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International Test Instruments Corporation IR3720MTRPBF
- Part No.:
- IR3720MTRPBF
- Manufacturer:
- International Test Instruments Corporation
- Category:
- Power Supply Controllers, Monitors
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
IR3720MTRPBF.pdf
- Description:
- POWER MONITOR IC W/DIGITAL I2C I
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
IR3720MTRPBF from Infineon Technologies is a digital power monitor IC that measures true average output power in synchronous buck and multiphase DC-DC converters via I²C/SMBus interface. It supports resistive or inductor DCR current sensing, delivers ±3.3% system power accuracy, operates from 3.3 V supply, and reports real-time voltage, current, and power over user-programmable averaging intervals (0.9–282 ms) in a 10-pin 3×3 mm DFN package.
For engineers reviewing the IR3720MTRPBF datasheet, IR3720MTRPBF pinout, IR3720MTRPBF application, or IR3720MTRPBF equivalent, key selection criteria include TruePower™ measurement fidelity, DCR-based current sensing compatibility, I²C address configurability (three options), 512 kHz internal sampling rate, and thermal performance with θJC = 53°C/W in low-profile DFN packaging.
Technical Context
The IR3720 implements a proprietary analog multiplier architecture to compute instantaneous Vo × IL, digitizes the product at up to 512 kHz using an internal ADC, and applies programmable time-domain averaging before reporting 16-bit hex values via I²C. Its VCS pin maintains Kelvin-sensed current path alignment with VO through switched-current source feedback.
It integrates a precision 1.5 V internal reference (±0.1 V tolerance), supports external clock input (922–1126 kHz) or internal oscillator, and provides dual-mode ALERT# signaling-data-ready flag or over-limit interrupt-with open-drain output clamped to VDD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Power Accuracy | ±3.3% typical system-level error under defined test conditions; enables accurate load power budgeting in server VRMs. |
| Sampling Frequency | 512 kHz internal clock; ensures resolution of fast transient load steps in modern CPU/GPU power delivery. |
| Averaging Interval Range | 0.9–282 ms programmable via Config Register [d3..d0]; balances noise rejection vs. response latency for dynamic loads. |
| Voltage Input Range | 0.5–1.8 V full-scale on VO pin; matches standard low-voltage output rails of point-of-load converters. |
| Current Sensing Method | Supports both discrete shunt (RCS2) and inductor DCR sensing; eliminates need for separate current-sense resistor in compact designs. |
| I²C Address Options | Three fixed addresses (0xE0, 0xE4, 0xEC) set by ADDR pin state; allows multiple IR3720 devices on same bus without address conflict. |
| Thermal Resistance θJC | 53°C/W junction-to-case; enables reliable operation up to 125°C junction temperature with minimal heatsinking. |
Pinout & Package
IR3720MTRPBF uses a RoHS-compliant, lead-free 10-pin DFN package (3 mm × 3 mm body, 0.5 mm pitch), with exposed thermal pad connected internally to GND (Pin 4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCS | Analog current sense input | Kelvin-connected to inductor DCR or shunt; internal switched-current source forces average VVCS = VVO for accurate multiplication. |
| VO | Analog voltage sense input | Measures output rail voltage; must be Kelvin-connected to inductor output node to avoid sensing errors from PCB trace resistance. |
| VREF | Reference current sink | Connects to GND via RT (25.5 kΩ typical); sets current gain scale and enables DCR temperature compensation network. |
| GND | Signal and bias ground | Common return for VDD, VO, VCS, and VREF; also thermal pad connection point for heat dissipation. |
| VDD | 3.3 V bias supply | Requires local 100 nF ceramic bypass capacitor; operating range 3.1–3.9 V; shutdown current <100 μA when enabled. |
| EXTCLK | Digital clock input | Optional external clock input (922–1126 kHz); if unused, must be tied to GND to enable internal oscillator. |
| ADDR | I²C address select | Configures slave address: low = 0xE0, open = 0xE4, high = 0xEC; no pull-up/down required beyond configuration. |
| SCL | I²C clock input | Slave-only interface; supports standard-mode (100 kHz) and fast-mode (400 kHz) I²C timing per JEDEC spec. |
| SDA | I²C bidirectional data | Open-drain I/O; requires external pull-up; handles read/write transactions including output register access and config register writes. |
| ALERT# | Programmable open-drain output | Asserts low on new data ready or configurable over-limit condition; released after register read; clamped to VDD. |
Key Features
| Feature | Design Value |
|---|---|
| TruePower™ measurement | Real-time analog multiplication of VO and IL followed by digital averaging-enables accurate power reporting under highly dynamic loads without software correction. |
| Flexible current sensing | Hardware support for both discrete shunt resistors and inductor DCR sensing-reduces BOM count and PCB area in space-constrained VRMs. |
| Configurable averaging interval | Eight selectable intervals (0.9–282 ms) via 4-bit register-allows trade-off between measurement noise suppression and transient response speed. |
| Multi-device I²C addressing | Three hardware-selectable addresses-enables concurrent monitoring of multiple phases or rails on a single I²C bus without address collision. |
| Integrated reference and gain control | 1.5 V internal reference with external RT resistor network-supports DCR temperature coefficient cancellation for stable current measurement across temperature. |
Applications
| Server VRM Power Monitoring | GPU Voltage Regulator Telemetry |
|---|---|
Use Scenario: Real-time power telemetry in 12-phase server VRMs delivering 1.0–1.8 V to Xeon processors. IC Role / Device Role / Timing Role: Measures per-phase or aggregate output power via DCR sensing; reports averaged values every 8 ms over I²C to BMC. Use Value: Enables dynamic power capping and thermal management with ±3.3% accuracy-critical for ASHRAE-compliant data center cooling. | Use Scenario: Power monitoring in high-current GPU VRMs where space prohibits discrete shunt resistors. IC Role / Device Role / Timing Role: Senses inductor DCR voltage drop and output rail voltage; computes true power using internal analog multiplier and 512 kHz sampling. Use Value: Eliminates shunt resistor losses and PCB routing complexity while maintaining sub-4% system power error across -10°C to 125°C. |
