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Analog Devices Inc. LTC3862EUH#PBF
- Part No.:
- LTC3862EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WQFN Exposed Pad
- Datasheet:
-
LTC3862EUH#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:718
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Product details
Overview
LTC3862EUH#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 adjustable switching frequency, and integrates dual 5V gate drivers with internal 5V/3.8V LDOs. It enables high-efficiency 48V telecom power supplies with reduced input/output filtering.
For engineers reviewing the LTC3862EUH#PBF datasheet, LTC3862EUH#PBF pinout, LTC3862EUH#PBF application, or LTC3862EUH#PBF equivalent, key selection criteria include multi-phase synchronization capability (SYNC/CLKOUT/PHASEMODE), programmable leading-edge blanking (BLANK), slope compensation gain adjustment (SLOPE), ±1% reference accuracy, and thermal performance in the 5mm × 5mm QFN package.
Technical Context
The LTC3862EUH#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 (EA) compares FB voltage against a 1.223V internal reference and drives ITH to modulate peak inductor current per channel.
Phase synchronization uses an internal PLL with SYNC input (50kHz–650kHz range) and CLKOUT output; PHASEMODE pin selects 120°, 180°, or 240° inter-channel timing. The DMAX pin sets maximum duty cycle (75%, 84%, or 96%) via precise internal 12× clock derivation, while BLANK and SLOPE pins configure minimum on-time (180–340ns) and slope compensation gain (0.625–1.66× normalized).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports wide-input industrial and automotive battery-fed boost applications. |
| Switching Frequency | 75kHz to 500kHz - set by single external resistor on FREQ pin; enables optimization of size vs. efficiency trade-offs. |
| Max Duty Cycle | Up to 96% - configurable via DMAX pin; allows high step-up ratios (e.g., 12V→48V) without requiring excessive turns ratio. |
| Reference Voltage | 1.223V ±1% - high-accuracy FB reference ensures stable output regulation under load and line transients. |
| Gate Drive | 5V @ PGND - logic-level compatible for low-RDS(on) N-MOSFETs; reduces conduction losses in high-current boost stages. |
| Thermal Resistance θJA | 44°C/W - measured in 5mm × 5mm QFN (UH) package; enables >5A output at 85°C ambient with proper PCB copper area. |
| Operating Temp | –40°C to +85°C - commercial-grade temperature range suitable for telecom and industrial power systems. |
Pinout & Package
Package: 24-lead (5mm × 5mm) plastic QFN with 0.65mm lead pitch and exposed PGND pad (Pin 25). Requires soldering of exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Maximum duty cycle programming | Connect to SGND for 96%, float for 84%, or 3V8 for 75% - enables precise overvoltage protection and transformer saturation margining. |
| GATE1/GATE2 (Pins 18/16) | N-MOSFET gate drive outputs | 5V CMOS outputs referenced to PGND - directly drive logic-level MOSFETs without level-shifting; RDS(on) = 2.1Ω pull-up / 0.7Ω pull-down. |
| SENSE1+/SENSE2+ (Pins 23/13) | Current sense positive inputs | Differential inputs to peak current comparators - interface with low-side sense resistors (e.g., 6mΩ) for accurate per-phase current limiting. |
| FB (Pin 8) | Error amplifier inverting input | Connects to resistive divider from VOUT - sets regulated output voltage (e.g., 48V) with ±1% accuracy over temperature and line. |
| SYNC (Pin 11) | PLL synchronization input | Accepts 50–650kHz external clock - aligns GATE1 rising edge to SYNC rising edge; enables deterministic multi-phase interleaving. |
| CLKOUT (Pin 10) | Phase-locked clock output | Drives SYNC input of downstream LTC3862 - enables daisy-chained 2-, 3-, 4-, 6-, or 12-phase operation without external timing components. |
| INTVCC (Pin 19) | 5V gate driver LDO output | Bypass with ≥4.7µF ceramic to PGND - powers gate drivers; UVLO threshold 3.3V (rising) prevents weak turn-on during brownout. |
