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Analog Devices Inc. LTC3862IFE#TRPBF
- Part No.:
- LTC3862IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3862IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,588
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Product details
Overview
LTC3862IFE#TRPBF from Analog Devices is a two-phase, constant-frequency, peak current mode boost and 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 in automotive and industrial applications.
For engineers reviewing the LTC3862IFE#TRPBF datasheet, LTC3862IFE#TRPBF pinout, LTC3862IFE#TRPBF application, or LTC3862IFE#TRPBF equivalent, key selection considerations include its 2-phase interleaved operation for reduced input/output ripple, programmable phase relationships (180°/120°), AEC-Q100 qualification for automotive use, and precise ±1% reference voltage for stable output regulation.
Technical Context
The LTC3862IFE#TRPBF implements fixed-frequency peak current mode control with dual independent channels operating 180° out of phase. Its error amplifier compares FB voltage against a 1.223V internal reference and drives ITH to modulate peak inductor current. Slope compensation gain is adjustable via SLOPE pin, and leading edge blanking is configurable via BLANK pin (180ns/260ns/340ns).
Multi-phase synchronization uses SYNC input, CLKOUT output, and PHASEMODE pin to support 2-, 3-, 4-, 6-, or 12-phase configurations. The internal PLL locks to external clocks from 50kHz to 650kHz, and DMAX pin sets maximum duty cycle (75%/84%/96%) with 12× internal clock precision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports wide-input industrial and automotive battery systems without pre-regulation |
| Switching Frequency | 75kHz to 500kHz - set by single external resistor; enables optimized magnetics size vs EMI trade-off |
| Max Duty Cycle | Up to 96% - allows high step-up ratios (e.g., 12V→48V) with minimal conduction loss |
| Reference Voltage | ±1% (1.223V typ) - ensures tight output voltage regulation across temperature and load |
| Gate Drive | 5V output referenced to PGND - directly drives logic-level N-channel MOSFETs without level shifters |
| Thermal Rating | –40°C to +125°C junction - qualified for under-hood automotive and harsh industrial environments |
| Package | 24-lead TSSOP (FE) - thermally enhanced with exposed PGND pad (θJA = 38°C/W) |
Pinout & Package
Package: 24-lead narrow-body TSSOP (FE), 0.65mm lead pitch, exposed thermal pad (Pin 25) connected to PGND and required to be soldered to PCB ground plane.
| 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 for stability and MOSFET SOA protection |
| PHASEMODE (Pin 4) | Interleaved phase configuration | SGND/float/3V8 selects CH1–CH2 phase offset (180°/180°/120°) and CH1–CLKOUT relationship (90°/60°/240°) |
| GATE1/GATE2 (Pins 18/16) | N-channel MOSFET gate drivers | 5V push-pull outputs with 2.1Ω pull-up / 0.7Ω pull-down - drive QG ≤ 50nC logic-level FETs directly |
| SENSE1+/SENSE2+ (Pins 23/13) | Current sense positive inputs | Differential inputs to current comparators - interface with low-side sense resistors (e.g., 6mΩ) for accurate peak current detection |
| INTVCC (Pin 19) | 5V gate driver LDO output | Supplies gate drivers; UVLO at 3.3V rising / 2.9V falling - prevents weak turn-on during brownout |
| 3V8 (Pin 24) | 3.8V analog/digital LDO output | Powers internal error amp, PWM logic, and reference - bypassed with 1nF ceramic for noise immunity |
| SYNC (Pin 11) | External clock synchronization input | Accepts 50–650kHz TTL/CMOS clock; rising edge aligns with GATE1 - enables deterministic multi-phase timing |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output capacitor RMS current by ~30% and cuts peak-to-peak ripple amplitude by >50% vs single-phase |
| Programmable slope compensation | SLOPE pin adjusts gain (0.625×/1.0×/1.66×) to stabilize current mode control across duty cycles and inductance variations |
| Adjustable minimum on-time | BLANK pin configures tON(MIN) (180ns/260ns/340ns) - enables reliable operation at high VIN/VOUT ratios and light loads |
| Precision RUN pin threshold | 1.22V enable with 80mV hysteresis - provides clean startup/shutdown sequencing and noise immunity in noisy environments |
| AEC-Q100 Grade I qualification | Rated for –40°C to +125°C operation with automotive reliability testing - suitable for ADAS, infotainment, and body electronics |
Applications
| Telecom Power Supply | Automotive ADAS Camera Module |
|---|---|
Use Scenario: Generating stable 48V rail from 12V vehicle battery for PoE++-compatible camera back-end processing. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved power stage timing and current sharing between dual boost converters. Use Value: Achieves >94% efficiency at 5A output while reducing input capacitance by 40% and meeting CISPR-25 Class 5 conducted EMI limits. | Use Scenario: Providing regulated 24V/3A supply for stereo vision ECU in autonomous driving systems. IC Role / Device Role / Timing Role: High-reliability boost controller with AEC-Q100 qualification, enabling robust start-stop operation and cold-crank immunity. Use Value: Maintains regulation down to 4.5V VIN during cranking; 125°C rating ensures uninterrupted operation near engine bay heat sources. |
| Industrial Motor Drive Auxiliary PSU | Medical Imaging Power Subsystem |
Use Scenario: Deriving isolated 24V/1A auxiliary supply from 48V DC bus for gate drivers and sensors in servo inverters. IC Role / Device Role / Timing Role: SEPIC-mode controller supporting non-inverting buck-boost topology to handle bidirectional bus transients. Use Value: Enables seamless operation during bus dips/surges without output dropout; programmable DMAX prevents overvoltage stress on downstream isolators. | Use Scenario: Generating low-noise ±15V rails for analog front-end amplifiers in portable ultrasound devices. IC Role / Device Role / Timing Role: Precision-controlled boost controller feeding post-regulation LDOs, with soft-start limiting inrush into sensitive analog circuitry. Use Value: ±1% reference and <10mV current sense threshold matching ensure <0.5% output voltage drift across temperature and load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862-1IFE#TRPBF | Higher INTVCC UVLO (7.5V rising), optimized for standard-threshold MOSFETs | Required when using 10V-gate MOSFETs instead of logic-level types | Select only if gate drive voltage >5V is needed; not drop-in compatible due to different UVLO thresholds |
| LTC3862-2IFE#TRPBF | Lower INTVCC UVLO (4.4V rising), supports wider VIN range with lower gate drive headroom | Better suited for ultra-low-VIN boost (e.g., 3.3V input) where 5V gate drive margin is constrained | Choose when operating below 5V input or requiring tighter UVLO hysteresis; incompatible with 12V+ VIN systems |
Compared with LTC3862IFE#TRPBF, the -1 variant enables standard MOSFETs but sacrifices low-VIN capability, while the -2 variant extends low-input operation at the cost of reduced gate drive safety margin-neither offers pin compatibility nor identical biasing behavior.
