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Analog Devices Inc. LTC3862EFE-2#PBF
- Part No.:
- LTC3862EFE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3862EFE-2#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:101
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Product details
Overview
LTC3862EFE-2#PBF from Analog Devices (formerly Linear Technology) is a two-phase, constant-frequency, 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 adjustable switching frequency, and features 180° phase-shifted dual channels to reduce input/output ripple. It is used in telecom power supplies requiring stable 80V bus generation from 24V or 32V rails.
For engineers reviewing the LTC3862EFE-2#PBF datasheet, LTC3862EFE-2#PBF pinout, LTC3862EFE-2#PBF application, or LTC3862EFE-2#PBF equivalent, key selection criteria include its 2-phase peak-current-mode architecture, programmable maximum duty cycle (75–96%), internal 10V/3.8V dual LDOs, ±1% reference accuracy, and TSSOP-24 thermal performance (θJA = 38°C/W).
Technical Context
The LTC3862EFE-2#PBF implements fixed-frequency peak-current-mode control with two independent channels operating 180° out-of-phase. Its error amplifier compares FB voltage against a 1.223V reference and drives ITH to modulate peak inductor current; slope compensation gain is programmable via SLOPE pin (0.625× to 1.66× nominal).
It integrates cascaded PMOS LDOs: INTVCC (10V, 50mA max) powers gate drivers, while 3V8 (3.8V) supplies analog/digital circuitry. UVLO thresholds are 4.4V (rising) and 3.9V (falling) on INTVCC, enabling reliable operation with 6VGSS MOSFETs. Phase synchronization uses PLL-based SYNC/CLKOUT with PHASEMODE-selectable 2-/3-/4-/6-/12-phase daisy-chaining.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 36V - supports wide-input industrial and telecom rails without pre-regulation. |
| Switching Frequency | 75kHz to 500kHz - set by single resistor on FREQ pin; enables optimization of size vs. efficiency. |
| Max Duty Cycle | 75% to 96% - selectable via DMAX pin; allows flexible VOUT/VIN ratio design (e.g., 80V from 24V). |
| Reference Voltage | 1.223V ±1% - high-accuracy FB threshold ensures tight output regulation across temperature. |
| INTVCC UVLO | 4.4V (rising), 3.9V (falling) - protects gate drive integrity during brown-out conditions. |
| Min On-Time | 210ns to 375ns - adjustable via BLANK pin; supports high-VOUT/low-VIN operation at high frequencies. |
| Phase Relationship | 180° CH1–CH2 - reduces input capacitor RMS current and EMI in multi-phase configurations. |
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 performance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 25) | Power Ground | Exposed thermal pad tied to PGND; must be soldered to PCB ground plane for rated thermal performance and low-impedance return path for MOSFET sources. |
| GATE1 / GATE2 (Pins 18, 16) | N-Channel MOSFET Gate Drivers | 10V gate drive referenced to PGND; capable of driving high-QG MOSFETs with RDS(ON) rated at 6VGS. |
| SENSE1+/SENSE2+ (Pins 23, 13) | Current Sense Inputs (+) | Differential inputs to peak-current comparators; connect to top of sense resistors for per-phase current monitoring. |
| FB (Pin 8) | Error Amplifier Inverting Input | Connects to resistive divider from VOUT; sets regulated output voltage as VOUT = 1.223V × (1 + R1/R2). |
| ITH (Pin 7) | Error Amplifier Output | Drives current comparator threshold; also used for loop compensation via RC network from ITH to SGND. |
| DMAX (Pin 1) | Maximum Duty Cycle Control | Ground → 96%, float → 84%, 3V8 → 75%; precise limit derived from 12× internal clock for accurate timing. |
| PHASEMODE (Pin 4) | Multi-Phase Configuration | SGND/float/3V8 selects 180°/180°/120° CH1–CH2 phase shift and corresponding CLKOUT alignment for scalable polyphase systems. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase current-mode control | Reduces input/output capacitor RMS current by ~30% vs. single-phase, lowering component count and board area. |
| Programmable slope compensation | SLOPE pin adjusts gain (0.625× to 1.66×) to stabilize current loop across varying duty cycles and inductor values. |
| Dual integrated LDOs (10V/3.8V) | Eliminates need for external bias supplies; 10V INTVCC enables robust gate drive for high-RDS(ON) MOSFETs. |
| Adjustable leading-edge blanking | BLANK pin configures minimum on-time (210–375ns) to reject gate-drive-induced noise during MOSFET turn-on. |
| SYNC/CLKOUT for multi-phase scaling | Enables seamless expansion to 2-, 3-, 4-, 6-, or 12-phase systems using single master clock and daisy-chained CLKOUT. |
Applications
| Telecom Power Supply | Industrial HV Bias Supply |
|---|---|
|
Use Scenario: Generating stable 80V DC bus from 24V or 32V intermediate rail in LTE base station RF power amplifiers. IC Role / Device Role / Timing Role: Two-phase boost controller regulating output voltage with synchronized gate drive and current-mode stability. Use Value: 180° phase shift cuts input capacitor ripple current by 50%, reducing required capacitance and improving reliability under high-temp operation. |
Use Scenario: Providing isolated 60–100V bias for industrial sensor front-ends and precision ADC reference buffers. IC Role / Device Role / Timing Role: SEPIC-mode controller delivering regulated high-voltage output with no polarity inversion and inherent input-output isolation. Use Value: Adjustable DMAX (up to 96%) and programmable frequency enable optimal trade-off between transformer size and efficiency at 75–300kHz. |
