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Analog Devices Inc. LTC3862HGN#PBF
- Part No.:
- LTC3862HGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3862HGN#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:110
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Product details
Overview
LTC3862HGN#PBF 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 programmable switching frequency, and features internal 5V/3.8V LDOs for gate drive and analog circuitry. It is used in high-efficiency automotive power supplies generating stable 48V outputs from 12V or 24V battery rails.
For engineers reviewing the LTC3862HGN#PBF datasheet, LTC3862HGN#PBF pinout, LTC3862HGN#PBF application, or LTC3862HGN#PBF equivalent, key selection criteria include its H-grade (–40°C to 150°C) thermal rating, 24-lead narrow SSOP package, dual-channel phase control via PHASEMODE/SYNC/CLKOUT, and precision ±1% reference with programmable leading edge blanking and slope compensation.
Technical Context
The LTC3862HGN#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 error amplifier output (ITH) directly sets current comparator trip thresholds, while internal 5V (INTVCC) and 3.8V (3V8) LDOs independently power gate drivers and low-voltage analog/digital circuitry.
Phase synchronization is achieved via PLL-based SYNC input (50kHz–650kHz), CLKOUT daisy-chaining, and PHASEMODE pin programming for 2-, 3-, 4-, 6-, or 12-phase operation. DMAX, SLOPE, and BLANK pins enable precise tuning of maximum duty cycle (75–96%), slope compensation gain (0.625–1.66×), and minimum on-time (180–340ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports wide automotive battery input including cold-crank (4.5V) and load-dump (36V) conditions. |
| Max Duty Cycle | Up to 96% - enables high step-up ratios (e.g., 12V→48V) without requiring excessive turns ratio or inductor size. |
| Switching Frequency | 75kHz to 500kHz (programmable) - balances efficiency, EMI, and magnetics size; synchronizable to external clock up to 650kHz. |
| Reference Voltage | ±1% accuracy (1.223V typ) - ensures tight output voltage regulation across temperature and line/load variations. |
| Operating Temp | –40°C to +150°C (H-grade) - qualified for under-hood automotive applications per AEC-Q100. |
| Gate Drive | 5V logic-level output (RDS(ON) = 2.1Ω pull-up / 0.7Ω pull-down) - directly drives low-QG logic-level MOSFETs without external level shifters. |
| Current Sense Threshold | 60mV to 90mV (adjustable via ITH) - provides accurate peak current limiting with <10mV channel-to-channel matching. |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN24), 0.025" lead pitch, exposed pad not present (unlike QFN/TSSOP variants). Thermal resistance θJA = 85°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Duty cycle limit control | SGND = 96%, float = 84%, 3V8 = 75% - sets hard upper bound on conduction time for stability and MOSFET SOA protection. |
| PHASEMODE (Pin 4) | Interleaving configuration | SGND/float/3V8 selects 180°/180°/120° CH1–CH2 phase offset - enables optimal ripple cancellation or multi-phase scaling. |
| GATE1/GATE2 (Pins 16,18) | N-channel MOSFET drivers | 5V gate drive referenced to PGND - supports fast turn-on/off of logic-level FETs with integrated 0.7Ω pull-down for robust dead-time control. |
| SENSE1+/SENSE2+ (Pins 23,13) | Current sense inputs | Differential inputs to peak current comparators - referenced to respective SENSE– pins; matched threshold ≤ ±10mV ensures balanced channel current sharing. |
| SYNC (Pin 11) | PLL synchronization input | Accepts 50–650kHz external clock - aligns GATE1 rising edge to SYNC rising edge for deterministic timing in multi-controller systems. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved architecture | Reduces input/output capacitor RMS current by ~30% and cuts peak-to-peak ripple amplitude by >50% vs single-phase designs. |
| Programmable slope compensation | SLOPE pin adjusts gain (0.625× to 1.66×) to stabilize current mode control at duty cycles >50% without external components. |
| Internal cascaded LDOs | 5V INTVCC powers gate drivers; 3.8V 3V8 powers analog/digital core - eliminates need for external bias rails and improves PSRR. |
| Precision RUN pin with hysteresis | 1.22V enable threshold with 80mV hysteresis - prevents oscillation during brown-out and enables clean system-level power sequencing. |
| AEC-Q100 qualified H-grade | Rated for –40°C to +150°C junction temperature - validated for automotive powertrain and ADAS subsystems requiring long-term reliability. |
Applications
| Automotive 48V Mild Hybrid Systems | Industrial Telecom Power Supplies |
|---|---|
Use Scenario: Generating regulated 48V bus from 12V vehicle battery to power e-turbo, active suspension, or 48V LED lighting. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel power stages with synchronized gate drive and shared feedback loop. Use Value: Interleaving cuts input capacitor size by 40% and reduces EMI filtering requirements versus single-phase alternatives. | Use Scenario: High-reliability 48V intermediate bus supply in telecom rectifiers or base station power shelves. IC Role / Device Role / Timing Role: Primary controller for non-isolated boost converter delivering up to 5A at 48V with tight line/load regulation. Use Value: ±1% reference and programmable soft-start ensure stable startup under varying AC-DC front-end conditions. |
| High-Voltage PoE++ Power Sourcing Equipment | Test & Measurement DC Power Modules |
