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Analog Devices Inc. LTC3862IFE-1#TRPBF
- Part No.:
- LTC3862IFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3862IFE-1#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,381
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Product details
Overview
LTC3862IFE-1#TRPBF from Analog Devices (formerly Linear Technology) is a two-phase, constant-frequency, peak current mode boost and SEPIC DC/DC controller driving external N-channel MOSFETs. It operates from 8.5V to 36V input, delivers up to 96% max duty cycle, supports 75kHz–500kHz adjustable switching frequency, and integrates dual 10V gate drivers for high-voltage MOSFETs - used in telecom power supplies requiring high-efficiency, low-noise, multi-phase step-up conversion.
For engineers reviewing the LTC3862IFE-1#TRPBF datasheet, LTC3862IFE-1#TRPBF pinout, LTC3862IFE-1#TRPBF application, or LTC3862IFE-1#TRPBF equivalent, key selection considerations include its I-grade (–40°C to +125°C) temperature rating, 24-lead TSSOP package with exposed PGND pad, phase-synchronization capability via SYNC/CLKOUT/PHASEMODE, and precise ±1% internal reference for stable output regulation.
Technical Context
The LTC3862IFE-1#TRPBF 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 internal reference, generating an ITH control voltage that sets peak inductor current. Slope compensation gain is programmable via SLOPE pin, and leading edge blanking is configurable via BLANK pin (210ns/290ns/375ns).
It features cascaded LDOs: a 10V INTVCC regulator (7.5V UVLO rising threshold) powers gate drivers, and a 3.8V 3V8 LDO powers analog/digital circuitry. Phase-lockable operation supports 2-, 3-, 4-, 6-, or 12-phase configurations using SYNC, CLKOUT, and PHASEMODE pins - enabling scalable, low-ripple power systems without external clock dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.5V to 36V - supports wide-range industrial and telecom inputs including 12V, 24V, and 32V rails. |
| Switching Frequency | 75kHz to 500kHz (adjustable via FREQ resistor) - enables optimization of size vs. efficiency in boost/SEPIC designs. |
| Max Duty Cycle | Up to 96% (via DMAX pin) - allows high step-up ratios (e.g., 12V→72V) while maintaining stability. |
| Reference Voltage | 1.223V ±1% - ensures accurate output voltage setting across temperature and line variations. |
| Gate Drive Voltage | 10V (INTVCC) - sufficient to fully enhance high-voltage N-channel MOSFETs with RDS(on) < 50mΩ. |
| Operating Temp | –40°C to +125°C (I-grade) - qualified for automotive under-hood and industrial control environments. |
| Current Sense Threshold | 65mV to 90mV (programmable via ITH) - provides precise overcurrent protection and current sharing in multi-phase setups. |
Pinout & Package
Package: 24-lead plastic TSSOP (FE24), 0.65mm lead pitch, exposed thermal pad (Pin 25) connected to PGND and required to be soldered to PCB ground for thermal performance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Duty cycle limit control | SGND = 96%, float = 84%, 3V8 = 75% - enables safe operation at high VIN/VOUT ratios. |
| GATE1/GATE2 (Pins 16,18) | N-MOSFET gate drivers | 10V, 3Ω pull-up / 0.9Ω pull-down - drives high-QG MOSFETs with fast edge rates and low shoot-through risk. |
| SENSE1+/SENSE2+ (Pins 23,13) | Current sense positive inputs | Differential sensing of source-side shunt resistors - enables accurate per-phase current monitoring and balancing. |
| SYNC (Pin 11) | External clock input | Accepts 50kHz–650kHz TTL/CMOS clock - synchronizes multiple controllers to eliminate beat frequencies and EMI peaks. |
| CLKOUT (Pin 10) | Phase-locked clock output | Drives downstream LTC3862-1 devices in daisy-chain multi-phase systems - eliminates need for external clock distribution. |
| PHASEMODE (Pin 4) | Phase relationship selector | Configures CH1–CH2 (180°/120°) and CH1–CLKOUT (90°/60°/240°) - supports 2-/3-/4-/6-/12-phase interleaving. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output ripple current by up to 50% versus single-phase, cutting capacitor count and size in telecom boost supplies. |
| Programmable slope compensation | SLOPE pin adjusts gain (0.625×/1×/1.66×) to stabilize current mode control across varying duty cycles and inductor values. |
| Internal 10V LDO with UVLO | Ensures robust gate drive even during VIN transients; 7.5V rising UVLO prevents weak turn-on of high-voltage MOSFETs. |
| Precision RUN pin with hysteresis | 1.22V enable threshold with 80mV hysteresis enables clean, bounce-free startup and shutdown sequencing in multi-rail systems. |
| Multi-phase synchronization architecture | SYNC/CLKOUT/PHASEMODE pins allow deterministic phase alignment across ≥12 phases without external logic or delay lines. |
Applications
| Telecom Power Supply | Industrial Motor Drive Bias |
|---|---|
Use Scenario: Generating 72V bias rail from 24V DC input in 48V telecom rectifier systems. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel MOSFETs, regulating output with ±1% accuracy and synchronized switching. Use Value: Reduces input capacitance by 60% and output ripple by 70% versus single-phase, meeting GR-1089 Class B conducted EMI limits. | Use Scenario: Providing isolated 48V gate drive supply for IGBT modules in servo motor inverters. IC Role / Device Role / Timing Role: High-reliability SEPIC controller delivering regulated output despite wide input variation (18V–36V) from unregulated auxiliary winding. Use Value: 125°C operation and 96% max duty cycle enable compact design with minimal heatsinking in enclosed enclosures. |
| Automotive ADAS Camera Power | Test Equipment HV Source |
