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Analog Devices Inc. LTC3862IUH-1#TRPBF
- Part No.:
- LTC3862IUH-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WQFN Exposed Pad
- Datasheet:
-
LTC3862IUH-1#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,098
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Product details
Overview
LTC3862IUH-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, constant-frequency, peak current-mode boost and SEPIC DC/DC controller driving external N-channel MOSFETs. It operates from 8.5V to 36V input, delivers up to 96% max duty cycle, supports 75kHz–500kHz adjustable switching frequency, and integrates dual 10V gate drivers for high-voltage MOSFETs - used in telecom power supplies requiring high-efficiency, low-noise, multi-phase step-up conversion.
For engineers reviewing the LTC3862IUH-1#TRPBF datasheet, LTC3862IUH-1#TRPBF pinout, LTC3862IUH-1#TRPBF application, or LTC3862IUH-1#TRPBF equivalent, key selection criteria include its 2-phase interleaved operation reducing input/output ripple, programmable phase relationship via PHASEMODE, internal 10V/3.8V LDOs, and ±1% reference accuracy over –40°C to 125°C.
Technical Context
The LTC3862IUH-1#TRPBF implements fixed-frequency peak current mode control with two independent channels operating 180° out of phase by default, configurable to 120° or 90° via PHASEMODE. Its error amplifier compares FB voltage against a 1.223V internal reference and drives ITH to modulate peak inductor current.
It features a PLL-based synchronization architecture accepting 50kHz–650kHz external clocks on SYNC, generating CLKOUT for daisy-chained multi-phase systems (2-/3-/4-/6-/12-phase), and includes slope compensation (adjustable via SLOPE pin), leading-edge blanking (BLANK pin), and precise DMAX programming for duty-cycle limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 8.5V to 36V - enables direct integration into 12V/24V industrial and telecom battery or bus-fed systems without pre-regulation. |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable) - balances efficiency vs. size: lower frequencies reduce switching loss; higher frequencies shrink magnetics/capacitors. |
| Max Duty Cycle | Up to 96% (via DMAX pin grounded) - supports high step-up ratios (e.g., 12V→72V) while maintaining stable regulation under heavy load. |
| Reference Voltage | 1.223V ±1% - ensures accurate output voltage setting across temperature and line variations, critical for precision power rails. |
| Gate Drive | 10V output (INTVCC) with 3Ω pull-up / 0.9Ω pull-down - reliably drives high-Qg N-MOSFETs (e.g., >50nC) with fast turn-on/turn-off and low conduction loss. |
| Operating Temp | –40°C to +125°C (I-grade) - qualified for extended-temperature industrial and automotive under-hood applications. |
| Package | 24-pin 5mm × 5mm QFN (UH), exposed PGND pad - provides low thermal resistance (θJA = 44°C/W) and robust PCB heat dissipation. |
Pinout & Package
Package: 24-lead (5mm × 5mm) plastic QFN (UH package), thermally enhanced with exposed PGND pad soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Duty cycle limit control | Ground → 96%; float → 84%; 3V8 → 75% - enables precise overvoltage protection and loop stability tuning. |
| GATE1/GATE2 (Pins 18/16) | N-MOSFET gate drivers | 10V push-pull outputs referenced to PGND - drive high-side boost switches directly without level shifters. |
| SENSE1+/SENSE2+ (Pins 23/13) | Current sense inputs | Differential inputs for low-side current-sense resistors - enable per-phase current limiting and cycle-by-cycle protection. |
| PHASEMODE (Pin 4) | Phase relationship selector | SGND → 180° CH1–CH2; float → 180° CH1–CLKOUT; 3V8 → 120° - configures interleaving for optimal ripple cancellation. |
| SYNC (Pin 11) | PLL synchronization input | Accepts 50–650kHz external clock - enables system-wide frequency alignment and EMI reduction in multi-converter designs. |
| INTVCC (Pin 19) | 10V gate driver LDO output | Supplies gate drivers; UVLO at 7.0V/7.5V - prevents weak turn-on during brownout and ensures MOSFET reliability. |
| 3V8 (Pin 24) | 3.8V analog/digital LDO output | Powers internal comparators, amplifiers, logic - bypassed with 1nF ceramic for noise immunity and stable reference operation. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output capacitor RMS current by ~70%, enabling smaller, lower-cost bulk capacitance and lower EMI. |
| Programmable slope compensation | SLOPE pin adjusts gain (0.625×/1×/1.66×) to stabilize current mode control across wide duty cycles and inductor values. |
| Adjustable leading-edge blanking | BLANK pin sets minimum on-time (210ns–375ns) to suppress gate-drive-induced current-sense noise during switch turn-on. |
| Internal 10V/3.8V dual-LDO architecture | Eliminates need for external bias supplies; INTVCC powers gate drivers, 3V8 powers precision analog circuitry - improves layout simplicity and noise isolation. |
| Multi-phase scalability (2/3/4/6/12-phase) | CLKOUT and SYNC pins support daisy-chained synchronization without external timing ICs - simplifies high-current (>10A) boost supply design. |
Applications
| Telecom Line Card Power | Industrial Motor Drive Bias Supply |
|---|---|
Use Scenario: Generating isolated 72V bias rail from 24V backplane in LTE base station line cards. IC Role / Device Role / Timing Role: Dual-phase boost controller managing interleaved switching, current sharing, and precise output regulation. Use Value: Achieves >94% efficiency at 2A load while meeting EN55022 Class B conducted EMI limits due to phase cancellation. | Use Scenario: Providing regulated 48V gate drive supply for IGBT modules in servo motor inverters. IC Role / Device Role / Timing Role: High-reliability step-up controller with 125°C operation and robust UVLO protection for harsh factory environments. Use Value: Maintains stable gate voltage during 8.5–36V input transients, preventing IGBT shoot-through and ensuring safe startup/shutdown. |
