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Analog Devices Inc. LTC4151IS-2#PBF
- Part No.:
- LTC4151IS-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC4151IS-2#PBF.pdf
- Description:
- IC CURRENT MONITOR(12BIT) 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,483
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Product details
Overview
LTC4151IS-2#PBF from Analog Devices (formerly Linear Technology) is a high-side power monitor IC with integrated 12-bit ΔΣ ADC, operating from 7V to 80V input supply. It continuously measures differential sense voltage (full-scale 81.92 mV, 20 µV LSB), VIN (102.4 V FS, 25 mV LSB), and external ADIN voltage (2.048 V FS, 0.5 mV LSB) via I²C interface. Designed for isolated telecom power monitoring, it features split SDAI/SDAO pins (non-inverted SDAO) and operates across –40°C to +85°C.
For engineers reviewing the LTC4151IS-2#PBF datasheet, LTC4151IS-2#PBF pinout, LTC4151IS-2#PBF application, or LTC4151IS-2#PBF equivalent, key selection criteria include its 16-pin SO package, –40°C to +85°C industrial temperature grade, non-inverted opto-isolation-ready SDAO output, 7.5 Hz continuous conversion rate, and support for SMBus Read/Write Word and Page commands.
Technical Context
The LTC4151IS-2#PBF implements a ΔΣ ADC architecture that inherently averages noise during measurement, enabling stable current sensing at high common-mode voltages. Its internal 2.048 V reference sets full-scale ranges for all three channels: 81.92 mV (SENSE+–SENSE–), 102.4 V (VIN), and 2.048 V (ADIN).
Unlike the base LTC4151 or LTC4151-1, the LTC4151IS-2#PBF uses separate SDAI (input) and non-inverted SDAO (output) pins to simplify bidirectional opto-isolated I²C communication without level-shifting circuitry. Its control register (06h) supports snapshot mode, test mode, page command enable/disable, and stuck-bus timer configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 7 V to 80 V - enables direct monitoring of 48 V telecom, 24 V industrial, and automotive battery rails without external regulators |
| ADC Resolution | 12-bit - provides 4096 discrete steps for precise current/voltage quantization in real-time power telemetry |
| SENSE Full-Scale | 81.92 mV - supports high-accuracy shunt-based current sensing with 20 µV LSB for ≤4 A full-scale using 0.02 Ω resistor |
| VIN Full-Scale | 102.4 V - covers entire 7–80 V operating range with 25 mV LSB resolution for supply rail monitoring |
| ADIN Full-Scale | 2.048 V - allows auxiliary voltage monitoring (e.g., battery cell, sensor output) with 0.5 mV LSB precision |
| Conversion Rate | 7.5 Hz (continuous) - delivers updated telemetry every 133 ms for responsive system-level power management |
| I²C Interface | SMBus-compatible with SDAI/SDAO separation - enables galvanic isolation using single-supply optocouplers tied to VIN |
Pinout & Package
Package: 16-Lead Plastic SO (Small Outline). Thermal resistance θJA = 100°C/W; max junction temperature = 150°C. Exposed pad not present in SO package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SENSE+) | Kelvin sense of VIN | Must be connected directly to VIN pin to eliminate PCB trace resistance error in high-side current measurement |
| 2 (VIN) | High-voltage supply input | Primary power input (7–80 V); also used as pull-up source for SCL/SDAI/SDAO via external resistors |
| 3, 4, 5, 6, 7, 10, 11, 12 (NC) | No-connect | Not internally bonded; must remain unconnected per datasheet to avoid parasitic coupling or latch-up |
| 8 (ADR1) | I²C address bit 1 | Three-state input (VIN/GND/open) selects one of nine I²C addresses; enables multi-device bus configuration |
| 9 (ADR0) | I²C address bit 0 | Paired with ADR1 to configure device address; supports mass-write broadcast to all LTC4151 variants on same bus |
| 13 (SENSE–) | Current sense return | Connects to low side of external shunt resistor; differential input referenced to SENSE+ for 81.92 mV full-scale |
| 14 (GND) | Device ground | Analog/digital reference node; must be star-connected to minimize noise coupling into ADC inputs |
| 15 (SDAO) | I²C data output (non-inverted) | Open-drain output for SDA line in opto-isolated systems; logic-high pulled via resistor to VIN, eliminating need for separate 3.3 V supply |
| 16 (SDAI) | I²C data input | Open-collector input accepting master's SDA signal; clamped to 6 V max to protect against overvoltage transients |
| - (SCL) | I²C clock input | Shared clock line; open-collector with 6 V clamp; requires external pull-up to VIN for isolated operation |
