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Analog Devices Inc. LTC3862HUH#PBF
- Part No.:
- LTC3862HUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WQFN Exposed Pad
- Datasheet:
-
LTC3862HUH#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:127
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Product details
Overview
LTC3862HUH#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 targets high-efficiency automotive and industrial boost power supplies delivering stable 48V outputs.
For engineers reviewing the LTC3862HUH#PBF datasheet, LTC3862HUH#PBF pinout, LTC3862HUH#PBF application, or LTC3862HUH#PBF equivalent, key selection criteria include phase synchronization capability (SYNC/CLKOUT/PHASEMODE), programmable leading-edge blanking (BLANK), slope compensation gain control (SLOPE), multi-phase scalability (2-/3-/4-/6-/12-phase), and AEC-Q100 qualification for under-hood automotive use.
Technical Context
The LTC3862HUH#PBF implements a fixed-frequency, two-phase interleaved peak current mode architecture with 180° channel phase shift, reducing input/output ripple and filter component stress. Its dual-channel design uses independent current sense paths (SENSE1±/SENSE2±) with ±10mV matching and programmable ITH-based trip threshold control.
It integrates 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) for analog/digital circuitry. Phase-lock loop (PLL) synchronization via SYNC input (50–650kHz range) and CLKOUT daisy-chaining enables precise multi-phase coordination without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports wide-input automotive battery systems (cold-crank to load-dump conditions). |
| Max Duty Cycle | Up to 96% - enables high step-up ratios (e.g., 12V→48V) with minimal conduction loss. |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable) - balances efficiency vs. size for inductors/capacitors. |
| Current Sense Threshold | 65mV to 90mV (adjustable via ITH) - sets precise peak inductor current limit with ±10mV CH1/CH2 matching. |
| Reference Voltage | ±1% accuracy at 1.223V - ensures tight output voltage regulation (e.g., 48V ±0.48V) across temperature. |
| Operating Temp | –40°C to +150°C junction - qualified per AEC-Q100 Grade H for under-hood automotive deployment. |
| Package | 24-lead 5mm × 5mm QFN (UH) - thermally enhanced (θJA = 44°C/W) with exposed PGND pad for PCB heat sinking. |
Pinout & Package
Package: 24-lead (5mm × 5mm) plastic QFN with 0.65mm lead pitch and exposed thermal pad (Pin 25 = PGND). Requires soldering of exposed pad to PCB ground for rated thermal performance (θJA = 44°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Maximum Duty Cycle Control | SGND = 96%, float = 84%, 3V8 = 75% - sets hard upper limit on on-time to prevent transformer saturation or overvoltage. |
| PHASEMODE (Pin 4) | Interleaved Phase Programming | SGND/float/3V8 selects 180°/180°/120° CH1–CH2 relationship and 90°/60°/240° CH1–CLKOUT alignment for multi-phase stacking. |
| GATE1/GATE2 (Pins 18/16) | N-Channel MOSFET Gate Drivers | 5V logic-level drive referenced to PGND - directly interfaces with low-threshold MOSFETs (e.g., Renesas HAT2266) without level-shifting. |
| SENSE1+/SENSE2+ (Pins 23/13) | Current Sense Inputs | Differential inputs for shunt-resistor-based current sensing - enable cycle-by-cycle peak current limiting per phase. |
| CLKOUT (Pin 10) | Multi-Phase Synchronization Output | Digital clock output synchronized to GATE1 edge - used to daisy-chain additional LTC3862 controllers for >2-phase systems. |
| SYNC (Pin 11) | External Clock Input | Accepts 50–650kHz external clock - locks switching frequency and phase to system master clock for EMI reduction. |
| INTVCC (Pin 19) | 5V Gate Drive LDO Output | Supplies gate drivers; bypassed with ≥4.7µF ceramic capacitor - UVLO (3.3V rising) protects MOSFETs during brownout. |
| 3V8 (Pin 24) | 3.8V Analog/Digital LDO Output | Powers internal error amplifier, comparators, and logic - bypassed with 1nF ceramic capacitor near IC for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output ripple current by ~70% vs. single-phase, enabling smaller bulk capacitors and lower ESR requirements. |
| Programmable slope compensation (SLOPE pin) | Adjusts normalized gain (0.625× to 1.66×) to stabilize current mode control across wide duty cycles and inductor values. |
| Adjustable leading-edge blanking (BLANK pin) | Selects minimum on-time (180ns/260ns/340ns) to suppress gate-drive-induced current-sense noise during MOSFET turn-on. |
| Internal 5V/3.8V dual-LDO architecture | Eliminates need for external bias rails - INTVCC powers gate drivers; 3V8 powers precision analog blocks, improving PSRR and noise rejection. |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation with robust HTOL, TC, and ESD testing - suitable for engine-control and ADAS power modules. |
Applications
| Automotive 12V→48V Mild Hybrid System | Industrial Telecom Power Supply |
|---|---|
Use Scenario: Boosting vehicle battery (9–16V) to regulated 48V rail for active suspension, brake-by-wire, or 48V LED lighting. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel MOSFETs with synchronized gate drive and current balancing. Use Value: Interleaving cuts input capacitor RMS current by 50%, allowing smaller 1206-case MLCCs instead of large electrolytics. | Use Scenario: Generating isolated 48V intermediate bus from 24V industrial DC source for PoE++ switches or base station RF amplifiers. IC Role / Device Role / Timing Role: High-efficiency SEPIC controller supporting wide VIN range and maintaining regulation during line transients. Use Value: 96% max duty cycle enables stable 48V output even at 24V input, eliminating need for pre-regulator stage. |
| Medical Imaging Power Module | EV Onboard Charger Auxiliary Supply |
Use Scenario: Providing clean, low-noise 48V supply for X-ray detector biasing circuits requiring <10mVpp ripple. IC Role / Device Role / Timing Role: Precision current-mode controller with ±1% reference and matched current sense channels for tight load regulation. Use Value: ±10mV CH1/CH2 current sense matching ensures balanced phase current sharing, minimizing thermal hotspots. | Use Scenario: Generating auxiliary 12V/5V rails from 400V DC-link in bidirectional OBC using flyback-derived topology. IC Role / Device Role / Timing Role: Synchronized boost controller operating in SEPIC mode to handle reverse polarity fault conditions. Use Value: PLL synchronization (via SYNC) aligns switching edges across multiple converters, reducing conducted EMI peaks by 15dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost and SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862IUH#PBF | Same silicon, rated for –40°C to +125°C junction (vs. +150°C for H-grade). | Suitable for cabin electronics but not under-hood environments exceeding 125°C ambient. | Select when full AEC-Q100 Grade H thermal margin is unnecessary and cost optimization is prioritized. |
| LTC3862HFE#PBF | Same functionality and temperature rating, but in 24-lead TSSOP package (θJA = 38°C/W vs. 44°C/W for QFN). | Offers easier manual assembly and rework, but requires larger PCB area and has higher thermal resistance. | Choose for prototyping or low-volume production where thermal budget allows and QFN reflow is unavailable. |
Compared with LTC3862IUH#PBF, the LTC3862HUH#PBF provides extended high-temperature reliability for under-hood use, while compared with LTC3862HFE#PBF, it delivers superior thermal performance in space-constrained layouts despite identical electrical specs.
