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Analog Devices Inc. LTC3897HFE#TRPBF
- Part No.:
- LTC3897HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3897HFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK BOOST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,668
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Product details
Overview
LTC3897HFE#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 2-phase interleaved operation, 55µA quiescent current in Burst Mode, and adjustable gate drive (5–10V) for logic- or standard-threshold MOSFETs - used in high-reliability industrial power supplies requiring input surge and reverse polarity protection.
For engineers reviewing the LTC3897HFE#TRPBF datasheet, LTC3897HFE#TRPBF pinout, LTC3897HFE#TRPBF application, or LTC3897HFE#TRPBF equivalent, key selection criteria include its –40V reverse input protection, 2-phase current sharing capability, programmable oscillator frequency (105–465 kHz), OPTI-DRIVE gate voltage control, and thermal-rated 150°C junction operation in the 38-lead TSSOP package.
Technical Context
The LTC3897HFE#TRPBF implements a two-phase interleaved synchronous boost architecture with out-of-phase gate timing to reduce input/output ripple and capacitor stress. Its surge stopper controls an external N-channel MOSFET via SG pin with adjustable overvoltage clamp (via SPFB), while the ideal diode controller drives a second N-channel MOSFET via DG pin to enforce forward conduction and block reverse current.
It integrates independent current-sense comparators per phase (SENSE1±/SENSE2±), programmable dead time (DTC), phase synchronization (PLLIN/MODE, CLKOUT), and dual LDOs - one for INTVCC (3.5V) and another for DRVCC (5–10V, selectable via DRVSET) - enabling robust gate drive under wide VIN and load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 65V continuous; withstands 75V transients - 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 strings, RF power amplifiers, or isolated bias supplies. |
| Quiescent Current | 55µA in Burst Mode - extends battery life in always-on systems with intermittent load demand. |
| Oscillator Frequency | 105–465 kHz (programmable via FREQ pin resistor or voltage) - balances efficiency, size, and EMI for compact magnetics design. |
| Gate Drive Voltage | 5V to 10V (OPTI-DRIVE, set by DRVSET) - ensures full enhancement of both logic-level and standard-threshold N-MOSFETs without external level shifters. |
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive, avionics, and harsh-environment industrial applications. |
| Reverse Input Protection | –40V - prevents damage from accidental battery reversal or negative transients in field-deployed equipment. |
Pinout & Package
The LTC3897HFE#TRPBF is housed in a thermally enhanced 38-lead plastic TSSOP package (FE) with exposed pad (Pin 39 = GND), θJA = 28°C/W. The package supports high-power density layouts with soldered GND pad for thermal and electrical integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 4.5–65V input; handles 75V transients - connects directly to unregulated system bus. |
| SG | Surge stopper gate driver output | Drives external N-MOSFET source to clamp input overvoltage and limit inrush - replaces discrete TVS + MOSFET circuits. |
| DG | Ideal diode gate driver output | Controls external N-MOSFET to replace Schottky diode - enables <30mV forward drop and zero reverse leakage. |
| TG1/TG2 | Top gate drivers (Phase 1 & 2) | Drive synchronous rectifier MOSFET gates - require BOOSTx bypass caps for floating high-side operation. |
| BG1/BG2 | Bottom gate drivers (Phase 1 & 2) | Drive main boost switch MOSFET gates - support >96% duty cycle for high step-up ratios. |
| SENSE1+/SENSE2+ | Current sense + inputs | Connect to high-side of current sense resistors - enable per-phase peak current limiting with 41–155mV threshold range. |
| VFB | Feedback reference input | Monitors output via resistive divider; regulates to 1.200V ±12mV - sets precise output voltage accuracy. |
| DRVSET | DRVCC regulation control | Selects 5V/6V/7V/9V/10V gate drive - matches MOSFET VGS(th) and RDS(on) for optimal efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved boost | Reduces input/output ripple current by ~70% vs single-phase - allows smaller capacitors and lower ESR requirements. |
| Integrated surge stopper | Replaces discrete overvoltage clamping circuitry - provides adjustable clamp voltage (via SPFB), inrush control, and output disconnect on fault. |
| Onboard ideal diode controller | Eliminates Schottky losses and thermal derating - achieves <30mV forward drop and blocks reverse current down to –40V input. |
| Programmable OPTI-DRIVE | Configures gate drive voltage from 5V to 10V - optimizes switching loss and conduction loss across diverse MOSFET families. |
| Low IQ Burst Mode | 55µA quiescent current at no load - maintains regulation during standby without external disable circuitry. |
| Thermal grade H | Guaranteed operation to 150°C junction - supports placement near hot components or in sealed enclosures without forced cooling. |
Applications
| Industrial Power Supply | Automotive Infotainment |
|---|---|
Use Scenario: 24V input-to-48V boost converter powering PoE++ midspans in factory automation cabinets. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller with surge stopper and ideal diode - manages input transients from motor drives and provides clean, regulated 48V output. Use Value: Eliminates need for external TVS arrays and Schottky OR-ing diodes; reduces board area by 35% versus discrete solutions. | Use Scenario: 12V battery-fed boost supply for LCD backlight and RF tuner modules in head units. IC Role / Device Role / Timing Role: High-efficiency boost controller with reverse polarity protection - sustains operation during jump-start events and battery reversal. Use Value: Withstands –40V reverse input and 75V load dump transients without latch-off or damage - meets ISO 16750-2 requirements. |
| Military Avionics | Railway Signaling |