| 3V8 (Pin 24) | 3.8V analog/digital LDO output | Bypass with 1nF ceramic to SGND - powers internal EA, oscillators, and logic; isolated from INTVCC to prevent noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved architecture | Reduces input/output capacitor RMS current by ~70% versus single-phase, enabling smaller, lower-cost bulk capacitance. |
| Programmable leading-edge blanking (BLANK) | Selects 180ns (SGND), 260ns (float), or 340ns (3V8) blanking - suppresses gate-drive-induced current-sense noise during MOSFET turn-on. |
| Adjustable slope compensation (SLOPE) | Gain scaling of 0.625× (SGND), 1.0× (float), or 1.66× (3V8) - stabilizes current mode control across wide duty-cycle and inductance ranges. |
| Precision RUN pin with hysteresis | 1.22V enable threshold with 80mV hysteresis - provides clean, noise-immune startup/shutdown sequencing without external RC networks. |
| Internal 5V/3.8V cascaded LDOs | Eliminates need for external bias rails - INTVCC powers gate drivers; 3V8 powers sensitive analog circuitry, minimizing supply interaction. |
Applications
| Telecom Power Supply | Automotive ADAS Camera Power |
|---|---|
Use Scenario: Generating stable 48V bus from 12V vehicle battery for PoE-powered cameras and radar modules. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved inductor currents and synchronized gate drive timing to minimize EMI. Use Value: Achieves >94% efficiency at 5A output while meeting CISPR-25 Class 5 conducted emissions limits due to reduced ripple and spread-spectrum-capable SYNC input. | Use Scenario: High-reliability 24V-to-48V boost converter in automotive camera ECU with extended temperature operation. IC Role / Device Role / Timing Role: Dual-channel current-mode controller providing fault-tolerant power delivery with independent channel current monitoring via SENSE+/- pins. Use Value: Supports AEC-Q100-compliant design (via I/H-grade variants) with programmable DMAX and BLANK to maintain stability across –40°C to +125°C junction temperatures. |
| Industrial IoT Gateway Power | Test Equipment Auxiliary Supply |
Use Scenario: Compact 48V/3A boost supply for wireless gateway with limited board space and strict thermal constraints. IC Role / Device Role / Timing Role: QFN-packaged controller delivering high power density using thermally enhanced 5mm × 5mm footprint and exposed PGND pad. Use Value: Enables 44°C/W θJA performance with minimal copper area, allowing full-load operation at 70°C ambient without forced air cooling. | Use Scenario: Programmable auxiliary supply in benchtop test equipment requiring precise output voltage tracking and fast transient response. IC Role / Device Role / Timing Role: Precision reference (±1%) and soft-start (SS pin) controlled controller ensuring repeatable startup behavior and minimal output overshoot. Use Value: Delivers <1% output voltage deviation over line/load/temperature, with SS-controlled ramp rate preventing inrush into downstream DUTs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862IUH#PBF | Same pinout and functionality; rated for –40°C to +125°C junction temperature (vs. +85°C for EUH). | Suitable for under-hood automotive or high-ambient industrial environments where extended temperature operation is required. | Select when operating junction temperature exceeds 85°C; otherwise LTC3862EUH#PBF offers cost advantage for commercial-temp designs. |
| LTC3862HUH#PBF | Same pinout and functionality; rated for –40°C to +150°C junction temperature with enhanced thermal robustness. | Required for high-power-density applications with minimal heatsinking or sustained high ambient conditions (e.g., enclosed enclosures). | Choose only if thermal modeling confirms TJ > 125°C; adds cost premium without benefit in standard commercial applications. |
Compared with LTC3862IUH#PBF and LTC3862HUH#PBF, the LTC3862EUH#PBF provides identical electrical performance and feature set at the lowest cost for applications constrained to ≤85°C ambient, making it optimal for telecom infrastructure, industrial gateways, and general-purpose boost converters where extended temperature grade is unnecessary.
