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Analog Devices Inc. LTC3862IFE-2#TRPBF
- Part No.:
- LTC3862IFE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3862IFE-2#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,273
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Product details
Overview
LTC3862IFE-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 for high-voltage step-up conversion. It operates from 5.5V to 36V input, delivers up to 80V output, supports 75kHz–500kHz programmable switching frequency, and features internal 10V/3.8V LDOs, 180° phase shift, and ±1% reference accuracy - used in telecom power supplies requiring stable high-voltage rail generation.
For engineers reviewing the LTC3862IFE-2#TRPBF datasheet, LTC3862IFE-2#TRPBF pinout, LTC3862IFE-2#TRPBF application, or LTC3862IFE-2#TRPBF equivalent, key selection criteria include its dual-phase current-mode control architecture, INTVCC UVLO thresholds (4.4V rising / 3.9V falling), 24-pin TSSOP package with exposed PGND pad, and support for multi-phase synchronization via SYNC/CLKOUT/PHASEMODE pins.
Technical Context
The LTC3862IFE-2#TRPBF 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 1.223V internal reference and drives ITH to modulate peak inductor current per cycle.
It integrates cascaded LDOs: a 10V INTVCC regulator (4.4V UVLO+, 3.9V UVLO−) powers gate drivers, while a 3.8V LDO (3V8 pin) supplies analog/digital circuitry. Phase relationships (CH1–CH2, CH1–CLKOUT) are programmable via PHASEMODE voltage (0V/float/3.8V), enabling 2-/3-/4-/6-/12-phase systems using SYNC and CLKOUT signals.
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) - allows optimization of efficiency vs. size; supports external sync from 50kHz to 650kHz. |
| Reference Voltage | 1.223V ±1% - provides precise output voltage regulation when setting VOUT via FB resistive divider. |
| INTVCC UVLO Threshold | 4.4V (rising), 3.9V (falling) - ensures reliable gate drive startup/shutdown for 6V-rated MOSFETs without overdriving logic-level devices. |
| Max Duty Cycle | Programmable: 75% (3V8), 84% (float), 96% (SGND) - enables flexible design trade-offs between voltage gain, efficiency, and MOSFET stress. |
| Operating Temp Range | –40°C to +125°C (I-grade) - qualified for industrial and extended-temperature embedded power applications. |
Pinout & Package
Package: 24-lead thermally enhanced TSSOP (FE24) with exposed PGND pad (Pin 25), 0.65mm lead pitch, θJA = 38°C/W. Exposed pad must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 17, Exposed Pad 25) | Power Ground Reference | Return path for high-current gate drive and MOSFET source currents; electrically isolated from SGND; exposed pad must be soldered to PCB ground plane. |
| GATE1 / GATE2 (Pins 18, 16) | N-Channel MOSFET Gate Drivers | 10V gate drive outputs referenced to PGND; capable of driving high-Qg MOSFETs; absolute max rating –0.3V to 11V. |
| SENSE1+/SENSE2+ (Pins 23, 13) | Current Sense Positive Inputs | Connect to top of sense resistors; trip threshold adjustable via ITH voltage; matched within ±7mV between channels. |
| FB (Pin 8) | Error Amplifier Inverting Input | Feedback node for output voltage regulation; referenced to 1.223V internal reference; requires Kelvin connection to output for best load regulation. |
| INTVCC (Pin 19) | 10V Gate Driver LDO Output | Bypass with ≥4.7µF ceramic cap to PGND; supplies gate drivers; includes UVLO protection (4.4V/3.9V). |
| 3V8 (Pin 24) | 3.8V Analog/Digital LDO Output | Bypass with 1nF ceramic cap to SGND; powers internal control circuitry only - not intended for external loads. |
| RUN (Pin 21) | Enable Control with Hysteresis | 1.22V enable threshold with 80mV hysteresis; internal 0.5µA pull-up + 4.5µA active pull-up for programmable hysteresis. |
| SYNC (Pin 11) | External Clock Synchronization Input | Accepts 50kHz–650kHz clock; rising edge aligns with GATE1; internal 50kΩ pull-down; active-high >1.6V. |
| CLKOUT (Pin 10) | Multi-Phase Clock Output | Daisy-chain signal for synchronizing additional LTC3862-2 controllers; phase relationship to CH1 set by PHASEMODE pin. |