| Automotive ADAS Camera Power | Test Equipment High-Voltage Source |
Use Scenario: Converting 12V vehicle battery to 36V for image sensor bias in surround-view camera modules. IC Role / Device Role / Timing Role: Compact, thermally efficient boost controller with soft-start and precise VOUT regulation. Use Value: Enables cold-crank operation down to 8.5V input and meets AEC-Q100 stress test requirements via I-grade qualification. | Use Scenario: Programmable 20–80V output supply in automated test equipment requiring fast transient response. IC Role / Device Role / Timing Role: Precision-controlled current-mode controller with adjustable frequency and duty cycle for flexible output configuration. Use Value: Delivers <1% output voltage drift over temperature and load, supporting calibration-grade measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862EUH-1#TRPBF | Same silicon, rated for –40°C to +85°C (E-grade) instead of –40°C to +125°C (I-grade). | Not suitable for high-ambient-temperature industrial enclosures or under-hood automotive use. | Select when ambient temperature stays below 85°C and cost sensitivity outweighs extended temp margin. |
| LTC3862HUH-1#TRPBF | Same silicon, rated for –40°C to +150°C (H-grade) with tighter thermal derating and higher reliability screening. | Required for mission-critical aerospace or high-power density applications where junction temperature exceeds 125°C. | Select only if sustained operation above 125°C junction is verified and H-grade qualification is mandated. |
Compared with LTC3862EUH-1#TRPBF and LTC3862HUH-1#TRPBF, the LTC3862IUH-1#TRPBF offers the optimal balance of extended temperature capability, production volume availability, and cost - making it the standard choice for industrial and telecom designs requiring guaranteed performance up to 125°C.
Availability
LTC3862IUH-1#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial motor drive bias rails, and automotive ADAS camera modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3862IUH-1#TRPBF 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 continuity, technical support, and manufacturing for all Linear power management ICs.
The LTC3862 family is designed specifically for high-efficiency, multi-phase, high-voltage boost and SEPIC DC/DC conversion in space-constrained, thermally demanding applications such as telecom infrastructure and industrial automation.
FAQ
What is the maximum supported switching frequency for LTC3862IUH-1#TRPBF?
The LTC3862IUH-1#TRPBF 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 SYNC, it accepts input frequencies from 50kHz to 650kHz - enabling system-level EMI management and multi-converter coordination beyond its native range.
Does LTC3862IUH-1#TRPBF support SEPIC topology in addition to boost?
Yes, the LTC3862IUH-1#TRPBF is explicitly specified for both boost and SEPIC topologies. Its dual-channel current-mode architecture, independent SENSE+/- inputs per channel, and programmable slope compensation allow stable operation in SEPIC configurations with coupled or uncoupled inductors and proper transformerless AC coupling.
How does the PHASEMODE pin affect channel timing in LTC3862IUH-1#TRPBF?
The PHASEMODE pin on LTC3862IUH-1#TRPBF selects the phase offset between Channel 1 and Channel 2: grounded → 180°, floating → 180°, or tied to 3V8 → 120°. It also determines CH1-to-CLKOUT phase: 90°, 60°, or 240° respectively - enabling optimized ripple cancellation and scalable multi-phase expansion.
What is the purpose of the BLANK pin on LTC3862IUH-1#TRPBF?
The BLANK pin on LTC3862IUH-1#TRPBF controls leading-edge blanking duration to suppress false current-sense triggering during MOSFET turn-on. Grounding BLANK sets 210ns minimum on-time, floating yields 290ns, and tying to 3V8 extends it to 375ns - improving noise immunity in high-dV/dt boost applications.
Can LTC3862IUH-1#TRPBF drive logic-level MOSFETs?
No - the LTC3862IUH-1#TRPBF's 10V INTVCC gate drive is optimized for high-voltage N-channel MOSFETs (e.g., 30V–100V Rds(on) devices). For logic-level MOSFETs requiring 4.5V–5V gate drive, Analog Devices recommends the LTC3862 (non-"-1") variant, which features a 5V gate driver and different UVLO thresholds.
LTC3862IUH-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3862IUH-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862IUH-1#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3862IUH-1#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862IUH-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862IUH-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862IUH-1#TRPBF?
LTC3862IUH-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862IUH-1#TRPBF 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#TRPBF?
For technical support, including LTC3862IUH-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862IUH-1#TRPBF requirements.
6.How does Aetrix verify that LTC3862IUH-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862IUH-1#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862IUH-1#TRPBF?
All LTC3862IUH-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862IUH-1#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862IUH-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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