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Analog Devices Inc. LTC3853HUJ#TRPBF
- Part No.:
- LTC3853HUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3853HUJ#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,421
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Product details
Overview
LTC3853HUJ#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance triple-output, multiphase synchronous step-down controller driving all-N-channel MOSFET stages. It supports 120° phased operation across three channels, delivers up to 13.5V on Phase 3, operates from 4.5V–24V input, and achieves ±0.75% output voltage accuracy at 0.8V reference - used in high-density server VRMs and telecom power systems.
For engineers reviewing the LTC3853HUJ#TRPBF datasheet, LTC3853HUJ#TRPBF pinout, LTC3853HUJ#TRPBF application, or LTC3853HUJ#TRPBF equivalent, key selection criteria include phase configuration flexibility (3×120°, 2×180°+1, or single 3-phase), RSENSE/DCR current sensing, programmable soft-start/tracking via TK/SS pins, and H-grade operation up to 150°C junction temperature.
Technical Context
The LTC3853HUJ#TRPBF implements a constant-frequency current-mode control architecture with independent error amplifiers and transconductance gm = 2.2 mmho per channel. Each phase features dedicated ITH, VFB, SENSE+, SENSE−, TK/SS, and RUN pins enabling precise regulation, current foldback limiting, and coincident/ratiometric tracking.
Its phase-locked loop (PLL) accepts external clocks on MODE/PLLIN and uses FREQ/PLLFLTR for frequency programming (250–750 kHz). The controller supports pre-biased outputs, Burst Mode® for light-load efficiency, and dual PGOOD monitors with ±7.5% trip thresholds - all while maintaining independent shutdown and startup control per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V (28V absolute max) - supports 5V/12V intermediate bus and wide battery chemistries. |
| Output Voltage Range (Ch1,2) | 0.8V to 5.5V - enables core logic and I/O rail regulation with ±0.75% accuracy at 0.8V. |
| Output Voltage Range (Ch3) | 0.8V to 13.5V - allows high-side analog or interface supply generation without external boost. |
| Switching Frequency | 250kHz to 750kHz (phase-lockable) - balances efficiency vs. inductor/capacitor size trade-offs. |
| Operating Junction Temp | –40°C to 150°C (H-grade) - qualified for harsh industrial and automotive under-hood environments. |
| Current Sensing | RSENSE or DCR - eliminates sense resistor losses and supports accurate current foldback during short-circuit. |
| Soft-Start Current | 1.3µA typical - sets predictable voltage ramp rate via external capacitor on TK/SS pins. |
Pinout & Package
40-lead 6mm × 6mm plastic QFN package (UJ) with exposed PGND pad (Pin 41) requiring PCB soldering for thermal and electrical integrity. θJA = 33°C/W; TJMAX = 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG1, TG2, TG3 | Top gate driver outputs | Floating drivers with INTVCC-referenced swing - drive high-side N-MOSFET gates via bootstrap capacitors. |
| BG1, BG2, BG3 | Bottom gate driver outputs | Ground-referenced drivers - directly control low-side N-MOSFETs with 1.1Ω pull-down resistance. |
| SENSE1+/2+/3+, SENSE1−/2−/3− | Current sense comparator inputs | Differential inputs supporting RSENSE or DCR sensing; Ch3 common-mode up to 13.5V enables high-VOUT regulation. |
| VFB1, VFB2, VFB3 | Error amplifier feedback inputs | Remote-sense inputs tied to resistive dividers - regulate output by comparing to 0.8V internal reference. |
| ITH1, ITH2, ITH3 | Error amplifier output / current threshold | Controls peak inductor current per channel; voltage determines current limit and compensates loop dynamics. |
| TK/SS1, TK/SS2, TK/SS3 | Soft-start and tracking inputs | Internal 1.3µA current charges external capacitor - enables controlled voltage ramp or ratiometric tracking between outputs. |
| MODE/PLLIN | Mode selection & PLL sync input | Selects Burst Mode®, pulse-skipping, or forced continuous mode; accepts external clock for synchronization. |
