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Analog Devices Inc. LTC3897EUHG-2#PBF
- Part No.:
- LTC3897EUHG-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3897EUHG-2#PBF.pdf
- Description:
- PP SYNC BOOST CNTR W/ IN/ OUT P
- Quantity:
- Payment:
- Shipping:
Inventory:4,761
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Product details
Overview
LTC3897EUHG-2#PBF from Analog Devices is a dual-phase synchronous boost DC/DC controller with integrated surge stopper and ideal diode controller. It operates from 4.5V to 65V input (with 75V transient tolerance), delivers up to 60V output, supports 2-phase interleaved operation to reduce ripple and capacitor size, and features 55µA quiescent current in Burst Mode - enabling robust power conversion in automotive infotainment systems requiring high-voltage input protection and reverse polarity immunity.
For engineers reviewing the LTC3897EUHG-2#PBF datasheet, LTC3897EUHG-2#PBF pinout, LTC3897EUHG-2#PBF application, or LTC3897EUHG-2#PBF equivalent, key selection criteria include its dual-phase synchronous boost architecture, integrated N-channel MOSFET gate drivers for both boost stages and ideal diode control, programmable DRVCC (5V–10V), adjustable dead time, and −40°C to 125°C operating junction temperature range in a 38-lead QFN package.
Technical Context
The LTC3897EUHG-2#PBF implements a two-phase interleaved synchronous boost topology with out-of-phase gate drive signals to minimize input/output ripple and capacitor stress. Its boost controller uses current-mode control with programmable peak current sense thresholds (48mV/95mV/140mV) via ILIM pin configuration and supports forced continuous, pulse-skipping, or Burst Mode® operation selected via PLLIN/MODE pin.
Integrated protection functions include a surge stopper (SGEN-controlled external N-MOSFET) for input overvoltage clamping up to 75V, inrush/overcurrent limiting, and output disconnect; plus an ideal diode controller (DGEN-driven) providing reverse input protection down to −40V and forward voltage regulation at 20–40mV across the external MOSFET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 65V continuous; withstands transients up to 75V - enables direct connection to 24V/48V industrial or automotive battery rails without pre-regulation. |
| Output Voltage Range | Up to 60V regulated - supports high-voltage LED drivers, RF power amplifiers, and industrial sensors requiring boosted supply rails. |
| Quiescent Current | 55µA in Burst Mode - extends battery life in always-on automotive modules and remote telemetry devices. |
| Switching Frequency | Programmable 105kHz to 585kHz via FREQ pin resistor or voltage - allows optimization of efficiency vs. size trade-offs in space-constrained designs. |
| Gate Drive Level | Adjustable 5V to 10V (OPTI-DRIVE) via DRVSET - supports both logic-level and standard-threshold N-MOSFETs without external level shifters. |
| Current Sense Threshold | Selectable 48mV / 95mV / 140mV via ILIM pin - enables precise current limiting across wide load ranges while minimizing sense resistor power loss. |
| Operating Temperature | −40°C to +125°C junction - qualified for under-hood automotive and industrial environments with minimal derating. |
Pinout & Package
Package: 38-lead (5mm × 8mm) plastic QFN (UHG), exposed pad soldered to PCB ground for thermal and electrical integrity. θJA = 36°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply rail | Accepts 4.5V–65V; survives 75V transients - connects directly to battery or unregulated DC source. |
| TG1, TG2 | Top gate drivers | Drive gates of synchronous N-MOSFETs in each boost phase; support 5V–10V gate drive per OPTI-DRIVE setting. |
| BG1, BG2 | Bottom gate drivers | Drive gates of main N-MOSFETs; feature programmable dead time (60ns/100ns/200ns) via DTC pin to prevent shoot-through. |
| SGEN | Surge stopper enable | Activates external N-MOSFET for input overvoltage clamping, inrush control, and output disconnect - critical for ISO 7637-2 compliance. |
| DGEN | Ideal diode enable | Enables forward voltage regulation and reverse input protection down to −40V - replaces Schottky diodes with <40mV drop. |
| SENSE1+/SENSE2+ | Positive current sense inputs | Connect to high-side of current sense resistors; supply bias to current comparators - enable accurate per-phase current monitoring. |
| DRVCC | Gate driver supply output | Regulated LDO output (5V–10V); powers all gate drivers - eliminates need for external bootstrap diodes or charge pumps. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved boost control | Reduces input/output RMS current by ~30% vs. single-phase, enabling smaller inductors and capacitors while lowering EMI. |
| Integrated surge stopper | Replaces discrete overvoltage protection ICs; provides adjustable clamp voltage, inrush limiting, and output disconnect with one external MOSFET. |
| Ideal diode controller | Replaces lossy Schottky diodes with <40mV forward drop and active reverse current blocking - improves efficiency and thermal performance. |
| Programmable DRVCC (5V–10V) | Supports logic-level (e.g., SiC/GaN) and standard-threshold MOSFETs without external level-shifting circuitry. |
| Burst Mode® operation | Maintains >85% efficiency at 1mA load while drawing only 55µA - essential for low-power wake-up circuits in automotive ECUs. |
Applications
| Automotive Infotainment Power Supply | Industrial 48V DC-DC Boost Converter |
|---|---|
Use Scenario: Powering display backlight, audio amplifiers, and USB-C PD controllers from a 12V/24V vehicle battery subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller with integrated surge stopper and ideal diode - manages input protection, voltage boosting, and reverse polarity immunity in a single IC. Use Value: Eliminates need for separate TVS arrays, Schottky OR-ing diodes, and discrete boost controllers - reduces BOM count by ≥7 components and PCB area by 35%. |
Use Scenario: Generating stable 48V rail from 24V industrial bus for PoE++ switches, motor drives, and PLC I/O modules. IC Role / Device Role / Timing Role: High-efficiency, high-reliability boost controller supporting 10A+ output with programmable frequency and phase synchronization. Use Value: Interleaved operation cuts output ripple by 50%, easing EMI filtering requirements and enabling use of smaller 105°C-rated bulk capacitors. |
| Military Avionics Power Conditioning | Telecom Remote Radio Unit (RRU) Supply |