| Automotive ADAS Camera Power | Test Equipment HV Source |
|
Use Scenario: Powering 72V image sensor arrays in automotive surround-view cameras from 12V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Boost controller with 4.4V INTVCC UVLO ensuring operation down to 6V input during cranking transients. Use Value: Internal 10V LDO sustains full gate drive strength even at low VIN, maintaining MOSFET RDS(ON) and minimizing conduction loss. |
Use Scenario: Programmable HV source in automated test equipment requiring precise 40–80V outputs with fast load-step response. IC Role / Device Role / Timing Role: Current-mode controller with ±1% reference and soft-start (SS pin) enabling repeatable, glitch-free voltage ramping. Use Value: ITH pin accessibility allows direct loop compensation tuning for <10µs transient recovery under 1A load steps. |
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#PBF | Same die, 24-pin SSOP package (θJA = 85°C/W); no exposed thermal pad. | Lower power density applications where thermal budget allows higher junction rise. | Select when board space permits larger footprint and thermal derating is acceptable. |
| LTC3862EUH-2#PBF | Same die, 5mm × 5mm QFN package (θJA = 44°C/W); exposed PGND pad, finer 0.65mm pitch. | Better thermal performance than TSSOP; suited for compact, high-power-density layouts. | Prefer for space-constrained designs needing lower θJA and improved thermal coupling to PCB. |
Compared with LTC3862EFE-2#PBF, the GN-24 variant trades thermal performance for legacy SSOP compatibility, while the UH-24 QFN offers superior heat dissipation in minimal area-both retain identical control functionality, pinout mapping, and electrical specs.
Availability
LTC3862EFE-2#PBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial HV bias generation, and automotive ADAS camera power systems requiring stable component supply and long-term production continuity.
Supply support for LTC3862EFE-2#PBF 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, documentation, and manufacturing continuity for all Linear power ICs.
The LTC3862-2 family was designed specifically for high-efficiency, multi-phase boost and SEPIC DC/DC conversion in telecom, industrial, and automotive applications demanding precise voltage regulation and scalable phase architecture.
FAQ
What is the operating temperature range for the LTC3862EFE-2#PBF?
The LTC3862EFE-2#PBF is rated for –40°C to +85°C junction temperature. This E-grade version is specified over the full industrial temperature range and validated for reliable operation in telecom and industrial environments where ambient temperatures remain within this envelope. Derating applies above 125°C junction.
How does the DMAX pin affect duty cycle in the LTC3862EFE-2#PBF?
The DMAX pin on the LTC3862EFE-2#PBF directly programs the maximum duty cycle: grounding sets 96%, floating yields 84%, and connecting to 3V8 limits it to 75%. This adjustment is implemented via an internal 12× clock, ensuring precise, temperature-stable duty cycle limiting critical for high-VOUT/VIN ratios in the LTC3862EFE-2#PBF.
Can the LTC3862EFE-2#PBF synchronize to an external clock?
Yes, the LTC3862EFE-2#PBF supports external synchronization via its SYNC pin, accepting input clocks from 50kHz to 650kHz. The internal PLL aligns GATE1's rising edge to the SYNC rising edge, enabling deterministic timing across multiple phases or with system clocks-essential for EMI reduction and deterministic power sequencing in the LTC3862EFE-2#PBF.
What is the purpose of the 3V8 pin on the LTC3862EFE-2#PBF?
The 3V8 pin on the LTC3862EFE-2#PBF is the output of an internal LDO powered from INTVCC, providing a regulated 3.8V supply exclusively for low-voltage analog and digital control circuitry. It must be bypassed with a 1nF ceramic capacitor to SGND and is not intended to power external components-ensuring noise isolation and stable internal bias for the LTC3862EFE-2#PBF's error amplifier and logic.
Does the LTC3862EFE-2#PBF support SEPIC topology?
Yes, the LTC3862EFE-2#PBF supports both boost and SEPIC topologies using the same two-phase current-mode architecture. Its dual gate drivers, independent current sense inputs (SENSE1±, SENSE2±), and flexible feedback configuration allow direct implementation of non-inverting SEPIC converters-commonly used in automotive and industrial applications requiring input-output isolation in the LTC3862EFE-2#PBF.
LTC3862EFE-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3862EFE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862EFE-2#PBF 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#PBF reliable?
The price and inventory of LTC3862EFE-2#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862EFE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862EFE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862EFE-2#PBF?
LTC3862EFE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862EFE-2#PBF 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#PBF?
For technical support, including LTC3862EFE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862EFE-2#PBF requirements.
6.How does Aetrix verify that LTC3862EFE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862EFE-2#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862EFE-2#PBF?
All LTC3862EFE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862EFE-2#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3862EFE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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