| - (ADIN) | External analog input | Measures 0–2.048 V signals (e.g., temperature sensor output, battery cell voltage) with dedicated 12-bit ADC channel |
Key Features
| Feature | Design Value |
|---|---|
| Split SDAI/SDAO with non-inverted SDAO | Enables direct connection to high-side optocoupler anodes using VIN as pull-up source - eliminates isolated 3.3 V rail and reduces BOM count |
| ΔΣ ADC architecture | Provides inherent noise averaging and stable 12-bit measurements under noisy high-voltage switching environments (e.g., telecom DC/DC converters) |
| Snapshot mode via control register | Allows on-demand, single-shot measurement of any channel (SENSE/VIN/ADIN) without interrupting continuous polling - ideal for event-triggered diagnostics |
| Stuck-bus reset timer | Auto-resets I²C state machine after 33 ms SCL or SDAI/SDAO low condition - recovers communication after transient bus faults without host intervention |
| Configurable I²C addressing | Nine unique addresses via ADR0/ADR1 (VIN/GND/open) - supports up to nine LTC4151IS-2#PBF devices on one bus for multi-rail monitoring |
Applications
| Telecom Power Shelf Monitoring | Industrial 24 V DC Power Distribution |
|---|---|
Use Scenario: Real-time current and voltage telemetry in -48 V telecom rectifier shelves with optical isolation between control plane and high-voltage power plane. IC Role / Device Role / Timing Role: High-side current monitor and supply rail sensor with galvanically isolated I²C interface (SDAI/SDAO) for safe backplane communication. Use Value: Enables accurate load current reporting and overvoltage detection at 48 V without compromising safety isolation - critical for NEBS-compliant infrastructure. | Use Scenario: Monitoring input current and bus voltage in programmable logic controller (PLC) power modules operating from 24 V DC industrial supplies. IC Role / Device Role / Timing Role: Precision shunt-based current sensor and rail monitor feeding diagnostic data to microcontroller via isolated I²C. Use Value: Detects early-stage overload or short-circuit conditions with 20 µV LSB resolution, allowing predictive shutdown before fuse blow or component damage. |
| Automotive 12 V/24 V Battery Management | Server Rack PDUs |
Use Scenario: Measuring starter battery current and alternator output voltage in commercial vehicle ECUs where EMI immunity and wide temperature operation are essential. IC Role / Device Role / Timing Role: High-common-mode-voltage current/voltage monitor interfacing to CAN-connected MCU via opto-isolated I²C bridge. Use Value: Operates reliably from –40°C to +85°C and rejects high dV/dt noise typical of diesel engine cranking - ensures consistent telemetry during cold starts. | Use Scenario: Per-outlet current and voltage monitoring in intelligent power distribution units (PDUs) for data centers, with isolation between AC mains domain and Ethernet management domain. IC Role / Device Role / Timing Role: High-accuracy power telemetry sensor feeding real-time consumption data to ARM-based PDU controller via isolated I²C. Use Value: Supports energy metering compliance (IEC 62053-21) with ±1% total unadjusted error and 12-bit resolution across 100:1 dynamic range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current and voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4151IMS-2#PBF | Same functional spec, but in 10-lead MSOP package (θJA = 85°C/W vs SO's 100°C/W); rated –40°C to +85°C | Better thermal performance in space-constrained PCB layouts; lacks NC pins - simpler routing but no future pin expansion | Select when board area is limited and thermal margin above 100°C/W is required; verify SO-to-MSOP layout compatibility |
| INA226AIDGST | 36 V max supply (vs 80 V); 16-bit delta-sigma ADC; no ADIN channel; no SDAI/SDAO split; 10-lead VSSOP | Higher resolution but narrower voltage range; requires external level-shifting for isolation; optimized for low-voltage battery systems | Select for ≤36 V applications needing higher resolution and lower quiescent current (260 µA vs 1.2 mA); not suitable for telecom or industrial HV rails |
Compared with LTC4151IMS-2#PBF and INA226AIDGST, the LTC4151IS-2#PBF uniquely combines 80 V operation, non-inverted opto-isolation support, and 16-pin SO packaging - making it the only choice for ruggedized, isolated telecom and industrial power telemetry where board-level isolation and thermal robustness are mandatory.
