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Analog Devices Inc. LTC3862HGN-2#TRPBF
- Part No.:
- LTC3862HGN-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3862HGN-2#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,036
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Product details
Overview
LTC3862HGN-2#TRPBF from Analog Devices (formerly Linear Technology) is a two-phase, constant-frequency, peak current mode boost/SEPIC DC/DC controller driving external N-channel MOSFETs. It operates from 5.5V to 36V input, delivers up to 80V output, supports 75kHz–500kHz adjustable switching frequency, and features 10V INTVCC LDO with 4.4V UVLO rising threshold - used in high-voltage industrial power supplies requiring phase interleaving and tight output regulation.
For engineers reviewing the LTC3862HGN-2#TRPBF datasheet, LTC3862HGN-2#TRPBF pinout, LTC3862HGN-2#TRPBF application, or LTC3862HGN-2#TRPBF equivalent, key selection criteria include its H-grade (–40°C to 150°C) thermal rating, 24-lead narrow SSOP package, dual-channel phase control via PHASEMODE, programmable DMAX up to 96%, and precise ±1% internal voltage reference for stable 80V boost conversion.
Technical Context
The LTC3862HGN-2#TRPBF implements fixed-frequency peak current mode control with two independent channels operating 180° out-of-phase, reducing input/output ripple and filter component stress. Its cascaded LDO architecture supplies 10V (INTVCC) for gate drivers and 3.8V (3V8) for analog/digital circuitry, with separate PGND/SGND domains ensuring noise isolation.
Phase synchronization is achieved via PLL-based SYNC input (50kHz–650kHz), CLKOUT daisy-chaining, and PHASEMODE pin programming for 2-/3-/4-/6-/12-phase expansion. Slope compensation gain (via SLOPE pin), leading edge blanking (BLANK pin), and adjustable maximum duty cycle (DMAX pin) provide robust stability across wide VIN–VOUT ratios and load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Two-phase boost/SEPIC controller - enables interleaved operation to halve input/output capacitor RMS current and reduce EMI filtering requirements. |
| Input Voltage Range | 5.5V to 36V - supports wide-range industrial and telecom inputs including 12V, 24V, and 32V bus systems. |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable) - allows optimization of efficiency vs. size trade-offs; synchronized externally up to 650kHz. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable 80V output regulation in high-precision applications like laser drivers or test equipment. |
| UVLO Threshold | 4.4V (rising), 3.9V (falling) on INTVCC - protects gate drivers during brownout while enabling use of 6V-rated MOSFETs. |
| Max Duty Cycle | Programmable: 75% (to 3V8), 84% (floating), 96% (to SGND) - supports high step-up ratios (e.g., 12V→80V) without violating minimum off-time limits. |
| Junction Temp Range | –40°C to +150°C (H-grade) - qualified for under-hood automotive, industrial motor drives, and high-ambient embedded systems. |
| Package | 24-lead narrow SSOP (GN24) - thermally enhanced surface-mount package with 0.025" lead pitch, compatible with standard reflow profiles. |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN24), 0.025" lead pitch, exposed pad connected to PGND for thermal management. θJA = 85°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Maximum duty cycle control | Setting to SGND enables 96% max duty cycle - critical for high-ratio boost designs where minimum off-time would otherwise limit VOUT. |
| PHASEMODE (Pin 4) | Interleaving phase configuration | Floating sets CH1–CH2 at 180° - ensures optimal ripple cancellation in dual-phase boost; required for multi-phase scaling. |
| GATE1 / GATE2 (Pins 18, 16) | N-channel MOSFET gate drivers | 10V rail-to-rail outputs referenced to PGND - directly drive high-side N-MOSFETs without level-shifting in boost/SEPIC topologies. |
| SENSE1+/SENSE1− / SENSE2+/SENSE2− (Pins 23,22,13,14) | Current sense differential inputs | Measure source-side shunt voltage per channel - enables cycle-by-cycle peak current limiting and channel current matching within ±7mV. |
| INTVCC (Pin 19) | 10V gate driver LDO output | Bypassed with ≥4.7µF ceramic to PGND - powers gate drivers; UVLO protection prevents weak turn-on of high-voltage MOSFETs below 4.4V. |
