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Analog Devices Inc. LTC3862HFE-1#TRPBF
- Part No.:
- LTC3862HFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3862HFE-1#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3862HFE-1#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 output generation. It operates from 8.5V to 36V input, delivers up to 96% duty cycle, supports 75kHz–500kHz adjustable switching frequency, and features dual 10V gate drivers - enabling robust 72V telecom power supplies and industrial HVDC systems.
For engineers reviewing the LTC3862HFE-1#TRPBF datasheet, LTC3862HFE-1#TRPBF pinout, LTC3862HFE-1#TRPBF application, or LTC3862HFE-1#TRPBF equivalent, key selection criteria include its H-grade (–40°C to +150°C) junction temperature rating, phase-lockable multi-phase synchronization (2-/3-/4-/6-/12-phase), programmable leading edge blanking, ±1% internal reference, and thermally enhanced 24-lead TSSOP package with exposed PGND pad.
Technical Context
The LTC3862HFE-1#TRPBF implements fixed-frequency peak current mode control with two interleaved channels operating 180° out of phase to reduce input/output ripple and filter component stress. Its error amplifier compares FB voltage against a 1.223V reference and drives ITH to modulate peak inductor current per channel.
It integrates two cascaded PMOS LDOs: a 10V INTVCC regulator (UVLO at 7.5V/7.0V) powering gate drivers, and a 3.8V 3V8 LDO powering analog/digital circuitry. Phase relationships are controlled via PHASEMODE, while SYNC/CLKOUT enable precise multi-phase daisy-chaining across up to 12 phases.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.5V to 36V - supports wide-range industrial and telecom inputs without pre-regulation |
| Operating Junction Temp | –40°C to +150°C - qualified for under-hood automotive and high-temp industrial environments |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable) - balances efficiency, size, and EMI in high-voltage boost designs |
| Max Duty Cycle | Up to 96% (via DMAX pin) - enables high step-up ratios (e.g., 12V→72V) with minimal dropout loss |
| Gate Drive Voltage | 10V (INTVCC) - ensures full enhancement of high-voltage N-MOSFETs (e.g., 100V+ Rds(on) devices) |
| Reference Accuracy | ±1% (1.223V) - provides tight output voltage regulation over line, load, and temperature |
| Current Sense Threshold | 60mV to 90mV (adjustable via SLOPE) - supports accurate peak-current limiting with low-value sense resistors |
Pinout & Package
Package: 24-lead thermally enhanced TSSOP (FE24) with exposed PGND pad (Pin 25), θJA = 38°C/W. Exposed pad must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Maximum duty cycle programming | SGND = 96%, float = 84%, 3V8 = 75% - sets hard limit on on-time to prevent transformer saturation or overvoltage |
| GATE1 / GATE2 (Pins 18, 16) | N-MOSFET gate drive outputs | 10V push-pull drivers referenced to PGND - directly drive high-side boost switches without level shifters |
| SENSE1+/SENSE2+ (Pins 23, 13) | Positive current sense inputs | Connect to MOSFET source side - enable per-phase current monitoring and cycle-by-cycle protection |
| PHASEMODE (Pin 4) | Interleaving phase configuration | SGND/float/3V8 selects 180°/180°/120° CH1–CH2 relationship - critical for ripple cancellation in multi-phase layouts |
| SYNC / CLKOUT (Pins 11, 10) | Multi-phase synchronization I/O | Accepts 50–650kHz external clock; outputs phase-aligned signal for stacking controllers - enables deterministic timing across phases |
| INTVCC (Pin 19) | 10V gate driver supply output | Internally regulated LDO with 7.5V UVLO - powers gate drivers; requires ≥4.7µF X5R ceramic bypass to PGND |
| 3V8 (Pin 24) | 3.8V analog/digital supply output | Derived from INTVCC; powers internal comparators, PLL, and logic - bypassed with 1nF ceramic to SGND |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output capacitor RMS current by ~30% and cuts EMI peak amplitude vs single-phase |
| Programmable slope compensation | SLOPE pin adjusts gain (0.625× to 1.66×) to stabilize current loop across wide duty cycles and inductance variations |
| Adjustable leading edge blanking | BLANK pin configures minimum on-time (210ns–375ns) to reject switch-node noise during MOSFET turn-on |
| Internal 10V/3.8V dual-LDO architecture | Eliminates need for external bias rails; INTVCC powers gate drivers, 3V8 powers precision analog blocks - improves startup reliability |
| H-grade temperature qualification | Guaranteed operation from –40°C to +150°C junction - validated for long-term reliability in sealed enclosures and high-power density systems |
Applications
| Telecom Power Supply | Industrial HVDC Distribution |
|---|---|
Use Scenario: Generating stable 48V or 72V from 24V battery or rectified AC in base station power shelves. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel MOSFETs with synchronized gate drive and shared feedback loop. Use Value: Reduces output capacitor count by 40% and lowers thermal stress on magnetics versus single-phase implementation. | Use Scenario: Step-up conversion in factory automation systems requiring 60V–80V bus for servo drives or PLC I/O modules. IC Role / Device Role / Timing Role: High-reliability SEPIC controller delivering regulated HVDC with input transient tolerance and soft-start sequencing. Use Value: 96% max duty cycle enables operation down to 8.5V input during brownouts without output droop. |
| Automotive ADAS Power | Test Equipment HV Bias |
Use Scenario: Powering radar transceivers or LiDAR laser diodes from 12V vehicle battery with strict EMI limits. IC Role / Device Role / Timing Role: Interleaved boost controller with SYNC-driven phase alignment to suppress conducted emissions at fundamental switching frequency. Use Value: 180° phase shift between channels reduces input ripple current magnitude by >90%, easing EMI filter design. | Use Scenario: Programmable HV bias supply in semiconductor ATE requiring precise 30–100V outputs with fast transient response. IC Role / Device Role / Timing Role: Precision-controlled boost controller using ITH-based current limiting and ±1% VREF for <0.5% output regulation accuracy. Use Value: Adjustable max duty cycle and slope compensation allow optimization for diverse output voltages and load profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862IFE-1#TRPBF | I-grade (–40°C to +125°C); identical electrical specs and pinout | Lower max junction temp - suitable for non-under-hood industrial but not extended-temp automotive | Select when ambient temperature stays below 105°C and cost sensitivity outweighs thermal margin |
| LTC3862HUH-1#TRPBF | H-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 and reflow profile | Choose for higher power density designs where board area is limited and thermal vias can be implemented |
Compared with LTC3862IFE-1#TRPBF, the LTC3862HFE-1#TRPBF adds 25°C junction headroom for sustained high-load operation; versus LTC3862HUH-1#TRPBF, it trades slightly higher thermal resistance for mature TSSOP assembly compatibility and lower cost in medium-volume production.
