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Analog Devices Inc. LTC3897IFE#TRPBF
- Part No.:
- LTC3897IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3897IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK BOOST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,626
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Product details
Overview
LTC3897IFE#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, supports 2-phase interleaved operation to reduce ripple and capacitor size, and features 55µA quiescent current in Burst Mode. It is used in high-reliability 24V/10A industrial power supplies requiring input surge protection and reverse polarity blocking.
For engineers reviewing the LTC3897IFE#TRPBF datasheet, LTC3897IFE#TRPBF pinout, LTC3897IFE#TRPBF application, or LTC3897IFE#TRPBF 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, adjustable 320–585kHz switching frequency, OPTI-DRIVE gate voltage programming (5–10V), and −40V reverse input protection capability.
Technical Context
The LTC3897IFE#TRPBF implements a polyphase synchronous boost topology with two out-of-phase N-channel FET drive channels (TG1/BG1 and TG2/BG2), reducing input/output ripple and enabling smaller magnetics. Its surge stopper circuit controls an external N-MOSFET via SG pin to clamp transients up to 75V and provide in-rush limiting, overcurrent shutdown, and output disconnect.
The integrated ideal diode controller drives a second external N-MOSFET via DG pin to replace Schottky diodes, enforcing forward voltage regulation (20–40mV) and blocking reverse current down to −40V. Both controllers operate independently but share common bias (VBIAS), feedback (VFB), and soft-start (SS) resources.
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 buses with lightning/surge immunity. |
| Output Voltage Range | Up to 60V regulated - supports high-voltage auxiliary rails for sensors, actuators, or RF modules without external post-regulation. |
| Quiescent Current | 55µA in Burst Mode - extends battery life in always-on automotive or remote monitoring systems. |
| Switching Frequency | 320–585kHz fixed or 105–465kHz programmable - balances efficiency, EMI, and inductor size for compact designs. |
| Gate Drive Voltage | 5V to 10V (OPTI-DRIVE) - supports both logic-level and standard-threshold N-MOSFETs without external level shifters. |
| Reverse Input Protection | −40V rated - prevents damage from accidental battery reversal or negative supply faults in vehicle or avionics systems. |
| Current Sense Threshold | 41–155mV (selectable via ILIM pin) - allows precise overcurrent detection across wide load ranges with minimal sense resistor loss. |
Pinout & Package
The LTC3897IFE#TRPBF is housed in a thermally enhanced 38-lead plastic TSSOP package (FE package) with exposed pad (Pin 39) soldered to PCB ground for thermal management (θJA = 28°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Boost converter input supply | Accepts 4.5–65V input; clamped to 75V transient tolerance - connects directly to unregulated bus with no pre-filtering required. |
| TG1, TG2 | Top gate drivers | Drive gates of synchronous N-MOSFETs; support 5–10V OPTI-DRIVE - eliminates need for bootstrap diodes or external charge pumps. |
| BG1, BG2 | Bottom gate drivers | Drive main N-MOSFETs in each phase; 96% max duty cycle - enables high step-up ratios while maintaining safe dead time. |
| SG | Surge stopper gate driver | Controls external N-MOSFET for input transient clamping and in-rush limiting - provides programmable overvoltage/overcurrent fault response. |
| DG | Ideal diode gate driver | Drives N-MOSFET to replace Schottky diode; regulates forward drop to 20–40mV - reduces conduction loss by >50% vs. discrete diode solutions. |
| SENSE1+/SENSE1−, SENSE2+/SENSE2− | Per-phase current sense inputs | Differential inputs for precision current sensing; ±10µA input bias - enables accurate peak-current-mode control with low-value sense resistors. |
| VFB | Feedback reference input | 1.200V ±12mV regulated reference - sets output voltage via external resistor divider; supports remote sensing for tight regulation. |
| ILIM | Current limit threshold select | Three-state pin (GND/float/INTVCC) selects 48/95/140mV sense threshold - simplifies design for varying current protection levels without component changes. |
Key Features
| Feature | Design Value |
|---|---|
| 2-Phase Interleaved Boost Control | Reduces input/output ripple by >70% vs. single-phase, allowing 50% smaller capacitors and lower EMI filter cost. |
| Integrated Surge Stopper | Replaces discrete transient voltage suppressors and current-limit ICs - eliminates 4–6 external components per channel. |
| Onboard Ideal Diode Controller | Enables <10mΩ effective forward resistance with active reverse current blocking - improves efficiency by 3–5% at 10A loads. |
| Programmable Gate Drive (OPTI-DRIVE) | Single-pin (DRVSET) adjustment of DRVCC from 5V to 10V - ensures optimal RDS(on) utilization across MOSFET families. |
| No External Bootstrap Diodes Required | Internal charge pump with BOOST/SW pins self-generates gate drive voltage - removes reliability risk of failed bootstrap diodes in high-temp environments. |
Applications
| Industrial Power Supplies | Automotive Infotainment Systems |
|---|---|
Use Scenario: 24V input-to-48V output boost converter powering PoE++ switches in factory automation cabinets. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller with integrated surge stopper and ideal diode - manages high-efficiency voltage step-up while protecting against 48V bus transients and reverse polarity events. Use Value: Eliminates need for external TVS arrays and Schottky OR-ing diodes, reducing BOM count by 7 parts and improving system MTBF by >30%. | Use Scenario: 12V battery-powered head unit requiring stable 24V rail for display backlight and audio amplifiers during cold-crank (4.5V min). IC Role / Device Role / Timing Role: Polyphase boost controller with ultra-low 55µA quiescent current and 75V transient tolerance - sustains operation through engine start while surviving jump-start surges. Use Value: Maintains 24V output regulation down to 4.5V input, avoiding brownout resets; 55µA sleep current extends battery hold-up time to >72 hours. |
| Military Avionics Power Modules | Railway Signaling Equipment |
