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Analog Devices Inc. LTC3815IUFE#TRPBF
- Part No.:
- LTC3815IUFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3815IUFE#TRPBF.pdf
- Description:
- IC REG BUCK PROG 6A 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,998
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Product details
Overview
LTC3815IUFE#TRPBF from Analog Devices is a 6A monolithic synchronous step-down DC/DC converter with PMBus interface, operating from 2.25V to 5.5V input and delivering programmable output voltage from 0.4V to 72% of VIN. It features ±1% total output voltage accuracy over temperature, integrated 13-bit ADC for telemetry, and phase-lockable switching frequency up to 3MHz - deployed in FPGA/ASIC core power rails requiring precise margining and real-time monitoring.
For engineers reviewing the LTC3815IUFE#TRPBF datasheet, LTC3815IUFE#TRPBF pinout, LTC3815IUFE#TRPBF application, or LTC3815IUFE#TRPBF equivalent, key selection criteria include its PMBus-compliant voltage margining (±25%, 0.1% resolution), differential remote sensing capability, master shutdown mode (<1μA IQ), clock-out support for 2-phase operation, and thermally enhanced 38-lead 4mm × 6mm QFN package with exposed PGND pad.
Technical Context
The LTC3815IUFE#TRPBF employs a controlled-on-time, current-mode architecture with valley-current sensing via internal NMOS RDS(ON) (20mΩ typical) and PMOS RDS(ON) (35mΩ typical), enabling fast transient response and stable operation at low on-times required for sub-1V outputs at high frequencies. Its integrated 13-bit ADC supports time-averaged (~4ms) and peak readback of input/output voltage, current, and die temperature at 25Hz refresh rate.
System configuration and telemetry are managed through a PMBus 1.2–compliant interface (SCL/SDA/ALERT), supporting commands including MFR_VOUT_COMMAND (0.1%/bit margining), READ_VOUT (0.5mV/bit), READ_IOUT (10mA/bit), and STATUS_WORD fault reporting. The device supports both discontinuous and forced continuous conduction modes via MODE/SYNC pin control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - compatible with 2.5V, 3.3V, 5V rails and single-cell Li-ion batteries. |
| Output Current | 6A continuous - supported by integrated power MOSFETs with 35mΩ top / 20mΩ bottom RDS(ON). |
| Output Voltage Range | 0.4V to 72% of VIN - programmable via single resistor on REF pin or external reference. |
| Output Accuracy | ±1% over temperature at VIN = 3.3V or 5V - includes offset, line regulation, and reference current error contributions. |
| Switching Frequency | 400kHz to 3MHz - set by RT resistor or synchronized externally; enables noise-sensitive or high-density designs. |
| PMBus Interface | Compliant with PMBus 1.2 - supports VOUT margining, telemetry readback (V/I/T), fault status, and peak capture registers. |
| Margining Resolution | 0.1% per LSB - ±25% range via MFR_VOUT_COMMAND with slew-rate control via CSLEW capacitor. |
| Thermal Performance | θJA = 38°C/W - achieved via 4mm × 6mm QFN with soldered exposed PGND pad for PCB heat spreading. |
Pinout & Package
Package: 38-lead (4mm × 6mm) plastic QFN with exposed PGND pad (Pin 39), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (1) | Oscillator frequency programming | Resistor-to-ground sets fSW from 400kHz to 3MHz; tie to VIN for fixed 1MHz internal oscillator. |
| ASEL (2) | PMBus address LSB selection | ±1% resistor to ground selects 3 LSBs of SMBus address per Table 7 in datasheet. |
| MARGIN (3) | Fast margining trigger | Floating = serial command control; high = immediate ramp to MFR_VOUT_MARGIN_HIGH; low = immediate ramp to MFR_VOUT_MARGIN_LOW. |
| WP (4) | Write protection enable | High = disables writes to MFR_VOUT_COMMAND, MFR_VOUT_MARGIN_HIGH/LOW; grounded = full write access. |
| CLKOUT (6) | 2-phase synchronization output | 180° phase-shifted clock signal referenced to VIN; used to drive second phase in parallel configurations. |
| MODE/SYNC (9) | Mode selection & external sync input | Tied to VIN = DCM; grounded = forced CCM; driven externally = synchronizes fSW to applied clock. |
| VCC_SENSE / VSS_SENSE (32/31) | Differential output voltage sense | Enables Kelvin sensing at load; eliminates IR drop errors in high-current, low-VOUT applications. |
