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Analog Devices Inc. LTC3862IUH#PBF
- Part No.:
- LTC3862IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WQFN Exposed Pad
- Datasheet:
-
LTC3862IUH#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:101
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Product details
Overview
LTC3862IUH#PBF from Analog Devices is a two-phase, constant-frequency, peak current mode step-up DC/DC controller driving N-channel MOSFETs for boost and SEPIC topologies. It operates from 4V to 36V input, delivers up to 96% max duty cycle, supports 75kHz–500kHz programmable switching frequency, and integrates dual 5V gate drivers with internal 5V/3.8V LDOs. It is used in automotive-grade 48V intermediate bus converters requiring high efficiency and multi-phase scalability.
For engineers reviewing the LTC3862IUH#PBF datasheet, LTC3862IUH#PBF pinout, LTC3862IUH#PBF application, or LTC3862IUH#PBF equivalent, key selection criteria include phase synchronization capability (SYNC/CLKOUT/PHASEMODE), adjustable leading edge blanking, ±1% reference accuracy, thermal performance in QFN-24 package, and AEC-Q100 qualification for automotive power supplies.
Technical Context
The LTC3862IUH#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 1.223V internal reference, generating ITH voltage to set peak inductor current. Slope compensation gain is programmable via SLOPE pin, and minimum on-time (180–340ns) is configurable via BLANK pin.
Phase coordination uses an internal PLL synchronized to external clocks (50kHz–650kHz) via SYNC, with CLKOUT enabling daisy-chained multi-phase operation (2-, 3-, 4-, 6-, or 12-phase). DMAX pin sets precise maximum duty cycle (75%, 84%, or 96%) derived from a 12× internal clock, ensuring tight timing control across temperature and supply variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide automotive battery range including cold-crank and load-dump conditions. |
| 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% - configured via DMAX pin; allows high step-up ratios (e.g., 12V→48V) without pulse-skipping instability. |
| Reference Accuracy | ±1% over temperature - ensures stable output regulation in industrial and automotive environments. |
| Gate Drive Voltage | 5V (INTVCC) - optimized for logic-level N-MOSFETs; reduces conduction losses and simplifies driver design. |
| Thermal Rating | –40°C to +125°C junction - qualified per AEC-Q100 Grade I; suitable for under-hood automotive applications. |
| Package | 24-pin 5mm × 5mm QFN (UH) - exposed pad tied to PGND; θJA = 44°C/W for reliable high-power density layout. |
Pinout & Package
Package: 24-lead (5mm × 5mm) plastic QFN with 0.65mm lead pitch and thermally enhanced exposed pad (Pin 25 = PGND). Requires soldering of exposed pad to PCB ground plane for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Duty cycle limit control | Configures max duty cycle: SGND = 96%, float = 84%, 3V8 = 75%; critical for stability in high-ratio boost designs. |
| GATE1 / GATE2 (Pins 16, 18) | N-MOSFET gate drive outputs | 5V logic-level drives referenced to PGND; each capable of driving >50nC QG MOSFETs with fast rise/fall times. |
| SENSE1+/SENSE2+ (Pins 23, 13) | Current sense positive inputs | Accept differential voltage across low-side sense resistors; trip threshold matches within ±10mV between channels. |
| FB (Pin 8) | Error amplifier inverting input | Connects to resistive divider from VOUT; sets regulated output voltage with 1.223V reference. |
| SYNC (Pin 11) | External clock input | Accepts 50kHz–650kHz TTL/CMOS clock; aligns GATE1 rising edge to SYNC rising edge for deterministic phase locking. |
| CLKOUT (Pin 10) | Multi-phase synchronization output | Provides phase-aligned clock signal to cascade additional LTC3862 controllers in 2–12-phase systems. |
| PHASEMODE (Pin 4) | Inter-channel phase configuration | Selects CH1–CH2 phase offset: 0° (SGND), 180° (float), or 120° (3V8); enables flexible interleaving for ripple cancellation. |
| INTVCC (Pin 19) | 5V gate driver LDO output | Supplies gate drivers and internal circuitry; requires ≥4.7µF X5R ceramic bypass to PGND near pin. |
