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Analog Devices Inc. LTC3862HUH-2#PBF
- Part No.:
- LTC3862HUH-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WQFN Exposed Pad
- Datasheet:
-
LTC3862HUH-2#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,699
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Product details
Overview
LTC3862HUH-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, features 10V INTVCC LDO with 4.4V UVLO+, and is rated for –40°C to +150°C junction temperature in a thermally enhanced 24-lead 5mm × 5mm QFN package. It enables high-efficiency telecom and industrial boost supplies.
For engineers reviewing the LTC3862HUH-2#PBF datasheet, LTC3862HUH-2#PBF pinout, LTC3862HUH-2#PBF application, or LTC3862HUH-2#PBF equivalent, key selection criteria include its dual-phase current-mode architecture, programmable maximum duty cycle (75–96%), phase-synchronization capability via SYNC/CLKOUT, internal 1.223V ±1% reference, and thermal grade H (–40°C to 150°C) qualification.
Technical Context
The LTC3862HUH-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 error amplifier compares FB voltage against a precision 1.223V reference and drives ITH to modulate peak inductor current per channel.
It integrates two cascaded PMOS LDOs: a 10V INTVCC regulator (4.4V rising UVLO, 50mA RMS output) powering gate drivers, and a 3.8V 3V8 regulator (bypassed with 1nF) powering analog/digital circuitry. Phase relationships (CH1/CH2, CH1/CLKOUT) are configurable via PHASEMODE pin voltage (0V/float/3.8V), enabling 2-/3-/4-/6-/12-phase multi-controller systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 36V - supports wide-range industrial and telecom inputs including 12V, 24V, and 32V rails. |
| Switching Frequency | 75kHz to 500kHz - set by single resistor on FREQ pin; enables optimization of size vs. efficiency trade-offs. |
| Max Duty Cycle | 75% / 84% / 96% - selected by DMAX pin voltage (3.8V/float/SGND); critical for high-step-up ratio designs. |
| Reference Voltage | 1.223V ±1% - high-accuracy FB threshold enabling precise output voltage regulation at VOUT = 1.223V × (1 + R1/R2). |
| INTVCC UVLO Threshold | 4.4V (rising), 3.9V (falling) - ensures robust gate drive enablement for 6V-rated MOSFETs in high-voltage boost stages. |
| Operating Temperature | –40°C to +150°C - qualified for under-hood automotive, industrial power, and high-ambient telecom applications. |
| Package | 24-lead 5mm × 5mm QFN (UH), exposed PGND pad - θJA = 44°C/W; requires soldered thermal pad for rated performance. |
Pinout & Package
Package: 24-lead (5mm × 5mm) plastic QFN (UH), exposed thermal pad connected to PGND. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE1, GATE2 | High-side N-MOS gate drivers | 10V rail-referenced outputs (to PGND); drive external high-voltage MOSFETs with 3Ω pull-up / 0.9Ω pull-down RDS(ON). |
| SENSE1+, SENSE2+ | Current sense positive inputs | Connect to top of current sense resistors; trip threshold is 65–85mV (typ. 75mV) with ±7mV matching between channels. |
| SENSE1–, SENSE2– | Current sense negative inputs | Return to bottom of sense resistors; differential sensing enables accurate peak current limiting per phase. |
| FB | Error amplifier inverting input | Connected to resistive divider from VOUT; regulates output using internal 1.223V reference. |
| ITH | Error amplifier output / current limit control | Directly sets peak current comparator threshold; also used for loop compensation network connection. |
| DMAX | Duty cycle limit programming | SGND = 96%, float = 84%, 3.8V = 75%; derived from 12× internal clock for precise timing control. |
| PHASEMODE | Interleaving phase configuration | 0V/float/3.8V selects 180°/180°/120° CH1–CH2 relationship and 90°/60°/240° CH1–CLKOUT alignment. |
| SYNC, CLKOUT | Multi-phase synchronization interface | Accepts 50–650kHz external clock on SYNC; outputs phase-aligned clock on CLKOUT for daisy-chaining. |
