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Analog Devices Inc. LTC3862HUH#TRPBF
- Part No.:
- LTC3862HUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WQFN Exposed Pad
- Datasheet:
-
LTC3862HUH#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,618
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Product details
Overview
LTC3862HUH#TRPBF from Analog Devices is a two-phase, constant-frequency, peak current mode boost/SEPIC DC/DC controller driving N-channel MOSFETs. It operates from 4V to 36V input, delivers up to 96% max duty cycle, supports 75kHz–500kHz adjustable switching frequency, and features internal 5V/3.8V LDOs. It targets high-efficiency automotive and industrial boost supplies delivering stable 48V outputs.
For engineers reviewing the LTC3862HUH#TRPBF datasheet, LTC3862HUH#TRPBF pinout, LTC3862HUH#TRPBF application, or LTC3862HUH#TRPBF equivalent, key selection criteria include phase synchronization capability (SYNC/CLKOUT), programmable slope compensation, leading-edge blanking control, and AEC-Q100 H-grade thermal rating (–40°C to 150°C).
Technical Context
The LTC3862HUH#TRPBF implements fixed-frequency, peak current mode control with dual independent channels operating 180° out of phase. Its error amplifier (±1% reference) drives the ITH pin to set per-cycle peak current thresholds, while slope compensation gain is programmable via the SLOPE pin to ensure stability across duty cycles.
Multi-phase operation is enabled through SYNC input, CLKOUT output, and PHASEMODE pin-supporting 2-, 3-, 4-, 6-, or 12-phase configurations. The internal PLL allows synchronization to external clocks from 50kHz to 650kHz, and DMAX pin sets precise maximum duty cycle (75%, 84%, or 96%) derived from a 12× internal clock.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide automotive battery range including cold-crank (4.5V) and load-dump (36V) conditions. |
| Switching Frequency | 75kHz to 500kHz - set by single resistor on FREQ pin; enables optimization of size vs. efficiency in boost designs. |
| Max Duty Cycle | Up to 96% - configurable via DMAX pin; critical for high-step-up ratios (e.g., 12V→48V) without requiring transformer-based topologies. |
| Gate Drive Voltage | 5V (INTVCC) - logic-level compatible for low-RDS(on) N-MOSFETs; eliminates need for external level shifters or gate drivers. |
| Reference Accuracy | ±1% over temperature - ensures tight output voltage regulation (e.g., 48V ±0.48V) without post-regulation circuitry. |
| Operating Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade H; suitable for under-hood automotive power modules. |
| Package | 24-lead 5mm × 5mm QFN (UH) - thermally enhanced with exposed PGND pad (θJA = 44°C/W); enables high-power density layouts. |
Pinout & Package
Package: 24-lead (5mm × 5mm) plastic QFN with 0.65mm lead pitch and exposed thermal pad (Pin 25 = PGND). Requires soldering of exposed pad to PCB ground plane for rated thermal performance (θJA = 44°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE1 / GATE2 | Power MOSFET gate drive outputs | 5V logic-level outputs referenced to PGND; drive N-channel MOSFETs directly without external buffers. |
| SENSE1+/SENSE1– / SENSE2+/SENSE2– | Dual current sense differential inputs | Measure MOSFET source current via low-side sense resistors; enable per-phase current limiting and matching (±10mV channel-to-channel). |
| FB | Error amplifier inverting input | Connects to resistive divider from VOUT; sets regulated output voltage using internal 1.223V reference. |
| ITH | Error amplifier output / current limit control | Directly programs peak current threshold; also used for loop compensation network connection. |
| DMAX | Maximum duty cycle programming | SGND = 96%, float = 84%, 3V8 = 75%; enables safe operation at high step-up ratios with precise timing control. |
| PHASEMODE | Inter-channel phase relationship control | Selects 120°, 180°, or 240° phase offset between CH1/CH2 and CLKOUT for optimal ripple cancellation in multi-phase systems. |
| SYNC / CLKOUT | PLL synchronization interface | SYNC accepts 50–650kHz external clock; CLKOUT provides phase-aligned digital output for daisy-chaining multiple controllers. |
| INTVCC / 3V8 | Cascaded LDO outputs | INTVCC = 5V @ 50mA (gate drivers); 3V8 = 3.8V @ ~10mA (analog/digital core); both require local ceramic bypassing. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase current mode control | Reduces input/output capacitor requirements by √2 vs. single-phase; lowers RMS current stress in magnetics and capacitors. |
| Programmable slope compensation | SLOPE pin adjusts gain (0.625× to 1.66× nominal) to maintain stability across wide duty cycle and inductor value ranges. |
| Adjustable leading edge blanking | BLANK pin selects 180ns (SGND), 260ns (float), or 340ns (3V8) blanking window to reject MOSFET switch-node noise during current sensing. |
| Internal cascaded LDOs | 5V INTVCC powers gate drivers; 3.8V 3V8 powers analog/digital circuits - eliminates need for external bias rails and improves PSRR. |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation with full electrical characterization; meets automotive reliability and lifetime requirements. |
Applications
| Automotive 48V Mild Hybrid Systems | Industrial Telecom Power Supplies |
|---|---|
|
Use Scenario: Boosting 12V vehicle battery to regulated 48V rail for electric turbochargers, active suspension, and ADAS ECUs. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel N-MOSFETs with synchronized gate drive and current balancing. Use Value: Achieves >94% efficiency at 5A output while meeting AEC-Q100 H-grade thermal limits and reducing EMI via interleaved switching. |
Use Scenario: Generating isolated 48V intermediate bus from 24V or 36V industrial DC input for PoE++ switches and base station RF amplifiers. IC Role / Device Role / Timing Role: High-voltage boost controller with programmable frequency and duty cycle for optimized magnetics sizing and transient response. Use Value: Enables compact, high-density 48V/10A design with <1% output voltage drift over line/load/temperature using integrated precision reference. |
| Medical Imaging Power Modules | Test Equipment High-Voltage Bias Supplies |
|