Availability
LTC3862HFE-1#TRPBF is available at Aetrix Electronics and suitable for telecom power shelves, industrial HVDC distribution systems, and automotive ADAS power modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC3862HFE-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 power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3862 family is designed specifically for high-efficiency, high-voltage boost and SEPIC DC/DC conversion in demanding environments - emphasizing thermal robustness, multi-phase scalability, and precision current-mode control.
FAQ
What is the maximum operating junction temperature for the LTC3862HFE-1#TRPBF?
The LTC3862HFE-1#TRPBF is fully specified and guaranteed over a junction temperature range of –40°C to +150°C. This H-grade rating is validated per Analog Devices' automotive and industrial qualification protocols, including extended life testing at elevated temperatures. The device incorporates thermal shutdown protection that activates above 165°C to prevent permanent damage during fault conditions. For continuous operation, derating guidelines apply above 125°C.
How does the PHASEMODE pin affect channel timing in the LTC3862HFE-1#TRPBF?
The PHASEMODE pin on the LTC3862HFE-1#TRPBF configures the phase relationship between Channel 1 and Channel 2 gate signals: grounded = 180°, floating = 180°, and tied to 3V8 = 120°. It also sets CH1-to-CLKOUT phase offset (90°/60°/240° respectively). This enables flexible interleaving topologies - 180° minimizes input/output ripple, while 120° supports 3-phase stacking with additional LTC3862HFE-1#TRPBF units via CLKOUT chaining.
Can the LTC3862HFE-1#TRPBF synchronize to an external clock outside its nominal 75kHz–500kHz range?
Yes - the SYNC input of the LTC3862HFE-1#TRPBF accepts external clocks from 50kHz to 650kHz, extending beyond its resistor-programmed oscillator range. The internal PLL locks to rising edges of the SYNC signal, aligning GATE1 timing precisely. This allows system-level frequency coordination (e.g., matching to a master clock in multi-rail power systems) and EMI spread-spectrum reduction by dithering the SYNC source.
What is the purpose of the 3V8 pin on the LTC3862HFE-1#TRPBF, and how should it be decoupled?
3V8 is the output of an internal LDO powered from INTVCC, providing a regulated 3.8V supply for all low-voltage analog and digital circuitry (error amplifier, comparators, PLL, logic). It must be decoupled with a 1nF X5R ceramic capacitor placed directly between 3V8 and SGND, as close as possible to the IC. This capacitor stabilizes the reference and sensing circuits - omitting it causes increased output voltage drift and degraded current-sense accuracy.
Does the LTC3862HFE-1#TRPBF support SEPIC topology, and what design considerations apply?
Yes - the LTC3862HFE-1#TRPBF supports SEPIC by configuring each channel with coupled inductors and appropriate capacitor placement. Its dual-channel architecture allows independent control of two SEPIC cells or a single high-current cell with interleaved switching. Key considerations include ensuring matched current sense thresholds (±10mV CH1–CH2 matching), using slope compensation to prevent subharmonic oscillation at duty cycles >50%, and routing PGND and SGND separately to avoid noise coupling into the feedback path.
LTC3862HFE-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
LTC3862HFE-1#TRPBF FAQ
1.How can I place an order for LTC3862HFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862HFE-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 LTC3862HFE-1#TRPBF reliable?
The price and inventory of LTC3862HFE-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 LTC3862HFE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862HFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862HFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862HFE-1#TRPBF?
LTC3862HFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862HFE-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 LTC3862HFE-1#TRPBF?
For technical support, including LTC3862HFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862HFE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3862HFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862HFE-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 LTC3862HFE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862HFE-1#TRPBF?
All LTC3862HFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862HFE-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 LTC3862HFE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862HFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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