| INTVCC | 10V gate driver supply output | Bypass with ≥4.7µF ceramic to PGND; includes UVLO (4.4V rise) to prevent weak MOSFET turn-on. |
| 3V8 | 3.8V analog/digital supply output | Bypass with 1nF ceramic to SGND; powers internal comparators, logic, and reference circuits only. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output capacitor RMS current by ~30% and cuts EMI filtering requirements versus single-phase designs. |
| Programmable slope compensation | SLOPE pin (float/3.8V/SGND) adjusts gain by 0%/+66%/–37.5%, stabilizing current mode control across varying duty cycles. |
| Adjustable leading edge blanking | BLANK pin (SGND/float/3.8V) sets minimum on-time to 210ns/290ns/375ns, suppressing gate-drive noise during switch turn-on. |
| Precision RUN pin with hysteresis | 1.22V enable threshold with 80mV hysteresis prevents oscillation during brown-in/brown-out conditions. |
| Internal 10V LDO with UVLO | Eliminates need for external bias supply while ensuring reliable gate drive for 6V-VGS MOSFETs in high-step-up converters. |
Applications
| Telecom Power Supply | Industrial Boost Converter |
|---|---|
Use Scenario: Generating 48V or 80V from 24V or 32V intermediate bus in 48V PoE++ or remote radio units. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel MOSFETs, synchronizing phases to reduce input ripple and improve transient response. Use Value: Enables compact, high-efficiency (>95% at 7A) 80V output with reduced input capacitance and lower EMI emissions. |
Use Scenario: Stepping up 12V battery or 24V factory bus to 60–100V for motor drives, sensors, or HV bias rails. IC Role / Device Role / Timing Role: Dual-channel current-mode controller supporting SEPIC or boost topology with programmable max duty cycle for wide VIN–VOUT ratios. Use Value: Delivers stable high-voltage output across –40°C to +150°C ambient with integrated LDOs eliminating external bias complexity. |
| Automotive ADAS Power | Test Equipment HV Source |
Use Scenario: Providing isolated 60V/1A supply for radar transceivers or LiDAR modules in engine bay or under-hood locations. IC Role / Device Role / Timing Role: High-temp-rated boost controller operating in harsh thermal environments; uses PHASEMODE and SYNC for system-level phase coordination. Use Value: Qualified to 150°C junction temperature with robust UVLO and thermal shutdown, ensuring reliability in uncooled enclosures. |
Use Scenario: Programmable HV bench supply for validating op-amps, ADCs, or sensor interfaces requiring 30–80V bias. IC Role / Device Role / Timing Role: Precision-controlled boost controller with ±1% reference and soft-start (SS pin) for repeatable, low-stress startup sequencing. Use Value: Achieves <1% output voltage accuracy and smooth ramp-up without overshoot, simplifying calibration and safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862IUH-2#PBF | Same silicon, rated for –40°C to +125°C (I-grade) instead of –40°C to +150°C (H-grade). | Not qualified for sustained 150°C junction operation; unsuitable for under-hood or high-ambient industrial use. | Select only if thermal margin allows full derating below 125°C; otherwise LTC3862HUH-2#PBF is required. |
| LTC3862EUH-2#PBF | Same silicon, rated for –40°C to +85°C (E-grade); lower cost but narrower temperature range. | Restricted to commercial/indoor environments; lacks extended thermal qualification for automotive or telecom infrastructure. | Use only in controlled ambient applications where junction temperature remains ≤85°C; not drop-in for H-grade designs. |
Compared with LTC3862IUH-2#PBF and LTC3862EUH-2#PBF, the LTC3862HUH-2#PBF provides guaranteed operation up to 150°C junction temperature, making it the sole choice for thermally demanding boost applications where long-term reliability at elevated temperatures is mandatory.
