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Analog Devices Inc. LTC3862EFE-2#TRPBF
- Part No.:
- LTC3862EFE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3862EFE-2#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,950
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Product details
Overview
LTC3862EFE-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 10V INTVCC LDO with 4.4V UVLO rising threshold - used in high-voltage industrial power supplies requiring phase interleaving and tight output regulation.
For engineers reviewing the LTC3862EFE-2#TRPBF datasheet, LTC3862EFE-2#TRPBF pinout, LTC3862EFE-2#TRPBF application, or LTC3862EFE-2#TRPBF equivalent, key selection criteria include its dual-phase interleaved architecture, ±1% reference accuracy, 96% max duty cycle, 180° channel phase shift, and TSSOP-24 thermal performance (θJA = 38°C/W) for stable high-efficiency boost conversion.
Technical Context
The LTC3862EFE-2#TRPBF implements fixed-frequency peak current mode control with two independent channels operating 180° out-of-phase to reduce input/output ripple. Its internal 10V INTVCC LDO powers gate drivers, while a cascaded 3.8V LDO supplies analog/digital circuitry - both thermally isolated and independently bypassed per channel in multi-phase designs.
Phase synchronization is achieved via PLL-based SYNC input (50–650kHz), 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 DMAX-programmable duty cycle (75–96%) enable stable operation across wide duty-cycle and inductor-current ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 36V - enables direct integration into 12V/24V industrial bus systems without pre-regulation. |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable) - balances EMI, efficiency, and magnetics size for compact high-voltage boost designs. |
| INTVCC UVLO Threshold | Rising: 4.4V, Falling: 3.9V - ensures reliable gate drive startup for 6VGSS MOSFETs while preventing brownout-induced instability. |
| Reference Voltage Accuracy | ±1% over –40°C to 85°C - guarantees precise 80V output regulation in telecom and test equipment applications. |
| Max Duty Cycle | 96% (DMAX = SGND) - supports high step-up ratios (e.g., 12V→80V) with minimal conduction loss in high-VDS MOSFETs. |
| Current Sense Threshold | 65–85mV (typ. 75mV), ±7mV CH1–CH2 matching - enables accurate peak current limiting with low-value sense resistors (e.g., 3.3mΩ). |
| Thermal Resistance θJA | 38°C/W (TSSOP-24) - allows 3.0W dissipation at 85°C ambient before reaching 150°C junction limit. |
Pinout & Package
Package: 24-lead plastic TSSOP (FE package), 0.65mm lead pitch, exposed PGND pad (Pin 25) requiring PCB soldering for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 17, Exposed Pad 25) | Power Ground Reference | Must be connected to MOSFET source nodes and VIN/INTVCC capacitor negatives; electrically isolated from SGND to prevent ground loop noise coupling. |
| GATE1 / GATE2 (Pins 18, 16) | N-Channel MOSFET Gate Drivers | 10V rail-to-rail outputs referenced to PGND; RDS(ON) = 3Ω pull-up / 0.9Ω pull-down - drives QG ≤ 50nC MOSFETs at full frequency without external buffers. |
| SENSE1+/SENSE2+ (Pins 23, 13) | Current Sense Inputs (+) | Accept differential voltage across low-side sense resistors; trip threshold set by ITH voltage - enables cycle-by-cycle current limiting with <210ns minimum on-time (BLANK = SGND). |
| FB (Pin 8) | Error Amplifier Inverting Input | Compares output divider voltage against 1.223V internal reference; ±0.002%/V line regulation ensures stable regulation across wide input range. |
| DMAX (Pin 1) | Duty Cycle Limit Control | SGND = 96%, float = 84%, 3V8 = 75% - provides precise, temperature-stable maximum on-time control derived from 12× oscillator clock. |
| PHASEMODE (Pin 4) | Interleaving Phase Configuration | SGND/float/3V8 selects 180°/180°/120° CH1–CH2 phase offset and 90°/60°/240° CH1–CLKOUT relationship - enables scalable multi-phase system design. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output RMS current ripple by >70%, enabling smaller input capacitors and lower ESR output caps in 80V boost converters. |
| Programmable slope compensation | SLOPE pin adjusts gain (0.625× to 1.66× nominal) to stabilize current mode control under varying duty cycles and inductor values. |
| Internal 10V/3.8V dual-LDO supply | Eliminates need for external bias rails; INTVCC powers gate drivers, 3V8 powers precision analog circuitry - improves PSRR and reduces BOM count. |
| Leading-edge blanking adjustment | BLANK pin configures minimum on-time (210ns–375ns) to reject MOSFET switching noise during current sensing, improving light-load stability. |
| SYNC/CLKOUT multi-phase expansion | Supports daisy-chained 2-/3-/4-/6-/12-phase systems using single master clock - simplifies synchronization in high-power (>500W) telecom rectifiers. |
Applications
| Industrial High-Voltage Power Supply | Telecom Rectifier Module |
|---|---|
|
Use Scenario: 24V DC input boosted to regulated 80V for powering legacy telecom line cards and optical transceivers. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved gate timing, current sensing, and output voltage feedback. Use Value: 95% peak efficiency at 7A load (VIN=24V, VOUT=80V) with reduced input capacitor stress and lower thermal footprint vs. single-phase solution. |
Use Scenario: Redundant 48V-to-54V boost stage in distributed power architecture with hot-swap capability. IC Role / Device Role / Timing Role: Primary controller for dual-phase SEPIC topology delivering isolated, tightly regulated output with soft-start sequencing. Use Value: Programmable RUN pin hysteresis (80mV) and precision 1.223V reference ensure ±0.5% output accuracy across temperature and line variations. |
