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Analog Devices Inc. LTC3862EFE#TRPBF
- Part No.:
- LTC3862EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3862EFE#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,737
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Product details
Overview
LTC3862EFE#TRPBF from Analog Devices is a two-phase, constant-frequency, peak current mode boost/SEPIC DC/DC controller driving N-channel MOSFETs. It operates from 4V to 36V input, delivers up to 96% max duty cycle, supports 75kHz–500kHz adjustable switching frequency, and integrates dual 5V gate drivers with internal 5V/3.8V LDOs. It enables high-efficiency 48V telecom power supplies with reduced input/output filtering.
For engineers reviewing the LTC3862EFE#TRPBF datasheet, LTC3862EFE#TRPBF pinout, LTC3862EFE#TRPBF application, or LTC3862EFE#TRPBF equivalent, key selection criteria include phase synchronization capability (SYNC/CLKOUT), programmable DMAX/SLOPE/BLANK, multi-phase scalability (2-/3-/4-/6-/12-phase), and AEC-Q100-qualified temperature grade compatibility.
Technical Context
The LTC3862EFE#TRPBF implements fixed-frequency, peak current mode control with two interleaved channels operating 180° out of phase. Its error amplifier (EA) compares FB voltage against a ±1% 1.223V reference and drives ITH to modulate peak inductor current. Slope compensation gain is externally programmable via SLOPE pin (0.625× to 1.66× nominal), and leading-edge blanking time is selectable (180ns/260ns/340ns) via BLANK pin.
Phase relationships are configured by PHASEMODE (0V/float/3.8V), enabling 180°/180°/120° CH1–CH2 alignment and 90°/60°/240° CH1–CLKOUT alignment. The internal PLL allows synchronization to external clocks from 50kHz to 650kHz at SYNC, while FREQ pin sets base frequency with a single resistor. DMAX pin precisely limits duty cycle using a 12× internal clock.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Switching Frequency | 75kHz to 500kHz - set by external resistor on FREQ pin; enables optimization of size vs. efficiency trade-offs. |
| Max Duty Cycle | Up to 96% - configurable via DMAX pin (SGND = 96%, float = 84%, 3V8 = 75%), critical for high-step-up ratios like 12V→48V. |
| Gate Drive Voltage | 5V (INTVCC) - optimized for logic-level N-MOSFETs; eliminates need for external level-shifting or bootstrap circuits. |
| Reference Accuracy | ±1% at 1.223V - ensures tight output voltage regulation across temperature and load in feedback loop design. |
| Current Sense Threshold | 65mV to 90mV (typ.) - matched ±10mV between channels; enables accurate current sharing in multi-phase configurations. |
| Operating Temp Range | –40°C to +85°C - E-grade qualification suitable for commercial and industrial ambient environments. |
Pinout & Package
Package: 24-lead thermally enhanced TSSOP (FE package), 0.65mm lead pitch, exposed PGND pad soldered to PCB for thermal performance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Duty cycle limit control | Directly programs max on-time: SGND = 96%, float = 84%, 3V8 = 75%; precision derived from 12× internal clock. |
| GATE1 / GATE2 (Pins 18/16) | N-MOSFET gate drive outputs | 5V logic-level outputs referenced to PGND; each capable of driving QG > 50nC MOSFETs with low RDS(ON) pull-up/pull-down. |
| SENSE1+/SENSE2+ (Pins 23/13) | Positive current sense inputs | High-side current sensing inputs for peak current mode control; matched threshold minimizes channel imbalance. |
| FB (Pin 8) | Error amplifier inverting input | Connects to resistive divider from VOUT; sets regulated output voltage with ±1% reference accuracy. |
| SYNC (Pin 11) | External clock synchronization input | Accepts 50kHz–650kHz TTL/CMOS clock; rising edge aligns with GATE1 for deterministic multi-phase timing. |
| CLKOUT (Pin 10) | Phase-locked clock output | Drives downstream LTC3862 devices in daisy-chained multi-phase systems; phase relationship controlled by PHASEMODE. |
| PGND (Pin 17 + Exposed Pad) | Power ground return | Must be connected to MOSFET source nodes and INTVCC bypass capacitor; exposed pad requires soldering for thermal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output ripple current by ~70% vs. single-phase, enabling smaller capacitors and inductors in 48V telecom supplies. |
| Programmable slope compensation | SLOPE pin adjusts gain (0.625× to 1.66×) to stabilize current mode control across varying duty cycles and inductor values. |
| Adjustable minimum on-time | BLANK pin selects 180ns/260ns/340ns blanking window to suppress gate-drive-induced noise during MOSFET turn-on. |
| Internal dual-LDO architecture | 5V INTVCC powers gate drivers; 3.8V 3V8 powers analog/digital circuitry - eliminates need for external bias rails and improves PSRR. |
| Multi-phase scalability | SYNC/CLKOUT/PHASEMODE pins enable seamless expansion to 2-, 3-, 4-, 6-, or 12-phase systems without redesigning control loop compensation. |
Applications
| Telecom Power Supply | Automotive ADAS Power |
|---|---|
Use Scenario: Generating stable 48V bus from 12V vehicle battery for radar/LiDAR modules. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved inductor currents and synchronized gate drive timing. Use Value: Achieves >94% efficiency at 5A output while reducing EMI and input capacitance by 50% vs. single-phase designs. | Use Scenario: High-reliability 24V-to-48V conversion in camera ECU power management. IC Role / Device Role / Timing Role: AEC-Q100-qualified boost controller providing fault-tolerant, temperature-stable voltage regulation. Use Value: Maintains ±1% output accuracy over –40°C to +85°C and supports diagnostic RUN pin hysteresis for safe startup/shutdown sequencing. |
| Industrial PoE++ Midspan | Medical Imaging Power |