| PHASEMODE (Pin 4) | Interleaving Phase Configuration | Selects CH1–CH2 phase offset: 180° (0V/float), 120° (3.8V); sets CH1–CLKOUT phase: 90°/60°/240° respectively. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved control | Reduces input/output capacitor RMS current by ~30%, enabling smaller, lower-cost bulk capacitance in high-power boost designs. |
| Programmable maximum duty cycle | Three-point selection (75%/84%/96%) via DMAX pin voltage - allows precise control of voltage conversion ratio and MOSFET conduction loss. |
| Adjustable leading-edge blanking | Configurable minimum on-time (210ns/290ns/375ns) via BLANK pin - suppresses false current-sense triggering during MOSFET turn-on transitions. |
| Internal slope compensation | Gain adjustable (0.625×/1.0×/1.66× nominal) via SLOPE pin - stabilizes current-mode control under low-duty-cycle or high-input conditions. |
| Multi-phase synchronization capability | Supports 2-, 3-, 4-, 6-, or 12-phase systems using SYNC, CLKOUT, and PHASEMODE - scales output power while maintaining low ripple and thermal distribution. |
Applications
| Telecom Power Supply | Industrial High-Voltage Bias Rail |
|---|---|
|
Use Scenario: Generating stable 48V or 80V bias rails from 24V or 36V intermediate bus in telecom line cards and optical modules. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved MOSFET switching at 300kHz to minimize EMI and capacitor heating. Use Value: Achieves >95% efficiency at 7A output while reducing input capacitance by 40% versus single-phase alternatives. |
Use Scenario: Providing regulated high-voltage supply for industrial sensors, actuators, or test equipment requiring 60–80V outputs. IC Role / Device Role / Timing Role: SEPIC controller operating in continuous conduction mode with soft-start and programmable UVLO for robust cold-start behavior. Use Value: Enables use of cost-effective 6V-gate MOSFETs via 4.4V INTVCC UVLO threshold, lowering BOM cost without sacrificing reliability. |
| Automotive ADAS Camera Power | Medical Imaging HV Supply |
|
Use Scenario: Powering image sensor bias rails in automotive surround-view cameras where input varies from 9V–16V battery range. IC Role / Device Role / Timing Role: Dual-phase boost controller with wide VIN (5.5V–36V), temperature-stable 1.223V reference, and shutdown quiescent current <10µA. Use Value: Maintains ±0.5% output regulation across –40°C to +125°C ambient, meeting AEC-Q100 Grade 1 requirements. |
Use Scenario: Generating precisely regulated 72V supply for X-ray detector bias in portable medical imaging devices. IC Role / Device Role / Timing Role: Current-mode controller with programmable leading-edge blanking and slope compensation for stable light-load operation. Use Value: Delivers <10mVpp output ripple and <0.1% line/load regulation - critical for low-noise analog front-end performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862HFE-2#TRPBF | Higher temperature grade (–40°C to +150°C junction), identical electrical specs and pinout. | Suitable for under-hood automotive or high-ambient industrial environments where extended thermal margin is required. | Select when operating ambient exceeds +125°C or long-term reliability at elevated junction temperatures is critical. |
| LTC3862IUH-2#TRPBF | Same I-grade temp range but in 5mm × 5mm QFN package (θJA = 44°C/W), no exposed pad on Pin 25 (PGND tied internally). | Better thermal performance in space-constrained layouts; requires different PCB layout and thermal pad design. | Choose for higher power density designs where board area is limited and thermal vias to inner ground planes are feasible. |
Compared with LTC3862HFE-2#TRPBF and LTC3862IUH-2#TRPBF, the LTC3862IFE-2#TRPBF offers optimal balance of industrial temperature capability, proven TSSOP thermal reliability, and drop-in compatibility with existing FE24 footprint designs - making it ideal for volume production of telecom and industrial power modules.
