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Analog Devices Inc. LTC3862IUH-2#PBF
- Part No.:
- LTC3862IUH-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WQFN Exposed Pad
- Datasheet:
-
LTC3862IUH-2#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:153
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Product details
Overview
LTC3862IUH-2#PBF from Analog Devices (formerly Linear Technology) is a two-phase, constant-frequency, peak current mode boost/SEPIC DC/DC controller driving external N-channel MOSFETs. It operates from 5.5V to 36V input, delivers up to 80V output, supports 75kHz–500kHz programmable switching frequency, and features internal 10V/3.8V LDOs, 96% max duty cycle, and ±1% reference accuracy - used in high-voltage industrial power supplies requiring phase interleaving.
For engineers reviewing the LTC3862IUH-2#PBF datasheet, LTC3862IUH-2#PBF pinout, LTC3862IUH-2#PBF application, or LTC3862IUH-2#PBF equivalent, key selection criteria include its dual-phase interleaved architecture, INTVCC UVLO threshold of 4.4V (rising), PHASEMODE-configurable multi-phase synchronization (2-/3-/4-/6-/12-phase), and QFN-24 thermal performance (θJA = 44°C/W).
Technical Context
The LTC3862IUH-2#PBF implements fixed-frequency peak current mode control with two independent channels operating 180° out-of-phase, reducing input/output ripple and filter component stress. Its error amplifier compares FB voltage against a 1.223V internal reference, modulating ITH to set per-cycle peak current via SENSE+/- inputs.
It integrates cascaded LDOs: a 10V INTVCC regulator powers gate drivers (with 4.4V UVLO rising threshold), and a 3.8V LDO (3V8) supplies analog/digital circuitry. Phase synchronization uses PLL-based CLKOUT/SYNC with PHASEMODE pin-selectable channel alignment (120°/180°) and external clock lock range of 50kHz–650kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Two-phase boost/SEPIC controller - enables interleaved operation to halve input/output ripple current and reduce capacitor sizing. |
| Input Voltage Range | 5.5V to 36V - supports wide-range industrial and telecom inputs including 12V, 24V, and 32V rails. |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable); 50kHz–650kHz (SYNC-locked) - allows EMI optimization and inductor size trade-offs. |
| Max Duty Cycle | 96% (DMAX = SGND), 84% (DMAX = float), 75% (DMAX = 3V8) - enables high step-up ratios (e.g., 12V→80V) with margin for gate drive loss. |
| Reference Voltage | 1.223V ±1% - ensures precise output regulation across temperature and line variations in feedback divider networks. |
| INTVCC UVLO Threshold | Rising: 4.4V, Falling: 3.9V - protects gate drivers from under-biasing while enabling use of 6VGSS MOSFETs. |
| Package & Temp Grade | 24-pin 5mm × 5mm QFN (UH), –40°C to +125°C - thermally enhanced for high-power density industrial designs. |
Pinout & Package
Package: 24-lead (5mm × 5mm) plastic QFN with exposed PGND pad (Pin 25), 0.65mm lead pitch, θJA = 44°C/W. Requires soldering of exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 17, Exposed Pad Pin 25) | Power Ground Reference | Return path for MOSFET source currents and INTVCC bypass; must be low-inductance connection to PCB ground plane. |
| GATE1 / GATE2 (Pins 18, 16) | N-Channel MOSFET Gate Drivers | 10V gate drive referenced to PGND; capable of driving high-QG MOSFETs with RDS(ON) rated at VGS = 6V. |
| SENSE1+/SENSE2+, SENSE1–/SENSE2– (Pins 23,13,22,14) | Current Sense Inputs | Differential inputs for per-phase peak current detection; matched thresholds (±7mV) enable balanced interleaved current sharing. |
| FREQ (Pin 5) | Frequency Programming Input | Resistor-to-SGND sets oscillator frequency; nominal 1.223V at pin enables accurate resistor-based tuning. |
| PHASEMODE (Pin 4) | Multi-Phase Configuration Control | Selects CH1–CH2 phase offset (180°/180°/120°) and CH1–CLKOUT relationship (90°/60°/240°) for 2-/3-/4-/6-/12-phase systems. |
| DMAX (Pin 1) | Maximum Duty Cycle Control | Three-state logic (SGND/float/3V8) selects 96%/84%/75% limit - critical for stability in high-VOUT/low-VIN boost applications. |
