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Analog Devices Inc. LTC3862IUH-2#TRPBF
- Part No.:
- LTC3862IUH-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WQFN Exposed Pad
- Datasheet:
-
LTC3862IUH-2#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,974
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Product details
Overview
LTC3862IUH-2#TRPBF 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 96% max duty cycle, supports 75kHz–500kHz programmable switching frequency, and features internal 10V/3.8V LDOs for gate drive and analog circuitry - used in high-voltage telecom power supplies requiring tight regulation and phase interleaving.
For engineers reviewing the LTC3862IUH-2#TRPBF datasheet, LTC3862IUH-2#TRPBF pinout, LTC3862IUH-2#TRPBF application, or LTC3862IUH-2#TRPBF equivalent, key selection criteria include its dual-phase interleaved architecture, INTVCC UVLO threshold (4.4V rising), ±1% reference accuracy, 180° channel phase shift, and QFN-24 (5mm × 5mm) thermal performance at –40°C to +125°C junction temperature.
Technical Context
The LTC3862IUH-2#TRPBF implements fixed-frequency peak current mode control with two independent channels operating 180° out-of-phase, reducing input/output ripple and filter component stress. Its internal 10V LDO powers gate drivers while a cascaded 3.8V LDO supplies analog/digital circuitry, enabling robust operation with high-side N-MOSFETs rated for 6V VGS.
Phase synchronization is achieved via PLL-based SYNC input (50kHz–650kHz), CLKOUT daisy-chaining, and PHASEMODE pin programming for 2-/3-/4-/6-/12-phase expansion. Slope compensation gain (adjustable via SLOPE pin), leading edge blanking (BLANK pin), and programmable DMAX provide stability across wide duty-cycle and load ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Two-phase boost/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 28V nominal rails. |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable); 50kHz–650kHz (SYNC-locked) - allows optimization of efficiency vs. size trade-offs in high-voltage boost designs. |
| Max Duty Cycle | 96% (DMAX = SGND), 84% (DMAX = float), 75% (DMAX = 3V8) - supports high step-up ratios (e.g., 12V→80V) without violating minimum off-time constraints. |
| Reference Voltage | 1.223V ±1% - ensures precise output voltage regulation under line/load/temperature variation in feedback loop design. |
| INTVCC UVLO Threshold | 4.4V (rising), 3.9V (falling) - protects gate drivers from insufficient bias during brown-in/brown-out, compatible with 6V-rated MOSFETs. |
| Operating Temp Range | –40°C to +125°C (I-grade) - qualified for automotive under-hood and industrial ambient environments with derated lifetime above 125°C. |
Pinout & Package
Package: 24-lead (5mm × 5mm) plastic QFN (UH package), exposed PGND pad soldered to PCB for thermal and electrical integrity (θJA = 44°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE1 / GATE2 | High-side N-MOSFET gate drivers | 10V rail-referenced outputs capable of driving >50nC QG MOSFETs; absolute max rating –0.3V to 11V. |
| SENSE1+/SENSE2+, SENSE1–/SENSE2– | Dual current-sense comparator inputs | Measure source-side sense resistor voltage; threshold matched within ±7mV; supports adjustable blanking and slope compensation. |
| INTVCC | 10V LDO output for gate drivers | Bypass with ≥4.7µF X5R ceramic to PGND; supplies up to 50mA; includes UVLO (4.4V/3.9V) for MOSFET protection. |
| 3V8 | 3.8V LDO output for analog/digital circuitry | Bypass with 1nF ceramic to SGND; powers internal error amp, PLL, logic - not intended for external loads. |
| FREQ | Oscillator frequency programming | Resistor-to-SGND sets fSW; nominal 1.223V at pin; supports 75kHz–500kHz range with <±1% temp drift. |
| PHASEMODE | Interleaved phase configuration | Selects CH1–CH2 phase offset (0°/120°/180°) and CH1–CLKOUT relationship (60°/90°/240°) for multi-phase scaling. |
| SYNC / CLKOUT | PLL synchronization interface | Accepts 50–650kHz external clock; CLKOUT provides phase-aligned digital output for daisy-chaining up to 12 phases. |
| RUN | Enable/disable control with hysteresis | 1.22V enable threshold with 80mV hysteresis; internal 0.5µA pull-up + 4.5µA active pull-up for clean startup/shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output capacitor RMS current by ~70%, enabling smaller, lower-cost bulk capacitance in high-power boost converters. |
| Programmable maximum duty cycle (75–96%) | Enables stable high step-up ratio designs (e.g., 12V→80V) while avoiding minimum off-time violation and subharmonic instability. |
| Adjustable slope compensation gain | SLOPE pin configures normalized gain (0.625×/1.0×/1.66×) to maintain loop stability across wide duty-cycle and inductor value variations. |
| Internal 10V/3.8V dual-LDO architecture | Eliminates need for external bias supplies; INTVCC powers gate drivers, 3V8 powers precision analog blocks - improves noise immunity and layout simplicity. |
| Leading edge blanking (210–375ns) | BLANK pin selects minimum on-time to suppress gate-drive-induced current-sense noise during MOSFET turn-on transients. |
Applications
| Telecom Power Supply | Industrial High-Voltage Bias Supply |
|---|---|
|
Use Scenario: Generating 48V or 80V from 12V/24V intermediate bus in LTE base station RF power amplifiers. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved gate timing, current sensing, and voltage regulation. Use Value: Reduces output capacitor count by 50% versus single-phase design while maintaining <1% output voltage ripple at 7A load. |
Use Scenario: Providing isolated high-voltage bias for photomultiplier tubes or avalanche photodiodes in industrial sensors. IC Role / Device Role / Timing Role: SEPIC-mode controller delivering regulated 80V output with input transient tolerance up to 36V. Use Value: Achieves 95% peak efficiency at 80V/1A using 16µH inductors and 0.0033Ω sense resistors - minimizing heat sink requirements. |
| Automotive ADAS Camera Power | Test Equipment DC Source |
|
