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Infineon Technologies IR3725MTRPBF
- Part No.:
- IR3725MTRPBF
- Manufacturer:
- Infineon Technologies
- Category:
- Power Supply Controllers, Monitors
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
IR3725MTRPBF.pdf
- Description:
- IC PWR MONITOR INPUT 12-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,934
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Product details
Overview
IR3725MTRPBF from Infineon Technologies is a digital input power monitor IC designed for real-time measurement of voltage, current, and true average power on 12V rails in synchronous buck and multiphase converters. It delivers ±1.5% power error, ±1.0% current error, and supports SMBus/I²C interface with programmable averaging intervals from 0.85 ms to 295 ms.
For engineers reviewing the IR3725MTRPBF datasheet, IR3725MTRPBF pinout, IR3725MTRPBF application, or IR3725MTRPBF equivalent, this device serves as a precision telemetry sensor for dynamic load monitoring in server VRMs, telecom power supplies, and high-efficiency DC-DC systems where accurate power budgeting and thermal management are critical.
Technical Context
The IR3725 implements a proprietary analog front-end with dual current-sense inputs (VCS1/VCS2) that null differential voltage across DCR or shunt elements, enabling precise current derivation independent of temperature drift. Its internal multiplier computes instantaneous VO × IL before digitization and time-averaging.
It features a configurable 8-bit averaging interval register (d3–d0), selectable external clock input (EXTCLK), and thermistor-based temperature compensation via VT pin. All measurements are reported as 8-bit signed integers over I²C/SMBus at up to 400 kHz clock rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Power Error | ±1.5 % max at TJ = 0–85°C; enables accurate power budgeting for dynamic CPU/GPU loads |
| Current Error | ±1.0 % max at TJ = 0–85°C; supports tight current-loop feedback in multiphase controllers |
| Averaging Interval | 0.85–295 ms user-programmable; matches transient response requirements of VRMs and POL converters |
| Voltage Input Range | 8–23.5 V full-scale; covers 12V rail with margin for ripple and overshoot |
| Digital Interface | SMBus/I²C compatible, 10 kHz–400 kHz; integrates directly with system management controllers without protocol translation |
| Thermal Compensation | VT pin supports RT network for DCR temperature coefficient cancellation; maintains accuracy across -10°C to 125°C junction range |
| Supply Voltage | VDD = 3.3 V ±5%; low-noise bias for analog sensing, decoupled via ceramic capacitor to GND |
Pinout & Package
IR3725MTRPBF is housed in a 12-pin, 4 mm × 3 mm, 0.5 mm pitch DFN package with exposed thermal pad (θJC = 1.6 °C/W). RoHS-compliant and MSL Level 2 reflow rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCS1 | Analog current sense input | One side of differential DCR/shunt sensing node; internal nulling circuit balances VCS1–VCS2 voltage |
| VCS2 | Analog current sense input | Second side of differential sensing node; combined with VCS1 determines IL magnitude and direction |
| VO | Analog voltage sense input | Monitors rail voltage referenced to GND; used with current data to compute TruePower™ |
| VT | Thermistor compensation input | Connects to RT network for DCR temperature coefficient cancellation; sets internal current source amplitude |
| GND | Signal and bias ground | Reference for VO, sink for RT bias current, and return path for internal analog circuits |
| VDD | 3.3 V bias supply | Powers internal logic and analog blocks; requires local 0.1 µF ceramic bypass to GND |
| EXTCLK | Digital clock input | Schmitt-triggered external clock input (40–60% duty); optional override of internal 512 kHz oscillator |
| ADDR | I²C address select | Configures slave address (b'1110000 / b'1110010 / b'1110110) via pull-down/floating/pull-up |
| SCL | I²C clock input | Slave-only clock input; supports standard-mode (100 kHz) and fast-mode (400 kHz) timing |
| SDA | I²C bidirectional data | Open-drain data line; driven by IR3725 during read transactions, monitored during write |
| ALERT# | Programmable open-drain output | Asserts low on new data ready or configurable over-limit condition; pulled high via external resistor |
| NC | No connect | Pin 12 is unconnected internally; must remain floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| TruePower™ computation | Real-time VO × IL multiplication followed by user-defined time averaging-enables accurate power reporting under fast load transients |
| Flexible current sensing | Supports DCR, shunt resistor, or copper trace sensing; eliminates need for dedicated current-sense amplifiers |
| Thermal drift compensation | VT/RT network actively cancels inductor DCR temperature coefficient-maintains <±1.5% current accuracy across operating range |
| Configurable alert function | ALERT# pin programmable as data-ready flag or over-power/over-current interrupt-reduces polling overhead in system firmware |
| Low quiescent current | 700–1000 µA typical VDD supply current-minimizes impact on monitored rail efficiency |
Applications
| Server VRM Telemetry | Telecom DC-DC Monitoring |
|---|---|
|
Use Scenario: Real-time power tracking of CPU/GPU voltage rails in 1U/2U rack servers with dynamic workloads. IC Role / Device Role / Timing Role: Input power monitor measuring VO, IL, and average power at 1–10 ms intervals for PMBus-based thermal throttling. Use Value: Enables accurate per-rail power capping and predictive thermal management without adding external ADCs or multi-chip solutions. |