| PGOOD (29) | Power-good flag output | Open-drain; asserts after programmable delay (via PGFD) when VOUT enters ±10% default window (or custom via PGLIM). |
| RUN_MSTR (26) | Master enable input | Threshold = 1V rising; <0.4V forces full shutdown with IQ < 1μA - critical for system-level power sequencing. |
| REF (36) | Reference voltage input | 100μA internal current source times external resistor sets base VOUT; margining applied around this value. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 13-bit ADC telemetry | Reads time-averaged and peak VIN/VOUT/IIN/IOUT/temperature at 25Hz - eliminates need for external monitors in closed-loop systems. |
| Differential remote sensing | VCC_SENSE/VSS_SENSE pins enable true Kelvin connection - maintains ±1% regulation accuracy under PCB trace resistance up to 50mΩ. |
| Programmable PGOOD threshold | PGLIM pin allows custom over/undervoltage windows (e.g., ±6% or ±17%) - supports tight-tolerance ASIC/FPGA supply requirements. |
| Master shutdown mode | RUN_MSTR pin reduces supply current to <1μA - enables zero-power standby in battery-backed or always-on subsystems. |
| Phase-lockable clock output | CLKOUT provides 180°-shifted signal for seamless 2-phase interleaving - doubles effective output current to 12A without increasing ripple. |
| Fast margining with slew control | CSLEW pin accepts capacitor to set VOUT transition rate (0.1%/ms/nF); prevents overshoot during dynamic voltage scaling. |
Applications
| ASIC/FPGA Core Power | Intelligent Point-of-Load System |
|---|---|
Use Scenario: Powering 0.8V–1.2V cores in Xilinx Kintex or Intel Stratix FPGAs with dynamic voltage/frequency scaling (DVFS). IC Role / Device Role / Timing Role: Primary synchronous buck regulator with PMBus-controlled margining and real-time IOUT telemetry for adaptive power management. Use Value: Enables closed-loop DVFS using READ_IOUT and MFR_VOUT_COMMAND to reduce power by >15% during low-activity states while maintaining timing margins. | Use Scenario: Distributed 1.8V rail in telecom line card with hot-swap capability and fault logging. IC Role / Device Role / Timing Role: Standalone PoL converter with PGOOD sequencing, fault status reporting (STATUS_WORD), and peak current capture (MFR_IOUT_PEAK). Use Value: Eliminates need for external supervisors; built-in 25Hz telemetry and fault flags reduce BOM count and improve field-replaceability diagnostics. |
| Multi-Rail Server VRM | Battery-Powered Industrial Controller |
Use Scenario: Dual-rail 1.0V/1.8V supply for ARM-based SoC in edge AI inference module. IC Role / Device Role / Timing Role: Master-slave configured pair (using CLKOUT and VSS_SENSE tie) delivering 12A combined with interleaved ripple cancellation. Use Value: Reduces output capacitance requirement by 40% vs single-phase design; differential sensing ensures <±5mV regulation across 15cm PCB traces. | Use Scenario: 3.3V system rail powered from single-cell Li-ion (2.7V–4.2V) in portable HMI panel. IC Role / Device Role / Timing Role: Input-range-optimized buck with RUN_MSTR sequencing and <1μA shutdown current for battery preservation. Use Value: Extends battery life by >30% in sleep mode; VIN UVLO (2.05V) prevents brownout resets during deep discharge cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3880IUH#PBF | Two-channel, dual-output controller with identical PMBus feature set; requires external MOSFETs; higher channel count but no integrated power stage. | Suitable for multi-output systems needing independent rail control (e.g., DDR memory + core); not drop-in for single-rail 6A needs. | Select when designing ≥2 tightly regulated rails with coordinated sequencing - avoids duplicating LTC3815IUFE#TRPBF units. |
| TPS546D24RSAR | 6A integrated buck with PMBus 1.2, but lacks differential sensing, CLKOUT, and master shutdown; uses different ADC scaling (READ_VOUT = 1mV/bit vs 0.5mV/bit). | Valid for cost-sensitive industrial PoL where ±2% VOUT accuracy suffices and telemetry depth is secondary. | Choose for simpler, lower-cost deployments where remote sensing and ultra-low shutdown IQ are not required. |
Compared with LTC3880IUH#PBF and TPS546D24RSAR, the LTC3815IUFE#TRPBF uniquely combines single-chip 6A integration, differential Kelvin sensing, master shutdown <1μA, and CLKOUT for 2-phase expansion - making it optimal for space-constrained, high-accuracy, and thermally demanding single-rail applications.
