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Analog Devices Inc. LTC3862HFE#PBF
- Part No.:
- LTC3862HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3862HFE#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:188
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Product details
Overview
LTC3862HFE#PBF 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 features internal 5V/3.8V LDOs for gate drive and analog circuitry. It enables high-efficiency 48V telecom power supplies with reduced input/output filtering.
For engineers reviewing the LTC3862HFE#PBF datasheet, LTC3862HFE#PBF pinout, LTC3862HFE#PBF application, or LTC3862HFE#PBF equivalent, key selection considerations include its –40°C to 150°C automotive-grade junction temperature rating, phase-lockable multi-phase synchronization (2-/3-/4-/6-/12-phase), programmable leading edge blanking, and precise ±1% reference voltage for stable output regulation.
Technical Context
The LTC3862HFE#PBF implements fixed-frequency peak current mode control across two interleaved channels operating 180° out of phase, reducing input/output ripple and filter component stress. Its dual cascaded LDO architecture supplies 5V (INTVCC) to gate drivers and 3.8V (3V8) to analog/digital circuitry - both internally regulated and thermally isolated.
Phase relationship is programmable via PHASEMODE (0V/float/3.8V), enabling 120°, 180°, or 180° CH1–CH2 alignment; CLKOUT and SYNC support daisy-chained multi-phase systems up to 12 phases. Internal slope compensation gain (SLOPE pin) and adjustable maximum duty cycle (DMAX pin) allow optimization for stability and wide VIN–VOUT ratios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide-input industrial and automotive battery-fed boost applications without external pre-regulation. |
| Switching Frequency | 75kHz to 500kHz (adjustable via FREQ resistor) - enables optimized trade-off between efficiency, size, and EMI in high-power boost converters. |
| Max Duty Cycle | Up to 96% (DMAX = SGND) - allows high step-up ratios (e.g., 12V→48V) while maintaining controllable minimum on-time. |
| Reference Voltage | ±1% accuracy (1.223V typ) - ensures tight output voltage regulation across temperature and load in feedback-controlled systems. |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade H, suitable for under-hood automotive and high-ambient industrial environments. |
| Gate Drive Voltage | 5V (INTVCC) - directly drives logic-level N-channel MOSFETs without level-shifting, simplifying high-side switch design. |
| Current Sense Threshold | 60mV to 90mV (adjustable via ITH) - provides accurate peak current limiting with <±10mV channel-to-channel matching for balanced phase current sharing. |
Pinout & Package
Package: 24-lead plastic TSSOP (FE package), 0.65mm lead pitch, exposed PGND pad (Pin 25) requiring soldering to PCB for thermal and electrical performance. θJA = 38°C/W.
| 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 to prevent instability or transformer saturation in high-ratio boost. |
| GATE1 / GATE2 (Pins 18/16) | N-channel MOSFET gate drivers | 5V outputs referenced to PGND - drive logic-level FETs directly; each rated for –0.3V to 6V absolute max voltage. |
| SENSE1+/SENSE1– / SENSE2+/SENSE2– (Pins 23/22, 13/14) | Current sense differential inputs | Measure source-side sense resistor voltage; trip threshold set by ITH voltage - enables precise per-phase current limiting and sharing. |
| PHASEMODE (Pin 4) | Interleaving phase configuration | Selects CH1–CH2 phase offset: 0V = 180°, float = 180°, 3V8 = 120° - determines ripple cancellation effectiveness and system-level thermal distribution. |
| CLKOUT (Pin 10) | Multi-phase synchronization output | Provides phase-aligned clock signal for daisy-chaining additional LTC3862 controllers - essential for scalable 3-, 4-, 6-, or 12-phase designs. |
| SYNC (Pin 11) | External clock synchronization input | Accepts 50kHz–650kHz external clock - enables EMI reduction via frequency alignment and deterministic timing across multiple converters. |
| INTVCC (Pin 19) | 5V gate driver LDO output | Supplies gate drivers and high-current circuitry; requires ≥4.7µF ceramic bypass to PGND - UVLO at 3.3V rising prevents weak gate drive during startup. |
| 3V8 (Pin 24) | 3.8V analog/digital LDO output | Powers error amplifier, comparators, and logic; requires 1nF ceramic bypass to SGND - electrically isolated from INTVCC and PGND for noise immunity. |
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, lowering component count and size. |
| Programmable leading edge blanking | Three settings (180ns/260ns/340ns via BLANK pin) suppress false current-sense triggering during MOSFET turn-on, improving light-load stability. |
| Adjustable slope compensation gain | SLOPE pin (SGND/float/3V8) scales internal ramp by 0.625×/1.0×/1.66× - prevents subharmonic oscillation in continuous conduction mode boost/SEPIC. |
| Precision RUN pin with hysteresis | 1.22V enable threshold with 80mV hysteresis (via internal 4.5µA pull-up) - ensures clean, bounce-free startup/shutdown in noisy automotive environments. |
| Internal 5V/3.8V dual-LDO architecture | Eliminates need for external bias rails; INTVCC powers gate drivers (up to 50mA), 3V8 powers analog core - improves layout simplicity and PSRR. |
Applications
| Telecom 48V Intermediate Bus | Automotive ADAS Power Supply |
|---|---|
Use Scenario: Generating stable 48V from 12V vehicle battery for radar, camera, and domain controller modules. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved power stages with synchronized CLKOUT/SYNC for EMI compliance. Use Value: Achieves >94% efficiency at 5A output while meeting AEC-Q100 H-grade thermal requirements and minimizing input capacitor size. |
Use Scenario: Powering high-current infotainment SoCs requiring tightly regulated 12V/5V rails derived from 48V mild-hybrid bus. IC Role / Device Role / Timing Role: SEPIC controller operating in buck-boost mode across wide input transients (4V–36V), with programmable DMAX for fault containment. Use Value: Maintains regulation during cold-crank (4.5V) and load-dump (36V) events without external protection circuitry. |
