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Analog Devices Inc. LTC3889IUKG#TRPBF
- Part No.:
- LTC3889IUKG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 52-WFQFN, 46 Leads, Exposed Pad
- Datasheet:
-
LTC3889IUKG#TRPBF.pdf
- Description:
- IC REG BUCK PROG DL 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,865
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Product details
Overview
LTC3889IUKG#TRPBF from Analog Devices is a dual-output, 5V–60V input, PMBus/I²C-compatible synchronous step-down controller with integrated 16-bit ADC, 12-bit DAC, EEPROM with ECC, and high-side current sense amplifiers. It supports up to 6-phase PolyPhase® operation, programmable loop compensation, and independent power-good/FAULT signaling per channel - deployed in telecom rectifier modules requiring precise telemetry and digital margining.
For engineers reviewing the LTC3889IUKG#TRPBF datasheet, LTC3889IUKG#TRPBF pinout, LTC3889IUKG#TRPBF application, or LTC3889IUKG#TRPBF equivalent, key selection criteria include its ±0.5% output voltage accuracy over temperature, 45ns minimum on-time, 52-lead QFN package with exposed thermal pad, and support for both pulse-skipping and continuous conduction modes.
Technical Context
The LTC3889IUKG#TRPBF implements a constant-frequency, analog current-mode control architecture with two independent PWM channels, each featuring dedicated ITH and ITHR pins for slope compensation and peak-current limiting. Its internal 16-bit ADC digitizes VIN, VOUT0/VOUT1, IOUT0/IOUT1, temperature (internal/external), and IIN with 90ms round-robin conversion latency.
Digital management is handled via a PMBus-compliant interface supporting READ/WRITE commands for voltage/current/frequency/sequencing/margining/compensation parameters, with configuration stored in on-chip EEPROM (10k write cycles, 10-year retention at TJ ≤ 125°C) and CRC-protected fault logging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 60V - enables direct connection to 48V telecom distribution rails without pre-regulation |
| Output Voltage Range | VOUT0: 1V–40V; VOUT1: 1V–40V - supports wide-ratio POL conversion for ASIC/FPGA core and I/O rails |
| Switching Frequency | 85kHz to 500kHz - adjustable via SYNC pin or PMBus; enables optimization of efficiency vs. size trade-offs |
| Output Accuracy | ±0.5% over temperature - ensures stable voltage delivery under thermal stress in enclosed systems |
| ADC Resolution | 16-bit for VOUT/IOUT, 10-bit for VIN/IIN - provides high-fidelity telemetry for closed-loop system monitoring |
| Minimum On-Time | 45ns - allows high step-down ratios (e.g., 48V→1.2V) with practical inductor values |
| Package | 52-lead 7mm × 8mm QFN with exposed GND pad - delivers θJC = 2°C/W for high-power density thermal management |
Pinout & Package
52-lead plastic QFN (7mm × 8mm), exposed thermal pad (Pin 53 = GND), RoHS-compliant, operating junction temperature range –40°C to 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 5V–60V; powers internal regulators and gate drivers |
| TG0/TG1 | Top-gate drive outputs | Drive N-channel MOSFET gates with 30ns rise/fall time into 3300pF load |
| BG0/BG1 | Bottom-gate drive outputs | Complementary low-side gate drives with 20ns transition times |
| VSENSE0+/VSENSE0– | Channel 0 output voltage sense inputs | Differential sensing with ±2mV offset; enables remote sensing for tight regulation |
| ISENSE0+/ISENSE0– | Channel 0 output current sense inputs | Supports DCR or shunt-based sensing; full-scale range up to ±100A |
| EXTVCC | External bias supply input | Accepts 7V–14V to power DRVCC regulator, improving efficiency and die temperature |
| SDA/SCL | PMBus/I²C bidirectional data/clock | 400kHz max speed; open-drain with 0.4V VOL @ 3mA sink |
| PGOOD0/PGOOD1 | Power-good status outputs | Open-drain indicators asserting when respective VOUT is within ±5% of setpoint |
| FAULT0/FAULT1 | Per-channel fault reporting | Asserted on OV/UV/OC/OT events; configurable via PMBus fault masking |
| SHARE_CLK | PolyPhase synchronization clock output | Enables accurate current sharing across up to six phases with <1° phase error |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM controllers | Each with dedicated VSENSE/ISENSE/ITH/ITHR pins - enables asymmetric rail generation (e.g., 12V + 3.3V) without external coordination |
| Integrated telemetry ADC/DAC | 16-bit VOUT/IOUT readback + 12-bit DAC for servo-based digital margining - eliminates need for external monitoring ICs |
| On-chip EEPROM with ECC | Stores configuration, fault logs, and calibration data with CRC protection - ensures reliable startup after power loss |
| Programmable loop compensation | Adjustable gm amplifier gain (1.0–5.76 mmho) and RITHR resistor value (0–62kΩ) - allows tuning for diverse output filter topologies |
| Light-load operation modes | Selectable pulse-skipping or forced continuous conduction - balances efficiency at light loads vs. output ripple requirements |
Applications
| Telecom Rectifier Modules | Data Center Voltage Regulator Modules (VRMs) |
|---|---|
Use Scenario: 48V input DC-DC conversion for distributed power architecture in central office equipment. IC Role / Device Role / Timing Role: Dual-output controller managing primary 12V bus and secondary 3.3V auxiliary rail with synchronized switching. Use Value: ±0.5% VOUT accuracy and real-time telemetry enable compliance with GR-1089 immunity requirements and predictive maintenance. | Use Scenario: High-current POL conversion for AI accelerators requiring tightly regulated 0.8V core and 1.8V memory rails. IC Role / Device Role / Timing Role: PolyPhase® master coordinating up to 6 phases per output with SHARE_CLK for sub-1% current imbalance. Use Value: 45ns minimum on-time supports 48V→0.8V conversion using standard inductors; EEPROM stores per-rail sequencing timing. |
| Industrial PLC Power Supplies | Storage System Backplanes |
