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Analog Devices Inc. LTC3862IUH-1#PBF
- Part No.:
- LTC3862IUH-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WQFN Exposed Pad
- Datasheet:
-
LTC3862IUH-1#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,628
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Product details
Overview
LTC3862IUH-1#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 8.5V to 36V input, delivers up to 96% duty cycle, supports 75kHz–500kHz adjustable switching frequency, and integrates dual 10V gate drivers - enabling high-voltage boost conversion in telecom power supplies and industrial battery-backed systems.
For engineers reviewing the LTC3862IUH-1#PBF datasheet, LTC3862IUH-1#PBF pinout, LTC3862IUH-1#PBF application, or LTC3862IUH-1#PBF equivalent, key selection considerations include phase synchronization capability (SYNC/CLKOUT), programmable maximum duty cycle (DMAX), leading-edge blanking control (BLANK), slope compensation tuning (SLOPE), and thermal performance in the –40°C to 125°C industrial temperature grade.
Technical Context
The LTC3862IUH-1#PBF implements fixed-frequency, peak current mode control with two interleaved channels operating 180° out of phase, reducing input/output ripple and filter component stress. Its internal 10V LDO (INTVCC) powers gate drivers, while a cascaded 3.8V LDO (3V8) supplies analog/digital circuitry - both thermally isolated and independently bypassed.
Phase relationship is programmable via PHASEMODE (0°/120°/180°), and multi-phase expansion (up to 12-phase) is enabled through SYNC input, CLKOUT output, and PLL-based clock alignment. The controller features ±1% reference accuracy (1.223V FB), adjustable slope compensation, and precision RUN pin threshold (1.22V) with 80mV hysteresis for reliable start-up sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.5V to 36V - supports wide-range industrial and telecom inputs including 12V, 24V, and 32V bus systems. |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable) - enables optimization of efficiency vs. size for magnetics and capacitors. |
| Max Duty Cycle | Up to 96% (via DMAX pin) - allows high step-up ratios (e.g., 12V→72V) without requiring excessive turns ratio or low-VF diodes. |
| Gate Drive Voltage | 10V (INTVCC) - sufficient to fully enhance high-voltage N-channel MOSFETs (e.g., 60V–100V Rds(on)-optimized devices). |
| Reference Voltage | 1.223V ±1% - ensures precise output voltage regulation across temperature and line variations in feedback divider networks. |
| Operating Temp Range | –40°C to +125°C (I-grade) - qualified for under-hood automotive auxiliary supplies and industrial control cabinets. |
| Min On-Time | 210ns to 375ns (BLANK pin selectable) - supports high-frequency operation with small inductors while maintaining stability at light loads. |
Pinout & Package
Package: 24-lead (5mm × 5mm) plastic QFN (UH24) with exposed PGND pad - provides low thermal resistance (θJA = 44°C/W) and robust PCB thermal dissipation when soldered per datasheet guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE1 / GATE2 | High-side N-MOS gate driver outputs | 10V CMOS-compatible outputs referenced to PGND; drive external high-voltage MOSFETs directly without level shifters. |
| SENSE1+/SENSE2+ & SENSE1–/SENSE2– | Differential current sense inputs | Measure MOSFET source current via external sense resistors; support channel matching within ±10mV for balanced interleaving. |
| FB | Error amplifier inverting input | Connects to resistor divider from VOUT; sets regulated output voltage as VOUT = 1.223V × (1 + R1/R2). |
| ITH | Error amplifier output / current limit programming | Controls peak current trip threshold; also used for loop compensation via Type II/III network on ITH-to-FB path. |
| DMAX | Maximum duty cycle control | SGND = 96%, float = 84%, 3V8 = 75% - enables safe operation near VIN/VOUT limits and prevents shoot-through in SEPIC. |
| PHASEMODE | Interleaving phase configuration | SGND/float/3V8 selects 180°/180°/120° CH1–CH2 phase offset - critical for optimizing ripple cancellation in multi-phase layouts. |
| SYNC / CLKOUT | PLL synchronization interface | Accepts 50–650kHz external clock (SYNC); outputs aligned clock (CLKOUT) for daisy-chaining up to 12-phase systems. |
| INTVCC / 3V8 | Cascaded LDO outputs | INTVCC = 10V @ 50mA (gate drive); 3V8 = 3.8V @ ~10mA (analog/digital core) - require separate ceramic bypassing (4.7µF + 1nF). |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved architecture | Reduces input/output RMS current by ~30%, allowing smaller input capacitors and lower ESR output caps in 72V telecom supplies. |
| Programmable slope compensation (SLOPE pin) | Adjusts compensation gain (0.625×/1×/1.66× nominal) to stabilize current mode control across varying duty cycles and inductor values. |
| Internal 10V LDO with UVLO (7.5V rising) | Ensures gate drivers only activate when INTVCC is stable - prevents partial turn-on and MOSFET failure during brown-out conditions. |
| Precision RUN pin (1.22V threshold, 80mV hysteresis) | Enables clean, noise-immune power sequencing in multi-rail systems; internal 4.5µA pull-up enables user-defined hysteresis via external resistor. |
| Leading-edge blanking (BLANK pin) | Selects min on-time (210/290/375ns) to suppress gate-drive-induced current-sense spikes - essential for accurate peak current sensing with fast-switching MOSFETs. |
Applications
| Telecom Intermediate Bus Converter | Industrial Battery Backup Supply |
|---|---|
Use Scenario: Step-up from 24V battery bank to 48V/72V intermediate bus in cellular base station power shelves. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel MOSFETs per phase; synchronizes to system clock via SYNC to minimize EMI. Use Value: Achieves >94% efficiency at 2A load with reduced input capacitance versus single-phase designs, extending runtime and lowering thermal stress. |
Use Scenario: Maintaining 72V output during AC mains failure in factory automation PLC power modules. IC Role / Device Role / Timing Role: SEPIC topology controller providing non-inverting step-up/step-down capability; uses DMAX pin to clamp duty cycle during low-battery brown-out. Use Value: Enables seamless transition between line-powered and battery-powered modes without output dropout or reconfiguration. |
