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Analog Devices Inc. LTC3862HFE#TRPBF
- Part No.:
- LTC3862HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3862HFE#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,218
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Product details
Overview
LTC3862HFE#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 features internal 5V/3.8V LDOs for gate drive and analog circuitry. It is used in high-reliability automotive power supplies requiring stable 48V output from wide-input sources.
For engineers reviewing the LTC3862HFE#TRPBF datasheet, LTC3862HFE#TRPBF pinout, LTC3862HFE#TRPBF application, or LTC3862HFE#TRPBF equivalent, key selection criteria include phase synchronization capability (SYNC/CLKOUT), programmable DMAX and BLANK timing, ±1% reference accuracy, thermal grade (–40°C to 150°C), and TSSOP-24 package compatibility with AEC-Q100 automotive qualification.
Technical Context
The LTC3862HFE#TRPBF implements a dual-channel, interleaved peak current mode control architecture with 180° phase shift between channels, reducing input/output ripple and filter component stress. Its internal PLL enables synchronization across 2-, 3-, 4-, 6-, or 12-phase systems via SYNC input and CLKOUT output, while PHASEMODE pin selects channel-to-channel and channel-to-clock phase relationships (120°/180°/240°).
It integrates two cascaded PMOS LDOs: a 5V INTVCC regulator (3.3V UVLO rising, 50mA RMS output) for gate drivers and a 3.8V 3V8 regulator (bypassed with 1nF ceramic to SGND) for analog/digital control circuits. Slope compensation gain is adjustable via SLOPE pin, and leading edge blanking is configurable via BLANK pin (180ns/260ns/340ns min on-time).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports automotive battery transients and industrial wide-input rails without external pre-regulation. |
| Switching Frequency | 75kHz to 500kHz - set by single resistor on FREQ pin; enables optimization of efficiency vs. size trade-offs in boost/SEPIC designs. |
| Max Duty Cycle | Up to 96% - configured via DMAX pin (SGND = 96%, float = 84%, 3V8 = 75%), critical for high-step-up ratio applications like 12V-to-48V conversion. |
| Reference Accuracy | ±1% over temperature - ensures precise output voltage regulation (e.g., 48V ±0.48V) in closed-loop feedback using FB resistive divider. |
| Operating Temp Range | –40°C to +150°C - H-grade qualification enables under-hood automotive use with guaranteed performance at full junction temperature. |
| Gate Drive Voltage | 5V (INTVCC) - optimized for logic-level N-channel MOSFETs, eliminating need for external level-shifting or bootstrap circuits. |
| Current Sense Threshold | 60mV to 90mV (typical 75mV) - low threshold reduces sense resistor power loss and improves light-load efficiency in high-current boost stages. |
Pinout & Package
Package: 24-lead narrow-body TSSOP (FE package), thermally enhanced with exposed PGND pad (Pin 25), θJA = 38°C/W, RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Duty cycle limit control | Connect to SGND for 96% max duty cycle - essential for high-ratio boost converters where extended on-time is required. |
| GATE1/GATE2 (Pins 18/16) | N-channel MOSFET gate drivers | 5V outputs referenced to PGND - directly drive logic-level MOSFETs without external drivers or level shifters. |
| SENSE1+/SENSE2+ (Pins 23/13) | Current sense positive inputs | Accept low-side sense resistor signals - enable accurate per-phase current limiting and interleaved current balancing. |
| CLKOUT (Pin 10) | Phase-synchronization output | Provides daisy-chain clock signal for multi-phase expansion - allows precise timing alignment across multiple LTC3862HFE#TRPBF controllers. |
| PHASEMODE (Pin 4) | Interleaving configuration | Selects CH1–CH2 phase offset (120°/180°/240°) - determines ripple cancellation effectiveness and system EMI profile. |
| PGND (Pin 17 + Exposed Pad 25) | Power ground return | Must be soldered to PCB ground plane - provides low-inductance path for high di/dt MOSFET switching currents and thermal conduction. |
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% versus single-phase design. |
| Internal 5V/3.8V dual LDOs | Eliminates need for external bias supplies - INTVCC powers gate drivers; 3V8 powers error amplifier, comparators, and PLL circuitry. |
| Programmable leading edge blanking | Configurable min on-time (180ns/260ns/340ns) via BLANK pin - prevents false current-sense triggering during MOSFET turn-on transitions. |
| AEC-Q100 qualified (H-grade) | Validated for automotive under-hood environments - includes HTOL, TC, UHAST, and ESD testing per Grade 0 requirements. |
| Slope compensation gain adjustment | Normalized gain selectable as 0.625×/1.0×/1.66× via SLOPE pin - stabilizes current mode control across varying duty cycles and inductor values. |
Applications
| Automotive 48V Mild Hybrid Systems | Industrial Telecom Power Supplies |
|---|---|
Use Scenario: Generating regulated 48V bus from 12V vehicle battery to power ADAS cameras, radar modules, and infotainment subsystems. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved power stage timing and current sharing between parallel MOSFETs. Use Value: Achieves >94% efficiency at 5A load with reduced EMI and smaller output capacitors due to 180° phase shift and 96% duty cycle support. | Use Scenario: Providing isolated 48V intermediate bus in telecom rectifiers and distributed power architectures with wide input range (9–36V). IC Role / Device Role / Timing Role: Constant-frequency current-mode controller synchronizing to system clock via SYNC pin for deterministic noise spectrum management. Use Value: Enables compliance with EN55022 Class B conducted emissions limits through controlled switching edge rates and phase-aligned ripple cancellation. |
| High-Density LED Backlight Drivers | Test Equipment DC Power Modules |
