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Analog Devices Inc. LTC3862EGN-2#TRPBF
- Part No.:
- LTC3862EGN-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3862EGN-2#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,044
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Product details
Overview
LTC3862EGN-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 80V output, supports 75kHz–500kHz programmable switching frequency, and features internal 10V/3.8V LDOs, 180° phase shift, and 96% max duty cycle - used in high-voltage telecom power supplies requiring low input/output ripple.
For engineers reviewing the LTC3862EGN-2#TRPBF datasheet, LTC3862EGN-2#TRPBF pinout, LTC3862EGN-2#TRPBF application, or LTC3862EGN-2#TRPBF equivalent, key selection criteria include VIN range (5.5–36V), dual-phase synchronization capability, INTVCC UVLO thresholds (4.4V/3.9V), adjustable slope compensation, and SSOP-24 thermal performance (θJA = 85°C/W).
Technical Context
The LTC3862EGN-2#TRPBF implements fixed-frequency peak current mode control with two independent channels operating 180° out-of-phase to reduce input/output capacitor stress. Its internal PLL enables synchronization across 2-, 3-, 4-, 6-, or 12-phase systems via SYNC/CLKOUT/PHASEMODE pins.
It integrates cascaded LDOs: a 10V INTVCC regulator (4.4V rising UVLO, 50mA output) for gate drivers and a 3.8V LDO (bypassed with 1nF) for analog/digital circuitry. Slope compensation gain is adjustable via SLOPE pin, and minimum on-time (210–375ns) is set by BLANK pin configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 36V - supports wide-input industrial and telecom supply rails without pre-regulation. |
| Switching Frequency | 75kHz to 500kHz - set by single resistor on FREQ pin; enables optimization of size vs. efficiency trade-offs. |
| INTVCC UVLO | 4.4V (rising), 3.9V (falling) - ensures reliable gate drive startup/shutdown for 6V-rated MOSFETs. |
| Max Duty Cycle | 96% (DMAX = SGND) - enables high step-up ratios (e.g., 12V → 80V) with minimal dropout loss. |
| Reference Voltage | 1.223V ±1% - precision feedback reference enabling accurate output voltage regulation. |
| Phase Shift | 180° between CH1/CH2 - reduces input current ripple amplitude by ~70% vs. single-phase operation. |
| Min On-Time | 210ns (BLANK = SGND) - supports high-frequency, high-input-voltage boost designs with small inductors. |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN24), 0.25-inch lead pitch, θJA = 85°C/W. Exposed pad not present - thermal path relies on PCB copper area under body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Maximum duty cycle programming | SGND = 96%, float = 84%, 3V8 = 75% - sets hard limit on conduction time to prevent transformer saturation or overvoltage. |
| GATE1/GATE2 (Pins 18/16) | N-channel MOSFET gate drivers | 10V rail-referenced outputs with 3Ω pull-up / 0.9Ω pull-down - drives high-side boost switches directly. |
| SENSE1+/SENSE2+ (Pins 23/13) | Current sense positive inputs | Detect peak inductor current via external shunt; trip threshold matches within ±7mV between channels. |
| FB (Pin 8) | Error amplifier inverting input | Connects to resistive divider from VOUT; regulates output using 1.223V internal reference. |
| SYNC (Pin 11) | External clock synchronization input | Accepts 50–650kHz TTL/CMOS clock; aligns GATE1 rising edge to SYNC rising edge for multi-phase coherence. |
| PHASEMODE (Pin 4) | Inter-channel phase configuration | SGND/float/3V8 selects 180°/180°/120° CH1–CH2 relationship - enables 2-/3-/4-phase stacking with shared CLKOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input RMS current by ~30% and cuts required input capacitance by ~75% vs. single-phase. |
| Programmable slope compensation | SLOPE pin configures gain (0.625×/1.0×/1.66×) to stabilize current mode control across duty cycles. |
| Adjustable leading edge blanking | BLANK pin selects 210ns/290ns/375ns delay to reject gate-drive-induced sensing noise during MOSFET turn-on. |
| Internal dual-LDO power system | 10V INTVCC powers gate drivers; 3.8V LDO powers analog/digital core - eliminates need for external bias supplies. |
| Multi-phase scalability | SYNC/CLKOUT/PHASEMODE pins enable seamless expansion to 2-, 3-, 4-, 6-, or 12-phase systems without redesign. |
Applications
| Telecom Power Supply | Industrial HV DC-DC Converter |
|---|---|
Use Scenario: Generating +48V or +80V from 12V/24V battery or rectified AC bus in base station RF power amplifiers. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel MOSFETs, regulating output with 1.223V reference and current-mode loop stability. Use Value: 180° phase shift cuts input capacitor RMS current, enabling smaller 105°C X7R ceramics instead of larger electrolytics. | Use Scenario: Step-up conversion in factory automation PLCs requiring isolated 24V-to-72V auxiliary rails for sensors and actuators. IC Role / Device Role / Timing Role: SEPIC controller supporting wide VIN (5.5–36V) and maintaining regulation during brownouts with 4.4V INTVCC UVLO. Use Value: Adjustable DMAX (up to 96%) sustains regulation at high step-up ratios while minimizing conduction losses. |
| Automotive EV Charging Interface | Test Equipment High-Voltage Bias Supply |
