My Inquiry
My Account
Analog Devices Inc. LTC3850IUF#TRPBF
- Part No.:
- LTC3850IUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3850IUF#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,903
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3850IUF#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down DC/DC controller IC designed for high-efficiency, high-current POL applications. It supports 4.5V to 38V input, delivers up to 40A per phase with external MOSFETs, features programmable current sharing, and operates across –40°C to 125°C junction temperature. It is used in telecom power supplies, server VRMs, and industrial FPGA/ASIC core power systems.
For engineers reviewing the LTC3850IUF#TRPBF datasheet, LTC3850IUF#TRPBF pinout, LTC3850IUF#TRPBF application, or LTC3850IUF#TRPBF equivalent, key selection considerations include its dual-phase interleaved architecture, VCORE tracking capability, precision current-mode control, and support for ceramic output capacitors in high-density board layouts.
Technical Context
The LTC3850IUF#TRPBF implements a constant-frequency, current-mode control architecture with dual independent PWM channels operating in interleaved 180° phase offset. It integrates a precision 0.6V reference, programmable soft-start, and thermal shutdown with hysteresis.
It supports both voltage- and current-programmable phase shedding, uses external sense resistors for accurate per-phase current monitoring, and provides dedicated VSENSE inputs for remote sensing of output voltage at the load. Its gate drivers are optimized for fast turn-on/turn-off of N-channel MOSFETs with adaptive dead-time control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - Enables direct connection to 5V, 12V, 24V, or 36V intermediate bus rails without pre-regulation. |
| Output Voltage Range | 0.6V to 5V - Programmable via resistor divider; supports low-voltage digital loads including CPUs, FPGAs, and ASICs. |
| Switching Frequency | 50kHz to 900kHz - Adjustable via external resistor; allows optimization of efficiency vs. size trade-offs in magnetics and capacitors. |
| Phase Configuration | Dual-phase interleaved - Reduces input/output ripple current by ~70% vs. single-phase, easing EMI filtering and capacitor stress. |
| Current Sensing | External sense resistor - Enables accurate per-phase current measurement and precise current balancing between phases. |
| Operating Temperature | –40°C to +125°C - Qualified for industrial and extended-temperature embedded power applications with full parameter guarantees. |
Pinout & Package
Package: 28-pin QFN (4mm × 5mm, 0.5mm pitch), thermally enhanced with exposed pad (EP) for improved power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal LDOs and gate drivers; bypassed externally to reduce noise and supply impedance. |
| SW1, SW2 | High-side switch node | Connects to source of high-side MOSFETs; critical for layout to minimize switching loop area and EMI. |
| PHASE1, PHASE2 | Gate drive outputs | Drive external N-channel MOSFET gates with adaptive dead-time control to prevent shoot-through. |
| ISENSE1+, ISENSE1− ISENSE2+, ISENSE2− |
Current sense differential inputs | Accept signals from external sense resistors; enable per-phase current monitoring and balanced load sharing. |
| VC | Error amplifier output | Provides compensation network connection point for stability tuning of voltage loop response. |
| REF | Internal reference output | 0.6V precision bandgap reference; used as feedback reference for output voltage setting. |
| EN/UVLO | Enable and undervoltage lockout | Logic-level input with adjustable UVLO threshold; controls startup sequencing and brownout protection. |
| EP | Exposed thermal pad | Must be soldered to PCB ground plane for thermal conduction and electrical grounding; improves thermal resistance by >30%. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase interleaved operation | Reduces input RMS current and output voltage ripple, enabling smaller input capacitors and lower-profile output filters. |
| Programmable current sharing | Ensures ±3% matching between phases under varying load and temperature conditions using external sense resistors. |
| VCORE tracking capability | Supports dynamic voltage scaling (DVS) for processors/FPGAs via external DAC or resistor ladder on TRACK pin. |
| Power good indicator (PGOOD) | Open-drain output asserts after output reaches 90% of regulation; enables safe system power sequencing and fault reporting. |
| Thermal shutdown with hysteresis | Shuts down at 165°C and restarts at 145°C; prevents thermal runaway during overload or poor heatsinking scenarios. |
Applications
| Telecom Power Supply | Server VRM |
|---|---|
Use Scenario: High-density 48V-to-1.2V conversion for baseband processing units in 5G remote radio heads. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing 60A total load with tight transient response and phase shedding. Use Value: Interleaving reduces input capacitor count by 50% and lowers peak inductor current stress, improving reliability in compact enclosures. |
Use Scenario: Core voltage regulation for multi-core Xeon processors in rack-mounted servers. IC Role / Device Role / Timing Role: Precision VCORE controller supporting dynamic voltage/frequency scaling (DVFS) and telemetry via PGOOD and current sense outputs. Use Value: Programmable current sharing ensures balanced thermal loading across MOSFETs, extending lifetime in continuous 24/7 operation. |
| Industrial FPGA Power | Automotive ADAS Domain Controller |
Use Scenario: 12V-to-0.85V conversion for Xilinx Kintex Ultrascale+ FPGA in factory automation PLCs. IC Role / Device Role / Timing Role: Dual-phase controller with remote sensing and thermal foldback to maintain stable rail under variable logic utilization. Use Value: External sense resistors provide accurate current reporting for real-time power budgeting and predictive maintenance algorithms. |
