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Analog Devices Inc. LTC3862HGN-2#PBF
- Part No.:
- LTC3862HGN-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3862HGN-2#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,153
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Product details
Overview
LTC3862HGN-2#PBF 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 internal 10V/3.8V LDOs, programmable duty cycle (75–96%), and 180° phase shift for reduced input/output ripple - used in high-voltage telecom power supplies and industrial boost converters.
For engineers reviewing the LTC3862HGN-2#PBF datasheet, LTC3862HGN-2#PBF pinout, LTC3862HGN-2#PBF application, or LTC3862HGN-2#PBF equivalent, key selection criteria include its H-grade (–40°C to 150°C) thermal rating, 24-lead narrow SSOP package with exposed PGND pad, dual-channel current sensing with ±7mV matching, and phase-lockable SYNC/CLKOUT architecture enabling 2-/3-/4-/6-/12-phase scaling.
Technical Context
The LTC3862HGN-2#PBF implements fixed-frequency peak current mode control with two independent channels operating 180° out-of-phase. Its error amplifier compares FB voltage against a ±1% 1.223V reference and drives ITH to modulate peak inductor current; slope compensation gain is programmable via SLOPE pin (0.625× to 1.66× nominal).
It integrates cascaded LDOs: a 10V INTVCC regulator (4.4V UVLO rising, 3.9V falling) powers gate drivers, and a 3.8V 3V8 LDO supplies analog/digital circuitry. Phase relationships are controlled by PHASEMODE (0V/float/3V8), while DMAX sets max duty cycle (75%/84%/96%) and BLANK configures minimum on-time (210/290/375ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Two-phase boost or 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) + 50kHz–650kHz PLL-sync range - allows noise-sensitive system clock alignment and EMI optimization. |
| Max Duty Cycle | 75% / 84% / 96% (via DMAX pin at 3V8 / float / SGND) - enables precise control of high-step-up ratios (e.g., 12V→80V) without instability. |
| Current Sense Threshold | 65mV to 85mV (typ. 75mV), ±7mV CH1–CH2 matching - ensures accurate current balancing across phases in multi-phase designs. |
| Operating Temperature | –40°C to +150°C (H-grade) - qualified for under-hood automotive, industrial motor drives, and high-ambient telecom rectifiers. |
| Reference Accuracy | ±1% over temperature - guarantees tight output voltage regulation (e.g., 80V ±0.8V) without external trimming. |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN24), 0.25-inch lead pitch, exposed PGND pad (Pin 25) requiring solder connection to PCB ground for thermal and electrical performance (θJA = 85°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Maximum duty cycle programming | Setting to SGND enables 96% max duty cycle for highest step-up ratio applications; float yields 84%, 3V8 yields 75% for improved stability margin. |
| PHASEMODE (Pin 4) | Inter-channel phase configuration | Float or 3V8 selects 180° CH1–CH2 phase shift; SGND selects 120° - critical for 3-phase extension using CLKOUT daisy-chaining. |
| BLANK (Pin 3) | Minimum on-time control | SGND = 210ns (supports high-frequency/high-VIN designs); float = 290ns (default); 3V8 = 375ns (improves light-load stability). |
| SENSE1+/SENSE2+ (Pins 23/13) | Positive current sense inputs | Connect to high-side source of each N-MOSFET; enable per-phase current limiting and accurate current-mode control with <±7mV matching. |
| PGND (Pin 17 + Exposed Pad Pin 25) | Power ground return | Mandatory low-impedance connection to MOSFET source nodes and INTVCC bypass capacitors - separates power and signal grounds to prevent noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output capacitor RMS current by ~70% vs single-phase, enabling smaller, lower-cost bulk capacitance in high-power boost converters. |
| Programmable slope compensation | SLOPE pin adjusts gain (0.625× to 1.66×) to stabilize current mode control across wide duty cycles and inductance variations - prevents subharmonic oscillation. |
| Internal 10V/3.8V dual-LDO system | Eliminates need for external bias rails; 10V INTVCC drives logic-level or 6VGSS MOSFETs directly; 3.8V 3V8 powers precision analog blocks with dedicated 1nF bypass. |
| H-grade temperature qualification | Guaranteed operation from –40°C to +150°C junction - supports placement near heat sources (e.g., power inductors, transformers) in industrial and automotive environments. |
| SYNC/CLKOUT multi-phase expansion | Enables seamless scaling to 3-, 4-, 6-, or 12-phase systems using daisy-chained CLKOUT outputs and PHASEMODE-configured phase offsets - no external timing IC required. |
Applications
| Telecom Rectifier Modules | Industrial High-Voltage Bias Supplies |
|---|---|
Use Scenario: Generating stable 48V or 80V DC from 12V/24V battery or PoE-derived input in telecom shelf power systems. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel MOSFETs, synchronizing to system clock via SYNC, and regulating output with ±1% reference accuracy. Use Value: Interleaving cuts input ripple current by >65%, reducing EMI filter size and cost while meeting GR-1089 Class B emissions limits. |
Use Scenario: Providing isolated 60–100V bias for IGBT gate drivers or op-amp front-ends in factory automation PLCs and motor controllers. IC Role / Device Role / Timing Role: SEPIC controller delivering regulated high-voltage output with input-to-output isolation, leveraging internal 10V LDO for robust gate drive. Use Value: 150°C H-grade rating allows direct mounting on heatsinks or near power stages, eliminating remote thermal derating and simplifying thermal design. |
| Automotive LED Driver Power Stages | Test Equipment High-Voltage Sources |
Use Scenario: Driving long strings of high-brightness LEDs (e.g., headlight modules) from 12V vehicle battery with dimming control. IC Role / Device Role / Timing Role: Constant-current boost controller using ITH feedback loop and programmable leading-edge blanking to reject MOSFET switching noise. Use Value: Adjustable BLANK pin (210–375ns) suppresses false current-sense triggering during fast MOSFET turn-on, ensuring stable dimming down to 0.1% PWM. |