| 3V8 (Pin 24) | 3.8V analog/digital LDO output | Powers internal comparators, amplifiers, and logic; bypassed with 1nF ceramic to SGND for noise immunity. |
| PGND (Pin 17 + Exposed Pad) | Power ground return | Must be kelvin-connected to MOSFET sources and VIN/INTVCC capacitors; exposed pad is electrically PGND. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output ripple current by up to 50% versus single-phase, cutting required capacitance and inductance size. |
| Programmable slope compensation | SLOPE pin adjusts gain (0.625× to 1.66× nominal) to stabilize current mode control across varying duty cycles and inductor values. |
| Adjustable leading edge blanking | BLANK pin selects 180ns (SGND), 260ns (float), or 340ns (3V8) blanking window to reject gate-drive-induced sensing noise. |
| Internal 5V/3.8V dual-LDO architecture | Eliminates need for external bias rails; INTVCC powers gate drivers, 3V8 powers precision analog blocks-improving PSRR and noise immunity. |
| AEC-Q100 Grade I qualification | Validated for automotive use from –40°C to +125°C; includes HTOL, TC, ESD, and AC/DC stress testing per automotive reliability standards. |
Applications
| Automotive 48V Mild Hybrid Systems | Industrial Telecom Intermediate Bus |
|---|---|
Use Scenario: Step-up conversion from 12V battery to 48V rail powering e-turbo, active suspension, and ADAS ECUs. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel power stages with synchronized switching to minimize EMI and input capacitor stress. Use Value: Achieves >94% efficiency at 5A output while meeting CISPR-25 Class 5 conducted emissions limits due to interleaved ripple cancellation. | Use Scenario: High-reliability 24V-to-48V intermediate bus converter in telecom base station power shelves. IC Role / Device Role / Timing Role: Primary controller for redundant boost stages; uses SYNC/CLKOUT to lock multiple LTC3862IUH#PBF units to common clock for deterministic load sharing. Use Value: Enables hot-swap-capable modular design with <100µs fault response and seamless phase shedding during partial-load operation. |
| Medical Imaging Power Supply | Test Equipment High-Voltage Bias |
Use Scenario: Compact, low-noise 5V-to-36V boost converter powering CCD/CMOS sensor bias rails in portable ultrasound devices. IC Role / Device Role / Timing Role: Precision current-mode controller with soft-start and programmable DMAX to prevent inrush into high-capacitance imaging loads. Use Value: Delivers <10mVpp output ripple and ±0.5% line/load regulation-critical for analog signal chain integrity in low-light imaging. | Use Scenario: Programmable 12V-to-100V boost supply in automated test equipment requiring fast transient response and remote voltage programming. IC Role / Device Role / Timing Role: Controller with FB loop compensated via ITH pin; supports external DAC feedback for digitally adjustable output voltage. Use Value: Supports 10ms step-response settling time and <1% output drift over 8-hour thermal soak-enabling high-precision parametric testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862EUH#PBF | Same silicon, rated for –40°C to +85°C ambient (E-grade) vs. –40°C to +125°C (I-grade). | Not qualified for under-hood automotive use; limited to commercial/industrial enclosures with active cooling. | Select when full AEC-Q100 qualification and extended temperature operation are not required. |
| LTC3862-1IUH#PBF | Higher INTVCC UVLO (7.0V/7.5V) and RUN threshold (1.22V → 2.2V); optimized for standard-threshold MOSFETs. | Supports higher-output-voltage (>60V) boost designs using 10V-gate MOSFETs; incompatible with logic-level FETs without level-shifting. | Choose only when driving standard-threshold N-MOSFETs in >50V output applications. |
Compared with LTC3862EUH#PBF, the LTC3862IUH#PBF provides guaranteed operation up to +125°C junction and AEC-Q100 compliance-essential for automotive integration-while LTC3862-1IUH#PBF trades logic-level compatibility for higher gate drive headroom, making it unsuitable as a drop-in replacement without circuit redesign.