| INTVCC (Pin 19) | 10V Gate Driver Supply Output | Internally regulated LDO output; requires ≥4.7µF X5R ceramic bypass to PGND; not intended for external loads. |
| 3V8 (Pin 24) | 3.8V Analog/Digital Supply Output | Secondary LDO powered from INTVCC; supplies internal circuitry only; bypassed with 1nF ceramic to SGND. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output RMS current by ~30%, allowing smaller input capacitors and lower ESR output caps in high-current boost designs. |
| Programmable leading edge blanking | Configurable minimum on-time (210ns/290ns/375ns via BLANK pin) prevents false current-sense triggering during MOSFET turn-on transients. |
| Adjustable slope compensation gain | SLOPE pin (float/3V8/SGND) scales compensation by 1.00/1.66/0.625 - stabilizes current mode control across varying duty cycles and inductors. |
| Internal 10V/3.8V dual-LDO architecture | Eliminates need for external bias supplies; INTVCC UVLO (4.4V) enables safe gate drive for 6V-rated MOSFETs without external supervision. |
| SYNC/CLKOUT with PLL synchronization | Enables deterministic phase alignment across multiple LTC3862IUH-2#PBF controllers for scalable multi-phase systems up to 12 phases. |
Applications
| Industrial High-Voltage Power Supplies | Telecom Line Card Boost Converters |
|---|---|
|
Use Scenario: Generating stable 48V–80V outputs from 12V or 24V intermediate bus in factory automation PLCs and motor drives. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved gate timing, current sensing, and loop compensation for high-efficiency step-up conversion. Use Value: Reduces output capacitor count by 40% vs single-phase design while maintaining <1% output ripple at 7A load. |
Use Scenario: Providing isolated 54V bias for PoE++ PSE controllers and optical module transceivers in 48V telecom shelves. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller synchronizing to system clock via SYNC pin for EMI compliance in dense line cards. Use Value: Achieves >93% efficiency at 6A load with 12V input, leveraging 96% max duty cycle and low-loss 10V gate drive. |
| Automotive ADAS Camera Power Modules | Test Equipment High-Voltage Bias Supplies |
|
Use Scenario: Powering 70V image sensors and SerDes interfaces in automotive surround-view camera ECUs with extended temperature operation. IC Role / Device Role / Timing Role: Dual-channel boost controller delivering regulated output with thermal shutdown and precise UVLO (–40°C to +125°C grade). Use Value: Maintains stable 72V output across cold-crank (6V) to load-dump (32V) conditions using programmable DMAX and robust INTVCC regulation. |
Use Scenario: Programmable 30–80V, 1–5A bias supply for semiconductor parametric testers and laser diode drivers requiring low-noise, fast transient response. IC Role / Device Role / Timing Role: Precision-controlled boost controller with ±1% reference and soft-start (SS pin) for repeatable, glitch-free voltage ramp-up. Use Value: Enables <50µs transient recovery time and <0.1% load regulation via high-gain error amplifier (660 µ℧) and ITH-based loop compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar two-phase boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862EUH-2#PBF | Same silicon, –40°C to +85°C temp grade; identical pinout, specs, and feature set. | Targeted for commercial/industrial environments without extended temperature requirements. | Select when ambient operating temperature remains ≤85°C; offers same performance at lower cost and broader distributor availability. |
| LTC3862HUH-2#PBF | Same silicon, –40°C to +150°C temp grade; identical electrical specs and package. | Required for under-hood automotive or high-ambient industrial deployments where junction temperatures exceed 125°C. | Choose for mission-critical thermal environments; shares layout and firmware but guarantees operation up to TJ = 150°C. |
Compared with LTC3862IUH-2#PBF, the EUH variant reduces cost for non-extended-temperature use cases, while the HUH variant adds guaranteed high-temperature reliability - all three share identical functionality, pin compatibility, and layout footprint.