| 3V8 (Pin 24) | 3.8V analog/digital LDO output | Bypassed with 1nF ceramic to SGND - supplies error amplifier, comparators, and logic; isolated from power ground to minimize noise coupling. |
| CLKOUT (Pin 10) | Phase-synchronized clock output | Drives SYNC input of adjacent LTC3862-2 devices - enables deterministic phase alignment across multiple controllers for >2-phase systems. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output capacitor RMS current by ~70% versus single-phase, lowering thermal stress and enabling smaller bulk capacitance. |
| Programmable slope compensation | SLOPE pin adjusts gain (0.625× to 1.66× nominal) - stabilizes current loop across varying duty cycles and inductor values in boost/SEPIC. |
| Adjustable leading edge blanking | BLANK pin selects 210ns (SGND), 290ns (float), or 375ns (3V8) - suppresses gate-drive-induced noise spikes during MOSFET turn-on. |
| Internal 1.223V precision reference | ±1% accuracy over –40°C to +150°C - eliminates need for external reference in feedback divider, improving long-term output voltage stability. |
| H-grade temperature qualification | Guaranteed operation from –40°C to +150°C junction - suitable for engine bay, industrial enclosures, and high-power density converters without derating. |
| Multi-phase scalability | SYNC/CLKOUT/PHASEMODE pins support 2-, 3-, 4-, 6-, or 12-phase configurations - enables modular power system design with shared feedback and synchronized clocks. |
Applications
| Industrial High-Voltage Power Supply | Telecom 48V Boost Converter |
|---|---|
Use Scenario: Generating regulated 80V from 24V industrial bus for PLC I/O modules and sensor excitation circuits. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved gate timing, current sensing, and soft-start sequencing. Use Value: Reduces 120Hz output ripple by >50% and cuts input capacitor size by 40% compared to single-phase implementation. | Use Scenario: Stepping up -48V telecom supply to +80V for optical transceiver bias rails in base station equipment. IC Role / Device Role / Timing Role: SEPIC controller with phase-shifted switching to maintain regulation during input voltage dips and load transients. Use Value: Achieves 95% peak efficiency at 7A output while meeting EN55022 Class B conducted EMI limits via interleaved spectrum spreading. |
| Automotive LED Driver | Test Equipment HV Source |
Use Scenario: Driving high-brightness LED arrays in vehicle headlamps requiring 60–80V constant-current output from 12V battery. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller regulating LED current via ITH feedback and SENSE+/- monitoring. Use Value: H-grade thermal rating ensures reliable operation at 125°C ambient; programmable DMAX prevents overvoltage during cold cranking. | Use Scenario: Programmable HV source in automated test equipment needing stable 80V output with <0.1% line/load regulation. IC Role / Device Role / Timing Role: Precision boost controller using internal 1.223V reference and matched current sense channels for accurate current limiting. Use Value: ±1% FB reference and <±7mV channel matching enable <0.2% output voltage drift over temperature and load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862IGN-2#TRPBF | I-grade (–40°C to +125°C) vs H-grade (–40°C to +150°C); identical electrical specs and pinout. | Not rated for sustained operation above 125°C junction - unsuitable for under-hood or high-power-density industrial enclosures. | Select only if ambient temperature remains ≤105°C and thermal margin is verified. |
| LTC3862HUH-2#TRPBF | Same H-grade rating but in 5mm × 5mm QFN (UH24) package with θJA = 44°C/W vs SSOP's 85°C/W. | Superior thermal performance enables higher continuous output current in space-constrained layouts. | Prefer when PCB real estate is limited and thermal management prioritized over legacy SSOP footprint compatibility. |
Compared with LTC3862IGN-2#TRPBF, the LTC3862HGN-2#TRPBF provides extended high-temperature operation essential for automotive and industrial environments; versus LTC3862HUH-2#TRPBF, it retains legacy SSOP compatibility while trading thermal efficiency for board-level assembly familiarity.
Availability
LTC3862HGN-2#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, telecom boost converters, and automotive LED drivers requiring stable component supply, full H-grade qualification, and long-term lifecycle support.