| PGOOD12, PGOOD3 | Open-drain power-good indicators | Assert low when any monitored VFB deviates >±7.5% - provides system-level fault signaling with 17µs mask timer. |
Key Features
| Feature | Design Value |
|---|---|
| Triple 120° phased control | Reduces input capacitance requirements by ~50% and lowers RMS input ripple current versus single-phase designs. |
| Configurable topology | Supports 3×120°, dual 180° + single, or unified 3-phase modes - adapts to varying load distribution and layout constraints. |
| Independent channel control | Each channel has dedicated RUN, TK/SS, ITH, and VFB - enables staggered startup, selective shutdown, and dynamic reconfiguration. |
| Pre-biased output support | Allows safe startup into existing output voltage - critical for hot-swap and redundant power systems. |
| H-grade temperature rating | Guaranteed operation from –40°C to 150°C junction - eliminates derating concerns in high-ambient industrial applications. |
Applications
| Telecom Base Station Power | High-Density Server VRM |
|---|---|
Use Scenario: Regulating multiple isolated DC rails (e.g., 5V, 3.3V, 1.2V) for FPGA, ASIC, and memory subsystems in 4G/5G macro base stations. IC Role / Device Role / Timing Role: Triple-output synchronous buck controller managing independent power domains with phase interleaving to minimize input EMI. Use Value: 120° phasing reduces input capacitor RMS current by 58%, extending capacitor lifetime and lowering board area vs. discrete controllers. | Use Scenario: Delivering tightly regulated, high-current CPU/GPU core voltages (e.g., 1.2V @ 100A+) in rack-mounted servers with strict thermal limits. IC Role / Device Role / Timing Role: Multiphase controller configured as unified 3-phase output - drives paralleled MOSFETs with synchronized switching to maximize current capability. Use Value: Supports up to 13.5V on Phase 3 for auxiliary supplies (e.g., VDDQ, VPP), eliminating need for separate regulators and reducing BOM count. |
| Industrial PLC Power Management | Automotive ADAS Domain Controller |
Use Scenario: Generating stable 5V, 3.3V, and 12V rails for microcontrollers, I/O modules, and communication interfaces in programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: Triple-output controller with independent RUN pins - enables firmware-controlled sequencing and fault isolation across subsystems. Use Value: H-grade (–40°C to 150°C) operation ensures reliability in uncooled enclosures; ±0.75% output accuracy maintains sensor/interface timing margins. | Use Scenario: Powering radar, camera, and AI accelerator subsystems in autonomous driving domain controllers where thermal management is constrained. IC Role / Device Role / Timing Role: High-efficiency triple controller using Burst Mode® at light loads - minimizes standby power while maintaining fast transient response for safety-critical wake events. Use Value: Pre-biased output support enables seamless failover between primary and backup power sources during vehicle ignition cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3855IUJ#TRPBF | Quad-output controller with identical 40-pin QFN package, same 4.5V–24V input, but adds fourth channel and enhanced phase synchronization. | Suitable for systems requiring four regulated rails or higher total output current; lacks H-grade temp rating (max 125°C). | Select LTC3855IUJ#TRPBF only if fourth output is required and ambient temperature remains ≤125°C. |
| MP2950GQ-10-Z | Triple-output controller with integrated MOSFET drivers, 4.5V–28V input, but no RSENSE/DCR option and fixed 600kHz frequency. | Targeted at cost-sensitive consumer applications; lacks independent channel tracking, pre-bias support, and H-grade qualification. | Choose MP2950GQ-10-Z only for non-critical commercial designs where thermal margin and feature set are secondary to BOM cost. |
Compared with LTC3855IUJ#TRPBF and MP2950GQ-10-Z, the LTC3853HUJ#TRPBF uniquely combines H-grade temperature robustness, full RSENSE/DCR flexibility, and independent per-channel soft-start/tracking - making it optimal for thermally demanding industrial and telecom infrastructure where reliability and design adaptability are paramount.