Use Scenario: Providing stable, low-noise 48V supply for CT scanner detector arrays requiring strict ripple and long-term stability. IC Role / Device Role / Timing Role: Dual-channel current-mode controller with soft-start, UVLO, and precision feedback for safety-critical power conversion. Use Value: Delivers <10mVpp output ripple and ±0.5% regulation accuracy over 10-year field life, supported by AEC-Q100 reliability data. |
Use Scenario: Generating programmable 30–60V bias rails for semiconductor parametric test systems requiring fast voltage settling and low quiescent current. IC Role / Device Role / Timing Role: Adjustable-frequency boost controller with SYNC input for system-level clock alignment and jitter reduction. Use Value: Supports rapid output voltage changes (<50µs settling) via ITH-based current limit modulation and 500kHz max switching frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862IUH#TRPBF | Same architecture and pinout; rated for –40°C to +125°C (I-grade) instead of +150°C (H-grade). | Targeted at industrial or non-under-hood automotive applications where junction temperature remains below 125°C. | Select when thermal margin permits lower-cost I-grade qualification and full H-grade validation is unnecessary. |
| LTC3862HUH#TR | Identical electrical specs and package; differs only in tape-and-reel packaging (no #PBF suffix indicates non-lead-free finish). | Not suitable for RoHS-compliant production; limited to legacy or non-regulated markets. | Choose LTC3862HUH#TRPBF for new designs requiring lead-free compliance and standard JEDEC packaging. |
Compared with LTC3862IUH#TRPBF, the LTC3862HUH#TRPBF offers extended thermal endurance for under-hood deployment, while LTC3862HUH#TR lacks RoHS compliance-making the #TRPBF variant the only fully qualified option for modern automotive and industrial OEM programs.
Availability
LTC3862HUH#TRPBF is available at Aetrix Electronics and suitable for automotive 48V systems, industrial telecom power supplies, and medical imaging equipment requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.
Supply support for LTC3862HUH#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 (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC3862HUH#TRPBF belongs to the Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding automotive, industrial, and telecom boost/SEPIC applications requiring precision regulation and robust thermal performance.
FAQ
What is the maximum output voltage achievable with the LTC3862HUH#TRPBF?
The LTC3862HUH#TRPBF itself does not impose a hard upper limit on output voltage-it is a controller, not a regulator. Output voltage is determined by external components (inductor, diode, capacitor, feedback divider). In typical 48V boost applications, the LTC3862HUH#TRPBF maintains regulation up to 60V with appropriate MOSFET and diode selection. The FB pin reference is 1.223V, so VOUT = 1.223V × (1 + R1/R2).
Does the LTC3862HUH#TRPBF support SEPIC topology in addition to boost?
Yes, the LTC3862HUH#TRPBF explicitly supports both boost and SEPIC topologies per its datasheet description and functional diagram. Its dual N-channel gate drivers, current-mode architecture, and flexible feedback configuration allow direct implementation of either topology. For SEPIC, the controller manages two inductors and a coupling capacitor, with SENSE pins monitoring primary-side current.
How does the PHASEMODE pin affect timing relationships in multi-phase operation?
The PHASEMODE pin configures the phase offset between Channel 1 and Channel 2 (180°, 120°, or 240°), and also sets the relationship between Channel 1 and CLKOUT. When floating, PHASEMODE yields 180° CH1–CH2 and 90° CH1–CLKOUT; tied to SGND it gives 120° and 240° respectively. This enables precise ripple cancellation and scalable phase count without external timing ICs.
What is the purpose of the 3V8 pin and how should it be decoupled?
The 3V8 pin is the output of an internal 3.8V LDO powered from INTVCC, supplying low-voltage analog and digital circuitry. It must be decoupled with a 1nF X5R ceramic capacitor placed directly between 3V8 and SGND, as close as possible to the IC. This pin is not intended to power external circuitry-only internal blocks such as the error amplifier and comparators.
Can the LTC3862HUH#TRPBF synchronize to an external clock outside the 75kHz–500kHz range?
Yes-the LTC3862HUH#TRPBF's PLL can lock to external SYNC signals from 50kHz to 650kHz, exceeding its free-running frequency range. This allows system-level clock alignment in multi-rail power architectures. The rising edge of SYNC aligns with GATE1's rising edge in closed-loop operation, and the internal PLL filter (PLLFLTR pin) must be configured accordingly for stability.
LTC3862HUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 36V
- Frequency - Switching:
- 75kHz ~ 500kHz
- Duty Cycle (Max):
- 96%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Phase Control, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (5x5)
LTC3862HUH#TRPBF FAQ
1.How can I place an order for LTC3862HUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862HUH#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 LTC3862HUH#TRPBF reliable?
The price and inventory of LTC3862HUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862HUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862HUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862HUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862HUH#TRPBF?
LTC3862HUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862HUH#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 LTC3862HUH#TRPBF?
For technical support, including LTC3862HUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862HUH#TRPBF requirements.
6.How does Aetrix verify that LTC3862HUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862HUH#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 LTC3862HUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862HUH#TRPBF?
All LTC3862HUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862HUH#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 LTC3862HUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862HUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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