Availability
LTC3862HUH#PBF is available at Aetrix Electronics and suitable for automotive power conversion, industrial telecom supplies, and medical imaging equipment requiring stable component supply with AEC-Q100 compliance and extended temperature operation.
Supply support for LTC3862HUH#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 (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 connectivity applications.
The LTC3862 product line delivers high-efficiency, multi-phase DC/DC controllers optimized for automotive, industrial, and telecom boost and SEPIC power conversion with integrated LDOs and robust synchronization features.
FAQ
What is the maximum allowable input voltage for the LTC3862HUH#PBF?
The absolute maximum input supply voltage (VIN) for the LTC3862HUH#PBF is 40V, but its specified operational range is 4V to 36V. Exceeding 36V may trigger overvoltage protection or degrade long-term reliability. The device's internal 5V INTVCC LDO is powered from VIN, so sustained operation above 36V risks exceeding the INTVCC LDO's dropout and thermal limits. Always observe the 40V absolute maximum rating to prevent permanent damage.
How does the PHASEMODE pin affect multi-phase operation in the LTC3862HUH#PBF?
The PHASEMODE pin on the LTC3862HUH#PBF configures the phase relationship between Channel 1 and Channel 2 (180°/180°/120°) and between Channel 1 and CLKOUT (90°/60°/240°), enabling 2-, 3-, 4-, 6-, or 12-phase systems when daisy-chained. For example, setting PHASEMODE to SGND yields 180° interleaving ideal for two-phase operation, while floating it supports three-phase stacks using CLKOUT-to-SYNC routing. This flexibility allows scalable power delivery without changing the LTC3862HUH#PBF's core layout.
Can the LTC3862HUH#PBF be used in SEPIC topology, and what design considerations apply?
Yes, the LTC3862HUH#PBF supports SEPIC topology via its current-mode control architecture and dual N-channel gate drivers. Key considerations include using coupled inductors or separate L1/L2 windings, ensuring proper current sense placement on the switch node side, and verifying duty cycle limits (≤96%) to maintain C1 voltage within ratings. The device's adjustable slope compensation (SLOPE pin) and leading-edge blanking (BLANK pin) are critical for stabilizing SEPIC operation across line/load transients.
What is the purpose of the 3V8 pin on the LTC3862HUH#PBF, and how must it be decoupled?
The 3V8 pin on the LTC3862HUH#PBF is the output of an internal 3.8V LDO that powers all low-voltage analog and digital circuitry, including the error amplifier, comparators, and logic blocks. It must be decoupled with a 1nF X5R or better ceramic capacitor placed directly between 3V8 and SGND, as close as possible to the IC pins. This capacitor suppresses high-frequency noise coupling into the feedback and current-sense paths, ensuring stable regulation and accurate current limiting - failure to place this capacitor correctly degrades VFB accuracy and increases output ripple.
Does the LTC3862HUH#PBF require external components for soft-start, and how is it implemented?
Yes, the LTC3862HUH#PBF implements soft-start via an external capacitor connected from the SS pin to SGND. An internal 5µA current source charges this capacitor, ramping the ITH voltage and thus the peak inductor current limit linearly over time. A typical 10nF capacitor yields ~20ms soft-start duration. The RUN pin must remain above 1.22V during this period; pulling RUN low aborts soft-start and forces shutdown. No external resistor is needed - the SS pin functions as a voltage-controlled current sink tied to the error amplifier's output stage.
LTC3862HUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WQFN 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-QFN (5x5)
LTC3862HUH#PBF FAQ
1.How can I place an order for LTC3862HUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862HUH#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 LTC3862HUH#PBF reliable?
The price and inventory of LTC3862HUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862HUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862HUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862HUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862HUH#PBF?
LTC3862HUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862HUH#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 LTC3862HUH#PBF?
For technical support, including LTC3862HUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862HUH#PBF requirements.
6.How does Aetrix verify that LTC3862HUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862HUH#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 LTC3862HUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862HUH#PBF?
All LTC3862HUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862HUH#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 LTC3862HUH#PBF part is unused and in its original packaging.
Return procedure for LTC3862HUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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