Availability
LTC3862IUH-2#PBF is available at Aetrix Electronics and suitable for industrial high-voltage power supplies, telecom line card boost converters, and automotive ADAS camera modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3862IUH-2#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 acquired Linear Technology in 2017 and maintains full product continuity, technical support, and manufacturing for the LTC portfolio.
The LTC3862 series was designed as a high-performance, multi-phase current-mode controller family targeting high-efficiency, high-voltage DC/DC conversion in industrial, telecom, and automotive applications where thermal density and EMI control are critical.
FAQ
What is the maximum output voltage achievable with the LTC3862IUH-2#PBF in a boost configuration?
The LTC3862IUH-2#PBF itself does not impose a hard upper limit on output voltage; it is a controller, not a regulator. In practice, output voltage is determined by external components - primarily the MOSFET VDS rating, diode reverse voltage, and output capacitor voltage rating. Typical validated designs achieve 80V output (e.g., VIN = 12V → VOUT = 80V), and the LTC3862IUH-2#PBF's 96% max duty cycle and robust gate drive support such high step-up ratios reliably.
Does the LTC3862IUH-2#PBF support SEPIC topology, and what external components are required?
Yes, the LTC3862IUH-2#PBF supports SEPIC topology in addition to boost. It requires two inductors (coupled or uncoupled), a SEPIC capacitor (CSEPIC) between input and output, and appropriate MOSFET/diode placement per channel. The controller's dual-phase, current-mode architecture and independent SENSE+/- inputs allow precise per-phase current control in SEPIC mode, enabling continuous conduction mode operation and reduced ripple compared to single-phase implementations.
How does the PHASEMODE pin affect synchronization in multi-controller systems using the LTC3862IUH-2#PBF?
The PHASEMODE pin on the LTC3862IUH-2#PBF configures both inter-channel phase alignment (CH1 vs CH2) and master-slave relationship (CH1 vs CLKOUT). When tied to SGND, it sets 180° CH1–CH2 offset and 90° CH1–CLKOUT; floating yields 180°/60°; tying to 3V8 gives 120°/240°. This enables deterministic daisy-chaining of up to 12 phases using CLKOUT→SYNC routing, ensuring uniform current sharing and minimized input ripple in stacked configurations.
What is the purpose of the 3V8 pin on the LTC3862IUH-2#PBF, and can it power external circuitry?
The 3V8 pin on the LTC3862IUH-2#PBF is the output of an internal LDO powered from INTVCC, providing a regulated 3.8V supply exclusively for the IC's internal analog and digital circuitry (e.g., error amplifier, comparators, logic). It is not rated for external loads - the datasheet explicitly states it is "not intended to be used as a supply for external circuitry." External circuits must use separate regulators; the 3V8 pin requires only a 1nF ceramic bypass capacitor to SGND.
Can the LTC3862IUH-2#PBF operate with a 5V input supply?
No - the LTC3862IUH-2#PBF has a minimum input voltage specification of 5.5V. Operation below 5.5V violates the Absolute Maximum Ratings and may result in improper startup, unstable regulation, or failure to engage the INTVCC LDO. For 5V-input applications, designers should consider alternative controllers such as the LTC3780 or LTC3805, which support lower VIN ranges while retaining multi-phase capability.
LTC3862IUH-2#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):
- 5.5V ~ 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-QFN (5x5)
LTC3862IUH-2#PBF FAQ
1.How can I place an order for LTC3862IUH-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862IUH-2#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 LTC3862IUH-2#PBF reliable?
The price and inventory of LTC3862IUH-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862IUH-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862IUH-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862IUH-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862IUH-2#PBF?
LTC3862IUH-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862IUH-2#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 LTC3862IUH-2#PBF?
For technical support, including LTC3862IUH-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862IUH-2#PBF requirements.
6.How does Aetrix verify that LTC3862IUH-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862IUH-2#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 LTC3862IUH-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862IUH-2#PBF?
All LTC3862IUH-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862IUH-2#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 LTC3862IUH-2#PBF part is unused and in its original packaging.
Return procedure for LTC3862IUH-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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