Use Scenario: 28V aircraft bus-to-60V conversion for radar bias supplies in compact line-replaceable units. IC Role / Device Role / Timing Role: Two-phase boost controller with extended temperature rating - delivers stable output under vibration, altitude, and thermal cycling. Use Value: 150°C junction rating enables conduction-cooled designs; 2-phase interleaving lowers EMI to meet MIL-STD-461G CS114. | Use Scenario: 72V nominal traction battery-to-24V auxiliary supply in train control electronics. IC Role / Device Role / Timing Role: Surge-protected boost regulator with ideal diode input - handles 100V+ surges from regenerative braking and contact arcing. Use Value: Integrated surge stopper eliminates need for 100V+ TVS diodes; ideal diode prevents backfeed into failed modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3897HUHF#TRPBF | Same functionality and specs, but in 38-lead QFN (UHF) package with θJA = 34°C/W - higher thermal resistance than TSSOP FE variant. | Preferred for space-constrained PCBs where thermal vias can be added to exposed pad; less suitable for high-ambient, low-airflow environments. | Select when board layout favors QFN footprint and thermal management includes ≥6 thermal vias under exposed pad. |
| LTC3897IFE#TRPBF | Identical pinout and function, but rated for –40°C to 125°C junction - lacks 150°C qualification of H-grade part. | Suitable for commercial/industrial ambient conditions (<85°C), but not for under-hood or sealed avionics enclosures. | Choose only if system max junction temperature remains ≤125°C with margin; verify thermal simulation before substitution. |
Compared with LTC3897IFE#TRPBF and LTC3897HUHF#TRPBF, the LTC3897HFE#TRPBF uniquely combines 150°C operation with the lower thermal resistance (28°C/W) of the TSSOP package - making it the sole option for high-reliability, high-temperature applications requiring both extended junction rating and superior heat dissipation.
Availability
LTC3897HFE#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive infotainment systems, and military avionics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3897HFE#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 precision instrumentation, communications, and power management markets since 1965.
The LTC3897 product line delivers high-voltage, multi-phase synchronous controllers with integrated protection functions - designed specifically for ruggedized DC/DC conversion in automotive, aerospace, and industrial systems where reliability under voltage stress is critical.
FAQ
What is the maximum input voltage the LTC3897HFE#TRPBF can withstand without damage?
The LTC3897HFE#TRPBF has an absolute maximum input voltage rating of 76V on the VIN pin and can safely operate through transients up to 75V. Its surge stopper function actively clamps input overvoltage using the SG pin and external MOSFET, protecting downstream circuitry. This makes the LTC3897HFE#TRPBF suitable for 24V/48V systems exposed to load dump or inductive kickback events.
How does the LTC3897HFE#TRPBF implement reverse input protection?
The LTC3897HFE#TRPBF uses its integrated ideal diode controller (DG pin) to drive an external N-channel MOSFET in series with the input, blocking reverse current flow down to –40V. Unlike passive diodes, this active solution achieves <30mV forward voltage drop and zero reverse leakage - eliminating power loss and thermal issues associated with Schottky diodes. The LTC3897HFE#TRPBF monitors VCS–VIS+ to detect reverse polarity and immediately turns off the DG-driven MOSFET.
Can the LTC3897HFE#TRPBF operate in single-phase mode?
Yes, the LTC3897HFE#TRPBF supports single-phase operation by configuring PHASMD to tie one channel inactive - though its primary architecture is optimized for interleaved two-phase operation. Disabling Phase 2 reduces ripple cancellation benefits and increases input/output capacitor stress. The LTC3897HFE#TRPBF retains full surge stopper and ideal diode functionality regardless of phase configuration, and all control loops remain active for stability.
What is the purpose of the DRVSET pin on the LTC3897HFE#TRPBF?
The DRVSET pin on the LTC3897HFE#TRPBF programs the regulated output voltage of the internal DRVCC LDO, which powers the gate drivers. Tying DRVSET to GND sets DRVCC to 6.0V; to INTVCC sets it to 10.0V; and using a 50k–100kΩ resistor to GND enables intermediate voltages (e.g., 7.0V or 9.0V). This OPTI-DRIVE feature ensures optimal gate drive for diverse N-MOSFETs - minimizing switching loss while avoiding overvoltage stress on logic-level devices.
Does the LTC3897HFE#TRPBF require external bootstrap diodes for high-side gate drive?
No, the LTC3897HFE#TRPBF does not require external bootstrap diodes. Its integrated charge pump (BOOST1/BOOST2 pins) generates the floating gate drive voltage for the top N-MOSFETs (TG1/TG2) using internal circuitry and external BOOST-to-SW bypass capacitors. This eliminates discrete bootstrap components, reduces BOM count, and improves reliability - especially in high-duty-cycle or high-frequency applications where bootstrap capacitor recharge may be insufficient.
LTC3897HFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3897HFE#TRPBF FAQ
1.How can I place an order for LTC3897HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3897HFE#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 LTC3897HFE#TRPBF reliable?
The price and inventory of LTC3897HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3897HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3897HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3897HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3897HFE#TRPBF?
LTC3897HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3897HFE#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 LTC3897HFE#TRPBF?
For technical support, including LTC3897HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3897HFE#TRPBF requirements.
6.How does Aetrix verify that LTC3897HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3897HFE#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 LTC3897HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3897HFE#TRPBF?
All LTC3897HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3897HFE#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 LTC3897HFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3897HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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