Use Scenario: Powering 72V image sensor arrays in automotive surround-view camera modules with cold-crank (4.5V) support. IC Role / Device Role / Timing Role: Boost controller with programmable UVLO (4.4V) and soft-start, synchronized to system clock via SYNC pin. Use Value: Maintains regulation during engine start (VIN dip to 6V) with no output dropout due to 96% DMAX and fast transient response. |
Use Scenario: Programmable lab DC source module generating 30–100V outputs with remote sense and digital control interface. IC Role / Device Role / Timing Role: Core voltage regulation engine with ITH pin used for analog voltage programming and FB for precision feedback. Use Value: Enables <±0.1% output accuracy over temperature using 1.223V ±1% reference and Kelvin-connected SGND for load regulation. |
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-2#TRPBF | E-grade (–40°C to +85°C) QFN variant; identical electrical specs but lower thermal rating (θJA = 44°C/W same, but max TJ = 85°C). | Suitable for commercial indoor equipment; not qualified for under-hood or extended-temperature industrial use. | Select when ambient temperature stays below 70°C and cost sensitivity outweighs extended temp qualification. |
| LTC3862IUH-1#TRPBF | Same package/temp grade, but higher INTVCC UVLO (7.0V/7.5V) and different RUN thresholds - optimized for logic-level MOSFETs. | Requires 10V gate drive; incompatible with 6V-rated high-voltage MOSFETs used with LTC3862IUH-2#TRPBF. | Choose only if driving logic-level N-MOSFETs; not drop-in compatible due to UVLO and RUN threshold mismatch. |
Compared with LTC3862EUH-2#TRPBF and LTC3862IUH-1#TRPBF, the LTC3862IUH-2#TRPBF uniquely balances extended temperature operation (–40°C to +125°C), low INTVCC UVLO (4.4V), and compatibility with 6V-gate high-voltage MOSFETs - making it optimal for thermally demanding telecom and automotive boost applications.
Availability
LTC3862IUH-2#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial high-voltage bias generation, and automotive ADAS camera systems requiring stable component supply with full I-grade temperature qualification and lead-free RoHS compliance.
Supply support for LTC3862IUH-2#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 its high-performance analog IC portfolio, emphasizing precision power management, signal conditioning, and RF solutions for mission-critical applications.
The LTC3862 series was designed as a family of multi-phase current-mode controllers targeting high-efficiency, high-step-up DC/DC conversion in space-constrained telecom, industrial, and automotive systems - with LTC3862IUH-2#TRPBF specifically optimized for 6V-gate MOSFETs and extended temperature operation.
FAQ
What is the maximum achievable output voltage using LTC3862IUH-2#TRPBF in boost topology?
The LTC3862IUH-2#TRPBF itself does not limit output voltage; it controls external MOSFETs and diodes. With 96% max duty cycle and proper component selection (e.g., 100V-rated output capacitors, 150V MOSFETs), designs achieving 80V output from 12V input are documented. Output voltage is set by the FB resistive divider and constrained by external component voltage ratings and loop stability margins.
Does LTC3862IUH-2#TRPBF support SEPIC converter topology?
Yes, the LTC3862IUH-2#TRPBF explicitly supports SEPIC operation per its datasheet. Its dual-channel current-mode architecture, independent SENSE+/- inputs per phase, and flexible gate drive timing allow implementation of two-phase interleaved SEPIC converters - improving ripple cancellation and power density over single-phase SEPIC.
How is thermal performance affected by the exposed pad on the LTC3862IUH-2#TRPBF QFN package?
The exposed pad (Pin 25) of the LTC3862IUH-2#TRPBF is electrically and thermally connected to PGND. It must be soldered to a PCB copper pour tied to PGND to achieve the specified θJA = 44°C/W. Omitting this connection degrades thermal resistance by >20°C/W and risks exceeding 125°C junction temperature under full load.
Can LTC3862IUH-2#TRPBF synchronize to an external clock while operating in two-phase mode?
Yes. The LTC3862IUH-2#TRPBF uses its SYNC input and internal PLL to lock switching frequency to an external clock (50kHz–650kHz). In two-phase mode, PHASEMODE pin configures CH1–CH2 as 180° out-of-phase, and CLKOUT provides a phase-aligned output for system-level timing coordination - all while maintaining synchronization.
What is the purpose of the 3V8 pin on LTC3862IUH-2#TRPBF, 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 for internal analog/digital circuitry (error amp, PLL, logic). It must be bypassed with a 1nF ceramic capacitor to SGND. The datasheet explicitly states it is not intended for external loads - doing so risks reference inaccuracy and thermal overload.
LTC3862IUH-2#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):
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (5x5)
LTC3862IUH-2#TRPBF FAQ
1.How can I place an order for LTC3862IUH-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862IUH-2#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-2#TRPBF reliable?
The price and inventory of LTC3862IUH-2#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-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862IUH-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862IUH-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862IUH-2#TRPBF?
LTC3862IUH-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862IUH-2#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-2#TRPBF?
For technical support, including LTC3862IUH-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862IUH-2#TRPBF requirements.
6.How does Aetrix verify that LTC3862IUH-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862IUH-2#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-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862IUH-2#TRPBF?
All LTC3862IUH-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862IUH-2#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-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862IUH-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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