| Industrial PoE++ Midspan | Medical Imaging LED Driver Bias |
Use Scenario: Providing [email protected] per port in IEEE 802.3bt Type 4 midspan injectors with strict thermal limits. IC Role / Device Role / Timing Role: Dual-channel boost controller with matched current sensing (±10mV) ensuring equal current sharing across parallel ports. Use Value: Enables compact, fanless design via 150°C-rated junction and low RθJA (38°C/W) TSSOP package. |
Use Scenario: Driving high-brightness surgical lighting arrays requiring ultra-stable 36V–60V bias with minimal output ripple. IC Role / Device Role / Timing Role: Precision current-mode controller using FB/ITH loop with ±1% reference and programmable soft-start (SS pin). Use Value: Delivers <10mVpp output ripple and <0.1% load regulation - critical for flicker-free illumination in real-time imaging. |
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#PBF | Same architecture and pinout; rated for –40°C to +125°C (I-grade) instead of +150°C (H-grade). | Not qualified for under-hood automotive use; suitable for industrial control cabinets or telecom equipment with lower ambient limits. | Select when full AEC-Q100 H-grade thermal margin is unnecessary and cost optimization is prioritized. |
| LTC3862HUH#PBF | Identical electrical specs and temperature rating, but in 5mm × 5mm QFN (UH) package with θJA = 44°C/W and exposed thermal pad. | Better thermal performance in space-constrained layouts; requires different PCB footprint and reflow profile vs TSSOP. | Choose for higher power density designs where thermal resistance must be minimized and board area is limited. |
Compared with LTC3862IFE#PBF, the LTC3862HFE#PBF adds 25°C higher junction temperature capability for harsh environments; compared with LTC3862HUH#PBF, it trades slightly higher thermal resistance for easier assembly and legacy TSSOP compatibility.
Availability
LTC3862HFE#PBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, telecom 48V intermediate bus generation, and industrial PoE++ midspan injectors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3862HFE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3862 product line delivers high-efficiency, multi-phase DC/DC controllers for demanding boost, SEPIC, and flyback topologies - engineered specifically for automotive, telecom, and industrial power systems requiring robust thermal performance and precise regulation.
FAQ
What is the maximum operating junction temperature for the LTC3862HFE#PBF?
The LTC3862HFE#PBF is rated for a maximum junction temperature of +150°C and is AEC-Q100 qualified for automotive Grade H applications. This specification is guaranteed over the full –40°C to +150°C operating junction temperature range, with thermal derating applied above 125°C to ensure long-term reliability. The FE package has θJA = 38°C/W.
How does the PHASEMODE pin affect channel timing in the LTC3862HFE#PBF?
The PHASEMODE pin on the LTC3862HFE#PBF selects the phase relationship between Channel 1 and Channel 2: 0V yields 180°, floating yields 180°, and 3.8V yields 120°. It also defines CH1-to-CLKOUT phase alignment (90°/60°/240° respectively). This enables flexible ripple cancellation and thermal distribution in multi-phase systems without external timing components.
Can the LTC3862HFE#PBF synchronize to an external clock, and what is its supported frequency range?
Yes, the LTC3862HFE#PBF supports external clock synchronization via the SYNC pin, accepting input frequencies from 50kHz to 650kHz. The internal PLL locks to the external signal, aligning GATE1's rising edge with the SYNC rising edge. This capability enables deterministic EMI reduction and coordinated operation across multiple converters in dense power systems.
What is the purpose of the DMAX pin on the LTC3862HFE#PBF, and how is it configured?
The DMAX pin on the LTC3862HFE#PBF programs the maximum duty cycle: connecting to SGND sets 96%, leaving it floating sets 84%, and connecting to 3.8V sets 75%. This limit is derived from a 12× internal clock and provides precise, temperature-stable control to prevent instability or magnetic core saturation in high-ratio boost applications.
Does the LTC3862HFE#PBF integrate voltage regulation for its internal circuitry?
Yes, the LTC3862HFE#PBF integrates two independent LDO regulators: a 5V INTVCC LDO powered from VIN for gate drivers (with 3.3V UVLO), and a 3.8V 3V8 LDO powered from INTVCC for analog/digital control circuitry. Both require dedicated ceramic bypass capacitors (4.7µF for INTVCC to PGND; 1nF for 3V8 to SGND) placed near their respective pins.
LTC3862HFE#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):
- 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#PBF FAQ
1.How can I place an order for LTC3862HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862HFE#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 LTC3862HFE#PBF reliable?
The price and inventory of LTC3862HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862HFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862HFE#PBF?
LTC3862HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862HFE#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 LTC3862HFE#PBF?
For technical support, including LTC3862HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862HFE#PBF requirements.
6.How does Aetrix verify that LTC3862HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862HFE#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 LTC3862HFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862HFE#PBF?
All LTC3862HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862HFE#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 LTC3862HFE#PBF part is unused and in its original packaging.
Return procedure for LTC3862HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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