| Test Equipment DC Source | Automotive EV Charging Auxiliary Supply |
|
Use Scenario: Programmable 0–80V bench power supply with fast transient response and remote sense capability. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller implementing voltage loop (FB/ITH) and current limit loop (SENSE+/–). Use Value: Adjustable DMAX (75–96%) and slope compensation allow optimization for wide output voltage range while maintaining stability at light loads. |
Use Scenario: 12V battery input boosted to 48V auxiliary rail for EV onboard chargers and DC-DC converters. IC Role / Device Role / Timing Role: Dual-phase boost controller with automotive-grade temp range (–40°C to 85°C) and robust UVLO (4.4V/3.9V). Use Value: TSSOP-24 package with exposed PGND pad achieves 38°C/W θJA, enabling continuous 5A output without forced air cooling in confined enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862EGN-2#TRPBF | Same die, SSOP-24 package (θJA = 85°C/W); no exposed thermal pad. | Lower power density; suitable for lower-current (<3A) or lower-ambient designs where board space permits larger footprint. | Select when thermal budget allows higher junction temperature rise and SSOP footprint aligns with legacy layout. |
| LTC3862EUH-2#TRPBF | Same die, 5mm × 5mm QFN package (θJA = 44°C/W); exposed PGND pad with finer 0.5mm pitch. | Better thermal performance than TSSOP; requires tighter assembly process control for fine-pitch reflow. | Choose for higher-power (>6A) or space-constrained applications where improved thermal resistance justifies QFN handling complexity. |
Compared with LTC3862EGN-2#TRPBF and LTC3862EUH-2#TRPBF, the LTC3862EFE-2#TRPBF offers optimal balance of thermal performance (38°C/W), manufacturability (0.65mm pitch), and compatibility with standard TSSOP reflow profiles - making it ideal for mid-power industrial boost converters requiring reliability and ease of assembly.
Availability
LTC3862EFE-2#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifiers, and test equipment requiring stable component supply, extended temperature operation (–40°C to 85°C), and RoHS-compliant packaging.
Supply support for LTC3862EFE-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, emphasizing precision, efficiency, and ruggedness for demanding applications.
The LTC3862 product line delivers multi-phase current-mode controllers optimized for high-step-up DC/DC conversion in industrial, telecom, and test equipment - with focus on thermal robustness, wide input range, and seamless scalability.
FAQ
What is the operating temperature range for the LTC3862EFE-2#TRPBF?
The LTC3862EFE-2#TRPBF is rated for –40°C to +85°C junction temperature. Its absolute maximum junction temperature is 150°C, and thermal resistance θJA is 38°C/W in the TSSOP-24 package. Derating is required above 125°C to maintain long-term reliability, per manufacturer guidelines.
How does the DMAX pin affect duty cycle in the LTC3862EFE-2#TRPBF?
The DMAX pin on the LTC3862EFE-2#TRPBF sets maximum duty cycle: grounded = 96%, floating = 84%, tied to 3V8 = 75%. This limit is derived from a 12× internal clock and ensures precise, temperature-stable on-time control critical for high-step-up ratios like 12V→80V.
Can the LTC3862EFE-2#TRPBF synchronize to an external clock?
Yes, the LTC3862EFE-2#TRPBF accepts external synchronization via the SYNC pin over 50kHz–650kHz. The internal PLL locks to the rising edge of the SYNC signal, aligning GATE1 timing. CLKOUT provides a buffered output for daisy-chaining additional LTC3862EFE-2#TRPBF devices in multi-phase systems.
What is the purpose of the 3V8 pin on the LTC3862EFE-2#TRPBF?
On the LTC3862EFE-2#TRPBF, the 3V8 pin is the output of a secondary LDO powered from INTVCC. It supplies 3.8V to internal analog and digital circuitry (error amplifier, comparators, logic). A 1nF ceramic capacitor must be placed between 3V8 and SGND - this rail is not intended for external loads.
Does the LTC3862EFE-2#TRPBF support SEPIC topology?
Yes, the LTC3862EFE-2#TRPBF supports both boost and SEPIC topologies. Its dual-channel current-mode architecture, independent SENSE+/– inputs per channel, and programmable slope compensation make it suitable for SEPIC designs requiring high efficiency and tight regulation at 80V output.
LTC3862EFE-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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
LTC3862EFE-2#TRPBF FAQ
1.How can I place an order for LTC3862EFE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862EFE-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 LTC3862EFE-2#TRPBF reliable?
The price and inventory of LTC3862EFE-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 LTC3862EFE-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862EFE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862EFE-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862EFE-2#TRPBF?
LTC3862EFE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862EFE-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 LTC3862EFE-2#TRPBF?
For technical support, including LTC3862EFE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862EFE-2#TRPBF requirements.
6.How does Aetrix verify that LTC3862EFE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862EFE-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 LTC3862EFE-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862EFE-2#TRPBF?
All LTC3862EFE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862EFE-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 LTC3862EFE-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862EFE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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