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Analog Devices Inc. LTC3862EUH#TRPBF
- Part No.:
- LTC3862EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WQFN Exposed Pad
- Datasheet:
-
LTC3862EUH#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,389
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Product details
Overview
LTC3862EUH#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 integrates dual 5V gate drivers with internal 5V/3.8V LDOs. It is used in high-efficiency 48V telecom power supplies.
For engineers reviewing the LTC3862EUH#TRPBF datasheet, LTC3862EUH#TRPBF pinout, LTC3862EUH#TRPBF application, or LTC3862EUH#TRPBF equivalent, key selection criteria include multi-phase synchronization capability (SYNC/CLKOUT/PHASEMODE), programmable leading-edge blanking, slope compensation gain adjustment, and AEC-Q100-qualified variants for automotive-grade designs.
Technical Context
The LTC3862EUH#TRPBF implements fixed-frequency peak current mode control across two interleaved channels operating 180° out of phase, reducing input/output ripple and filter component stress. Its internal PLL enables synchronization to external clocks from 50kHz to 650kHz via the SYNC pin, while CLKOUT and PHASEMODE support 2-, 3-, 4-, 6-, or 12-phase expansion.
It features cascaded LDO architecture: a 5V INTVCC regulator powers gate drivers (±50mA RMS), and a 3.8V 3V8 LDO supplies analog/digital circuitry. Precision RUN pin threshold (1.22V ±80mV hysteresis) and soft-start (5µA internal current source) enable controlled startup under varying load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports wide-input industrial and telecom power rails without pre-regulation. |
| Switching Frequency | 75kHz to 500kHz - set by single resistor on FREQ pin; enables optimization of size vs. efficiency trade-offs. |
| Max Duty Cycle | Up to 96% - configurable via DMAX pin (SGND=96%, float=84%, 3V8=75%), critical for high-step-up ratios. |
| Gate Drive | 5V output referenced to PGND - directly drives logic-level N-channel MOSFETs without level-shifting. |
| Reference Accuracy | ±1% over temperature - ensures stable 48V output regulation using FB resistive divider. |
| Current Sense Threshold | 65mV to 90mV (typ. 75mV) - matched within ±10mV between CH1/CH2 for balanced phase current sharing. |
| Thermal Rating | –40°C to +85°C junction - validated for commercial and industrial ambient environments. |
Pinout & Package
Package: 24-lead (5mm × 5mm) plastic QFN with 0.65mm lead pitch and exposed PGND pad (pin 25) requiring soldering to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Duty cycle limit control | Configures max on-time: SGND = 96%, float = 84%, 3V8 = 75% - essential for stability in high-VOUT/VIN ratios. |
| GATE1/GATE2 (Pins 18/16) | N-channel MOSFET gate drivers | 5V outputs referenced to PGND - drive logic-level FETs with 2.1Ω pull-up / 0.7Ω pull-down RDS(ON). |
| SENSE1+/SENSE2+ (Pins 23/13) | Current sense positive inputs | Accept differential voltage across sense resistors; trip threshold set by ITH voltage - enables precise peak current limiting. |
| PHASEMODE (Pin 4) | Interleaving phase configuration | Selects CH1–CH2 phase offset: 0V = 180°, float = 180°, 3V8 = 120° - determines ripple cancellation and multi-phase scalability. |
| SYNC (Pin 11) | External clock input | Accepts 50kHz–650kHz square wave; aligns GATE1 rising edge to SYNC rising edge - enables system-wide clock domain synchronization. |
| CLKOUT (Pin 10) | Phase-locked clock output | Drives downstream LTC3862 devices; phase relationship to CH1 depends on PHASEMODE - enables daisy-chained multi-phase systems. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output capacitor RMS current by ~70% versus single-phase, lowering ESR heating and size requirements. |
| Programmable slope compensation | SLOPE pin adjusts gain (−37.5%/0%/+66%) to stabilize current mode control across varying duty cycles and inductor values. |
| Adjustable leading-edge blanking | BLANK pin configures minimum on-time (180ns/260ns/340ns) to suppress gate-drive-induced sensing noise during switch turn-on. |
| Internal 5V/3.8V dual-LDO supply | Eliminates need for external bias rails; INTVCC powers gate drivers (50mA RMS), 3V8 powers control logic - simplifies BOM and layout. |
| Precision RUN pin with hysteresis | 1.22V enable threshold with 80mV hysteresis prevents oscillation during brown-in/brown-out; includes 0.5µA + 4.5µA pull-up for programmable delay. |
Applications
| Telecom Power Supply | Automotive ADAS Power |
|---|---|
Use Scenario: Generating isolated 48V bus from 12V vehicle battery for radar/LiDAR modules. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved inductor currents and synchronized gate timing to minimize EMI. Use Value: Achieves >94% efficiency at 5A output while meeting CISPR-25 Class 5 conducted emissions limits due to reduced ripple. | Use Scenario: High-reliability 48V intermediate bus in camera ECU supporting dynamic load steps up to 3A/µs. IC Role / Device Role / Timing Role: Current-mode controller with fast transient response (via ITH loop compensation) and programmable soft-start. Use Value: Maintains <±1% VOUT regulation during load transients; AEC-Q100 qualification ensures operation at 125°C junction. |
| Industrial PoE++ PSE | Test Equipment DC Source |
Use Scenario: 4-pair PoE++ power sourcing equipment delivering up to 90W per port with tight current matching. IC Role / Device Role / Timing Role: Multi-phase controller scaled to 4-phase via SYNC/CLKOUT daisy-chain; SENSE1+/SENSE2+ enable per-phase current monitoring. Use Value: ±10mV inter-channel current sense matching ensures balanced power delivery across all four pairs. | Use Scenario: Programmable bench power supply with 0–60V output and 0–10A current limit. IC Role / Device Role / Timing Role: Adjustable-frequency boost controller enabling low-noise, low-ripple output via optimized LC filter design. Use Value: 75kHz–500kHz frequency tuning allows trade-off between magnetic size (low f) and transient response (high f). |
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 functionality and pinout; rated for –40°C to +125°C junction temperature vs. LTC3862EUH#TRPBF's –40°C to +85°C. | Required for extended-temperature industrial or under-hood automotive use where ambient exceeds 85°C. | Select when thermal environment exceeds 85°C ambient or when higher reliability margin is mandated. |
| LTC3862-1EUH#TRPBF | Higher INTVCC UVLO (7.5V rising) and 10V gate drive - designed for standard-threshold MOSFETs instead of logic-level devices. | Used where VGS(th) > 3V MOSFETs are preferred for lower leakage or higher VDS rating; not compatible with 5V-gate logic-level FETs. | Choose only when replacing logic-level FETs with standard-threshold types; gate drive voltage and UVLO thresholds differ. |
Compared with LTC3862EUH#TRPBF, LTC3862IUH#TRPBF offers extended temperature operation without functional change, while LTC3862-1EUH#TRPBF shifts gate drive and UVLO to support non-logic-level MOSFETs - making them distinct functional alternatives rather than drop-in replacements.
