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Analog Devices Inc. LTC3862EGN-1#PBF
- Part No.:
- LTC3862EGN-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3862EGN-1#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:105
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Product details
Overview
LTC3862EGN-1#PBF from Analog Devices (formerly Linear Technology) is a two-phase, constant-frequency, peak current mode step-up DC/DC controller driving external N-channel MOSFETs in boost or SEPIC topologies. 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 - enabling high-voltage power conversion for telecom and industrial 48V-to-72V systems.
For engineers reviewing the LTC3862EGN-1#PBF datasheet, LTC3862EGN-1#PBF pinout, LTC3862EGN-1#PBF application, or LTC3862EGN-1#PBF equivalent, key selection considerations include its 24-lead narrow SSOP package, phase-synchronization capability via SYNC/CLKOUT/PHASEMODE, programmable leading-edge blanking, ±1% reference accuracy, and thermal performance with θJA = 85°C/W.
Technical Context
The LTC3862EGN-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 internal architecture includes cascaded LDOs: a 10V INTVCC regulator powering gate drivers and a 3.8V 3V8 LDO supplying analog/digital circuitry - both with under-voltage lockout protection.
Phase synchronization is achieved via an internal PLL accepting 50kHz–650kHz external clocks on the SYNC pin, while multi-phase expansion (2-, 3-, 4-, 6-, or 12-phase) is enabled by CLKOUT output and PHASEMODE pin programming. Slope compensation gain, maximum duty cycle, and minimum on-time are all externally configurable via dedicated pins (SLOPE, DMAX, BLANK).
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 36V rails. |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable) - enables optimization of efficiency vs. size for magnetics and capacitors. |
| Max Duty Cycle | Up to 96% (pin-selectable: SGND=96%, float=84%, 3V8=75%) - critical for high step-up ratios like 24V→72V. |
| Reference Accuracy | ±1% over temperature - ensures stable output voltage regulation across –40°C to 85°C operating range. |
| Gate Drive Voltage | 10V (INTVCC LDO) - sufficient to fully enhance high-voltage N-channel MOSFETs with RDS(on) < 50mΩ. |
| Thermal Resistance | θJA = 85°C/W (GN24 SSOP package) - defines PCB thermal design requirements for continuous 2A output operation. |
| Operating Temperature | –40°C to +85°C (E-grade) - qualified for industrial ambient environments without derating. |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN24), 0.025" lead pitch, exposed pad connected to PGND - requires soldering exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Maximum Duty Cycle Control | Connect to SGND for 96% max duty cycle - essential for high-ratio boost applications requiring extended on-time. |
| GATE1 / GATE2 (Pins 18, 16) | N-Channel MOSFET Gate Drivers | 10V push-pull outputs referenced to PGND - drive high-side switches in boost/SEPIC without level-shifting. |
| SENSE1+/SENSE1−, SENSE2+/SENSE2− (Pins 23,22,13,14) | Current Sense Inputs | Differential inputs for low-side current sensing - enable accurate per-phase current limiting and balancing. |
| SYNC (Pin 11) / CLKOUT (Pin 10) | Phase Synchronization Interface | Accepts 50–650kHz external clock (SYNC); outputs synchronized clock (CLKOUT) for daisy-chaining multiple controllers. |
| PHASEMODE (Pin 4) | Interleaving Phase Configuration | Selects CH1–CH2 phase offset (180°, 120°, or 180°) and CH1–CLKOUT relationship - enables 2-/3-/4-/6-/12-phase scaling. |
| INTVCC (Pin 19) | 10V Gate Driver Supply | Internally regulated LDO output - must be bypassed with ≥4.7µF ceramic capacitor to PGND for stable gate drive. |
| 3V8 (Pin 24) | 3.8V Analog/Digital Supply | Secondary LDO powered from INTVCC - supplies internal error amplifier, comparators, and logic; bypass with 1nF to SGND. |
| RUN (Pin 21) | Enable/Shutdown Control | 1.22V threshold with 80mV hysteresis - allows precise power sequencing and fault-initiated shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output RMS current by ~30%, allowing smaller input capacitors and lower EMI filtering cost. |
| Programmable slope compensation (SLOPE pin) | Adjusts compensation gain (0.625×, 1×, or 1.66× nominal) to stabilize current mode control across varying duty cycles. |
| Adjustable leading-edge blanking (BLANK pin) | Configures minimum on-time (210ns/290ns/375ns) to reject MOSFET switching noise at current sense node. |
| Internal 10V/3.8V dual-LDO system | Eliminates need for external bias supplies - simplifies BOM and improves startup reliability in high-voltage systems. |
| ±1% reference voltage (VFB) | Ensures output voltage accuracy within ±1.2% over line, load, and temperature - meets tight regulation demands in telecom. |
| Multi-phase scalability via SYNC/CLKOUT | Enables seamless expansion from 2-phase to 12-phase without redesign - ideal for modular power systems and high-current servers. |
Applications
| Telecom Power Conversion | Industrial 48V-to-72V Boost |
|---|---|
Use Scenario: Converting 48V distributed supply to 72V for legacy telecom line cards and optical modules. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel N-MOSFETs with interleaved gate timing to minimize input ripple. Use Value: Achieves >94% efficiency at 2A output while reducing input capacitance by 50% versus single-phase designs. |
Use Scenario: Upgrading factory automation PLCs from 24V to 72V auxiliary rail for higher-power actuators and sensors. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller providing precise duty-cycle control and fast transient response. Use Value: 96% max duty cycle enables reliable 24V→72V conversion even at low input voltage (8.5V min). |
| Automotive Test Equipment | High-Voltage LED Driver Supply |