Use Scenario: Stepping up 12V vehicle battery to 36V for image sensor bias in rear-view cameras. IC Role / Device Role / Timing Role: Dual-channel boost controller with soft-start and programmable blanking to suppress EMI during cold-cranking transients. Use Value: –40°C to +125°C rating and 8.5V minimum VIN ensure reliable startup during cranking; 290ns min on-time supports high-frequency operation at low loads. | Use Scenario: Programmable 10V–100V output module in automated test equipment for powering DUTs. IC Role / Device Role / Timing Role: Precision-controlled boost controller with external frequency sync for jitter-free output in calibration-grade instruments. Use Value: ±1% reference and 75kHz–500kHz frequency adjustability enable stable, low-noise outputs across full range without trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost and SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862EFE-1#TRPBF | E-grade (–40°C to +85°C); identical electrical specs and pinout | Not rated for extended temperature industrial or automotive under-hood use | Select when ambient temperature remains ≤85°C and cost sensitivity outweighs thermal margin. |
| LTC3862IUH-1#TRPBF | I-grade in 5mm × 5mm QFN (UH24); θJA = 44°C/W vs. 38°C/W for TSSOP | Better thermal performance in space-constrained layouts; requires different PCB footprint | Select when board area is limited and thermal resistance <40°C/W is critical; verify layout compatibility. |
Compared with LTC3862EFE-1#TRPBF, the LTC3862IFE-1#TRPBF adds guaranteed operation to +125°C - essential for engine bay or industrial control cabinets - while matching all electrical parameters. Versus LTC3862IUH-1#TRPBF, it trades slightly higher thermal resistance for proven manufacturability in TSSOP-based production lines and easier rework.
Availability
LTC3862IFE-1#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial motor drive bias circuits, and automotive ADAS camera power systems requiring stable component supply, long-term lifecycle support, and I-grade temperature qualification.
Supply support for LTC3862IFE-1#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, reliability, and power efficiency for demanding applications.
The LTC3862 family is designed as a high-voltage, multi-phase current mode controller platform for boost, SEPIC, and flyback-derived topologies - targeting telecom, industrial, and automotive power systems where efficiency, thermal robustness, and EMI control are critical.
FAQ
What is the maximum operating junction temperature for the LTC3862IFE-1#TRPBF?
The LTC3862IFE-1#TRPBF is rated for operation up to +150°C junction temperature (TJMAX), with guaranteed performance across –40°C to +125°C ambient. Its thermal resistance (θJA = 38°C/W in TSSOP) enables reliable operation in high-temperature environments when properly mounted with the exposed PGND pad soldered to PCB ground.
Can the LTC3862IFE-1#TRPBF synchronize to an external clock, and what is the supported frequency range?
Yes, the LTC3862IFE-1#TRPBF supports synchronization via its SYNC pin across 50kHz to 650kHz. The internal PLL locks to the external clock's rising edge, aligning GATE1 timing precisely. This enables deterministic multi-phase operation and EMI reduction in systems with master clock sources or noise-sensitive signal chains.
How does the DMAX pin affect duty cycle limiting on the LTC3862IFE-1#TRPBF?
The DMAX pin on the LTC3862IFE-1#TRPBF sets the maximum duty cycle: SGND = 96%, floating = 84%, and 3V8 = 75%. This limit derives from a 12× internal clock and ensures precise, temperature-stable duty cycle clamping - critical for preventing transformer saturation or MOSFET overstress in high-ratio boost converters.
What is the purpose of the 3V8 pin on the LTC3862IFE-1#TRPBF, and how should it be decoupled?
3V8 is the output of an internal 3.8V LDO powered from INTVCC, supplying low-voltage analog and digital circuitry. It must be decoupled with a 1nF X5R ceramic capacitor placed directly between 3V8 and SGND, adjacent to the IC. This pin is not intended to power external components and must remain isolated from other supply domains.
Does the LTC3862IFE-1#TRPBF support SEPIC topology, and what design considerations apply?
Yes, the LTC3862IFE-1#TRPBF supports SEPIC operation using its dual-channel current-mode architecture. Designers must configure both channels with coupled inductors or separate windings, ensure proper current sense placement on switch-node side, and verify slope compensation settings for stability across the full duty cycle range - especially near 50%.
LTC3862IFE-1#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):
- 8.5V ~ 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-1#TRPBF FAQ
1.How can I place an order for LTC3862IFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862IFE-1#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-1#TRPBF reliable?
The price and inventory of LTC3862IFE-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862IFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862IFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862IFE-1#TRPBF?
LTC3862IFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862IFE-1#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-1#TRPBF?
For technical support, including LTC3862IFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862IFE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3862IFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862IFE-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862IFE-1#TRPBF?
All LTC3862IFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862IFE-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862IFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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