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Analog Devices Inc. LTC4151IS-2#TRPBF
- Part No.:
- LTC4151IS-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC4151IS-2#TRPBF.pdf
- Description:
- IC CURRENT MONITOR(12BIT) 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,558
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Product details
Overview
LTC4151IS-2#TRPBF 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 high-side current (via SENSE+/-, full-scale 81.92mV), input voltage (VIN, full-scale 102.4V), and external voltage (ADIN, full-scale 2.048V), all reported via I²C. It is used in telecom power systems for real-time rail monitoring and fault detection.
For engineers reviewing the LTC4151IS-2#TRPBF datasheet, LTC4151IS-2#TRPBF pinout, LTC4151IS-2#TRPBF application, or LTC4151IS-2#TRPBF equivalent, key selection considerations include its –40°C to 85°C industrial temperature grade, 16-lead SO package with split SDAI/SDAO pins for opto-isolated I²C communication, and snapshot-mode on-demand measurement capability.
Technical Context
The LTC4151IS-2#TRPBF implements a ΔΣ ADC architecture that inherently averages noise during conversion, supporting continuous scan mode at 7.5Hz or single-shot snapshot mode triggered via I²C control register (G7). Its three-channel measurement sequence-(SENSE+–SENSE–), VIN, then ADIN-is fixed and internally timed.
Unlike the base LTC4151 or LTC4151-1, the LTC4151IS-2#TRPBF uses non-inverted SDAO output and is exclusively offered in the 16-lead SO package with NC pins at positions 3, 4, 6, 7, 9, 10, 11, and 13. Its ADR0/ADR1 pins configure one of nine I²C addresses, and it includes a stuck-bus reset timer (33ms timeout) enabled by default.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 7V to 80V - supports direct monitoring of telecom –48V rails and industrial 24V/48V systems without level-shifting. |
| ADC Resolution | 12-bit - delivers 4096 codes with no missing codes, enabling precise current sensing down to 20µV LSB (81.92mV full-scale). |
| VIN Measurement Range | 0V to 102.4V - covers full 7–80V operating range with 25mV LSB resolution for accurate rail voltage tracking. |
| ADIN Input Range | 0V to 2.048V - allows monitoring of auxiliary analog signals (e.g., battery voltage, temperature sensor output) with 0.5mV LSB. |
| I²C Interface | Standard-mode (400kHz max) - compatible with common microcontrollers; supports Read/Write Byte/Word/Page commands and mass-write addressing. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including base station power supplies and automotive body controllers. |
| Shutdown Current | ≤300µA - reduces system standby power when high-side monitoring is temporarily disabled via SHDN (not present on LTC4151-2 variants). |
Pinout & Package
Package: 16-lead plastic SO (Small Outline), 0.300" wide, with exposed thermal pad not applicable (SO package lacks exposed pad). Pin 1 is SENSE+, pin 16 is ADIN. Pins 3, 4, 6, 7, 9, 10, 11, and 13 are No Connect (NC) and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SENSE+) | Kelvin sense input for VIN | Must be connected directly to VIN pin with low-inductance trace to enable accurate high-side current sensing. |
| 2 (VIN) | High-voltage supply input | Accepts 7–80V; powers internal circuitry and serves as reference for VIN ADC channel (102.4V full-scale). |
| 5 (ADR1) | I²C address configuration | Three-state input (VIN/GND/open) selects one of nine device addresses; enables multi-drop bus operation. |
| 8 (ADR0) | I²C address configuration | Paired with ADR1 to set unique I²C slave address; both pins required for address decoding. |
| 12 (GND) | Device ground reference | Primary return path for internal ADC and logic; must connect to system power ground plane. |
| 14 (SDAI) | I²C data input | Open-collector input for host-to-device commands; pulled up to VIN (not VDD) due to internal 6V clamp. |
| 15 (SCL) | I²C clock input | Open-collector clock line; requires external pull-up to VIN; internally clamped to 6V min. |
| 16 (ADIN) | External analog input | Monitors 0–2.048V signals (e.g., thermistor divider); 12-bit result stored in registers E/F. |
Key Features
| Feature | Design Value |
|---|---|
| Split I²C data path (SDAI/SDAO) | Enables galvanic isolation using optocouplers without requiring separate low-voltage supply for pull-ups - SDAI and SCL pull-ups connect directly to VIN. |
| Non-inverted SDAO output | Provides standard logic polarity for opto-isolated SDA return path, simplifying interface design versus inverted-output LTC4151-1 variant. |
| Snapshot measurement mode | Allows on-demand, single-conversion reads of SENSE, VIN, or ADIN via I²C control register - eliminates continuous polling and reduces host CPU load. |
| Stuck-bus reset timer | Automatically recovers I²C communication after 33ms bus lockup (SCL or SDAI held low), improving system robustness in noisy industrial environments. |
| Configurable I²C addressing | Nine unique addresses via ADR0/ADR1 (VIN/GND/open) support up to nine LTC4151IS-2#TRPBF devices on same bus without address conflict. |
Applications
| Telecom Power Monitoring | Industrial DC Power Distribution |
|---|---|
Use Scenario: Real-time monitoring of –48V telecom rectifier output rails for overcurrent, undervoltage, and load anomaly detection. IC Role / Device Role / Timing Role: High-side current and voltage sensor feeding telemetry data to system management controller via isolated I²C. Use Value: Enables predictive maintenance and rapid fault isolation in carrier-grade power systems without adding external signal conditioning. | Use Scenario: Supervision of 24V/48V DC distribution panels in factory automation, where multiple loads require independent current tracking. IC Role / Device Role / Timing Role: Dedicated rail monitor per branch circuit, reporting via daisy-chained isolated I²C buses to central PLC. Use Value: Eliminates need for discrete shunt amplifiers and ADCs, reducing BOM count and PCB area while maintaining ±1% total unadjusted error. |
