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Analog Devices Inc. LTC4151CMS#PBF
- Part No.:
- LTC4151CMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC4151CMS#PBF.pdf
- Description:
- IC CURRENT MONITOR(12BIT) 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,085
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Product details
Overview
LTC4151CMS#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 high-side current (via SENSE+/- differential input, full-scale 81.92 mV), input voltage (VIN, full-scale 102.4 V), and external analog voltage (ADIN, full-scale 2.048 V), all reported via I²C interface. Designed for telecom infrastructure monitoring, it supports continuous scan mode (7.5 Hz update rate) and on-demand snapshot mode.
For engineers reviewing the LTC4151CMS#PBF datasheet, LTC4151CMS#PBF pinout, LTC4151CMS#PBF application, or LTC4151CMS#PBF equivalent, key selection criteria include its 10-lead MSOP package, 0°C to 70°C temperature grade, SHDN pin for 120 µA shutdown current, and compatibility with standard I²C bus timing (400 kHz max).
Technical Context
The LTC4151CMS#PBF implements a ΔΣ ADC architecture that inherently averages noise during conversion, enabling stable high-side current sensing in noisy industrial and telecom environments. Its internal reference is fixed at 2.048 V, and the ADC sequentially samples three channels: (SENSE+ − SENSE−), VIN, and ADIN - each with dedicated full-scale ranges and LSB resolutions (20 µV, 25 mV, 0.5 mV respectively).
It features configurable I²C addressing via ADR0/ADR1 pins (nine possible addresses), supports SMBus Read/Write Byte/Word/Page commands, and includes a stuck-bus reset timer (33 ms timeout). Unlike LTC4151-1/-2 variants, the LTC4151CMS#PBF uses a single bidirectional SDA pin and includes a dedicated SHDN pin - no split SDAI/SDAO or inversion logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 7 V to 80 V - enables direct monitoring of 48 V telecom rails and industrial 24–72 V systems without external level-shifting. |
| Current Sense Full-Scale | 81.92 mV - supports accurate high-side current measurement with typical 0.02 Ω sense resistor (4.096 A full-scale). |
| VIN Measurement Range | 0–102.4 V - covers full 7–80 V operating range with 25 mV LSB resolution for precise input rail tracking. |
| ADIN Input Range | 0–2.048 V - allows monitoring of auxiliary voltages (e.g., battery, sensor outputs) with 0.5 mV LSB resolution. |
| I²C Clock Frequency | Up to 400 kHz - compatible with standard Fast-mode I²C controllers without requiring custom timing adjustments. |
| Shutdown Current | 120 µA - reduces system standby power when high-side monitoring is temporarily disabled. |
| Operating Temperature | 0°C to 70°C - suitable for commercial-grade telecom line cards and industrial control panels with ambient thermal management. |
Pinout & Package
Package: 10-Lead Plastic MSOP (MS package), 3 mm × 3 mm footprint, exposed pad optional for thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SENSE− | High-side current sense input | Differential input referenced to SENSE+; connects to low side of external sense resistor. |
| 2 GND | Device ground | Analog/digital reference node; must be connected to system ground plane with low impedance. |
| 3 SHDN | Shutdown control input | Pulled up internally to 6.3 V; drive below 1 V to enter 120 µA shutdown mode. |
| 4 SDA | I²C bidirectional data line | Open-drain output/input; requires external pull-up to VIN (not VDD) due to internal 6 V clamp. |
| 5 SCL | I²C clock input | Open-collector input; driven by master; requires external pull-up to VIN with internal 6 V clamp. |
| 6 SENSE+ | Kelvin sense of VIN | Must connect directly to VIN pin (not PCB trace) to eliminate IR drop error in current measurement. |
| 7 VIN | Power supply and voltage sense input | Accepts 7–80 V; supplies internal circuitry and provides full-scale 102.4 V input for ADC. |
| 8 ADR1 | I²C address configuration | Three-state input (VIN/GND/open) to select one of nine I²C addresses per Table 1. |
| 9 ADR0 | I²C address configuration | Three-state input (VIN/GND/open); used with ADR1 to configure device address bits a1/a0. |
| 10 ADIN | External analog voltage input | Monitors 0–2.048 V signals; tied to GND if unused; 2 MΩ input resistance minimizes loading. |
Key Features
| Feature | Design Value |
|---|---|
| ΔΣ ADC architecture | Provides inherent noise averaging for stable current/voltage readings in electrically noisy 48 V telecom environments. |
| Three-channel sequential sampling | Automatically cycles through SENSE, VIN, and ADIN every ~133 ms (7.5 Hz), eliminating need for host polling coordination. |
| Snapshot mode with channel selection | Enables on-demand single-shot measurement of any one channel (SENSE/VIN/ADIN) via I²C register write, reducing bus traffic. |
| Dedicated SHDN pin | Reduces quiescent current to 120 µA without altering I²C address or register state - ideal for power-gated subsystems. |
| Internal 2.048 V reference | Stabilizes ADC accuracy across temperature and supply variations; eliminates need for external reference component. |
Applications
| Telecom Power Monitoring | Industrial 48 V DC Distribution |
|---|---|
Use Scenario: Real-time monitoring of +48 V primary power feed in central office line cards and remote radio units. IC Role / Device Role / Timing Role: High-side current and input voltage sensor feeding telemetry data to system controller via I²C. Use Value: Detects open-circuit faults, load surges, and brownouts using 81.92 mV full-scale current sense and 102.4 V VIN range - no external signal conditioning required. | Use Scenario: Supervision of 48 V DC power buses in programmable logic controller (PLC) backplanes and motor drive power stages. IC Role / Device Role / Timing Role: Standalone high-side monitor reporting current draw and rail stability to safety-critical watchdog circuitry. Use Value: 7–80 V operating range accommodates wide input tolerance; 12-bit resolution enables detection of <1% load changes on 10 A rails. |