Use Scenario: 28V aircraft bus interface supplying 60V for radar sensor biasing, with −40V reverse polarity survivability. IC Role / Device Role / Timing Role: Synchronous boost controller with −40V reverse input protection and 150°C-rated H-grade option - ensures uninterrupted operation under extreme environmental stress. Use Value: Replaces legacy discrete boost + ideal diode + surge protection solution, cutting board area by 45% and passing MIL-STD-704F reverse polarity testing. | Use Scenario: 72V DC traction power feeding 24V control logic in wayside signaling boxes exposed to lightning-induced transients. IC Role / Device Role / Timing Role: Dual-phase boost controller with 75V transient clamping and programmable overcurrent response - absorbs 10kV/10A lightning surges without latch-up. Use Value: Reduces surge protection component count from 12 (TVS, MOV, crowbar) to 2 (external N-MOSFET + RC snubber), lowering failure rate in coastal installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3897IUHF#TRPBF | Same functionality and pinout; QFN package (5mm × 7mm) with θJA = 34°C/W vs. TSSOP's 28°C/W. | Better thermal performance in space-constrained layouts; requires different PCB footprint and reflow profile. | Select for higher power density designs where board area is limited and thermal vias can be implemented. |
| LTC3897HFE#TRPBF | Identical TSSOP package; extended junction temperature rating (–40°C to 150°C) vs. IFE's –40°C to 125°C. | Required for under-hood automotive or enclosed industrial enclosures exceeding 125°C ambient. | Choose when operating junction temperature exceeds 125°C; no layout change needed versus IFE grade. |
Compared with LTC3897IFE#TRPBF, the IUHF variant offers superior thermal dissipation in compact footprints but requires PCB redesign, while the HFE variant maintains identical layout compatibility while enabling operation at higher ambient temperatures - making HFE the drop-in upgrade for thermal-limited deployments.
Availability
LTC3897IFE#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive infotainment systems, and military avionics requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3897IFE#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 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 polyphase DC/DC controllers targeting high-reliability power conversion in harsh environments - specifically engineered for applications demanding wide input range, robust fault protection, and minimal external component count.
FAQ
What is the maximum input voltage transient the LTC3897IFE#TRPBF can survive?
The LTC3897IFE#TRPBF is rated to withstand input transients up to 75V on the VIN pin, as specified in its Absolute Maximum Ratings table. This capability is enabled by its integrated surge stopper function, which actively clamps transients using an external N-MOSFET controlled via the SG pin. The device continues normal operation after transient clearance without latch-up or reset, provided the 75V limit is not exceeded.
Does the LTC3897IFE#TRPBF require external bootstrap diodes for high-side gate drive?
No, the LTC3897IFE#TRPBF does not require external bootstrap diodes. It integrates internal charge pumps for the TG1 and TG2 high-side gate drivers, powered from the BOOST1/SW1 and BOOST2/SW2 nodes respectively. These charge pumps generate the necessary floating gate drive voltage above the switch node, eliminating reliability concerns associated with discrete bootstrap diodes in high-temperature or high-vibration environments.
How does the ILIM pin affect current limiting on the LTC3897IFE#TRPBF?
The ILIM pin on the LTC3897IFE#TRPBF selects one of three peak current sense thresholds: 48mV (ILIM = GND), 95mV (ILIM = float), or 140mV (ILIM = INTVCC). This directly sets the voltage across the sense resistor at which the current comparator trips and terminates the switch cycle. The selection determines full-scale current limit without changing sense resistor values, enabling flexible overcurrent protection tuning across different load profiles.
Can the LTC3897IFE#TRPBF be synchronized to an external clock?
Yes, the LTC3897IFE#TRPBF supports external synchronization via the PLLIN/MODE pin. When configured as a clock input (driven by a CMOS-level signal between 75kHz and 850kHz), it locks the internal oscillator to the external frequency and phase, enabling precise multi-phase interleaving across multiple LTC3897 devices. This eliminates beat frequencies and reduces input/output ripple in systems with multiple parallel converters.
What is the purpose of the DTC pin on the LTC3897IFE#TRPBF?
The DTC (Dead Time Control) pin on the LTC3897IFE#TRPBF sets the minimum off-time between top-gate (TG) turn-off and bottom-gate (BG) turn-on to prevent shoot-through. It offers three settings: 60ns (DTC = GND), 100ns (DTC = float), or 200ns (DTC = INTVCC). This adjustment optimizes efficiency and thermal performance based on MOSFET gate charge characteristics and layout parasitics, particularly critical in high-frequency or high-current designs.
LTC3897IFE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3897IFE#TRPBF FAQ
1.How can I place an order for LTC3897IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3897IFE#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 LTC3897IFE#TRPBF reliable?
The price and inventory of LTC3897IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3897IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3897IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3897IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3897IFE#TRPBF?
LTC3897IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3897IFE#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 LTC3897IFE#TRPBF?
For technical support, including LTC3897IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3897IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3897IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3897IFE#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 LTC3897IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3897IFE#TRPBF?
All LTC3897IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3897IFE#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 LTC3897IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3897IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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