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Outputs positive/negative voltage relative to REF to indicate current direction-enables regenerative braking detection in motor controllers. |
| Smooth CM transition | No gain or offset discontinuity across –5V to 80V range-eliminates calibration gaps when sensing across supply rails in half-bridge configurations. |
| 4kV HBM ESD rating | Robust input protection allows direct placement near MOSFET switches without external TVS diodes in 48V automotive systems. |
| FMEA-optimized variants available | While LT1999HS8-50#TRPBF uses standard SO pinout, FMEA versions (e.g., LT1999HS8-50F#TRPBF) relocate NC to Pin 3 to prevent misconnection-induced latch-up. |
| AEC-Q100 qualified | Validated for automotive Grade H (–40°C to 125°C) with lifetime reliability data supporting 1000+ hours at 150°C junction temperature. |
Applications
| H-Bridge Motor Control | Solenoid Current Sense |
|---|---|
Use Scenario: Monitoring bidirectional armature current in 24V/48V brushed DC motor drives with PWM switching up to 100kHz. IC Role / Device Role / Timing Role: High-side or low-side current sense amplifier providing real-time magnitude/direction feedback to MCU for closed-loop torque control. Use Value: 1.2MHz bandwidth captures edge transients; ±0.5% gain accuracy ensures <2% current measurement error over temperature-critical for stall detection and commutation timing. | Use Scenario: Measuring energizing/de-energizing current in automotive fuel injectors or transmission solenoids operating from –5V to 36V battery rails. IC Role / Device Role / Timing Role: Precision analog front-end converting shunt voltage to clean, referenced output for ADC sampling during fast turn-on/turn-off events. Use Value: Common mode step recovery time of 1.3µs (for LT1999-50) ensures output settles within 2µs after 50V transient-preventing false overcurrent triggers during solenoid switching. |
| Battery Charge/Discharge Monitoring | PWM Control Loops |
Use Scenario: Bidirectional current sensing in 48V EV auxiliary battery systems tracking charge state from full charge to depletion across –5V to 60V pack voltage. IC Role / Device Role / Timing Role: High-voltage current monitor interfaced to isolated ADC via REF-adjusted output swing, enabling accurate Coulomb counting. Use Value: Input common mode range extends to –5V, allowing measurement during deep discharge; ±500µV offset limits accumulated error to <0.5% over full SoC range with 10mΩ shunt. | Use Scenario: Real-time current feedback in digital power supply controllers regulating buck/boost converters with 500kHz–1MHz switching frequencies. IC Role / Device Role / Timing Role: Fast-settling analog sensor feeding current-mode control loop with minimal phase lag. Use Value: 2.5µs 0.5% settling time on ±2V output steps ensures <1% control loop delay penalty-even at 1MHz PWM, preserving stability margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage bidirectional current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 20V/V gain only; 80V common mode; 4V/V to 100V/V programmable gain not supported; lower 10ppm/°C gain drift vs. LT1999's 50ppm/°C. | Requires external gain scaling for 50× sensitivity; better suited for cost-sensitive automotive body electronics than high-precision motor control. | Select if gain flexibility is unnecessary and long-term drift performance is prioritized over bandwidth (INA240A1: 0.5MHz vs. LT1999HS8-50: 1.2MHz). |
| MAX40056ATA+T | 50V/V gain option available; 65V common mode (vs. 80V); no shutdown pin; higher 2.5mV max offset (vs. ±0.5mV). | Lacks SHDN functionality-unsuitable for low-power sleep modes; limited to ≤65V systems like 48V mild hybrids. | Select only for space-constrained designs where 3mm × 3mm TDFN-8 is mandatory and 80V CMR is not required. |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the LT1999HS8-50#TRPBF uniquely delivers 80V common mode tolerance, integrated shutdown, and 1.2MHz bandwidth in a standard SO-8 package-making it the only choice for high-dynamic-range, thermally demanding H-bridge monitoring where both voltage headroom and fast transient response are non-negotiable.
Availability
LT1999HS8-50#TRPBF is available at Aetrix Electronics and suitable for automotive powertrain control, industrial motor drives, and renewable energy inverters requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LT1999HS8-50#TRPBF 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 since 1965.
The LT1999 product line was engineered specifically for high-voltage, high-accuracy bidirectional current sensing in safety-critical automotive and industrial motion control-emphasizing robustness across extreme common mode transients and guaranteed operation from –40°C to 125°C.
FAQ
What is the maximum common mode voltage the LT1999HS8-50#TRPBF can handle?
The LT1999HS8-50#TRPBF supports a continuous input common mode voltage range of –5V to 80V. This is validated per Absolute Maximum Ratings and Electrical Characteristics tables, enabling direct high-side sensing in 48V battery systems and compatibility with negative-rail solenoid drivers. Operation beyond 80V risks triggering internal ESD clamps and is not guaranteed.
Does the LT1999HS8-50#TRPBF require external resistors for gain setting?
No. The LT1999HS8-50#TRPBF integrates a precision 200kΩ gain-setting resistor (RG) matched to its internal 4kΩ input network to deliver a fixed 50V/V gain. Unlike programmable amplifiers, no external gain resistors are needed-reducing BOM count, layout area, and matching errors in production.
How does the REF pin function in the LT1999HS8-50#TRPBF?
The REF pin sets the output common-mode level of the LT1999HS8-50#TRPBF. Internally biased to mid-supply (2.5V at 5V V+) via 160kΩ/160kΩ divider, it accepts external voltages from 1.125V to V+–1.125V. Driving REF allows output swing adjustment-for example, shifting from 0.5V–4.5V to 0V–3.3V to match a 3.3V ADC's input range without level-shifting circuitry.
What is the shutdown current specification for LT1999HS8-50#TRPBF at elevated temperature?
The LT1999HS8-50#TRPBF draws ≤25µA in shutdown mode at 150°C, as specified in the Electrical Characteristics table for MP-grade parts and confirmed for H-grade operation under worst-case conditions. This enables reliable low-power sleep mode in automotive ECUs exposed to under-hood thermal stress.
Is the LT1999HS8-50#TRPBF pin-compatible with other LT1999 variants?
Yes-the LT1999HS8-50#TRPBF uses the standard 8-lead SO (S8) package pinout shared across all LT1999-XX S8 variants (e.g., LT1999HS8-10#TRPBF, LT1999HS8-20#TRPBF). Pin functions (V+, +IN, –IN, GND, REF, OUT, SHDN) are identical; only gain and temperature grade differ. No PCB redesign is needed when upgrading between gain options in same package.
LT1999HS8-50#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.2 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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1999HS8-50#TRPBF FAQ
1.How can I place an order for LT1999HS8-50#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999HS8-50#TRPBF 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 LT1999HS8-50#TRPBF reliable?
The price and inventory of LT1999HS8-50#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999HS8-50#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1999HS8-50#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999HS8-50#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999HS8-50#TRPBF?
LT1999HS8-50#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999HS8-50#TRPBF 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 LT1999HS8-50#TRPBF?
For technical support, including LT1999HS8-50#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999HS8-50#TRPBF requirements.
6.How does Aetrix verify that LT1999HS8-50#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1999HS8-50#TRPBF 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 LT1999HS8-50#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1999HS8-50#TRPBF?
All LT1999HS8-50#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999HS8-50#TRPBF, 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 LT1999HS8-50#TRPBF part is unused and in its original packaging.
Return procedure for LT1999HS8-50#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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