Use Scenario: Ruggedized 24V input power for programmable logic controllers with isolated I/O and fieldbus interfaces. IC Role / Device Role / Timing Role: Dual-channel controller delivering isolated 5V (logic) and 24V (actuator) outputs with independent FAULT signaling. Use Value: Internal temperature sensor + external TSNS inputs provide dual-point thermal monitoring for fan control and derating. | Use Scenario: Redundant 12V/5V power for SAS/SATA backplanes in enterprise storage enclosures. IC Role / Device Role / Timing Role: PMBus-managed controller enabling hot-swap sequencing, voltage margining, and fault logging via host BMC. Use Value: Fault logging with timestamped EEPROM entries supports root-cause analysis during field failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output digital power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3886IUHF#TRPBF | Lower VOUT range (0.5V–13.8V), supports external VDD25 regulator, includes RCONFIG pins for analog configuration | Optimized for low-voltage, high-current CPU/GPU VRMs; lacks 40V VOUT capability | Select when targeting sub-12V rails with tighter transient response requirements and no need for >13.8V outputs |
| TPS546D24ARVFT | Single-output, 4.5V–18V input, 0.5V–5.5V output, integrated MOSFETs, TI's Fusion Digital Power GUI | Monolithic solution for space-constrained point-of-load; no dual independent outputs or 60V input support | Select for compact, cost-sensitive designs where 60V input and dual-rail flexibility are not required |
Compared with LTC3886IUHF#TRPBF and TPS546D24ARVFT, the LTC3889IUKG#TRPBF uniquely combines 60V input tolerance, 40V output capability, dual independent controllers, and full PMBus telemetry - making it the only option for high-voltage telecom/datacom POL with comprehensive digital supervision.
Availability
LTC3889IUKG#TRPBF is available at Aetrix Electronics and suitable for telecom rectifier modules, data center VRMs, industrial PLC power supplies, storage system backplanes, and high-reliability embedded power systems requiring stable component supply and long-term lifecycle support.
Supply support for LTC3889IUKG#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 LTC3889IUKG#TRPBF belongs to Analog Devices' Power by Linear™ digital power controller family, designed specifically for high-efficiency, digitally managed DC/DC conversion in infrastructure and industrial applications demanding telemetry, fault resilience, and configuration persistence.
FAQ
What is the maximum input voltage rating for the LTC3889IUKG#TRPBF?
The LTC3889IUKG#TRPBF has an absolute maximum input voltage rating of 65V on the VIN pin, with recommended operating range of 5V to 60V. This allows direct integration into 48V telecom distribution systems while maintaining 5V headroom for transient suppression. Operation below 6V requires tying EXTVCC to VIN per datasheet Note 12.
Does the LTC3889IUKG#TRPBF support both pulse-skipping and continuous conduction modes?
Yes, the LTC3889IUKG#TRPBF supports selectable light-load operation modes: discontinuous conduction (pulse-skipping) for peak efficiency at light loads, and forced continuous conduction mode for low-noise, predictable ripple performance. Mode selection is configurable via PMBus command MFR_PWM_MODE_LTC3889 or RCONFIG pins.
How does the LTC3889IUKG#TRPBF handle fault logging and recovery?
The LTC3889IUKG#TRPBF integrates EEPROM with ECC that stores timestamped fault events (OV/UV/OC/OT), including cause, severity, and register state at time of occurrence. After fault clearance, the device can restore user configuration via RESTORE_USER_ALL command, ensuring deterministic restart behavior without host intervention.
What is the resolution and accuracy of output voltage telemetry on the LTC3889IUKG#TRPBF?
The LTC3889IUKG#TRPBF provides 16-bit ADC resolution for VOUT readback with 977µV LSB step size and ±0.5% total unadjusted error over temperature. This enables precise closed-loop monitoring of 12V or 24V rails with sub-60mV absolute error - critical for compliance with server VR14/IMVP specifications.
Can the LTC3889IUKG#TRPBF be used in PolyPhase® configurations beyond two phases?
Yes, the LTC3889IUKG#TRPBF supports up to six-phase operation per output channel using the SHARE_CLK pin to synchronize multiple controllers. Phase spacing is programmable in 60° increments (0°, 60°, 90°, 120°, 240°, 270°, 300°) via MFR_PWM_CONFIG_LTC3889 register, enabling optimal current sharing and reduced input/output capacitor RMS current.
LTC3889IUKG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-WFQFN, 46 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 40V
- Current - Output:
- -
- Frequency - Switching:
- 85kHz ~ 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-QFN (7x8)
LTC3889IUKG#TRPBF FAQ
1.How can I place an order for LTC3889IUKG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3889IUKG#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 LTC3889IUKG#TRPBF reliable?
The price and inventory of LTC3889IUKG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3889IUKG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3889IUKG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3889IUKG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3889IUKG#TRPBF?
LTC3889IUKG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3889IUKG#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 LTC3889IUKG#TRPBF?
For technical support, including LTC3889IUKG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3889IUKG#TRPBF requirements.
6.How does Aetrix verify that LTC3889IUKG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3889IUKG#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 LTC3889IUKG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3889IUKG#TRPBF?
All LTC3889IUKG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3889IUKG#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 LTC3889IUKG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3889IUKG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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