Use Scenario: Onboard DC-DC stage in Level 1/2 EV chargers converting 12V vehicle battery to 30–80V control logic rails. IC Role / Device Role / Timing Role: Dual-phase boost controller with programmable soft-start (SS pin) and RUN pin hysteresis (80mV) for controlled power-up sequencing. Use Value: Internal 10V LDO eliminates external gate driver supply, reducing BOM count and improving startup reliability. | Use Scenario: Programmable high-voltage bias source in semiconductor ATE systems requiring stable 60–80V at up to 7A. IC Role / Device Role / Timing Role: Current-mode controller with precise ITH-based current limiting and ±1% VREF for tight output tolerance. Use Value: Matched current sense thresholds (±7mV) ensure balanced current sharing between phases under load transients. |
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 | 5mm × 5mm QFN package (θJA = 44°C/W); same electrical specs; no exposed PGND pad in SSOP variant. | Better thermal performance required for >5A continuous output; requires different PCB land pattern. | Select when higher power density or lower junction temperature is critical; verify layout compatibility. |
| LTC3862EFE-2#TRPBF | TSSOP-24 package (θJA = 38°C/W); identical pinout and functionality; slightly better thermal resistance than SSOP. | Preferred for legacy TSSOP footprints or where moderate thermal margin suffices. | Choose for drop-in replacement in existing TSSOP-based designs; no circuit changes needed. |
Compared with LTC3862EGN-2#TRPBF, the QFN variant offers superior thermal dissipation for high-current boost stages, while the TSSOP version provides a direct footprint upgrade path with improved θJA over SSOP - both retain identical control architecture, timing, and protection features.
Availability
LTC3862EGN-2#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial HV DC-DC converters, and automotive EV charging interfaces requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for LTC3862EGN-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 power management portfolio with rigorous qualification standards for industrial and automotive applications.
The LTC3862 family targets high-efficiency, multi-phase boost and SEPIC converter designs where input ripple reduction, wide VIN operation, and precise current-mode control are essential - especially in space-constrained telecom and test equipment.
FAQ
What is the absolute maximum input voltage rating for the LTC3862EGN-2#TRPBF?
The LTC3862EGN-2#TRPBF has an absolute maximum VIN rating of 40V. Operation above this voltage risks permanent damage. The recommended operating range remains 5.5V to 36V per datasheet specifications, ensuring reliable performance across temperature and load conditions without exceeding internal device stress limits.
Does the LTC3862EGN-2#TRPBF support synchronization to an external clock?
Yes, the LTC3862EGN-2#TRPBF supports external clock synchronization via its SYNC pin, accepting input frequencies from 50kHz to 650kHz. The internal PLL locks to the external signal, aligning the rising edge of GATE1 with the SYNC rising edge - enabling precise phase coherence in multi-phase systems using the LTC3862EGN-2#TRPBF.
What is the purpose of the DMAX pin on the LTC3862EGN-2#TRPBF?
The DMAX pin on the LTC3862EGN-2#TRPBF programs the maximum duty cycle: grounding it sets 96%, floating yields 84%, and connecting to 3V8 limits to 75%. This prevents excessive conduction time that could cause inductor saturation or output overvoltage - a critical safety and stability feature in high-ratio boost applications using the LTC3862EGN-2#TRPBF.
Can the LTC3862EGN-2#TRPBF drive logic-level MOSFETs?
The LTC3862EGN-2#TRPBF is optimized for 6V-VGS-rated high-voltage MOSFETs via its 10V INTVCC gate drive. While it can drive logic-level devices, its 4.4V INTVCC UVLO threshold may cause premature shutdown if gate drive voltage sags below spec - use only with verified 10V-gate MOSFETs or add external bias for logic-level types in designs using the LTC3862EGN-2#TRPBF.
How does the BLANK pin affect minimum on-time in the LTC3862EGN-2#TRPBF?
The BLANK pin on the LTC3862EGN-2#TRPBF configures minimum on-time: tied to SGND = 210ns, floating = 290ns, tied to 3V8 = 375ns. This blanking period masks current-sense noise during MOSFET turn-on, preventing false current-limit triggering - essential for stable operation at high switching frequencies or with fast-switching MOSFETs in the LTC3862EGN-2#TRPBF.
LTC3862EGN-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC3862EGN-2#TRPBF FAQ
1.How can I place an order for LTC3862EGN-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862EGN-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 LTC3862EGN-2#TRPBF reliable?
The price and inventory of LTC3862EGN-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 LTC3862EGN-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862EGN-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862EGN-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862EGN-2#TRPBF?
LTC3862EGN-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862EGN-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 LTC3862EGN-2#TRPBF?
For technical support, including LTC3862EGN-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862EGN-2#TRPBF requirements.
6.How does Aetrix verify that LTC3862EGN-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862EGN-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 LTC3862EGN-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862EGN-2#TRPBF?
All LTC3862EGN-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862EGN-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 LTC3862EGN-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862EGN-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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