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Analog Devices Inc. LTC3862EFE-1#PBF
- Part No.:
- LTC3862EFE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3862EFE-1#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:475
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Product details
Overview
LTC3862EFE-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. It operates from 8.5V to 36V input, delivers up to 96% duty cycle, supports 75kHz–500kHz adjustable switching frequency, and integrates dual 10V gate drivers for high-voltage power stages-used in telecom base station power supplies requiring high-efficiency step-up conversion.
For engineers reviewing the LTC3862EFE-1#PBF datasheet, LTC3862EFE-1#PBF pinout, LTC3862EFE-1#PBF application, or LTC3862EFE-1#PBF equivalent, key selection criteria include phase synchronization capability (SYNC/CLKOUT), programmable maximum duty cycle (DMAX pin), leading-edge blanking control (BLANK pin), internal 10V INTVCC LDO regulation, and thermal performance in the 24-lead TSSOP package with exposed PGND pad.
Technical Context
The LTC3862EFE-1#PBF implements fixed-frequency, peak current mode control with two independent channels operating 180° out of phase to reduce input/output ripple. Its error amplifier compares FB voltage against a ±1% 1.223V reference and drives ITH to modulate peak inductor current per channel.
Phase alignment is programmable via PHASEMODE (0V/float/3.8V), enabling 2-, 3-, 4-, 6-, or 12-phase multi-controller systems using SYNC and CLKOUT. The internal PLL allows synchronization to external clocks from 50kHz to 650kHz, while slope compensation gain is adjustable via SLOPE pin to stabilize current-mode operation across duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 8.5V to 36V - supports wide-input industrial and telecom power rails without pre-regulation. |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable) - balances efficiency vs. size of magnetics and capacitors. |
| Max Duty Cycle | Up to 96% (via DMAX pin grounded) - enables high step-up ratios (e.g., 12V→72V) with minimal dropout loss. |
| Gate Drive Voltage | 10V (INTVCC LDO) - ensures full enhancement of high-voltage N-channel MOSFETs (e.g., >100V VDS). |
| Reference Accuracy | ±1% at 1.223V (E-grade) - enables precise output voltage regulation in feedback loop design. |
| Current Sense Threshold | 60mV to 90mV (temperature- and ITH-dependent) - sets peak inductor current limit with matched channel tracking (±10mV). |
| Operating Temp | –40°C to +85°C (E-grade) - qualified for commercial/industrial ambient environments without derating. |
Pinout & Package
Package: 24-lead thermally enhanced TSSOP (FE24) with exposed PGND pad (Pin 25), 0.65mm lead pitch, θJA = 38°C/W. Exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Maximum duty cycle programming | Ground → 96%; float → 84%; 3.8V → 75% - enables precise control of boost ratio and minimum off-time. |
| GATE1 / GATE2 (Pins 18, 16) | N-channel MOSFET gate drive outputs | 10V push-pull drivers referenced to PGND - directly drive high-side switches in boost/SEPIC topologies. |
| SENSE1+/SENSE2+ (Pins 23, 13) | Positive current sense inputs | Differential inputs to current comparators - connect to high-side sense resistor for accurate peak current detection. |
| PHASEMODE (Pin 4) | Multi-phase phase relationship control | Configures CH1–CH2 phase offset (180°/180°/120°) and CH1–CLKOUT relationship (90°/60°/240°) for scalable polyphase designs. |
| SYNC (Pin 11) | External clock synchronization input | Accepts 50kHz–650kHz TTL/CMOS clock - aligns GATE1 rising edge to SYNC rising edge for EMI reduction and system-level timing coherence. |
| INTVCC (Pin 19) | 10V gate driver supply output | Internally regulated LDO output - bypass with ≥4.7µF ceramic to PGND; powers gate drivers and internal logic. |
| PGND (Pin 17 + Exposed Pad 25) | Power ground return | Low-impedance return path for MOSFET sources and INTVCC capacitor - electrically isolated from SGND to prevent noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output ripple current by ~70% vs. single-phase, allowing smaller bulk capacitors and lower ESR requirements. |
| Programmable leading-edge blanking (BLANK) | Adjusts minimum on-time (210ns/290ns/375ns) to suppress gate-drive-induced current-sense noise during MOSFET turn-on. |
| Internal 10V INTVCC LDO with UVLO | 7.5V rising UVLO threshold with 500mV hysteresis - prevents erratic gate drive during brown-out conditions. |
| Precision RUN pin with hysteresis | 1.22V enable threshold with 80mV hysteresis - enables clean, noise-immune power sequencing and soft-start initiation. |
| Adjustable slope compensation (SLOPE) | Normalized gain of 0.625/1.0/1.66 - stabilizes current-mode control across wide duty-cycle ranges and prevents subharmonic oscillation. |
Applications
| Telecom Power Supply | Industrial DC-DC Boost Converter |
|---|---|
|
Use Scenario: Step-up conversion from 24V battery backup to 48V/72V intermediate bus in 4G/5G remote radio units. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel high-voltage MOSFETs with synchronized gate drive and shared feedback loop. Use Value: Achieves >94% efficiency at 2A output while reducing output capacitor count by 50% versus single-phase implementation. |
Use Scenario: High-reliability 36V input to 72V output conversion in factory automation PLC power modules. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller with programmable DMAX and BLANK for stable light-load operation under variable load transients. Use Value: Maintains ±1% output regulation across –40°C to +85°C ambient with no external compensation required. |
| Automotive Test Equipment | Medical Imaging Power Module |
|