Use Scenario: Generating stable 60V–80V bias for automotive battery simulation and EV charger validation rigs. IC Role / Device Role / Timing Role: Dual-channel SEPIC controller supporting wide VIN range and reverse-polarity robustness. Use Value: Internal 10V gate drive ensures full enhancement of 100V+ MOSFETs without external level shifters. |
Use Scenario: Driving series-connected high-brightness LED strings requiring 60V–75V constant-current supply. IC Role / Device Role / Timing Role: Precision current-mode boost controller regulating LED current via ITH feedback loop. Use Value: ±1% VFB reference and programmable slope compensation maintain consistent brightness across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862EUH-1#PBF | Same die in 5mm × 5mm QFN (UH24) package; θJA = 44°C/W vs. 85°C/W for GN24 - superior thermal performance. | Better suited for high-power density or convection-cooled layouts where SSOP thermal limits are exceeded. | Choose when board space allows QFN and junction temperature margin is constrained below 100°C. |
| LTC3862EFE-1#PBF | Same functionality in 24-lead TSSOP (FE24); θJA = 38°C/W - intermediate thermal performance between QFN and SSOP. | Offers improved manufacturability over SSOP due to larger pitch (0.65mm vs. 0.025") and better solder joint reliability. | Prefer for high-volume production where SSOP lead coplanarity or reflow yield is a concern. |
Compared with LTC3862EGN-1#PBF, the UH24 variant delivers significantly lower thermal resistance for higher power handling, while the FE24 offers better assembly yield at moderate thermal cost - all three share identical electrical specs, pinout, and feature set.
Availability
LTC3862EGN-1#PBF is available at Aetrix Electronics and suitable for telecom power conversion, industrial 48V-to-72V boost, and automotive test equipment requiring stable component supply, long-term lifecycle support, and guaranteed E-grade (-40°C to +85°C) performance.
Supply support for LTC3862EGN-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 family is designed specifically for high-efficiency, multi-phase boost and SEPIC DC/DC conversion in telecom, industrial, and automotive applications demanding wide input range, precise regulation, and scalable phase architecture.
FAQ
What is the maximum achievable output voltage using LTC3862EGN-1#PBF in a boost configuration?
The LTC3862EGN-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). In typical applications, LTC3862EGN-1#PBF has been validated up to 72V output (e.g., 24V→72V at 2A), leveraging its 96% max duty cycle and 10V gate drive to reliably switch 100V+ MOSFETs. Higher voltages require careful layout and component derating.
Does LTC3862EGN-1#PBF support synchronization to an external clock source?
Yes, LTC3862EGN-1#PBF supports full PLL-based synchronization via its SYNC pin, accepting external clock signals from 50kHz to 650kHz. The internal PLL locks phase and frequency to the incoming signal, and the CLKOUT pin provides a synchronized output for cascading additional LTC3862EGN-1#PBF controllers in multi-phase systems - enabling deterministic timing across all phases.
How does the BLANK pin affect minimum on-time in LTC3862EGN-1#PBF?
The BLANK pin on LTC3862EGN-1#PBF directly configures minimum on-time: connecting to SGND yields 210ns, floating yields 290ns, and connecting to 3V8 yields 375ns. This setting determines the shortest controllable MOSFET turn-on period, which is critical for stability at high duty cycles and for rejecting gate-drive-induced noise at the current-sense node during switching transitions.
Can LTC3862EGN-1#PBF be used in SEPIC topology, and what modifications are required?
Yes, LTC3862EGN-1#PBF is explicitly designed for both boost and SEPIC topologies. For SEPIC use, connect the coupled inductor's second winding to the output via a capacitor, retain the same current-sense placement on the MOSFET source, and ensure the output capacitor is rated for bidirectional voltage stress. No IC configuration changes are needed - the controller's current-mode architecture and gate drive capability remain fully applicable.
What is the purpose of the PHASEMODE pin on LTC3862EGN-1#PBF, and how does it affect system operation?
The PHASEMODE pin on LTC3862EGN-1#PBF selects the phase relationship between Channel 1 and Channel 2 (180° or 120°) and between Channel 1 and CLKOUT (90°, 60°, or 240°). This enables flexible multi-phase configurations: grounding sets 180°/90° for 2-phase; floating sets 180°/60° for 3-phase; and tying to 3V8 sets 120°/240° for 4-phase - allowing scalable power delivery without changing external components.
LTC3862EGN-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- 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-SSOP
LTC3862EGN-1#PBF FAQ
1.How can I place an order for LTC3862EGN-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862EGN-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 LTC3862EGN-1#PBF reliable?
The price and inventory of LTC3862EGN-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 LTC3862EGN-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862EGN-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862EGN-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862EGN-1#PBF?
LTC3862EGN-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862EGN-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 LTC3862EGN-1#PBF?
For technical support, including LTC3862EGN-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862EGN-1#PBF requirements.
6.How does Aetrix verify that LTC3862EGN-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862EGN-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 LTC3862EGN-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862EGN-1#PBF?
All LTC3862EGN-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862EGN-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 LTC3862EGN-1#PBF part is unused and in its original packaging.
Return procedure for LTC3862EGN-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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