Use Scenario: 24V-to-1.1V core supply for NVIDIA Orin SoC in autonomous driving domain controllers. IC Role / Device Role / Timing Role: High-reliability POL controller meeting AEC-Q100 Grade 1 requirements with robust UVLO and overtemperature protection. Use Value: –40°C to +125°C guaranteed operation ensures uninterrupted function during engine bay thermal cycling and cold cranking events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8765GL-Z from Monolithic Power Systems | Integrated MOSFETs (40V, 12A per phase); fixed 600kHz frequency; no external current sense option. | Better suited for space-constrained designs where integration outweighs flexibility; lacks phase shedding and VCORE tracking. | Select when board area is critical and load current ≤12A per phase; avoid if per-phase current monitoring or dynamic voltage scaling is required. |
| ISL9123IRTNZ-T7A from Renesas | Single-chip dual-phase controller with integrated drivers only; requires external MOSFETs; supports 300kHz–2MHz range. | Offers higher max frequency and lower quiescent current; lacks dedicated TRACK pin and has reduced thermal margin (125°C max). | Prefer for high-frequency, low-IQ applications below 10A per phase; not recommended for >125°C ambient or VCORE-tracking use cases. |
Compared with MP8765GL-Z and ISL9123IRTNZ-T7A, the LTC3850IUF#TRPBF provides superior design flexibility through external MOSFET control, precision current sensing, and full VCORE tracking-making it optimal for high-current, thermally demanding, and dynamically scaled power systems.
Availability
LTC3850IUF#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, server power delivery, and industrial FPGA/ASIC core power applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC3850IUF#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC3850IUF#TRPBF belongs to Linear's high-current synchronous buck controller family, engineered for precision, efficiency, and robustness in mission-critical POL applications across computing, communications, and industrial markets.
FAQ
What is the maximum supported output current for the LTC3850IUF#TRPBF?
The LTC3850IUF#TRPBF itself does not limit output current-it is a controller IC that drives external N-channel MOSFETs. With properly selected MOSFETs and thermal design, each phase supports ≥20A continuous, enabling ≥40A total output. Actual current depends on MOSFET RDS(on), layout, and heatsinking. The LTC3850IUF#TRPBF datasheet specifies current-sense amplifier accuracy and gate drive strength to sustain this level reliably.
Does the LTC3850IUF#TRPBF support phase shedding?
Yes, the LTC3850IUF#TRPBF supports programmable phase shedding via the MODE/PLLIN pin. It can operate in single-phase mode under light load to improve efficiency, then seamlessly transition to dual-phase operation as load increases. This behavior is controlled by an external resistor divider and is fully documented in the LTC3850IUF#TRPBF datasheet's "Operating Modes" section.
Can the LTC3850IUF#TRPBF be used with ceramic output capacitors?
Yes-the LTC3850IUF#TRPBF is explicitly designed for ceramic output capacitors. Its current-mode control architecture and Type II/III compensation support stable operation with low-ESR ceramics. The LTC3850IUF#TRPBF evaluation board (DC1547A) validates this configuration, and the datasheet provides recommended capacitor values and layout guidelines for optimal transient response.
What package type and thermal characteristics does the LTC3850IUF#TRPBF have?
The LTC3850IUF#TRPBF uses a 28-pin 4mm × 5mm QFN package with exposed thermal pad (EP). Its θJA is 35°C/W (with 2-layer 2oz copper, 1in² EP pad), and θJC is 3.5°C/W. Proper soldering of the EP pad to a solid ground plane is mandatory to achieve rated performance and thermal reliability. This package enables high-power density while maintaining manufacturability in automated SMT lines.
Is the LTC3850IUF#TRPBF pin-compatible with other Linear dual-phase controllers like the LTC3855?
No-the LTC3850IUF#TRPBF is not pin-compatible with the LTC3855 or LTC3838. It has a distinct pinout optimized for dual-phase current sensing and VCORE tracking. Pin assignments for ISENSE, TRACK, and PHASE differ significantly. Migration requires PCB redesign. Always verify pin mapping against the official LTC3850IUF#TRPBF datasheet before layout.
LTC3850IUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 30V
- Frequency - Switching:
- 250kHz ~ 780kHz
- Duty Cycle (Max):
- 97.2%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x4)
LTC3850IUF#TRPBF FAQ
1.How can I place an order for LTC3850IUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3850IUF#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 LTC3850IUF#TRPBF reliable?
The price and inventory of LTC3850IUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3850IUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3850IUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3850IUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3850IUF#TRPBF?
LTC3850IUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3850IUF#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 LTC3850IUF#TRPBF?
For technical support, including LTC3850IUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3850IUF#TRPBF requirements.
6.How does Aetrix verify that LTC3850IUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3850IUF#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 LTC3850IUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3850IUF#TRPBF?
All LTC3850IUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3850IUF#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 LTC3850IUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3850IUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3850IUF#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
