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Analog Devices Inc. LTC3897IUHF#TRPBF
- Part No.:
- LTC3897IUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3897IUHF#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK BOOST 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,703
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Product details
Overview
LTC3897IUHF#TRPBF 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, and features 55µA quiescent current in Burst Mode. Its two out-of-phase N-MOSFET stages reduce input/output capacitance and EMI, making it suitable for high-reliability 24V/10A industrial power supplies.
For engineers reviewing the LTC3897IUHF#TRPBF datasheet, LTC3897IUHF#TRPBF pinout, LTC3897IUHF#TRPBF application, or LTC3897IUHF#TRPBF equivalent, key selection considerations include its dual-phase timing control, adjustable gate drive (5–10V OPTI-DRIVE), ±40V reverse input protection, programmable frequency (105–465kHz), and integrated fault management via SGEN/DGEN pins.
Technical Context
The LTC3897IUHF#TRPBF implements a polyphase synchronous boost architecture with independent current-mode control per phase, using SENSE1+/– and SENSE2+/– inputs for peak-current limiting. Its error amplifier (1.200V VFB, 2mmho gm) drives ITH to modulate duty cycle while supporting pulse-skipping, forced continuous, and Burst Mode operation.
Surge protection is handled by the SGEN-controlled external N-MOSFET gate driver (SG pin), with overvoltage clamping (1.235V SPFB reference), overcurrent detection (45–55mV ΔVIS threshold), and programmable retry via TMR. The DGEN-controlled ideal diode function regulates forward voltage drop (20–40mV ΔVSD) and blocks reverse current during input faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 65V operating; withstands 75V transients - enables direct connection to automotive battery, 48V industrial rails, and unregulated HV sources. |
| Output Voltage Range | Up to 60V regulated - supports high-voltage LED drivers, RF amplifiers, and legacy 48V telecom systems without secondary regulation. |
| Quiescent Current | 55µA in Burst Mode - extends battery life in always-on monitoring systems and low-power remote sensors. |
| Switching Frequency | Programmable 105–465kHz (via FREQ pin resistor or voltage) - allows optimization of inductor size vs. efficiency across load conditions. |
| Gate Drive Level | Adjustable 5V–10V (OPTI-DRIVE via DRVSET) - supports both logic-level and standard-threshold N-MOSFETs without external level shifters. |
| Reverse Input Protection | –40V tolerance with ideal diode control - prevents damage from accidental battery reversal or negative transients in vehicle-mounted equipment. |
| Current Sense Threshold | Configurable 41–155mV (via ILIM pin: GND/float/INTVCC) - enables precise overcurrent protection scaling for 5mΩ to 20mΩ sense resistors. |
Pinout & Package
The LTC3897IUHF#TRPBF is housed in a thermally enhanced 38-pin (5mm × 7mm) leadless QFN package (UHF) with exposed thermal pad (Pin 39 = GND). This package provides θJA = 34°C/W and supports high-power density layouts with minimal PCB area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 4.5–65V input; survives 75V surges - connects directly to battery or unregulated DC bus. |
| SG | Surge stopper gate driver output | Drives external N-MOSFET source to clamp input overvoltage and limit inrush - requires no external bootstrap diode. |
| DG | Ideal diode gate driver output | Controls reverse-blocking N-MOSFET at input; regulates forward drop to 20–40mV - replaces Schottky with lower loss and no leakage. |
| TG1/TG2 | Top gate drivers (Phase 1 & 2) | Drive synchronous rectifier MOSFET gates - supports 100ns minimum on-time and 96% max duty cycle. |
| BG1/BG2 | Bottom gate drivers (Phase 1 & 2) | Drive main boost switch MOSFET gates - includes programmable dead time (60–275ns) via DTC pin. |
| SENSE1+/–, SENSE2+/– | Dual-channel current sense inputs | Measure inductor current per phase with matched thresholds - enables accurate current balancing in 2-phase operation. |
| SPFB | Surge protection feedback | Compares against 1.235V internal reference to trigger overvoltage shutdown - sets clamp voltage via external resistor divider. |
| SGEN/DGEN | Enable inputs for surge stopper / ideal diode | Independent digital enables allow selective activation - e.g., disable ideal diode during cold cranking while retaining surge protection. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase synchronous boost | Reduces input/output capacitor requirements by ~50% and lowers ripple current vs. single-phase - cuts BOM cost and board space. |
| Integrated surge stopper | Replaces discrete TVS + MOSFET controller - provides adjustable overvoltage clamp, inrush limiting, and output disconnect without external ICs. |
| Onboard ideal diode controller | Eliminates Schottky losses and thermal derating - achieves <10mW conduction loss at 10A vs. >2W for 40V Schottky. |
| OPTI-DRIVE gate voltage control | Single-pin (DRVSET) programming of 5–10V gate drive - simplifies FET selection and eliminates gate driver ICs or discrete level shifters. |
| Multi-mode operation | Automatically selects Burst Mode (light load), pulse-skipping, or forced continuous - maintains >85% efficiency from 1mA to 10A output. |
| Robust fault management | Independent SGEN/DGEN enables, TMR-based retry, and analog current/voltage sensing - enables fail-safe behavior in mission-critical avionics and military systems. |
Applications
| Industrial Power Supply | Automotive Infotainment |
|---|---|
Use Scenario: 24V/10A boost converter powering FPGA-based vision processing units in factory automation PLCs. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller with surge stopper and ideal diode - manages input transients from motor drives and ensures clean 48V rail during brownouts. Use Value: 55µA quiescent current extends standby runtime; 75V transient tolerance avoids external TVS; 2-phase interleaving reduces EMI filter size by 40%. |
Use Scenario: 12V-to-24V boost for LCD backlight and audio amplifier in automotive head units with cold-crank support. IC Role / Device Role / Timing Role: Input-protected boost controller - uses SGEN to disable surge stopper during 3V cold-crank while maintaining ideal diode reverse blocking. Use Value: –40V reverse input rating prevents damage from battery jump-start misconnections; programmable frequency avoids AM radio band interference. |