| Automotive Body Control Module | Energy-Efficient Server PSU Telemetry |
Use Scenario: Monitoring high-current circuits (e.g., HVAC blower, seat heaters) in 12V/24V vehicle electrical systems. IC Role / Device Role / Timing Role: High-side current sensor interfacing to microcontroller over opto-isolated I²C to meet automotive EMC requirements. Use Value: Provides accurate current measurement across –40°C to +85°C ambient, supporting ASIL-B functional safety diagnostics. | Use Scenario: Per-rail telemetry in 12V/54V intermediate bus architectures for AI server power supplies. IC Role / Device Role / Timing Role: High-voltage rail monitor reporting input voltage, output current, and auxiliary voltages (e.g., fan tach feedback) to PMBus host. Use Value: Delivers 12-bit precision at 7.5Hz update rate with <1.25% TUE, enabling dynamic power capping and efficiency optimization. |
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 |
|---|---|---|---|
| INA226AIDGST | 36V max supply, 16-bit delta-sigma ADC, no split I²C, no SDAI/SDAO; supports shunt voltage up to ±81.92mV but VIN monitoring requires external divider. | Best suited for low-voltage (<36V) systems where higher resolution is prioritized over high-voltage direct monitoring. | Select if operating below 36V and requiring finer current resolution (10µV LSB) without needing VIN or ADIN channels. |
| LTC4151IMS-2#TRPBF | Same core functionality and register map, but in 10-lead MSOP package; identical –40°C to +85°C rating and non-inverted SDAO; lacks NC pins and has different thermal resistance (θJA = 85°C/W). | Preferred for space-constrained designs where SO footprint is prohibitive; shares identical I²C behavior and timing. | Choose for compact layouts where 16-lead SO is too large; verify PCB thermal relief matches θJA requirement. |
Compared with INA226AIDGST, LTC4151IS-2#TRPBF supports direct 7–80V operation and integrated VIN/ADIN measurement, eliminating external dividers; compared with LTC4151IMS-2#TRPBF, it offers higher thermal mass and easier hand-soldering but requires more board area.
Availability
LTC4151IS-2#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial power distribution, and automotive body control applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4151IS-2#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC4151 product line was designed specifically for high-reliability, high-voltage power monitoring in telecom, industrial, and automotive systems - emphasizing robust I²C isolation, wide supply range, and integrated multi-channel sensing.
FAQ
What is the maximum input voltage the LTC4151IS-2#TRPBF can monitor directly?
The LTC4151IS-2#TRPBF monitors VIN directly over a 7V to 80V range, with an absolute maximum rating of 90V. Its internal voltage divider scales VIN to a 102.4V full-scale ADC input, delivering 25mV LSB resolution. This enables direct monitoring of –48V telecom rails (with appropriate biasing) and industrial 24V/48V/72V systems without external components.
Does the LTC4151IS-2#TRPBF have a shutdown pin like the base LTC4151?
No, the LTC4151IS-2#TRPBF does not include a SHDN pin. That function is exclusive to the base LTC4151 and LTC4151-1 variants. The LTC4151IS-2#TRPBF operates continuously in normal mode or enters low-power state only via I²C command (not hardware pin), and its quiescent current remains ~1.2–1.7mA across the 7–80V range.
How does the SDAO pin on the LTC4151IS-2#TRPBF differ from the SDAO on the LTC4151-1?
The SDAO pin on the LTC4151IS-2#TRPBF provides non-inverted logic output, whereas the LTC4151-1's SDAO is inverted. This means the LTC4151IS-2#TRPBF outputs standard I²C data polarity, simplifying integration with optocouplers that expect true-level signaling - no additional inverter stage is needed, unlike with the LTC4151-1.
Can the LTC4151IS-2#TRPBF measure current and voltage simultaneously?
No, the LTC4151IS-2#TRPBF performs sequential measurements: first (SENSE+–SENSE–), then VIN, then ADIN - in continuous scan mode at 7.5Hz. Snapshot mode allows on-demand measurement of only one channel per trigger. True simultaneous sampling is not supported; however, the 53–85ms conversion time per channel ensures minimal inter-channel timing skew for most power telemetry use cases.
What I²C addresses are supported by the LTC4151IS-2#TRPBF?
The LTC4151IS-2#TRPBF supports nine I²C addresses determined by ADR1 and ADR0 pin states (VIN, GND, or open), as defined in Table 1 of the datasheet. Valid addresses range from 0xD0 to 0xDE (hex), plus a mass-write address 0xCC. All addresses use standard 7-bit format with R/W bit appended, and are fully compatible with SMBus protocols.
LTC4151IS-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC4151IS-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4151IS-2#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 LTC4151IS-2#TRPBF reliable?
The price and inventory of LTC4151IS-2#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4151IS-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4151IS-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4151IS-2#TRPBF?
LTC4151IS-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4151IS-2#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 LTC4151IS-2#TRPBF?
For technical support, including LTC4151IS-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4151IS-2#TRPBF requirements.
6.How does Aetrix verify that LTC4151IS-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4151IS-2#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 LTC4151IS-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4151IS-2#TRPBF?
All LTC4151IS-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4151IS-2#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 LTC4151IS-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4151IS-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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