Use Scenario: Delivering up to 90W ([email protected]) to IEEE 802.3bt Type 4 PDs from 36V DC input. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller with programmable DMAX and soft-start for inrush limiting. Use Value: Enables precise current limiting and fast transient response (<50µs recovery) required for PoE++ Class 8 compliance. | Use Scenario: Low-noise, high-stability 48V supply for ultrasound transducer biasing circuits. IC Role / Device Role / Timing Role: Dual-channel boost controller with matched current sensing and independent PGND routing. Use Value: Minimizes channel-to-channel current mismatch (<±10mV) to ensure uniform transducer excitation and image fidelity. |
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#TRPBF | Wider operating junction temperature range (–40°C to +125°C); identical pinout, features, and electrical specs. | Required for under-hood automotive or high-ambient industrial deployments where sustained >85°C case temperature occurs. | Select when extended thermal margin is mandatory; otherwise LTC3862EFE#TRPBF suffices for commercial/industrial use. |
| LTC3862-1EFE#TRPBF | Higher INTVCC UVLO (7.5V rising) and different RUN thresholds; designed for standard-threshold MOSFETs, not logic-level. | Used where 10V gate drive is needed for high-VDS MOSFETs in >60V output applications; incompatible with 5V gate drive requirement. | Only choose if replacing standard-threshold MOSFETs; not a functional substitute for LTC3862EFE#TRPBF's logic-level drive architecture. |
Compared with LTC3862IFE#TRPBF, the LTC3862EFE#TRPBF offers identical functionality at lower cost and thermal derating for ambient-limited applications; versus LTC3862-1EFE#TRPBF, it provides optimized 5V gate drive and lower UVLO for logic-level FETs - making it the correct choice for 48V telecom and ADAS boost designs.
Availability
LTC3862EFE#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive ADAS subsystems, and industrial PoE++ midspans requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3862EFE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3862 product line delivers high-efficiency, multi-phase DC/DC controllers for step-up and SEPIC topologies, specifically engineered for high-density, low-EMI 48V intermediate bus generation in next-generation telecom and automotive systems.
FAQ
What is the maximum achievable output voltage using LTC3862EFE#TRPBF in a boost configuration?
The LTC3862EFE#TRPBF itself does not impose a hard upper limit on output voltage; instead, practical maximum VOUT depends on external component ratings (MOSFET VDS, diode PIV, capacitor WV) and stability constraints. In published typical applications, LTC3862EFE#TRPBF achieves 48V output from 12V input at 5A with >94% efficiency. For higher outputs, careful attention to layout, slope compensation, and duty cycle limitation (via DMAX pin) is required to maintain stability and avoid subharmonic oscillation.
Does LTC3862EFE#TRPBF support SEPIC topology, and what modifications are needed versus boost?
Yes, LTC3862EFE#TRPBF supports SEPIC topology per its datasheet description and typical application circuits. Unlike boost, SEPIC requires coupling capacitors between input and output paths and separate inductors for each channel. The controller's current sensing, gate drive, and feedback architecture remain unchanged; only the power stage layout and component selection differ. No pin configuration or firmware changes are needed - the same LTC3862EFE#TRPBF device operates identically in both topologies.
How is thermal performance affected by the exposed pad connection on LTC3862EFE#TRPBF?
The exposed pad of the LTC3862EFE#TRPBF (Pin 25) is electrically and thermally connected to PGND and must be soldered to a PCB copper pour for rated thermal performance. Without proper soldering, θJA degrades from 38°C/W to >60°C/W, risking thermal shutdown above 125°C junction temperature. Analog Devices specifies minimum solder mask opening and thermal via count (≥6 vias, 0.3mm diameter) to ensure reliable heat transfer from die to board in continuous 5A operation.
Can LTC3862EFE#TRPBF synchronize to an external clock while also operating in two-phase interleaved mode?
Yes, LTC3862EFE#TRPBF fully supports simultaneous external synchronization and two-phase interleaving. When SYNC receives an external clock (50kHz–650kHz), the internal PLL locks all internal timing - including both channel clocks and CLKOUT - to that reference. PHASEMODE pin configures the 180° phase offset between GATE1 and GATE2, preserving interleaving while ensuring deterministic alignment to the master clock, essential for EMI reduction in multi-unit systems.
What is the purpose of the 3V8 pin on LTC3862EFE#TRPBF, and can it power external circuitry?
3V8 is the output of an internal 3.8V LDO powered from INTVCC, dedicated solely to powering the LTC3862EFE#TRPBF's internal analog and digital control circuitry. It is not rated for external loads: the datasheet explicitly states "This LDO is not intended to be used as a supply for external circuitry." Bypassing with a 1nF ceramic capacitor to SGND is mandatory for noise immunity, but connecting external ICs risks instability, insufficient current (no spec'd output current), and violation of recommended operating conditions.
LTC3862EFE#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):
- 4V ~ 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#TRPBF FAQ
1.How can I place an order for LTC3862EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862EFE#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 LTC3862EFE#TRPBF reliable?
The price and inventory of LTC3862EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862EFE#TRPBF?
LTC3862EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862EFE#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 LTC3862EFE#TRPBF?
For technical support, including LTC3862EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862EFE#TRPBF requirements.
6.How does Aetrix verify that LTC3862EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862EFE#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 LTC3862EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862EFE#TRPBF?
All LTC3862EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862EFE#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 LTC3862EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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