Availability
LTC3862EUH#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive ADAS subsystems, and industrial PoE++ PSE equipment requiring stable component supply and long-term production continuity.
Supply support for LTC3862EUH#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 subsidiary of Analog Devices, Inc.) designs high-performance analog, mixed-signal, and digital signal processing ICs for precision, power, and RF applications.
The LTC3862 product line delivers multi-phase current-mode controllers for high-efficiency, high-reliability DC/DC conversion in telecom, automotive, and industrial power systems - emphasizing thermal robustness, synchronization flexibility, and integrated bias regulation.
FAQ
What is the maximum achievable output voltage using LTC3862EUH#TRPBF in boost configuration?
The LTC3862EUH#TRPBF itself does not impose a hard upper limit on VOUT; it is constrained by external component ratings and stability. In practice, designs achieving 48V output (as shown in typical application TA01) are validated. With proper MOSFET, diode, and capacitor selection - and adherence to max duty cycle (96%) and minimum on-time (180ns) constraints - outputs up to 60V are feasible. The LTC3862EUH#TRPBF's 36V VIN max and 40V absolute max rating on VIN also influence safe operating area.
Can LTC3862EUH#TRPBF be used in SEPIC topology, and what design changes are required?
Yes, the LTC3862EUH#TRPBF supports SEPIC operation per its datasheet description and functional diagram. Required changes include replacing the boost diode with a second coupling capacitor, adding a SEPIC transformer or coupled inductor, and adjusting compensation network values to account for different transfer function dynamics. The current sensing remains identical, and all control features - including PHASEMODE, SYNC, and DMAX - retain full functionality in SEPIC mode.
How does the PHASEMODE pin affect multi-phase operation beyond 2-phase configurations?
The PHASEMODE pin sets the relative phase shift between CH1 and CH2 (and CH1 and CLKOUT), enabling deterministic interleaving. For 3-, 4-, 6-, or 12-phase systems, multiple LTC3862EUH#TRPBF units are daisy-chained via SYNC and CLKOUT; PHASEMODE configures each device's local phase offset so that total system phase spacing is evenly distributed (e.g., 120° for 3-phase). The datasheet confirms this behavior applies identically to LTC3862EUH#TRPBF across all supported topologies.
Is the exposed pad (Pin 25) of LTC3862EUH#TRPBF electrically connected, and how must it be handled on the PCB?
Yes, the exposed pad (Pin 25) of LTC3862EUH#TRPBF is electrically connected to PGND and must be soldered to a dedicated PGND copper pour on the PCB. This connection is mandatory for both electrical integrity (providing low-impedance return path for gate drive and power ground currents) and thermal performance (RθJA = 44°C/W assumes full pad soldering). Failure to solder the pad degrades thermal dissipation and may cause premature thermal shutdown or reliability issues.
Does LTC3862EUH#TRPBF support pulse-skipping mode, and how is it enabled?
Yes, the LTC3862EUH#TRPBF supports pulse-skipping mode (PSKIP) at light loads to improve efficiency. It activates automatically when the ITH pin voltage falls below 0.275V (with 25mV hysteresis); no external configuration is required. During PSKIP, the controller skips switching cycles while maintaining output regulation via feedback loop holdoff. This behavior is inherent to the error amplifier architecture and applies identically to LTC3862EUH#TRPBF across all operating conditions and package variants.
LTC3862EUH#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (5x5)
LTC3862EUH#TRPBF FAQ
1.How can I place an order for LTC3862EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862EUH#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 LTC3862EUH#TRPBF reliable?
The price and inventory of LTC3862EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862EUH#TRPBF?
LTC3862EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862EUH#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 LTC3862EUH#TRPBF?
For technical support, including LTC3862EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862EUH#TRPBF requirements.
6.How does Aetrix verify that LTC3862EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862EUH#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 LTC3862EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862EUH#TRPBF?
All LTC3862EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862EUH#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 LTC3862EUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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