Availability
LTC3862HUH-2#PBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial boost converters, and automotive ADAS power systems requiring stable component supply with extended temperature qualification and traceable sourcing.
Supply support for LTC3862HUH-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and healthcare markets.
The LTC3862 family is designed specifically for high-efficiency, multi-phase step-up DC/DC conversion in space-constrained, thermally demanding applications-emphasizing precision control, thermal resilience, and flexible phase synchronization.
FAQ
What is the maximum output voltage achievable with the LTC3862HUH-2#PBF?
The LTC3862HUH-2#PBF itself does not impose a hard upper limit on output voltage; it is a controller, not a regulator. In typical boost configurations, the LTC3862HUH-2#PBF has been validated to generate stable 80V outputs (e.g., 6V–32V input to 80V/7A). Output voltage is determined by external components-inductor, diode, MOSFET voltage rating, and feedback divider-and must respect the absolute maximum ratings of all associated parts. The controller's 10V INTVCC LDO and gate drivers support MOSFETs rated for ≥100V VDS.
Does the LTC3862HUH-2#PBF support SEPIC topology in addition to boost?
Yes, the LTC3862HUH-2#PBF supports both boost and SEPIC topologies. Its dual-channel, N-channel MOSFET gate drivers and current-sense architecture are compatible with SEPIC configurations, where each channel controls one switch in the coupled-inductor arrangement. The datasheet includes explicit SEPIC application circuits and design guidance, confirming functional equivalence between topologies when using appropriate magnetics and layout practices.
How does the PHASEMODE pin affect timing relationships in multi-phase systems using the LTC3862HUH-2#PBF?
The PHASEMODE pin on the LTC3862HUH-2#PBF directly configures the phase offset between Channel 1 and Channel 2 (180°/180°/120°) and between Channel 1 and CLKOUT (90°/60°/240°), depending on whether it is pulled to SGND, left floating, or tied to 3.8V. This enables deterministic interleaving for 2-, 3-, 4-, 6-, or 12-phase systems when multiple LTC3862HUH-2#PBF controllers are synchronized via SYNC/CLKOUT, minimizing input current ripple and thermal stress.
What is the purpose of the 3V8 pin on the LTC3862HUH-2#PBF, and can it power external circuitry?
The 3V8 pin on the LTC3862HUH-2#PBF is the output of an internal 3.8V LDO powered from INTVCC, intended solely to supply the IC's internal analog and digital circuitry (e.g., comparators, reference, logic). It is rated for minimal current and is not designed to drive external loads. The datasheet explicitly states "This LDO is not intended to be used as a supply for external circuitry," and bypassing it with only a 1nF capacitor confirms its low-current, noise-sensitive role.
Can the LTC3862HUH-2#PBF operate without an external current sense resistor?
No, the LTC3862HUH-2#PBF requires external current sense resistors on both SENSE1+/– and SENSE2+/– pins for peak current mode control. It does not support No-RSENSE™ operation (a feature found in other Linear/Analog controllers like the LTC3862-1). The controller relies on the voltage drop across these resistors to determine real-time inductor current and enforce cycle-by-cycle current limiting-omitting them would disable core protection and regulation functions.
LTC3862HUH-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WQFN 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-QFN (5x5)
LTC3862HUH-2#PBF FAQ
1.How can I place an order for LTC3862HUH-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862HUH-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 LTC3862HUH-2#PBF reliable?
The price and inventory of LTC3862HUH-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 LTC3862HUH-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862HUH-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862HUH-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862HUH-2#PBF?
LTC3862HUH-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862HUH-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 LTC3862HUH-2#PBF?
For technical support, including LTC3862HUH-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862HUH-2#PBF requirements.
6.How does Aetrix verify that LTC3862HUH-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862HUH-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 LTC3862HUH-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862HUH-2#PBF?
All LTC3862HUH-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862HUH-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 LTC3862HUH-2#PBF part is unused and in its original packaging.
Return procedure for LTC3862HUH-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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