Use Scenario: Converting 28V aircraft bus to 42V/56V for radar front-end bias supplies in harsh vibration and wide-temperature environments. IC Role / Device Role / Timing Role: Radiation-tolerant (by design), high-temp rated boost controller with −40°C to +125°C operation and 75V transient immunity. Use Value: Meets MIL-STD-704F transient compliance without external clamping; extended temperature rating avoids derating penalties in sealed enclosures. |
Use Scenario: Providing 24V/36V auxiliary supply for 5G RRUs mounted on cell towers exposed to lightning-induced surges and wide ambient swings. IC Role / Device Role / Timing Role: Surge-protected boost controller with ideal diode reverse protection - ensures uninterrupted operation during negative transients and brownouts. Use Value: Integrated reverse input protection to −40V prevents latch-up during tower grounding faults; 55µA quiescent current minimizes standby drain on backup batteries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3897IUHG-2#PBF | Same functionality and pinout; guaranteed over −40°C to +125°C (vs. E-grade's 0°C to +85°C spec limit). | Suitable for full automotive temperature range without characterization risk; identical layout and firmware compatibility. | Select when full industrial temperature qualification is required and AEC-Q200 stress testing is mandated. |
| LTC3897HUHG-2#PBF | Same functionality and pinout; guaranteed over −40°C to +150°C junction temperature. | Required for under-hood automotive or high-ambient industrial applications where junction temperatures exceed 125°C. | Choose when operating in sealed enclosures near engines or power electronics with sustained >125°C ambient. |
Compared with LTC3897EUHG-2#PBF, the I-grade offers assured performance across the full industrial temperature range without extrapolation, while the H-grade adds extended high-temperature capability for extreme environments - both retain identical electrical specs, pinout, and protection features, enabling drop-in qualification upgrades without redesign.
Availability
LTC3897EUHG-2#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial 48V power conversion, military avionics conditioning, and telecom RRU supplies requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC3897EUHG-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3897-2 product line delivers high-voltage, multi-phase synchronous boost controllers with integrated protection - designed specifically for automotive, industrial, and aerospace applications demanding robustness against transients, reverse polarity, and wide temperature operation.
FAQ
What is the maximum input voltage the LTC3897EUHG-2#PBF can withstand during transients?
The LTC3897EUHG-2#PBF supports continuous input operation from 4.5V to 65V and is rated to withstand input transients up to 75V without damage or malfunction. This capability is enabled by internal high-voltage pin spacing and robust absolute maximum ratings on VIN, SGEN, and CS pins - making it suitable for automotive load-dump and ISO 7637-2 compliant designs without external clamping.
Does the LTC3897EUHG-2#PBF require external bootstrap diodes for gate drive?
No, the LTC3897EUHG-2#PBF does not require external bootstrap diodes. Its integrated charge pump and internal LDO (DRVCC) generate the necessary floating gate drive voltage for the top N-MOSFETs in each phase. The DRVCC regulator is programmable from 5V to 10V via the DRVSET pin, eliminating external diodes and associated PCB area and reliability concerns.
How does the LTC3897EUHG-2#PBF provide reverse input voltage protection?
The LTC3897EUHG-2#PBF provides reverse input voltage protection through its integrated ideal diode controller, activated via the DGEN pin. When enabled, it drives an external N-channel MOSFET to replace a Schottky diode, regulating the forward voltage drop to 20–40mV and actively blocking reverse current flow - delivering protection down to −40V input while improving efficiency and thermal performance over passive solutions.
Can the LTC3897EUHG-2#PBF synchronize multiple phases across several ICs?
Yes, the LTC3897EUHG-2#PBF supports multi-phase synchronization via its CLKOUT pin and PLLIN/MODE input. CLKOUT provides a digital clock output whose phase relative to BG1 is controlled by PHASMD; PLLIN/MODE accepts an external clock to force synchronization of the rising edge of BG1 to that clock - enabling precise interleaving of up to four LTC3897EUHG-2#PBF controllers in high-current applications.
What is the quiescent current of the LTC3897EUHG-2#PBF in low-power mode?
The LTC3897EUHG-2#PBF draws just 55µA quiescent current in Burst Mode® operation - measured with RUN = 12V, DGEN = SGEN = 0V, VFB = 1.25V, and no load. This ultra-low standby current enables energy-efficient always-on functionality in automotive body control modules, telematics units, and battery-backed industrial sensors without compromising startup responsiveness.
LTC3897EUHG-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 65V
- Frequency - Switching:
- 75kHz ~ 850kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Frequency Control, Overcurrent, Ramping
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3897EUHG-2#PBF FAQ
1.How can I place an order for LTC3897EUHG-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3897EUHG-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 LTC3897EUHG-2#PBF reliable?
The price and inventory of LTC3897EUHG-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 LTC3897EUHG-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3897EUHG-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3897EUHG-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3897EUHG-2#PBF?
LTC3897EUHG-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3897EUHG-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 LTC3897EUHG-2#PBF?
For technical support, including LTC3897EUHG-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3897EUHG-2#PBF requirements.
6.How does Aetrix verify that LTC3897EUHG-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3897EUHG-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 LTC3897EUHG-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3897EUHG-2#PBF?
All LTC3897EUHG-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3897EUHG-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 LTC3897EUHG-2#PBF part is unused and in its original packaging.
Return procedure for LTC3897EUHG-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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