Use Scenario: Portable battery-powered test gear requiring 12V-to-60V boost for analog front-end bias rails. IC Role / Device Role / Timing Role: Dual-channel SEPIC controller supporting bidirectional energy flow and input voltage drop-through capability. Use Value: Enables seamless transition between battery and external supply with <100µs recovery from 100% load step. |
Use Scenario: X-ray generator subsystem needing tightly regulated 72V at 1.5A from 24V vehicle or wall input. IC Role / Device Role / Timing Role: Precision-controlled boost controller with 1.223V reference and matched current sensing for low-noise, low-ripple output. Use Value: Delivers <50mVpp output ripple and <0.5% line/load regulation critical for analog signal chain integrity. |
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#PBF | Same architecture and pinout; rated for –40°C to +125°C junction temperature. | Suitable for under-hood automotive or high-ambient industrial enclosures where extended temperature range is mandatory. | Select when operating ambient exceeds 85°C or long-term reliability at elevated junction temperatures is required. |
| LTC3862EUH-1#PBF | Identical functionality in 5mm × 5mm QFN package (UH24); θJA = 34°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 management favors QFN over TSSOP. |
Compared with LTC3862EFE-1#PBF, the I-grade variant extends operational temperature for harsh environments, while the QFN variant improves thermal resistance by 4°C/W-both retain identical control features, pin compatibility, and application circuitry, enabling direct substitution with only layout or qualification adjustments.
Availability
LTC3862EFE-1#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical imaging power supplies requiring stable component supply, long-lifecycle support, and guaranteed commercial-temperature performance.
Supply support for LTC3862EFE-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 its legacy precision power management portfolio with full datasheet, simulation model, and application support.
The LTC3862 family is designed for high-efficiency, multi-phase step-up DC/DC conversion in telecom, industrial, and test equipment-emphasizing robust current-mode control, flexible synchronization, and integrated gate drive for high-voltage N-MOSFETs.
FAQ
What is the maximum achievable output voltage using LTC3862EFE-1#PBF in a boost configuration?
The LTC3862EFE-1#PBF itself does not impose a hard upper limit on output voltage; it is determined by external component ratings (MOSFET VDS, diode PIV, capacitor WV). With 96% max duty cycle and 36V VIN, theoretical VOUT ≈ VIN/(1−D) ≈ 900V-but practical designs typically target ≤100V due to efficiency, EMI, and safety constraints. The LTC3862EFE-1#PBF has been validated in 72V output telecom applications with >94% efficiency.
Can LTC3862EFE-1#PBF operate in single-phase mode?
Yes, LTC3862EFE-1#PBF can operate in single-phase mode by tying PHASEMODE to SGND or 3.8V and leaving one gate drive unused. However, its two-phase architecture is optimized for interleaving-using only one channel forfeits ripple cancellation benefits and reduces maximum output current capability by ~50%. For true single-phase needs, consider the pin-compatible LTC3780.
Does LTC3862EFE-1#PBF require external compensation components?
Yes, LTC3862EFE-1#PBF requires external Type II or Type III compensation on the ITH node (typically R-C network from ITH to SGND and/or FB) to stabilize the current-mode control loop. The datasheet provides design equations and example values based on output filter parameters. No internal compensation is provided-the ITH pin is the error amplifier output and must be externally compensated.
How is the 10V INTVCC LDO protected against overload?
The LTC3862EFE-1#PBF's INTVCC LDO includes overcurrent limiting and thermal shutdown but no foldback or hiccup mode. Absolute maximum continuous output is 50mA RMS. Exceeding this-e.g., by driving multiple large-QG MOSFETs at high frequency-causes INTVCC voltage droop, triggering UVLO and disabling gate drive. Designers must calculate total gate charge demand (QG × fSW × 2) and ensure it stays within 50mA average.
Is LTC3862EFE-1#PBF RoHS-compliant and lead-free?
Yes, LTC3862EFE-1#PBF is RoHS-compliant and features 100% matte tin lead finish. The "#PBF" suffix explicitly denotes lead-free packaging. It is qualified for standard SnPb or lead-free reflow profiles (peak 260°C), and the exposed PGND pad must be soldered to ensure thermal performance and electrical grounding per JEDEC J-STD-020.
LTC3862EFE-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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
LTC3862EFE-1#PBF FAQ
1.How can I place an order for LTC3862EFE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862EFE-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 LTC3862EFE-1#PBF reliable?
The price and inventory of LTC3862EFE-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 LTC3862EFE-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862EFE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862EFE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862EFE-1#PBF?
LTC3862EFE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862EFE-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 LTC3862EFE-1#PBF?
For technical support, including LTC3862EFE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862EFE-1#PBF requirements.
6.How does Aetrix verify that LTC3862EFE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862EFE-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 LTC3862EFE-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862EFE-1#PBF?
All LTC3862EFE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862EFE-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 LTC3862EFE-1#PBF part is unused and in its original packaging.
Return procedure for LTC3862EFE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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