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Analog Devices Inc. LTC3862IFE-1#PBF
- Part No.:
- LTC3862IFE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3862IFE-1#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:234
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Product details
Overview
LTC3862IFE-1#PBF 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 power conversion. 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 with internal 10V/3.8V LDOs - used in telecom base station power supplies delivering 72V at 2A.
For engineers reviewing the LTC3862IFE-1#PBF datasheet, LTC3862IFE-1#PBF pinout, LTC3862IFE-1#PBF application, or LTC3862IFE-1#PBF equivalent, key selection criteria include phase synchronization capability (SYNC/CLKOUT/PHASEMODE), programmable leading-edge blanking (BLANK), slope compensation gain control (SLOPE), ±1% reference accuracy, and thermal performance in industrial temperature range (–40°C to 125°C).
Technical Context
The LTC3862IFE-1#PBF implements fixed-frequency, peak current mode control with two interleaved channels operating 180° out of phase, reducing input/output ripple and filter component stress. Its error amplifier (EA) compares FB voltage against a 1.223V internal reference and drives ITH to modulate peak inductor current per channel.
It features a cascaded LDO architecture: VIN powers a 10V INTVCC LDO (7.5V UVLO rising threshold) for gate drivers, which in turn powers a 3.8V LDO (3V8) for analog/digital circuitry. Phase alignment is controlled via PHASEMODE (0V/float/3V8), while PLL-based synchronization accepts 50kHz–650kHz external clocks on SYNC.
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 |
| Max Duty Cycle | 96% (DMAX = SGND) - enables high step-up ratios (e.g., 24V → 72V) with minimal dropout loss |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable) - balances efficiency, size, and EMI in space-constrained designs |
| Reference Voltage Accuracy | ±1% (1.223V typ) - ensures tight output voltage regulation across load and temperature |
| Gate Drive Voltage | 10V (INTVCC) - fully enhances high-voltage N-channel MOSFETs (e.g., >100V VDS) with low RDS(ON) |
| Operating Temperature | –40°C to +125°C (I-grade) - qualified for under-hood automotive and industrial ambient environments |
| Current Sense Threshold | 60mV to 90mV (adjustable via ITH) - sets precise peak current limit with <10mV CH1–CH2 matching |
Pinout & Package
Package: 24-lead plastic TSSOP (FE24), thermally enhanced, exposed pad (Pin 25) connected to PGND and required to be soldered to PCB for thermal and electrical performance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Max Duty Cycle Control | SGND = 96%, float = 84%, 3V8 = 75% - sets hard upper bound on on-time to prevent instability or overvoltage |
| PHASEMODE (Pin 4) | Interleaving Configuration | Selects CH1–CH2 phase offset: 0V/float = 180°, 3V8 = 120° - enables 2-/3-/4-/6-/12-phase multi-controller systems |
| CLKOUT (Pin 10) | Phase-Synchronized Clock Output | Drives SYNC of downstream LTC3862-1 ICs - maintains precise timing alignment across phases without external jitter |
| BLANK (Pin 3) | Leading Edge Blanking Control | SGND = 210ns min on-time, float = 290ns, 3V8 = 375ns - suppresses gate-drive-induced sensing noise during switch turn-on |
| SLOPE (Pin 2) | Slope Compensation Gain | SGND = –37.5%, float = 0%, 3V8 = +66% normalized gain - stabilizes current mode control at high duty cycles |
| SENSE1+/SENSE1– (Pins 23/22) | Channel 1 Current Sensing | Differential input for external sense resistor - rejects common-mode noise and enables accurate peak current detection |
| GATE1/GATE2 (Pins 18/16) | N-Channel MOSFET Drivers | 10V, 3Ω pull-up / 0.9Ω pull-down - delivers fast, robust gate drive for high-QG MOSFETs with low shoot-through risk |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output RMS current by ~30%, enabling smaller input capacitors and lower ESR output caps |
| Programmable max duty cycle (96%) | Supports ultra-high step-up ratios (e.g., 12V→72V) while maintaining loop stability and avoiding subharmonic oscillation |
| Internal 10V/3.8V dual LDOs | Eliminates need for external bias rails; INTVCC powers gate drivers, 3V8 powers precision analog circuitry - improves PSRR and noise immunity |
| PLL-based synchronization (50–650kHz) | Enables deterministic multi-phase timing across multiple controllers - critical for EMI reduction and system-level clock domain alignment |
| Precision RUN pin with 80mV hysteresis | Provides clean, noise-immune enable/disable with controlled startup sequencing and brown-out recovery behavior |
Applications
| Telecom Power Supply | Industrial Motor Drive Bias |
|---|---|
Use Scenario: Generating isolated 72V auxiliary rail from 24V backplane in 48V telecom systems. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel MOSFETs, synchronized via CLKOUT/SYNC to minimize conducted EMI. Use Value: Achieves >94% efficiency at 2A load with 30% smaller input capacitance vs single-phase design. |
Use Scenario: Providing regulated 48V gate bias for IGBT half-bridge drivers in servo motor inverters. IC Role / Device Role / Timing Role: SEPIC controller operating in continuous conduction mode with programmable DMAX limiting peak stress during transients. Use Value: Maintains stable 48V output across 18–36V input variation while supporting 100% duty cycle margin for fault recovery. |
| Automotive ADAS Camera Power | Test Equipment High-Voltage Source |
Use Scenario: Powering 60V image sensor array in automotive surround-view camera modules. IC Role / Device Role / Timing Role: Interleaved boost controller with thermal shutdown and precise UVLO (7.5V INTVCC) for cold-crank robustness. Use Value: Operates reliably from –40°C to +125°C junction temp; 96% max duty cycle sustains output during 6V battery dips. |