Availability
LTC3862EUH#PBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive ADAS camera systems, and industrial IoT gateways requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for LTC3862EUH#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.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC3862EUH#PBF belongs to the Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding boost, SEPIC, and multi-phase power conversion in telecom, automotive, and industrial applications.
FAQ
What is the maximum achievable output voltage using LTC3862EUH#PBF in a boost configuration?
The LTC3862EUH#PBF itself does not impose a hard upper limit on output voltage; instead, practical limits derive from external component ratings and stability constraints. With its 96% max duty cycle and 36V maximum VIN, the LTC3862EUH#PBF can reliably generate outputs up to 48V (e.g., 12V→48V at 75% duty) in well-designed boost stages using appropriately rated MOSFETs, diodes, and output capacitors. Higher voltages require careful attention to layout, snubbing, and slope compensation tuning to maintain loop stability.
Does LTC3862EUH#PBF support synchronization to an external clock, and what is the valid frequency range?
Yes, the LTC3862EUH#PBF supports external clock synchronization via its SYNC pin, which accepts input frequencies from 50kHz to 650kHz. The internal PLL locks the switching frequency to the external clock, aligning the rising edge of GATE1 with the SYNC rising edge. This capability enables deterministic multi-phase interleaving across multiple LTC3862EUH#PBF devices in high-current systems, reducing input/output ripple and improving EMI performance.
How is the switching frequency set on LTC3862EUH#PBF, and what tolerance should be expected?
The switching frequency of the LTC3862EUH#PBF is set using a single resistor (RFREQ) connected between the FREQ pin and SGND. The nominal frequency is calculated as fOSC ≈ 106/RFREQ(kΩ) kHz, covering 75kHz to 500kHz. At 25°C with RFREQ = 45.6kΩ, typical frequency is 300kHz ±2%. Over temperature and process variation, frequency drift remains within ±10% across the full operating range, as specified in the Electrical Characteristics table.
Can LTC3862EUH#PBF drive standard-threshold MOSFETs, or is it limited to logic-level devices?
The LTC3862EUH#PBF is optimized for logic-level N-channel MOSFETs, providing 5V gate drive referenced to PGND. While it can partially enhance standard-threshold MOSFETs (e.g., VGS(th) = 3V), full enhancement and reliable operation require VGS ≥ 8V–10V - beyond the LTC3862EUH#PBF's 5V capability. For standard-threshold devices, Analog Devices recommends the LTC3862-1 variant, which features a 10V gate drive and higher INTVCC UVLO thresholds tailored for higher-VGS operation.
What is the purpose of the 3V8 pin on LTC3862EUH#PBF, and how must it be decoupled?
The 3V8 pin on the LTC3862EUH#PBF is the output of an internal 3.8V LDO powered from INTVCC, supplying low-noise power to internal analog and digital circuitry (error amplifier, oscillators, logic). It must be decoupled with a 1nF X5R/X7R ceramic capacitor placed directly between 3V8 and SGND, as close as possible to the IC. This capacitor suppresses high-frequency noise and ensures stable reference and control loop operation; external loads on 3V8 are not supported.
LTC3862EUH#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (5x5)
LTC3862EUH#PBF FAQ
1.How can I place an order for LTC3862EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862EUH#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 LTC3862EUH#PBF reliable?
The price and inventory of LTC3862EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862EUH#PBF?
LTC3862EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862EUH#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 LTC3862EUH#PBF?
For technical support, including LTC3862EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862EUH#PBF requirements.
6.How does Aetrix verify that LTC3862EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862EUH#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 LTC3862EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862EUH#PBF?
All LTC3862EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862EUH#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 LTC3862EUH#PBF part is unused and in its original packaging.
Return procedure for LTC3862EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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