| Automotive 24 V Battery Management | Consumer Equipment Power Telemetry |
Use Scenario: Monitoring starter battery health and alternator output in commercial vehicle telematics modules. IC Role / Device Role / Timing Role: High-side current sensor interfacing with microcontroller over I²C to log charge/discharge cycles. Use Value: 120 µA shutdown current extends battery life during vehicle sleep mode; Kelvin SENSE+ connection ensures accuracy despite chassis ground noise. | Use Scenario: Power usage analytics in smart UPS units and PoE-powered network switches. IC Role / Device Role / Timing Role: Dual-role monitor measuring both input rail voltage and auxiliary 3.3 V/5 V regulator outputs via ADIN pin. Use Value: Single-chip solution replaces discrete op-amp + ADC combinations; 0.5 mV LSB on ADIN enables ±0.1% accuracy on 2.048 V reference measurements. |
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 | 36 V max supply; 16-bit delta-sigma ADC; no SHDN pin; supports alert pin and shunt/Bus voltage averaging modes. | Better resolution but limited to ≤36 V systems; lacks dedicated shutdown control and 48 V telecom compatibility. | Select for precision low-voltage (<36 V) battery monitoring where 16-bit resolution outweighs voltage range needs. |
| LTC4151IMS#PBF | Identical functionality and pinout; rated for –40°C to 85°C industrial temperature range. | Same electrical performance; differs only in extended temperature qualification and part marking (IMS vs CMS). | Select when operating in uncontrolled ambient environments (e.g., outdoor cabinets, engine bays) requiring wider thermal margin. |
Compared with INA226AIDGST, LTC4151CMS#PBF delivers 80 V headroom essential for telecom and industrial 48 V systems, while LTC4151IMS#PBF offers identical monitoring capability with guaranteed operation down to –40°C - making the CMS variant optimal for cost-sensitive commercial deployments within 0°C–70°C envelopes.
Availability
LTC4151CMS#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial 48 V DC distribution, and automotive battery telemetry requiring stable component supply and long-term production continuity.
Supply support for LTC4151CMS#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 power management semiconductors.
The LTC4151 product line was designed specifically for robust, wide-range high-side power monitoring in telecom, industrial, and automotive systems - emphasizing simplicity, accuracy, and I²C interoperability without external support components.
FAQ
What is the maximum input voltage the LTC4151CMS#PBF can monitor?
The LTC4151CMS#PBF monitors input voltage (VIN) with a full-scale range of 0–102.4 V and an absolute maximum rating of 90 V. Its specified operating range is 7 V to 80 V, making it suitable for 48 V telecom systems and industrial 24–72 V rails. Exceeding 80 V may compromise accuracy, and operation above 90 V risks permanent damage per Absolute Maximum Ratings.
Does the LTC4151CMS#PBF support opto-isolation on its I²C interface?
No, the LTC4151CMS#PBF does not support opto-isolation. It uses a single bidirectional SDA pin. Opto-isolation capability is exclusive to the LTC4151-1 and LTC4151-2 variants, which feature split SDAI (input) and SDAO (output) pins. The LTC4151CMS#PBF is intended for same-ground I²C communication; adding external isolation requires external level-shifting or isolator ICs.
How does the SHDN pin function on the LTC4151CMS#PBF?
The SHDN pin on the LTC4151CMS#PBF is internally pulled up to 6.3 V. Driving it below 1 V (typical threshold 1.5 V max) places the device into shutdown mode, reducing quiescent current to 120 µA. Leaving SHDN open maintains normal operation. This pin is absent on LTC4151-1/-2 variants, which rely on I²C command-based power control instead.
What is the resolution and full-scale range for current sensing on the LTC4151CMS#PBF?
The LTC4151CMS#PBF provides 12-bit resolution for current sensing with a full-scale differential input of 81.92 mV and an LSB step size of 20 µV. When used with a 0.02 Ω sense resistor, this yields a full-scale current of 4.096 A. The SENSE+ pin must be connected via Kelvin sense directly to the VIN pin to maintain accuracy and reject PCB trace resistance errors.
Can the LTC4151CMS#PBF measure an external voltage, and how is it configured?
Yes, the LTC4151CMS#PBF measures an external voltage via the ADIN pin, supporting a 0–2.048 V input range with 12-bit resolution and 0.5 mV LSB. To use it, apply the external signal directly to ADIN and leave it unconnected (tied to GND) if unused. Input resistance is 2 MΩ, minimizing loading; input current is ±2 µA at 3 V, ensuring minimal impact on source impedance.
LTC4151CMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC4151CMS#PBF FAQ
1.How can I place an order for LTC4151CMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4151CMS#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 LTC4151CMS#PBF reliable?
The price and inventory of LTC4151CMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4151CMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC4151CMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4151CMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4151CMS#PBF?
LTC4151CMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4151CMS#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 LTC4151CMS#PBF?
For technical support, including LTC4151CMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4151CMS#PBF requirements.
6.How does Aetrix verify that LTC4151CMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4151CMS#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 LTC4151CMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC4151CMS#PBF?
All LTC4151CMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4151CMS#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 LTC4151CMS#PBF part is unused and in its original packaging.
Return procedure for LTC4151CMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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