Use Scenario: Boosting 24V/36V industrial DC input to IEEE 802.3bt-compliant 57V PoE++ PSE voltage range. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller with adjustable max duty cycle and overvoltage lockout on FB pin. Use Value: 96% max duty cycle enables efficient 24V→57V conversion without transformer-based topologies. | Use Scenario: Programmable bench power supply channel delivering 0–60V at 3–5A with digital setpoint interface. IC Role / Device Role / Timing Role: Core analog controller providing precision voltage/current regulation via ITH and FB loop with external DAC feedback. Use Value: Adjustable leading edge blanking and slope compensation allow stable operation across wide output voltage and load ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862HUH#PBF | Same silicon, 5mm × 5mm QFN-24 package with exposed PGND pad; θJA = 44°C/W vs 85°C/W for SSOP. | Better thermal performance required in space-constrained, high-power-density layouts where PCB copper area for heat spreading is limited. | Select when junction temperature margin is critical and board layout allows QFN soldering; requires different footprint and reflow profile. |
| LTC3862HFE#PBF | Same silicon, 24-lead TSSOP package; θJA = 38°C/W; exposed PGND pad; higher pin pitch (0.65mm) than SSOP (0.025"). | Preferred for manual assembly or legacy TSSOP-compatible production lines; offers better thermal dissipation than SSOP but less than QFN. | Select when balancing thermal needs with assembly process compatibility and existing TSSOP tooling. |
Compared with LTC3862HGN#PBF, the QFN variant offers superior thermal performance for high-current applications, while the TSSOP variant provides easier handling and better manufacturability-both retain identical electrical functionality and H-grade temperature rating.
Availability
LTC3862HGN#PBF is available at Aetrix Electronics and suitable for automotive 48V systems, industrial telecom power supplies, and high-voltage PoE++ PSE equipment requiring stable component supply with extended temperature capability.
Supply support for LTC3862HGN#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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies.
The LTC3862 product line delivers high-efficiency, multi-phase DC/DC controllers optimized for automotive, industrial, and telecom applications demanding wide input range, precise regulation, and robust thermal operation.
FAQ
What is the maximum allowable junction temperature for the LTC3862HGN#PBF?
The LTC3862HGN#PBF is rated for operation up to +150°C junction temperature (H-grade). Its absolute maximum rating is 150°C, and thermal shutdown activates above this threshold. For reliable long-term operation, design should maintain TJ ≤ 140°C using θJA = 85°C/W and appropriate PCB copper area. The LTC3862HGN#PBF datasheet specifies derating above 125°C to preserve lifetime.
How does the PHASEMODE pin affect channel timing in the LTC3862HGN#PBF?
The PHASEMODE pin on the LTC3862HGN#PBF configures the phase relationship between CH1 and CH2 gate signals: SGND or floating sets 180° offset, while 3V8 sets 120° offset. This directly determines ripple cancellation effectiveness and current sharing in multi-phase configurations. The LTC3862HGN#PBF also uses PHASEMODE to define CH1-to-CLKOUT phase alignment (90°, 60°, or 240°), enabling precise daisy-chained synchronization.
Can the LTC3862HGN#PBF be used in SEPIC topology, and what design considerations apply?
Yes, the LTC3862HGN#PBF supports SEPIC operation per its datasheet description and typical application circuits. Key considerations include using coupled inductors or separate L1/L2 with proper polarity, ensuring the SENSE+ and SENSE– connections monitor switch-node current, and verifying stability with slope compensation adjusted via the SLOPE pin. The LTC3862HGN#PBF's current-mode architecture and programmable blanking make it well-suited for SEPIC's discontinuous conduction modes.
What is the purpose of the 3V8 pin on the LTC3862HGN#PBF, and how must it be decoupled?
The 3V8 pin on the LTC3862HGN#PBF is the output of an internal LDO powered from INTVCC, supplying 3.8V to low-voltage analog and digital circuitry. It must be decoupled with a 1nF X5R ceramic capacitor placed directly between 3V8 and SGND, as close as possible to the IC. This capacitor stabilizes the reference and error amplifier rails; omitting it risks noise-induced regulation errors or instability in the LTC3862HGN#PBF control loop.
Does the LTC3862HGN#PBF support pulse-skipping mode, and how is it enabled?
Yes, the LTC3862HGN#PBF supports pulse-skipping mode at light loads. It activates automatically when the ITH pin voltage falls below 0.275V (with 25mV hysteresis), reducing switching frequency to maintain regulation while minimizing quiescent current. No external enable signal is required-the LTC3862HGN#PBF enters and exits this mode seamlessly based on load demand and internal error amplifier output.
LTC3862HGN#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):
- 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-SSOP
LTC3862HGN#PBF FAQ
1.How can I place an order for LTC3862HGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862HGN#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 LTC3862HGN#PBF reliable?
The price and inventory of LTC3862HGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862HGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862HGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862HGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862HGN#PBF?
LTC3862HGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862HGN#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 LTC3862HGN#PBF?
For technical support, including LTC3862HGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862HGN#PBF requirements.
6.How does Aetrix verify that LTC3862HGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862HGN#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 LTC3862HGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862HGN#PBF?
All LTC3862HGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862HGN#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 LTC3862HGN#PBF part is unused and in its original packaging.
Return procedure for LTC3862HGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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