Supply support for LTC3862HGN-2#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 analog and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3862 family is designed for high-efficiency, multi-phase boost and SEPIC DC/DC conversion in demanding environments - emphasizing thermal robustness, precise current sensing, and scalable phase synchronization.
FAQ
What is the maximum output voltage achievable with the LTC3862HGN-2#TRPBF in boost topology?
The LTC3862HGN-2#TRPBF itself does not impose a hard upper limit on output voltage; instead, it controls external MOSFETs and diodes. In typical applications, it reliably regulates up to 80V output (as validated in the datasheet's efficiency curves), constrained by external component ratings, layout parasitics, and stability margins. The 96% maximum duty cycle (via DMAX pin to SGND) supports high step-up ratios such as 12V→80V, provided minimum off-time and slope compensation are properly configured for the chosen inductor and switching frequency.
How does the PHASEMODE pin affect channel timing in the LTC3862HGN-2#TRPBF?
The PHASEMODE pin on the LTC3862HGN-2#TRPBF directly configures the phase relationship between Channel 1 and Channel 2 gate signals: floating or tied to 3V8 sets 180° separation (optimal for ripple cancellation), while tying to SGND sets 120°. This setting also determines CH1-to-CLKOUT phase offset (e.g., 90° when floating). These relationships are critical for deterministic multi-phase synchronization and must match across all LTC3862HGN-2#TRPBF devices in a daisy-chained system to avoid beat frequencies and current imbalance.
Can the LTC3862HGN-2#TRPBF be used in SEPIC topology, and what design considerations apply?
Yes, the LTC3862HGN-2#TRPBF supports SEPIC topology using both channels - one for the main switch and one for the coupled inductor auxiliary switch. Key considerations include configuring SLOPE compensation for discontinuous conduction mode (DCM) behavior, ensuring matched current sense resistors across channels, and verifying that the 3.8V LDO (3V8) adequately powers the auxiliary switch driver circuitry. The datasheet's typical application schematic confirms SEPIC operation with 24V input to 80V output, validating its capability beyond pure boost.
What is the purpose of the BLANK pin on the LTC3862HGN-2#TRPBF, and how does it impact minimum on-time?
The BLANK pin on the LTC3862HGN-2#TRPBF controls leading edge blanking duration to suppress false current-sense triggering during MOSFET turn-on. Connecting BLANK to SGND sets minimum on-time to 210ns (for high-frequency, low-duty-cycle operation), floating yields 290ns (default), and tying to 3V8 extends it to 375ns (for improved noise immunity at lower frequencies). This adjustment directly affects minimum achievable duty cycle and must be coordinated with FREQ resistor value and inductor selection to avoid pulse-skipping or instability.
Does the LTC3862HGN-2#TRPBF require external compensation components, and where are they connected?
Yes, the LTC3862HGN-2#TRPBF requires external Type II or Type III compensation on the ITH pin to stabilize the current-mode control loop. A series RC network (typically 10kΩ + 1nF) connects between ITH and SGND, while a feedforward capacitor (e.g., 100pF) may be added from ITH to FB for improved transient response. Compensation values depend on output capacitance, ESR, inductance, and desired crossover frequency - the datasheet's "Compensation Design" section provides step-by-step calculation methods specific to the LTC3862HGN-2#TRPBF's transconductance amplifier and error amplifier characteristics.
LTC3862HGN-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- 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):
- 5.5V ~ 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-SSOP
LTC3862HGN-2#TRPBF FAQ
1.How can I place an order for LTC3862HGN-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862HGN-2#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 LTC3862HGN-2#TRPBF reliable?
The price and inventory of LTC3862HGN-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862HGN-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862HGN-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862HGN-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862HGN-2#TRPBF?
LTC3862HGN-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862HGN-2#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 LTC3862HGN-2#TRPBF?
For technical support, including LTC3862HGN-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862HGN-2#TRPBF requirements.
6.How does Aetrix verify that LTC3862HGN-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862HGN-2#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 LTC3862HGN-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862HGN-2#TRPBF?
All LTC3862HGN-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862HGN-2#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 LTC3862HGN-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862HGN-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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