Availability
LTC3815IUFE#TRPBF is available at Aetrix Electronics and suitable for FPGA/ASIC core power, intelligent point-of-load systems, and battery-powered industrial controllers requiring stable component supply, long-term lifecycle support, and guaranteed extended temperature operation.
Supply support for LTC3815IUFE#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets.
The LTC3815IUFE#TRPBF belongs to Analog Devices' Power by Linear™ family of digitally enhanced DC/DC controllers and regulators, designed specifically for high-efficiency, high-accuracy, and telemetry-rich power delivery in advanced computing and infrastructure systems.
FAQ
What is the maximum output voltage range supported by the LTC3815IUFE#TRPBF?
The LTC3815IUFE#TRPBF supports an output voltage range from 0.4V up to 72% of the input voltage (VIN). For example, with VIN = 5V, the maximum programmable VOUT is 3.6V. This range is set either by a single external resistor on the REF pin or by an external voltage reference, and can be dynamically adjusted ±25% via PMBus margining commands.
Does the LTC3815IUFE#TRPBF support differential remote voltage sensing?
Yes, the LTC3815IUFE#TRPBF supports true differential remote sensing using dedicated VCC_SENSE and VSS_SENSE pins. This configuration compensates for PCB trace IR drop, ensuring ±1% output voltage accuracy even with high current and long interconnects - a critical capability for low-voltage, high-current FPGA and ASIC core rails.
How does the PMBus interface of the LTC3815IUFE#TRPBF enable real-time telemetry?
The LTC3815IUFE#TRPBF's PMBus 1.2 interface supports register-based readback of time-averaged and peak values for input/output voltage, current, and die temperature - e.g., READ_VOUT (0.5mV/bit), READ_IOUT (10mA/bit), and READ_TEMPERATURE_1 (1°C/bit). All telemetry is refreshed at 25Hz, enabling closed-loop monitoring without external sensors or ADCs.
Can the LTC3815IUFE#TRPBF be used in a 2-phase interleaved configuration?
Yes, the LTC3815IUFE#TRPBF includes a dedicated CLKOUT pin that delivers a 180° phase-shifted clock signal synchronized to its internal switching node. When paired with a second LTC3815IUFE#TRPBF (configured as slave via VSS_SENSE tie), it enables seamless 2-phase interleaving - doubling output current capacity to 12A while reducing output ripple and EMI.
What is the shutdown current specification for the LTC3815IUFE#TRPBF, and how is it enabled?
The LTC3815IUFE#TRPBF achieves <1μA shutdown current when the RUN_MSTR pin is pulled below 0.4V. This master shutdown mode disables all internal circuitry except essential bias, making it ideal for battery-critical applications. In contrast, pulling RUN_STBY low reduces quiescent current to 120μA while keeping PMBus and ADC active for low-power telemetry.
LTC3815IUFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.4V
- Voltage - Output (Max):
- 3.96V
- Current - Output:
- 6A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (4x6)
LTC3815IUFE#TRPBF FAQ
1.How can I place an order for LTC3815IUFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3815IUFE#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 LTC3815IUFE#TRPBF reliable?
The price and inventory of LTC3815IUFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3815IUFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3815IUFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3815IUFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3815IUFE#TRPBF?
LTC3815IUFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3815IUFE#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 LTC3815IUFE#TRPBF?
For technical support, including LTC3815IUFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3815IUFE#TRPBF requirements.
6.How does Aetrix verify that LTC3815IUFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3815IUFE#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 LTC3815IUFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3815IUFE#TRPBF?
All LTC3815IUFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3815IUFE#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 LTC3815IUFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3815IUFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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