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Analog Devices Inc. LTC3862HFE-2#PBF
- Part No.:
- LTC3862HFE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3862HFE-2#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,672
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Product details
Overview
LTC3862HFE-2#PBF from Analog Devices (formerly Linear Technology) is a two-phase, constant-frequency, peak current mode boost/SEPIC DC/DC controller driving N-channel MOSFETs for high-voltage step-up conversion. It operates from 5.5V to 36V input, delivers up to 80V output, supports 75kHz–500kHz programmable switching frequency, and features 10V INTVCC LDO with 4.4V UVLO rising threshold - optimized for automotive and industrial 48V-to-60V+ power systems.
For engineers reviewing the LTC3862HFE-2#PBF datasheet, LTC3862HFE-2#PBF pinout, LTC3862HFE-2#PBF application, or LTC3862HFE-2#PBF equivalent, key selection criteria include its H-grade (–40°C to +150°C) thermal rating, 24-pin TSSOP package with exposed PGND pad, dual-channel phase control via PHASEMODE, and precise 96% max duty cycle programming at DMAX = SGND.
Technical Context
The LTC3862HFE-2#PBF 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 architecture includes cascaded LDOs: a 10V INTVCC regulator powering gate drivers and a 3.8V LDO supplying analog/digital circuitry, both thermally isolated and independently bypassed.
Phase synchronization is achieved via PLL-based SYNC input (50kHz–650kHz), CLKOUT daisy-chaining, and PHASEMODE-selectable channel relationships (120°/180°). 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 and load ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 36V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable) - enables optimization of efficiency vs. size for high-voltage boost inductors and capacitors. |
| INTVCC UVLO Threshold | Rising: 4.4V, Falling: 3.9V - ensures reliable gate drive enable/disable for 6V-VGS-rated high-voltage MOSFETs. |
| Max Duty Cycle | 96% (DMAX = SGND), 84% (floating), 75% (DMAX = 3V8) - supports high step-up ratios (e.g., 12V→80V) while maintaining timing precision. |
| Current Sense Threshold | 65mV to 85mV (temperature- and duty-cycle-dependent) - sets accurate peak current limit with ±7mV CH1–CH2 matching for balanced phase current sharing. |
| Junction Temp Range | –40°C to +150°C (H-grade) - qualified for under-hood automotive, industrial motor drives, and high-ambient telecom rectifiers. |
| Reference Voltage | 1.223V ±1% (E/I/H grades) - provides stable feedback accuracy for precise VOUT regulation across temperature and line variations. |
Pinout & Package
Package: 24-lead plastic TSSOP (FE24) with exposed PGND pad (Pin 25), θJA = 38°C/W. Exposed pad must be soldered to PCB ground for thermal and electrical performance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Maximum duty cycle programming | SGND = 96%, floating = 84%, 3V8 = 75% - enables precise control of voltage conversion ratio and minimum off-time. |
| PHASEMODE (Pin 4) | Interleaved phase relationship selector | SGND/floating/3V8 configures CH1–CH2 as 180°/180°/120° and CH1–CLKOUT as 90°/60°/240° - critical for multi-phase scalability. |
| GATE1/GATE2 (Pins 18/16) | N-channel MOSFET gate drivers | 10V rail-referenced outputs with 3Ω pull-up / 0.9Ω pull-down - directly drives high-Qg MOSFETs without external buffers. |
| SENSE1+/SENSE2+ (Pins 23/13) | Positive current sense inputs | Differential inputs to peak current comparators - used with low-value sense resistors (e.g., 3.3mΩ) for accurate per-phase current limiting. |
| PGND (Pin 17 + Exposed Pad 25) | Power ground return | Electrically isolated from SGND; must connect to MOSFET source nodes and INTVCC capacitor negative terminal - essential for noise immunity and thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output RMS current by ~30%, enabling smaller input capacitors and lower ESR output caps in 80V boost designs. |
| Programmable slope compensation (SLOPE pin) | Floating = 1.0×, SGND = 0.625×, 3V8 = 1.66× normalized gain - stabilizes current mode control across varying duty cycles and inductor values. |
| Adjustable leading edge blanking (BLANK pin) | 210ns (BLANK = SGND), 290ns (floating), 375ns (BLANK = 3V8) - suppresses switch-node noise during MOSFET turn-on without compromising minimum on-time. |
| Internal 10V/3.8V dual-LDO architecture | Eliminates need for external bias rails; INTVCC powers gate drivers, 3V8 powers error amp/PLL/oscillator - improves system integration and startup reliability. |
| SYNC/CLKOUT for multi-phase expansion | Supports 2-, 3-, 4-, 6-, or 12-phase configurations using daisy-chained CLKOUT and synchronized PLL - scalable for >100A high-power supplies. |
Applications
| Automotive 48V Start-Stop Systems | Industrial Telecom Rectifiers |
|---|---|
|
Use Scenario: Boosting 48V battery rail to 60–80V for active suspension, e-turbo, or high-power infotainment. IC Role / Device Role / Timing Role: Two-phase current-mode controller managing parallel MOSFETs with synchronized gate drive and thermal-aware duty cycling. Use Value: Achieves >95% efficiency at 7A output while meeting AEC-Q100 H-grade temp requirements and minimizing input capacitor count. |
Use Scenario: Converting –48V telecom supply to +80V for legacy optical line cards requiring higher bias voltage. IC Role / Device Role / Timing Role: SEPIC controller operating in continuous conduction mode with precise 1.223V reference and ±1% FB accuracy. Use Value: Enables single-stage conversion without transformer isolation, reducing BOM cost and board area versus flyback solutions. |
| High-Voltage LED Drivers | Test Equipment Power Supplies |
|