| Military Avionics | Telecom Remote Radio Unit |
Use Scenario: Ruggedized 28V-to-56V boost converter for radar front-end power in airborne communication systems. IC Role / Device Role / Timing Role: High-reliability polyphase boost controller with extended temperature range (–40°C to 125°C) - handles MIL-STD-704E voltage sags and spikes. Use Value: Dual independent current sense channels enable phase redundancy; TMR-based fault recovery meets DO-254 safety requirements. |
Use Scenario: 48V input boost to 57V for GaN PA bias in 5G small-cell remote radio heads. IC Role / Device Role / Timing Role: Precision-regulated boost controller - maintains stable 57V output as VIN drops from 57V to 36V during grid outage. Use Value: Output follows VIN up to 57V (no regulation needed above that point); 1.200V VFB reference ensures ±0.1% load regulation across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3897EUHF#TRPBF | Same silicon, rated for 0°C to 85°C junction temperature (vs. –40°C to 125°C for LTC3897IUHF#TRPBF) | Suitable for commercial-grade indoor equipment only; not qualified for automotive or industrial ambient extremes | Select when operating ambient stays below 70°C and cost sensitivity outweighs extended temp qualification |
| LTC3897HUHF#TRPBF | Same silicon, rated for –40°C to 150°C junction temperature; higher thermal limits on SG/DG outputs (16V max) | Required for under-hood automotive or high-temperature industrial enclosures where junction exceeds 125°C | Select when system-level thermal modeling predicts TJ > 125°C or when MIL-STD-810H temperature cycling compliance is mandatory |
Compared with LTC3897EUHF#TRPBF, the LTC3897IUHF#TRPBF offers guaranteed operation down to –40°C and up to 125°C - critical for outdoor telecom or vehicle-mounted systems - while LTC3897HUHF#TRPBF adds 25°C higher junction rating and enhanced gate drive robustness for extreme thermal environments.
Availability
LTC3897IUHF#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive infotainment systems, and military avionics requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC3897IUHF#TRPBF 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 defense markets.
The LTC3897 product line delivers highly integrated, rugged DC/DC controllers for harsh-environment power conversion - designed specifically for applications demanding wide input range, transient immunity, and multi-function protection in a single IC.
FAQ
What is the maximum input voltage transient the LTC3897IUHF#TRPBF can survive?
The LTC3897IUHF#TRPBF is rated to withstand input transients up to 75V, as specified in its Absolute Maximum Ratings table. This capability is enabled by its integrated surge stopper circuit, which actively clamps the input rail using an external N-MOSFET controlled by the SG pin. During such events, the device maintains regulation and protects downstream circuitry without latch-up or damage, provided the external MOSFET and layout meet recommended thermal and current handling guidelines.
How does the LTC3897IUHF#TRPBF implement reverse input protection?
The LTC3897IUHF#TRPBF implements reverse input protection via its integrated ideal diode controller, driven by the DG pin. When VIN goes negative (down to –40V), the controller turns off the external N-MOSFET connected between VIN and the system input, blocking reverse current flow. It regulates the forward voltage drop across the MOSFET to 20–40mV (ΔVSD), minimizing conduction loss compared to Schottky diodes. This function is independently enabled/disabled using the DGEN pin.
Can the LTC3897IUHF#TRPBF operate in single-phase mode?
Yes, the LTC3897IUHF#TRPBF can be configured for single-phase operation by connecting SENSE2+/– and TG2/BG2/SW2/BOOST2 to appropriate ground or no-connect states per the datasheet's "Single-Phase Operation" section. However, doing so forfeits the benefits of interleaved operation - including reduced input/output ripple, smaller passive components, and lower EMI - and disables phase synchronization features like CLKOUT daisy-chaining.
What is the purpose of the TMR pin on the LTC3897IUHF#TRPBF?
The TMR pin on the LTC3897IUHF#TRPBF serves as a multifunction timer node for fault management. It pulls up/down current during overvoltage (SPFB = 1.5V), overcurrent (ΔVIS ≥ 50mV), or warning conditions, enabling programmable retry intervals, fault latching, or external fault signaling. Its voltage thresholds (0.13V rising, 1.35V falling) and current sink/source characteristics allow designers to set custom delay times before automatic recovery or permanent shutdown.
Does the LTC3897IUHF#TRPBF require external bootstrap diodes for high-side gate driving?
No, the LTC3897IUHF#TRPBF does not require external bootstrap diodes. Its internal charge pump for BOOST1 and BOOST2 generates the floating gate drive voltage needed for the top N-MOSFETs (TG1/TG2), eliminating the need for discrete bootstrap components. This simplifies layout, improves reliability, and supports 100% duty cycle operation - a key advantage over traditional bootstrap-based controllers.
LTC3897IUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
LTC3897IUHF#TRPBF FAQ
1.How can I place an order for LTC3897IUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3897IUHF#TRPBF 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 LTC3897IUHF#TRPBF reliable?
The price and inventory of LTC3897IUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3897IUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3897IUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3897IUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3897IUHF#TRPBF?
LTC3897IUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3897IUHF#TRPBF 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 LTC3897IUHF#TRPBF?
For technical support, including LTC3897IUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3897IUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3897IUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3897IUHF#TRPBF 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 LTC3897IUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3897IUHF#TRPBF?
All LTC3897IUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3897IUHF#TRPBF, 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 LTC3897IUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3897IUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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