| Automotive ADAS Camera Power | Test Equipment High-Voltage Bias Supply |
Use Scenario: Generating stable 60V rail from 12V vehicle battery for radar/LiDAR sensor arrays in harsh under-hood environments. IC Role / Device Role / Timing Role: Boost controller operating at 300kHz with PHASEMODE set to 180°; leverages QFN thermal pad for conduction cooling on metal-core PCB. Use Value: Meets AEC-Q100 stress requirements (–40°C to +125°C) while delivering <10mVpp output ripple for low-noise image sensor biasing. |
Use Scenario: Programmable 30–100V output supply in automated test equipment requiring precise voltage setting and fast transient response. IC Role / Device Role / Timing Role: Controller in digitally adjusted boost converter; FB pin fed from DAC-controlled divider; soft-start (SS pin) enables controlled ramp-up. Use Value: Supports remote voltage programming via ITH/FB interface and maintains ±0.5% regulation over line/load/temperature per IEEE 1149.4 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862EUH-1#PBF | Same silicon, rated for –40°C to +85°C (E-grade) instead of –40°C to +125°C (I-grade); identical pinout and electrical specs. | Suitable for commercial/indoor applications where ambient temperature remains below 85°C; not qualified for extended industrial or automotive under-hood use. | Select when full I-grade thermal margin is unnecessary and cost sensitivity favors E-grade pricing. |
| LTC3862HUH-1#PBF | Same silicon, rated for –40°C to +150°C (H-grade); higher thermal specification but identical functional behavior and package. | Required for extreme-environment applications such as downhole oil/gas tools or military avionics where junction temperatures exceed 125°C. | Choose only if design requires guaranteed operation beyond 125°C ambient; adds cost and may be over-specified for most industrial cases. |
Compared with LTC3862EUH-1#PBF and LTC3862HUH-1#PBF, the LTC3862IUH-1#PBF offers the optimal balance of extended temperature capability (–40°C to +125°C), production availability, and cost - making it the default choice for industrial power supplies, telecom infrastructure, and automotive ADAS subsystems.
Availability
LTC3862IUH-1#PBF is available at Aetrix Electronics and suitable for telecom intermediate bus converters, industrial battery backup systems, and automotive ADAS camera power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3862IUH-1#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 the LTC portfolio - recognized globally for high-performance power management ICs.
The LTC3862 series is part of Linear's high-voltage DC/DC controller family, designed specifically for demanding boost, SEPIC, and multiphase applications in telecom, industrial, and automotive systems where efficiency, thermal robustness, and precise control are critical.
FAQ
What is the maximum supported switching frequency for LTC3862IUH-1#PBF?
The LTC3862IUH-1#PBF supports an adjustable switching frequency range of 75kHz to 500kHz using an external resistor on the FREQ pin. When synchronized to an external clock via the SYNC pin, it accepts input frequencies from 50kHz to 650kHz - enabling precise EMI management and multi-phase alignment in complex power systems.
Does LTC3862IUH-1#PBF support SEPIC topology?
Yes, the LTC3862IUH-1#PBF explicitly supports SEPIC topology in addition to boost, as confirmed in its datasheet description and typical application circuits. Its dual N-channel gate drivers, programmable DMAX, and current-mode control architecture allow stable operation in non-inverting buck-boost configurations with proper transformer or coupled-inductor implementation.
How does the PHASEMODE pin affect channel timing in LTC3862IUH-1#PBF?
The PHASEMODE pin on the LTC3862IUH-1#PBF sets the phase relationship between CH1 and CH2 gate signals: grounded → 180°, floating → 180°, tied to 3V8 → 120°. This directly determines interleaving behavior - critical for ripple cancellation and thermal distribution. The same pin also defines CH1-to-CLKOUT phase (90°/60°/240°), enabling deterministic multi-IC synchronization.
What is the purpose of the BLANK pin on LTC3862IUH-1#PBF?
The BLANK pin on LTC3862IUH-1#PBF controls minimum on-time and leading-edge blanking duration: tied to SGND → 210ns, floating → 290ns, tied to 3V8 → 375ns. This feature suppresses false current-sense triggering caused by gate-drive-induced voltage spikes across the sense resistor, ensuring accurate peak current detection especially with fast-switching MOSFETs.
Can LTC3862IUH-1#PBF drive logic-level MOSFETs?
The LTC3862IUH-1#PBF is optimized for high-voltage N-channel MOSFETs using its 10V INTVCC gate drive. While it can technically drive logic-level devices, its internal LDO UVLO (7.5V rising) and lack of 5V gate drive option make it less ideal than alternatives like the LTC3862 (non-"-1") variant, which supports lower gate voltages - consult the full LTC3862 datasheet for logic-level compatible versions.
LTC3862IUH-1#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):
- 8.5V ~ 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (5x5)
LTC3862IUH-1#PBF FAQ
1.How can I place an order for LTC3862IUH-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862IUH-1#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-1#PBF reliable?
The price and inventory of LTC3862IUH-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862IUH-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862IUH-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862IUH-1#PBF?
LTC3862IUH-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862IUH-1#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-1#PBF?
For technical support, including LTC3862IUH-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862IUH-1#PBF requirements.
6.How does Aetrix verify that LTC3862IUH-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862IUH-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862IUH-1#PBF?
All LTC3862IUH-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862IUH-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LTC3862IUH-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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