Use Scenario: Driving series-connected high-brightness LED strings requiring 72V–80V at up to 7A in medical imaging or stage lighting. IC Role / Device Role / Timing Role: Constant-current boost controller using ITH-based current loop with programmable soft-start and overvoltage lockout. Use Value: Provides smooth dimming transition, tight current regulation (<±2%), and fault protection against open-circuit LED failure. |
Use Scenario: Programmable lab power supply output stage delivering 0–80V, 0–7A with fast transient response and remote sensing. IC Role / Device Role / Timing Role: Precision-controlled two-phase boost core with adjustable frequency, slope compensation, and multi-unit synchronization. Use Value: Supports <100µs load-step recovery and <0.1% line/load regulation via high-gain error amplifier (660 µMho) and low-drift reference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar two-phase boost/SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862IFE-2#PBF | I-grade (–40°C to +125°C), identical electrical specs and pinout | Suitable for under-dash automotive or industrial enclosures where ambient ≤125°C | Select when full H-grade thermal margin is unnecessary and cost optimization is prioritized. |
| LTC3862HUH-2#PBF | Same H-grade rating but in 5mm × 5mm QFN (UH24) with θJA = 44°C/W and 0.65mm pitch | Better thermal performance in space-constrained layouts; requires different PCB footprint and reflow profile | Choose for higher power density designs needing lower junction rise per watt, accepting QFN assembly complexity. |
Compared with LTC3862IFE-2#PBF, the LTC3862HFE-2#PBF offers extended high-temperature operation critical for engine bay proximity; versus LTC3862HUH-2#PBF, it trades thermal resistance for mature TSSOP assembly compatibility and lower cost per unit in medium-volume production.
Availability
LTC3862HFE-2#PBF is available at Aetrix Electronics and suitable for automotive power conversion, industrial telecom rectification, and high-voltage LED driver applications requiring stable component supply and long-term lifecycle support.
Supply support for LTC3862HFE-2#PBF 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 full product support, documentation, and manufacturing continuity for all Linear power ICs.
The LTC3862 family was designed specifically for high-efficiency, multi-phase, high-voltage boost and SEPIC DC/DC conversion in demanding environments - emphasizing thermal robustness, precise current sensing, and flexible phase synchronization.
FAQ
What is the operating temperature range of the LTC3862HFE-2#PBF?
The LTC3862HFE-2#PBF is rated for a junction temperature range of –40°C to +150°C, making it suitable for under-hood automotive applications and high-ambient industrial environments. This H-grade qualification is verified per manufacturer specifications and includes guaranteed performance across the full range, not just design correlation.
How does the DMAX pin affect duty cycle in the LTC3862HFE-2#PBF?
The DMAX pin on the LTC3862HFE-2#PBF programs the maximum duty cycle: connecting it to SGND yields 96%, leaving it floating gives 84%, and tying it to 3V8 sets 75%. This setting is derived from an internal 12× clock and remains highly precise across temperature and line variations - critical for stable high-ratio boost operation in the LTC3862HFE-2#PBF.
Can the LTC3862HFE-2#PBF synchronize to an external clock?
Yes, the LTC3862HFE-2#PBF supports PLL-based synchronization via its SYNC pin, accepting external clocks from 50kHz to 650kHz. The rising edge of SYNC aligns with GATE1's rising edge in closed-loop operation, enabling precise multi-phase alignment across multiple LTC3862HFE-2#PBF controllers in stacked or distributed power architectures.
What is the purpose of the exposed pad on the LTC3862HFE-2#PBF package?
The exposed pad (Pin 25) on the LTC3862HFE-2#PBF is electrically connected to PGND and must be soldered to the PCB ground plane. It serves dual functions: lowering thermal resistance (θJA = 38°C/W) and providing low-inductance power ground return for gate drivers and high-current sense paths - both essential for stable operation and EMI control in the LTC3862HFE-2#PBF.
Does the LTC3862HFE-2#PBF require external components for gate driving?
No, the LTC3862HFE-2#PBF integrates 10V gate drivers on GATE1 and GATE2 with 3Ω pull-up and 0.9Ω pull-down strength, capable of directly driving N-channel MOSFETs with QG up to ~50nC. For higher QG devices, increasing the INTVCC bypass capacitance to ≥10µF is recommended - no external driver ICs are needed in standard implementations of the LTC3862HFE-2#PBF.
LTC3862HFE-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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-TSSOP
LTC3862HFE-2#PBF FAQ
1.How can I place an order for LTC3862HFE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862HFE-2#PBF 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 LTC3862HFE-2#PBF reliable?
The price and inventory of LTC3862HFE-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862HFE-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862HFE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862HFE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862HFE-2#PBF?
LTC3862HFE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862HFE-2#PBF 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 LTC3862HFE-2#PBF?
For technical support, including LTC3862HFE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862HFE-2#PBF requirements.
6.How does Aetrix verify that LTC3862HFE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862HFE-2#PBF 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 LTC3862HFE-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862HFE-2#PBF?
All LTC3862HFE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862HFE-2#PBF, 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 LTC3862HFE-2#PBF part is unused and in its original packaging.
Return procedure for LTC3862HFE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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