Availability
LTC4151IS-2#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial power distribution, and automotive battery management requiring stable component supply across extended temperature ranges and high-reliability isolation schemes.
Supply support for LTC4151IS-2#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 LTC4151 product line was designed specifically for high-side power monitoring in harsh, high-voltage environments - targeting telecom, industrial, and automotive applications where accuracy, isolation, and wide supply range are non-negotiable.
FAQ
What is the maximum input voltage the LTC4151IS-2#PBF can monitor?
The LTC4151IS-2#PBF supports a VIN supply range of 7 V to 80 V, with absolute maximum rating of 90 V. Its onboard ADC measures VIN directly with a 102.4 V full-scale range and 25 mV LSB resolution, enabling accurate telemetry across the entire operating window without external scaling.
How does the SDAO pin on the LTC4151IS-2#PBF differ from the SDA pin on the standard LTC4151?
The LTC4151IS-2#PBF features separate SDAI (input) and non-inverted SDAO (output) pins, unlike the single bidirectional SDA on the base LTC4151. This split allows direct connection to optocoupler anodes using VIN as the pull-up source - eliminating the need for a separate low-voltage rail and simplifying isolated I²C implementation.
Can the LTC4151IS-2#PBF measure an external voltage in addition to current and supply voltage?
Yes. The LTC4151IS-2#PBF includes a dedicated ADIN pin that accepts 0 V to 2.048 V analog inputs. Its onboard ADC digitizes this signal with 12-bit resolution, 0.5 mV LSB, and ±1% total unadjusted error - enabling simultaneous monitoring of auxiliary signals like temperature sensor outputs or battery cell voltages.
What is the purpose of the ADR0 and ADR1 pins on the LTC4151IS-2#PBF?
The ADR0 and ADR1 pins configure the I²C slave address of the LTC4151IS-2#PBF. Each pin accepts VIN, GND, or open states, yielding nine unique addresses (0xC0–0xDE). This enables multiple LTC4151IS-2#PBF devices to coexist on the same I²C bus - essential for multi-rail power monitoring in complex systems.
Does the LTC4151IS-2#PBF support snapshot mode for on-demand measurements?
Yes. By setting bit G7 in the CONTROL register (06h) and selecting the target channel (SENSE/VIN/ADIN) via bits G6–G5, the LTC4151IS-2#PBF enters snapshot mode. It performs a single conversion and halts - freeing the host from continuous polling and reducing I²C bus traffic during event-triggered diagnostics.
LTC4151IS-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Power Supply Monitor
- Voltage - Input:
- 7V ~ 80V
- Voltage - Supply:
- 7V ~ 80V
- Current - Supply:
- 1.2 mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LTC4151IS-2#PBF FAQ
1.How can I place an order for LTC4151IS-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4151IS-2#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 LTC4151IS-2#PBF reliable?
The price and inventory of LTC4151IS-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4151IS-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC4151IS-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4151IS-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4151IS-2#PBF?
LTC4151IS-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4151IS-2#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 LTC4151IS-2#PBF?
For technical support, including LTC4151IS-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4151IS-2#PBF requirements.
6.How does Aetrix verify that LTC4151IS-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4151IS-2#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 LTC4151IS-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC4151IS-2#PBF?
All LTC4151IS-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4151IS-2#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 LTC4151IS-2#PBF part is unused and in its original packaging.
Return procedure for LTC4151IS-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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