Use Scenario: Programmable DC source in automated test equipment requiring precise 30–80V outputs with fast transient response. IC Role / Device Role / Timing Role: Digitally controlled boost controller with soft-start (SS pin), RUN enable, and SYNC lock to system master clock for synchronized sequencing. Use Value: 5µA SS current source and 4.5µA RUN hysteresis enable repeatable, jitter-free power-up timing across production units - critical for ATE calibration repeatability. |
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#PBF | I-grade (–40°C to +125°C), same pinout and electrical specs | Lower max junction temperature rating - suitable for non-under-hood automotive or industrial enclosures with active cooling. | Select when thermal margin exists and cost sensitivity favors standard grade over H-grade. |
| LTC3862HUH-2#PBF | Same H-grade temp range but in 5mm × 5mm QFN (UH24) with θJA = 44°C/W | Superior thermal performance and smaller footprint - requires different PCB layout and reflow profile vs SSOP. | Choose for space-constrained, high-power-density designs where thermal resistance must be minimized below 60°C/W. |
Compared with LTC3862IGN-2#PBF, the LTC3862HGN-2#PBF adds 25°C higher junction tolerance for passive-cooled deployments; versus LTC3862HUH-2#PBF, it trades thermal efficiency for legacy SSOP compatibility and simplified assembly in through-hole or mixed-technology boards.
Availability
LTC3862HGN-2#PBF is available at Aetrix Electronics and suitable for telecom rectifier modules, industrial high-voltage bias supplies, and automotive LED driver power stages requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3862HGN-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 support for its high-performance power management portfolio, including precision DC/DC controllers and monolithic regulators.
The LTC3862 family was designed for high-efficiency, high-voltage boost and SEPIC applications demanding tight regulation, multi-phase scalability, and robust operation across harsh industrial and automotive environments - with LTC3862HGN-2#PBF targeting the most thermally demanding implementations.
FAQ
What is the maximum output voltage achievable with the LTC3862HGN-2#PBF in a boost configuration?
The LTC3862HGN-2#PBF itself does not impose a hard upper limit on output voltage; instead, it depends on external component ratings and layout. The typical application shown in the datasheet achieves 80V output with 7A load. With appropriately rated MOSFETs (e.g., 100V VDSS), diodes, and output capacitors, designs exceeding 100V are feasible - though duty cycle constraints (max 96%) and minimum on-time (210ns) must be verified for stability at extreme step-up ratios.
Does the LTC3862HGN-2#PBF support SEPIC topology, and what modifications are needed versus boost?
Yes, the LTC3862HGN-2#PBF supports SEPIC operation using the same pin connections as boost mode. The key difference is in the power stage: replace the boost diode with a second inductor and add a coupling capacitor between the switch node and output. The controller's current sensing, gate drive, and feedback remain identical - only the external magnetics and capacitor network change to provide non-inverting conversion with inherent input-output isolation.
How does the PHASEMODE pin affect synchronization when multiple LTC3862HGN-2#PBF devices are used?
When multiple LTC3862HGN-2#PBF controllers are daisy-chained, the PHASEMODE pin determines relative phase alignment. With PHASEMODE tied to SGND, CH1 and CH2 operate 120° apart - enabling three-phase operation when CLKOUT from one device drives SYNC of the next. This allows precise 120° or 90° offsets across up to 12 phases without external phase-shift circuits or timing ICs.
What is the purpose of the 3V8 pin, and can it power external circuitry?
The 3V8 pin is the output of an internal LDO powered from INTVCC, providing a regulated 3.8V supply exclusively for the LTC3862HGN-2#PBF's internal analog and digital circuitry. It is not rated to drive external loads - the datasheet explicitly states it "is not intended to be used as a supply for external circuitry." External circuits requiring 3.3V or 3.8V should use a dedicated regulator to avoid noise coupling and regulation errors.
Can the LTC3862HGN-2#PBF be used with logic-level MOSFETs, and what gate drive voltage does it provide?
The LTC3862HGN-2#PBF provides a 10V gate drive (INTVCC) referenced to PGND, optimized for MOSFETs rated at 6V VGS. While it can drive many logic-level devices, the 10V output may exceed the absolute maximum VGS rating of some ultra-low-threshold MOSFETs (e.g., those rated for 5V max). Always verify VGS(max) ≥ 10V or use a level-shifting gate driver if required - the controller itself does not regulate or clamp gate voltage.
LTC3862HGN-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- 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-SSOP
LTC3862HGN-2#PBF FAQ
1.How can I place an order for LTC3862HGN-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862HGN-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 LTC3862HGN-2#PBF reliable?
The price and inventory of LTC3862HGN-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 LTC3862HGN-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862HGN-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862HGN-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862HGN-2#PBF?
LTC3862HGN-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862HGN-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 LTC3862HGN-2#PBF?
For technical support, including LTC3862HGN-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862HGN-2#PBF requirements.
6.How does Aetrix verify that LTC3862HGN-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862HGN-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 LTC3862HGN-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862HGN-2#PBF?
All LTC3862HGN-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862HGN-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 LTC3862HGN-2#PBF part is unused and in its original packaging.
Return procedure for LTC3862HGN-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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