Use Scenario: Programmable 30–100V DC source in automated test equipment requiring fast transient response. IC Role / Device Role / Timing Role: Adjustable-frequency boost controller with soft-start (SS pin) and leading-edge blanking (BLANK) for clean turn-on under capacitive loads. Use Value: Enables <100µs output settling time with <1% overshoot using ITH-based current limiting and slope compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862EFE-1#PBF | Same silicon, –40°C to +85°C grade, lower cost | Not rated for extended industrial or automotive ambient temperatures | Select when operating junction stays ≤85°C and cost sensitivity outweighs thermal margin |
| LTC3862IUH-1#PBF | Same functionality, 5mm × 5mm QFN package (UH24), θJA = 44°C/W | Better thermal performance than TSSOP; requires different PCB footprint and reflow profile | Choose for higher power density or improved thermal headroom in compact layouts |
Compared with LTC3862EFE-1#PBF, the LTC3862IFE-1#PBF adds guaranteed operation to +125°C junction temperature and tighter parameter limits over that range; compared with LTC3862IUH-1#PBF, it trades slightly higher thermal resistance for mature TSSOP assembly compatibility and lower board-level EMI due to larger ground plane area.
Availability
LTC3862IFE-1#PBF 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 across extended temperature ranges and long production lifecycles.
Supply support for LTC3862IFE-1#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 the LTC portfolio.
The LTC3862-1 family is designed specifically for high-efficiency, multi-phase boost and SEPIC DC/DC conversion in demanding industrial, telecom, and automotive applications where input voltage range, thermal robustness, and precise current-mode control are critical.
FAQ
What is the maximum operating junction temperature for the LTC3862IFE-1#PBF?
The LTC3862IFE-1#PBF is rated for operation up to +125°C junction temperature (I-grade). Its absolute maximum TJ is 150°C, but sustained operation above 125°C degrades reliability. Thermal design must ensure TJ ≤ 125°C under worst-case load, ambient, and airflow conditions - verified using PDISS = VIN × (IQ + QG × f) and TJ = TA + PDISS × θJA.
How does the PHASEMODE pin affect multi-phase configuration in the LTC3862IFE-1#PBF?
The PHASEMODE pin on the LTC3862IFE-1#PBF selects inter-channel phase offset: 0V or floating sets 180° (2-phase), 3V8 sets 120° (3-phase). When daisy-chaining multiple LTC3862IFE-1#PBF controllers, CLKOUT of master drives SYNC of slaves, and PHASEMODE configures relative timing - enabling deterministic 2-, 3-, 4-, 6-, or 12-phase systems without external timing ICs.
Can the LTC3862IFE-1#PBF be used in SEPIC topology, and what design considerations apply?
Yes, the LTC3862IFE-1#PBF supports SEPIC operation using its dual-channel current-mode architecture. Key considerations include connecting SENSE1+/SENSE1– across the primary-side current-sense resistor, configuring DMAX to limit peak capacitor voltage stress, and ensuring slope compensation (SLOPE pin) is set appropriately for CCM operation - especially at high duty cycles where right-half-plane zero compensation is critical.
What is the purpose of the BLANK pin on the LTC3862IFE-1#PBF, and how does it impact minimum on-time?
The BLANK pin on the LTC3862IFE-1#PBF controls leading-edge blanking duration to suppress false current-sense triggering during MOSFET turn-on. Connecting BLANK to SGND yields 210ns minimum on-time, float gives 290ns, and 3V8 extends to 375ns. This directly affects light-load efficiency and minimum achievable output voltage in boost configurations - critical for maintaining regulation at very low currents.
Does the LTC3862IFE-1#PBF require external components for soft-start, and how is it implemented?
Yes, soft-start for the LTC3862IFE-1#PBF is implemented externally via a capacitor from SS pin to SGND. An internal 5µA current source charges this capacitor, linearly ramping the ITH voltage and thus the peak inductor current. Typical values range from 10nF to 100nF, setting soft-start duration between ~20µs and 200µs - preventing inrush current and output overshoot during power-up.
LTC3862IFE-1#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):
- 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#PBF FAQ
1.How can I place an order for LTC3862IFE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862IFE-1#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 LTC3862IFE-1#PBF reliable?
The price and inventory of LTC3862IFE-1#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862IFE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862IFE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862IFE-1#PBF?
LTC3862IFE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862IFE-1#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 LTC3862IFE-1#PBF?
For technical support, including LTC3862IFE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862IFE-1#PBF requirements.
6.How does Aetrix verify that LTC3862IFE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862IFE-1#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 LTC3862IFE-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862IFE-1#PBF?
All LTC3862IFE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862IFE-1#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 LTC3862IFE-1#PBF part is unused and in its original packaging.
Return procedure for LTC3862IFE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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