| Multiphase CPU Core Power Tracking | Industrial FPGA Power Integrity Verification |
Use Scenario: Per-rail power tracking in dual-core CPU VRMs with independent 1.2 V and 0.9 V domains. IC Role / Device Role / Timing Role: Monitors each rail using dedicated IR3720 device; leverages ADDR pin to assign unique I²C addresses for simultaneous polling. Use Value: Provides independent, time-aligned power data streams enabling precise core-level power gating decisions in real time. | Use Scenario: Verifying steady-state and transient power delivery integrity in Xilinx Kintex Ultrascale+ FPGA power systems. IC Role / Device Role / Timing Role: Interfaces with FPGA's I²C controller to log power during configuration, boot, and high-LUT utilization states. Use Value: Delivers calibrated 16-bit hex power values (e.g., 0x0A00 @ 0.5 V/20 mV DCR) for correlation with simulation models and compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX34417ETL+ | Higher power accuracy (±0.75%), integrated 12-bit ADC, but no DCR sensing support; requires external shunt only. | Lacks DCR-based current sensing-unsuitable for inductor-integrated current measurement in compact VRMs. | Select when absolute accuracy > flexibility; avoid when DCR sensing is required to minimize component count. |
| TI INA226AIDGST | Wide input voltage range (0–36 V), 16-bit delta-sigma ADC, but no built-in voltage × current multiplier; requires external computation. | Measures only current or voltage separately-power calculation must be performed externally, increasing host MCU overhead. | Select for high-side current sensing in non-buck topologies; avoid when true real-time power computation is needed on-chip. |
Compared with MAX34417ETL+ and INA226AIDGST, the IR3720MTRPBF uniquely integrates analog multiplication, DCR sensing, and I²C reporting in one 3×3 mm DFN-delivering true power telemetry with minimal host intervention and no external computation.
Availability
IR3720MTRPBF is available at Aetrix Electronics and suitable for server VRM telemetry, GPU power monitoring, multiphase CPU core tracking, and industrial FPGA power integrity verification requiring stable component supply and long-term lifecycle support.
Supply support for IR3720MTRPBF 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 global semiconductor leader specializing in power management, automotive, and industrial control solutions, with headquarters in Munich, Germany.
The IR3720 belongs to Infineon's TruePower™ digital power monitor product line, designed specifically for accurate, real-time power telemetry in high-efficiency, multi-phase DC-DC converters used in computing and communications infrastructure.
FAQ
What is the minimum averaging interval supported by the IR3720MTRPBF?
The IR3720MTRPBF supports a minimum averaging interval of 0.9 ms when Config Register bits [d3..d0] are set to b'0000. This setting enables fastest response to load transients while retaining sufficient noise rejection for stable power reporting in high-frequency VRMs.
Can the IR3720MTRPBF measure power in non-synchronous buck converters?
No-the IR3720MTRPBF is specifically optimized for synchronous rectified buck and multiphase converters. Its VCS pin relies on continuous inductor current flow and Kelvin connection to the synchronous switch node; it does not support discontinuous conduction mode or diode-rectified topologies.
How is DCR temperature compensation implemented on the IR3720MTRPBF?
DCR temperature compensation is implemented by connecting a thermistor-based network between VREF and GND, with RT (25.5 kΩ nominal) forming part of a voltage divider. The IR3720 monitors VREF current to adjust its internal current gain, counteracting the positive temperature coefficient of copper DCR.
Does the IR3720MTRPBF require external calibration for power accuracy?
No external calibration is required. The ±3.3% system power accuracy is achieved using factory-trimmed internal references and matched analog circuitry. Accuracy is guaranteed under specified conditions (VO = 1 V, VDCR = 20 mV, TJ = 0–85°C) without user calibration.
IR3720MTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- International Test Instruments Corporation
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Power Supply Monitor
- Voltage - Input:
- -
- Voltage - Supply:
- 3.135V ~ 3.465V
- Current - Supply:
- 480 µA
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
IR3720MTRPBF FAQ
1.How can I place an order for IR3720MTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3720MTRPBF 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 IR3720MTRPBF reliable?
The price and inventory of IR3720MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3720MTRPBF is usually 5 days.
3.What payment methods are accepted for IR3720MTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3720MTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3720MTRPBF?
IR3720MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3720MTRPBF 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 IR3720MTRPBF?
For technical support, including IR3720MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3720MTRPBF requirements.
6.How does Aetrix verify that IR3720MTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3720MTRPBF 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 IR3720MTRPBF meets industry standards.
7.What is the process for return or replacement of IR3720MTRPBF?
All IR3720MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3720MTRPBF, 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 IR3720MTRPBF part is unused and in its original packaging.
Return procedure for IR3720MTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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