Availability
LTC3862IFE#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS modules, telecom 48V power systems, and industrial motor drive auxiliary supplies requiring stable component supply and long-term lifecycle support.
Supply support for LTC3862IFE#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 (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) designs high-performance analog, mixed-signal, and digital signal processing ICs for precision, power, and RF applications.
The LTC3862 product line delivers high-efficiency, multi-phase DC/DC controllers for demanding boost, SEPIC, and flyback topologies in automotive, telecom, and industrial power systems.
FAQ
What is the absolute maximum input voltage rating for the LTC3862IFE#TRPBF?
The LTC3862IFE#TRPBF has an absolute maximum VIN rating of 40V. Operation above this voltage risks permanent damage. The recommended operating range remains 4V to 36V per specifications. Exceeding 40V-even momentarily-violates Absolute Maximum Ratings and may degrade reliability or cause immediate failure. Always include transient voltage suppression on the VIN rail when used in automotive or industrial environments with potential load-dump events.
Does the LTC3862IFE#TRPBF support SEPIC topology, and what design considerations apply?
Yes, the LTC3862IFE#TRPBF supports SEPIC topology using both channels with appropriate external component layout. It requires two coupled inductors or separate inductors with cross-coupled capacitors, and careful attention to current sensing placement on the switch node side. The controller's dual independent current sense inputs (SENSE1+/–, SENSE2+/–) and programmable slope compensation allow stable SEPIC operation across wide duty cycles. Reference Design DC1922A demonstrates validated SEPIC implementation with LTC3862IFE#TRPBF.
How does the PHASEMODE pin affect timing relationships in multi-phase LTC3862IFE#TRPBF configurations?
The PHASEMODE pin on the LTC3862IFE#TRPBF directly controls both CH1–CH2 and CH1–CLKOUT phase offsets. At SGND or floating, it sets 180° channel separation and 90° CLKOUT delay; at 3V8, it configures 120° channel separation and 240° CLKOUT delay. This enables deterministic interleaving for 2-, 3-, 4-, 6-, or 12-phase systems when cascading multiple LTC3862IFE#TRPBF units via SYNC/CLKOUT. Phase alignment is maintained across temperature and supply variation due to internal PLL locking.
Can the LTC3862IFE#TRPBF drive high gate charge MOSFETs, and what is the recommended INTVCC bypass capacitance?
The LTC3862IFE#TRPBF gate drivers support MOSFETs with total gate charge (QG) up to 50nC at 5V. For higher QG devices, increase the INTVCC bypass capacitance to ≥10µF (X5R/X7R ceramic) placed adjacent to Pin 19 and PGND. This maintains stable 5V gate drive under high-frequency switching and prevents INTVCC droop that could cause incomplete MOSFET turn-on. The internal 50mA LDO current limit and thermal derating must also be verified for continuous high-QG operation.
Is the LTC3862IFE#TRPBF pin-compatible with other variants like LTC3862-1 or LTC3862-2?
No, the LTC3862IFE#TRPBF is not pin-compatible with LTC3862-1IFE#TRPBF or LTC3862-2IFE#TRPBF. Although all share identical pinouts and packages, their INTVCC UVLO thresholds differ significantly (3.3V vs 7.5V vs 4.4V rising), altering startup behavior and system-level biasing. Interchanging them without circuit redesign risks failure to start, unintended shutdown, or overvoltage stress on gate drivers. Each variant requires dedicated feedback and enable network tuning.
LTC3862IFE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
LTC3862IFE#TRPBF FAQ
1.How can I place an order for LTC3862IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862IFE#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 LTC3862IFE#TRPBF reliable?
The price and inventory of LTC3862IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862IFE#TRPBF?
LTC3862IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862IFE#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 LTC3862IFE#TRPBF?
For technical support, including LTC3862IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3862IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862IFE#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 LTC3862IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862IFE#TRPBF?
All LTC3862IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862IFE#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 LTC3862IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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