Availability
LTC3862IUH#PBF is available at Aetrix Electronics and suitable for automotive power modules, telecom intermediate bus converters, and industrial medical imaging systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3862IUH#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3862 product line delivers high-efficiency, multi-phase boost and SEPIC controllers targeting automotive 48V systems, telecom infrastructure, and high-reliability industrial power conversion where precision, thermal robustness, and synchronization are critical.
FAQ
What is the maximum achievable output voltage using LTC3862IUH#PBF in a boost configuration?
The LTC3862IUH#PBF itself does not impose a hard upper limit on output voltage; it is constrained by external component ratings and layout. In practice, designs achieving 60V output have been validated using appropriate MOSFETs, diodes, and capacitors. The controller's 96% max duty cycle and 36V VIN rating enable high step-up ratios (e.g., 12V→48V), but system-level voltage stress, thermal management, and safety margins must be verified per application. LTC3862IUH#PBF supports this through precise current sensing and robust gate drive.
Does LTC3862IUH#PBF support synchronization to an external clock source?
Yes, LTC3862IUH#PBF supports full PLL-based synchronization via its SYNC pin, accepting external clock signals from 50kHz to 650kHz. The internal PLL locks GATE1's rising edge to the SYNC rising edge, enabling deterministic phase alignment across multiple controllers. This capability is essential for EMI reduction and coherent multi-phase operation in systems like telecom power shelves. LTC3862IUH#PBF also provides CLKOUT for daisy-chaining additional units.
How is thermal performance affected by the QFN package of LTC3862IUH#PBF?
The LTC3862IUH#PBF uses a 5mm × 5mm QFN package with exposed PGND pad, delivering θJA = 44°C/W-significantly better than SSOP (85°C/W) and comparable to TSSOP (38°C/W). Effective thermal design requires soldering the exposed pad to a large PCB copper area connected to PGND. This enables reliable operation at full load up to +125°C ambient when combined with proper layout, airflow, and MOSFET selection. LTC3862IUH#PBF's internal thermal shutdown further protects against sustained overload.
Can LTC3862IUH#PBF drive standard-threshold MOSFETs?
No, LTC3862IUH#PBF is optimized for logic-level N-channel MOSFETs with 5V gate drive (INTVCC = 5V). Its gate drivers are not rated for the 10V gate thresholds typical of standard-threshold devices. For such applications, Analog Devices specifies the LTC3862-1IUH#PBF variant, which features higher INTVCC UVLO (7.0V) and RUN thresholds, enabling safe operation with 10V-gate FETs. Using standard-threshold MOSFETs with LTC3862IUH#PBF risks insufficient RDS(on) and thermal runaway.
What is the purpose of the 3V8 pin on LTC3862IUH#PBF, and how should it be decoupled?
The 3V8 pin on LTC3862IUH#PBF is the output of an internal 3.8V LDO powered from INTVCC, supplying low-noise bias to analog comparators, error amplifiers, and digital logic. It must be decoupled with a 1nF X5R ceramic capacitor placed directly between 3V8 and SGND, as close as possible to the IC. This capacitor suppresses high-frequency noise coupling into sensitive analog nodes. LTC3862IUH#PBF's 3V8 rail is not intended to power external circuitry-doing so degrades regulation accuracy and noise performance.
LTC3862IUH#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):
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (5x5)
LTC3862IUH#PBF FAQ
1.How can I place an order for LTC3862IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862IUH#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 LTC3862IUH#PBF reliable?
The price and inventory of LTC3862IUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862IUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862IUH#PBF?
LTC3862IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862IUH#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 LTC3862IUH#PBF?
For technical support, including LTC3862IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862IUH#PBF requirements.
6.How does Aetrix verify that LTC3862IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862IUH#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 LTC3862IUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862IUH#PBF?
All LTC3862IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862IUH#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 LTC3862IUH#PBF part is unused and in its original packaging.
Return procedure for LTC3862IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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