Use Scenario: Monitoring +12V intermediate bus in 48V-to-12V telecom rectifiers with strict efficiency and reliability requirements. IC Role / Device Role / Timing Role: High-accuracy current and voltage sensor feeding telemetry to system controller for fault logging and derating. Use Value: Delivers ±1.5% power error across temperature-critical for compliance with NEBS GR-63-CORE thermal safety margins. |
| Multiphase Buck Controller Companion | Industrial PLC Power Management |
|
Use Scenario: Integration with multi-phase PWM controllers (e.g., ISL63xx, IR35xx) to provide per-phase or total rail power data. IC Role / Device Role / Timing Role: Slave device on shared SMBus, reporting synchronized power samples aligned with phase interleaving timing. Use Value: Supports phase balancing and current sharing validation through correlated voltage/current/power timestamps. |
Use Scenario: Power health monitoring in DIN-rail mounted PLC power supplies operating in harsh industrial environments (-40°C to +85°C ambient). IC Role / Device Role / Timing Role: Robust analog front-end with DCR sensing and VT-based thermal compensation ensures stable readings despite wide temperature swings. Use Value: Eliminates need for isolated current sensors while maintaining ±1.0% current accuracy-reducing BOM cost and board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar input power monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX34412ETL+ | Integrated 12-bit ADC, fixed 100 ms averaging, no DCR temperature compensation | Limited to shunt-based sensing; lacks VT-driven thermal correction for inductor DCR | Prefer when shunt sensing is mandated and thermal drift is negligible |
| TI INA226 | Current/voltage monitor only-no power computation or averaging engine; requires host MCU for multiplication | Needs external firmware to calculate power and implement averaging-increases system latency and complexity | Choose when flexibility in algorithm selection outweighs integrated TruePower™ simplicity |
Compared with MAX34412ETL+ and INA226, IR3725MTRPBF uniquely embeds hardware-based VO×IL multiplication, programmable time-averaging, and DCR thermal compensation-reducing host processing load and improving accuracy in thermally variable inductor-based designs.
Availability
IR3725MTRPBF is available at Aetrix Electronics and suitable for server VRMs, telecom DC-DC converters, and industrial PLC power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for IR3725MTRPBF 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
Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with global manufacturing and quality certification to ISO 9001 and IATF 16949.
The IR3725 belongs to Infineon's Power Monitoring IC product line, engineered specifically for high-accuracy, real-time telemetry in high-efficiency DC-DC conversion systems where DCR sensing and thermal stability are essential.
FAQ
What current sensing methods does the IR3725MTRPBF support?
The IR3725MTRPBF supports three current sensing topologies: discrete shunt resistors, inductor DCR, and PCB copper trace resistance. It uses a differential nulling architecture across VCS1/VCS2 to reject common-mode noise and enable direct DCR measurement without additional op-amps or gain stages.
How is temperature compensation implemented for DCR sensing?
Temperature compensation is implemented via the VT pin, which connects to an external precision resistor network (RT) configured to cancel the positive temperature coefficient of the inductor's DCR. The internal circuitry monitors VT current to adjust the current-sense gain dynamically across –10°C to 125°C junction temperature.
Can the IR3725MTRPBF operate without an external clock?
Yes-the IR3725MTRPBF uses an internal 512 kHz oscillator by default. EXTCLK is optional: if left unconnected or tied to GND, the internal clock is automatically selected. An external clock (922–1126 kHz, 40–60% duty) may be applied only when tighter timing synchronization with other system clocks is required.
What is the function of the ALERT# pin beyond data-ready signaling?
ALERT# is programmable as either a data-ready flag (pulled low when new measurement data is available) or a configurable over-limit alarm (e.g., triggered when power exceeds a user-defined threshold). Its open-drain structure allows wired-OR connection with other system interrupts and compatibility with 3.3 V logic levels.
IR3725MTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- TruePower™
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Applications:
- Power Supply Monitor
- Voltage - Input:
- -
- Voltage - Supply:
- 3.135V ~ 3.465V
- Current - Supply:
- 700 µA
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
IR3725MTRPBF FAQ
1.How can I place an order for IR3725MTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3725MTRPBF 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 IR3725MTRPBF reliable?
The price and inventory of IR3725MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3725MTRPBF is usually 5 days.
3.What payment methods are accepted for IR3725MTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3725MTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3725MTRPBF?
IR3725MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3725MTRPBF 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 IR3725MTRPBF?
For technical support, including IR3725MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3725MTRPBF requirements.
6.How does Aetrix verify that IR3725MTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3725MTRPBF 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 IR3725MTRPBF meets industry standards.
7.What is the process for return or replacement of IR3725MTRPBF?
All IR3725MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3725MTRPBF, 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 IR3725MTRPBF part is unused and in its original packaging.
Return procedure for IR3725MTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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