Availability
LTC3862IFE-2#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial high-voltage bias rails, and automotive ADAS camera power systems requiring stable component supply, long-lifecycle support, and guaranteed I-grade temperature performance.
Supply support for LTC3862IFE-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 full product support, datasheets, and application engineering for all Linear ICs including the LTC3862 family.
The LTC3862IFE-2#TRPBF belongs to Linear's high-performance power controller product line, designed specifically for demanding multi-phase, high-voltage DC/DC conversion in telecom, industrial, and automotive applications where precision, reliability, and thermal robustness are essential.
FAQ
What is the operating temperature range of the LTC3862IFE-2#TRPBF?
The LTC3862IFE-2#TRPBF is rated for an operating junction temperature range of –40°C to +125°C (I-grade). This specification is fully guaranteed across the range, with thermal performance validated per JEDEC JESD51 standards. The device uses a 24-lead TSSOP package with exposed PGND pad to achieve θJA = 38°C/W, supporting reliable operation in industrial and extended-temperature environments without derating under typical airflow conditions.
Does the LTC3862IFE-2#TRPBF support synchronization with external clocks?
Yes, the LTC3862IFE-2#TRPBF supports full PLL-based synchronization via its SYNC pin, accepting external clock frequencies from 50kHz to 650kHz. The internal PLL locks the switching frequency to the external signal, and the rising edge of SYNC aligns with the rising edge of GATE1. This capability enables precise timing coordination in multi-phase systems and noise-sensitive applications where spread-spectrum or fixed-frequency EMI reduction is required.
How does the DMAX pin affect duty cycle in the LTC3862IFE-2#TRPBF?
The DMAX pin on the LTC3862IFE-2#TRPBF directly programs the maximum duty cycle: connecting it to SGND yields 96%, leaving it floating yields 84%, and connecting it to 3V8 yields 75%. This adjustment is implemented via an internal 12× frequency clock and provides highly accurate, temperature-stable limits - critical for preventing transformer saturation or MOSFET overstress in high-gain boost configurations.
Can the LTC3862IFE-2#TRPBF be used in SEPIC topology?
Yes, the LTC3862IFE-2#TRPBF is explicitly designed to support both boost and SEPIC topologies. Its dual-channel current-mode architecture, independent SENSE+ and SENSE– inputs per channel, and flexible gate drive referencing to PGND allow direct implementation of SEPIC with coupled or uncoupled inductors. Application Note AN147 provides verified SEPIC schematics and stability guidelines for the LTC3862IFE-2#TRPBF.
What is the purpose of the 3V8 pin on the LTC3862IFE-2#TRPBF?
The 3V8 pin on the LTC3862IFE-2#TRPBF is the output of an internal 3.8V LDO powered from INTVCC. It supplies low-noise power exclusively to the IC's internal analog and digital control circuitry - including the error amplifier, PWM latch, and phase-locked loop. It must be bypassed with a 1nF ceramic capacitor to SGND and is not intended to power external components.
LTC3862IFE-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) 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-TSSOP
LTC3862IFE-2#TRPBF FAQ
1.How can I place an order for LTC3862IFE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862IFE-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 LTC3862IFE-2#TRPBF reliable?
The price and inventory of LTC3862IFE-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 LTC3862IFE-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862IFE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862IFE-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862IFE-2#TRPBF?
LTC3862IFE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862IFE-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 LTC3862IFE-2#TRPBF?
For technical support, including LTC3862IFE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862IFE-2#TRPBF requirements.
6.How does Aetrix verify that LTC3862IFE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862IFE-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 LTC3862IFE-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862IFE-2#TRPBF?
All LTC3862IFE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862IFE-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 LTC3862IFE-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862IFE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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