Availability
LTC3853HUJ#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and automotive ADAS domain controllers requiring stable component supply, long-term lifecycle assurance, and guaranteed H-grade performance.
Supply support for LTC3853HUJ#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 standards.
The LTC3853 product line delivers precision multiphase DC/DC control for high-current, multi-rail applications in infrastructure and industrial systems where thermal resilience and channel independence are critical.
FAQ
What is the maximum output voltage supported by LTC3853HUJ#TRPBF on Channel 3?
The LTC3853HUJ#TRPBF supports an output voltage range of 0.8V to 13.5V on Channel 3, as confirmed in the Electrical Characteristics table (Page 3). This capability enables direct regulation of higher-voltage rails such as 12V analog supplies or interface voltages without requiring external boost circuitry. The SENSE3+ and SENSE3− pins are rated for common-mode voltages up to 13.5V, ensuring safe operation at this maximum output level.
Does LTC3853HUJ#TRPBF support pre-biased output startup?
Yes, the LTC3853HUJ#TRPBF explicitly supports pre-biased output startup, as documented in the Features list and Applications Information section. This functionality allows the controller to safely begin regulation when the output capacitor already holds voltage - essential for hot-swap, redundant power, and fault-recovery scenarios. The device achieves this through internal circuitry that prevents reverse current flow and manages gate drive sequencing during initial turn-on.
What is the guaranteed operating junction temperature range for LTC3853HUJ#TRPBF?
The LTC3853HUJ#TRPBF is an H-grade part with a guaranteed operating junction temperature range of –40°C to 150°C, as specified in the Order Information table (Page 2) and confirmed in Note 3 of the Electrical Characteristics (Page 4). This rating exceeds standard industrial grade (–40°C to 125°C) and qualifies the device for deployment in high-ambient environments such as enclosed industrial cabinets or under-hood automotive locations without thermal derating.
How does the MODE/PLLIN pin configure operating modes on LTC3853HUJ#TRPBF?
The MODE/PLLIN pin on the LTC3853HUJ#TRPBF selects among three light-load operating modes: tie to SGND for forced continuous conduction, tie to INTVCC for pulse-skipping, or leave floating for Burst Mode® operation. Additionally, applying an external clock signal to this pin synchronizes the internal oscillator in forced continuous mode. These configurations are detailed in the Pin Functions (Page 8) and Operation sections (Pages 11–12) of the datasheet.
Can LTC3853HUJ#TRPBF be configured for dual-phase plus single-phase operation?
Yes, the LTC3853HUJ#TRPBF can be configured as a dual-phase (180° out-of-phase) controller plus an independent single-phase controller. This is achieved by connecting VFB2 to VIN through a 200kΩ resistor and shorting ITH1/ITH2 externally, as described in the Features list and Pin Functions section (Page 8). This topology provides design flexibility for asymmetric load distributions - for example, powering two high-current rails with interleaved phases while supplying a third lower-current rail independently.
LTC3853HUJ#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-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:
- 3
- Output Phases:
- 3
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 24V
- Frequency - Switching:
- 250kHz ~ 750kHz
- Duty Cycle (Max):
- 98%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LTC3853HUJ#TRPBF FAQ
1.How can I place an order for LTC3853HUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3853HUJ#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 LTC3853HUJ#TRPBF reliable?
The price and inventory of LTC3853HUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3853HUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3853HUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3853HUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3853HUJ#TRPBF?
LTC3853HUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3853HUJ#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 LTC3853HUJ#TRPBF?
For technical support, including LTC3853HUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3853HUJ#TRPBF requirements.
6.How does Aetrix verify that LTC3853HUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3853HUJ#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 LTC3853HUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3853HUJ#TRPBF?
All LTC3853HUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3853HUJ#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 LTC3853HUJ#TRPBF part is unused and in its original packaging.
Return procedure for LTC3853HUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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