Use Scenario: Driving high-brightness LED strings in medical imaging displays requiring stable 40–60V output with tight regulation. IC Role / Device Role / Timing Role: SEPIC topology controller delivering non-inverting step-up with inherent input-output isolation and soft-start-controlled current ramp. Use Value: ±1% reference and programmable hysteresis on RUN pin ensure repeatable startup behavior and consistent LED brightness across temperature. | Use Scenario: Programmable bench power supply output stage supporting 0–60V, 0–10A operation with fast transient response and remote sensing. IC Role / Device Role / Timing Role: Precision current-mode controller implementing digital DAC-set ITH voltage for accurate current limiting and CC/CV transition control. Use Value: Adjustable slope compensation and leading edge blanking allow stable operation with diverse inductor selections and high-bandwidth current loop closure. |
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 | Same architecture and pinout; rated for –40°C to +125°C (I-grade) instead of –40°C to +150°C (H-grade). | Not qualified for under-hood automotive use; suitable for industrial or telecom enclosures with lower ambient temperature limits. | Select when thermal derating above 125°C is not required and cost sensitivity favors I-grade pricing. |
| LTC3862HUH#TRPBF | Identical electrical specs and H-grade rating; uses 5mm × 5mm QFN-24 package (UH) instead of TSSOP-24 (FE), with θJA = 44°C/W vs. 38°C/W. | Better thermal performance in space-constrained layouts; requires different PCB footprint and reflow profile than TSSOP. | Select when board area is limited and thermal margin must be maximized despite higher assembly complexity. |
Compared with LTC3862IFE#TRPBF and LTC3862HUH#TRPBF, the LTC3862HFE#TRPBF uniquely combines AEC-Q100 H-grade reliability in the mature, wave-solder-compatible TSSOP package - making it optimal for automotive production programs requiring long-term supply stability and legacy process compatibility.
Availability
LTC3862HFE#TRPBF is available at Aetrix Electronics and suitable for automotive power conversion, industrial telecom infrastructure, and high-reliability test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC3862HFE#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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive systems.
The LTC3862 product line delivers multi-phase, current-mode DC/DC controllers optimized for high-efficiency, high-reliability boost and SEPIC topologies in automotive, telecom, and industrial power applications - with emphasis on thermal robustness, synchronization flexibility, and integrated bias regulation.
FAQ
What is the maximum operating junction temperature for the LTC3862HFE#TRPBF?
The LTC3862HFE#TRPBF is specified for an operating junction temperature range of –40°C to +150°C and is fully guaranteed across this range. Its thermal resistance (θJA) is 38°C/W in the TSSOP-24 package. To maintain reliability, the actual junction temperature should be calculated using TJ = TA + PDISS × θJA, where PDISS includes quiescent and gate charge losses. The device includes overtemperature protection that disables switching if TJ exceeds 150°C.
Does the LTC3862HFE#TRPBF support synchronization with external clock sources?
Yes, the LTC3862HFE#TRPBF supports external clock synchronization via its SYNC pin, accepting input frequencies from 50kHz to 650kHz. When synchronized, the internal PLL aligns the rising edge of GATE1 with the rising edge of the SYNC signal. This capability enables deterministic EMI reduction and coordinated multi-phase operation across multiple LTC3862HFE#TRPBF controllers in systems requiring precise timing alignment.
How is the maximum duty cycle configured on the LTC3862HFE#TRPBF?
The maximum duty cycle of the LTC3862HFE#TRPBF is configured using the DMAX pin (Pin 1): connecting it to SGND sets 96%, leaving it floating sets 84%, and connecting it to 3V8 sets 75%. This setting is derived from an internal 12× oscillator and provides precise, temperature-stable duty cycle limiting - critical for preventing transformer saturation or MOSFET overstress in high-step-up boost converters.
What is the purpose of the 3V8 pin on the LTC3862HFE#TRPBF?
The 3V8 pin on the LTC3862HFE#TRPBF is the output of an internal LDO powered from INTVCC, providing a regulated 3.8V supply for low-voltage analog and digital control circuitry (error amplifier, comparators, PLL, logic). It must be bypassed with a 1nF ceramic capacitor to SGND, placed adjacent to the IC. This rail is not intended for external loads and isolates sensitive analog functions from gate-drive noise on INTVCC.
Can the LTC3862HFE#TRPBF be used in SEPIC topology applications?
Yes, the LTC3862HFE#TRPBF is explicitly designed for both boost and SEPIC topologies. Its dual N-channel gate drivers, independent current sense inputs (SENSE1+/– and SENSE2+/–), and ability to operate with input voltages near or above the desired output make it suitable for non-inverting SEPIC configurations. Application Note AN158 demonstrates a 12V-to-48V SEPIC design using the LTC3862HFE#TRPBF with 92% efficiency at full load.
LTC3862HFE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
LTC3862HFE#TRPBF FAQ
1.How can I place an order for LTC3862HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862HFE#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 LTC3862HFE#TRPBF reliable?
The price and inventory of LTC3862HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862HFE#TRPBF?
LTC3862HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862HFE#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 LTC3862HFE#TRPBF?
For technical support, including LTC3862HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862HFE#TRPBF requirements.
6.How does Aetrix verify that LTC3862HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862HFE#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 LTC3862HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862HFE#TRPBF?
All LTC3862HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862HFE#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 LTC3862HFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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