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Analog Devices Inc. LTC3897EUHF#TRPBF
- Part No.:
- LTC3897EUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3897EUHF#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK BOOST 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,076
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Product details
Overview
LTC3897EUHF#TRPBF from Analog Devices is a dual-phase synchronous boost DC/DC controller with integrated surge stopper and ideal diode controller. It drives two N-channel MOSFET stages out-of-phase (reducing input/output capacitance), provides ±40V reverse input protection, supports 4.5V–65V input (75V surge), delivers up to 60V output, and operates with 55µA quiescent current in Burst Mode - used in automotive front-end power supplies requiring transient robustness and reverse polarity immunity.
For engineers reviewing the LTC3897EUHF#TRPBF datasheet, LTC3897EUHF#TRPBF pinout, LTC3897EUHF#TRPBF application, or LTC3897EUHF#TRPBF equivalent, key selection criteria include dual-phase gate drive timing control (DTC pin), programmable DRVCC (5V–10V OPTI-DRIVE), adjustable overvoltage clamp via SPFB, and independent surge stopper/ideal diode enable logic (SGEN/DGEN).
Technical Context
The LTC3897EUHF#TRPBF implements a polyphase synchronous boost architecture with two independent current-mode control loops, each featuring programmable peak current sense thresholds (41mV/95mV/140mV via ILIM) and matched sensing (±9mV matching). Its surge stopper uses CS/IS+/IS−/SPFB pins to regulate input clamping voltage at 1.235V reference, while the ideal diode controller maintains ΔVSD = 30mV regulation between CS and IS+ under forward conduction.
Phase synchronization is managed via PLLIN/MODE and CLKOUT pins, supporting daisy-chained multi-phase operation; frequency is set by FREQ pin (320–585kHz fixed or 105–760kHz resistor-programmed) with dead time configurable via DTC (60ns/100ns/200ns). Gate drivers support bootstrap-free operation with internal charge pumps for BOOST1/BOOST2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 65V operating; withstands 75V transients - enables direct connection to 24V/48V industrial or automotive batteries without external TVS. |
| 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 vehicle ECU or telematics modules. |
| Reverse Input Protection | –40V tolerance with ideal diode controller - prevents damage during jump-start or battery reversal events. |
| Gate Drive Voltage | Programmable 5V–10V DRVCC (via DRVSET) - optimizes RDS(on) for logic-level or standard-threshold N-MOSFETs. |
| Switching Frequency | 320kHz–585kHz fixed or 105kHz–760kHz resistor-programmed - balances efficiency, size, and EMI in space-constrained designs. |
| Current Sense Threshold | Configurable 41mV/95mV/140mV (ILIM pin) - allows precise overcurrent protection scaling across load ranges. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN with exposed thermal pad (Pin 39 = GND). Thermal resistance θJA = 34°C/W. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply | Accepts 4.5V–75V; powers internal circuits and feeds boost stage - bypassed with ≥10µF ceramic capacitor. |
| CS | Surge stopper current sense reference | Common node for IS+/IS−; sets overcurrent trip point (ΔVIS = 50mV typ) and enables output disconnect. |
| SGEN / DGEN | Enable inputs for surge stopper / ideal diode | Logic-level enables (1.26V threshold); independent control allows selective activation of protection functions. |
| TG1 / TG2 | Top gate drivers | Drive gates of synchronous N-MOSFETs; support bootstrap-free operation via BOOST1/BOOST2 charge pumps. |
| BG1 / BG2 | Bottom gate drivers | Drive main N-MOSFETs; feature programmable dead time (60–200ns) via DTC pin to prevent shoot-through. |
| SPFB | Surge protection feedback | Regulates clamp voltage at 1.235V - sets maximum input-to-output differential during transients. |
| VFB | Output voltage feedback | 1.200V reference; connects to resistive divider on VOUT - enables precise output regulation (±0.1% load regulation). |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase synchronous boost | Reduces input/output ripple current by >70% vs single-phase - cuts required bulk capacitance by ~50% and eases EMI filtering. |
| Integrated surge stopper | Replaces discrete MOSFET + controller + comparator - provides adjustable overvoltage clamp, in-rush limiting, and output disconnect in one IC. |
| Ideal diode controller | Replaces Schottky diode with N-MOSFET - eliminates 0.3V–0.5V forward drop, reducing conduction loss and thermal stress at high currents. |
| OPTI-DRIVE gate voltage programming | DRVSET pin selects 5V/6V/7V/9V/10V DRVCC - matches gate drive to MOSFET VGS(th) for optimal switching loss vs conduction loss trade-off. |
| No external bootstrap diodes | Internal charge pumps supply BOOST1/BOOST2 - simplifies layout, improves reliability, and eliminates boot capacitor sizing uncertainty. |
Applications
| Automotive Front-End Power | Industrial 24V/48V Backup Supply |
|---|---|
Use Scenario: Power conversion in vehicle infotainment head units subjected to load dump (ISO 7637-2 Pulse 5a) and reverse battery connection. IC Role / Device Role / Timing Role: Dual-phase boost controller with integrated surge stopper and ideal diode - regulates stable 24V output from degraded 6V–16V battery during cranking. Use Value: Withstands –40V reverse input and 75V transients without external protection components; reduces board area by consolidating three protection functions. |
Use Scenario: Uninterruptible power supply for PLC I/O modules where mains failure triggers battery-backed boost to maintain 48V field bus voltage. IC Role / Device Role / Timing Role: Synchronous boost controller with hold-up capability - sustains output during brief AC dropout using ideal diode-controlled energy storage. Use Value: Ideal diode controller enables voltage holdup via external capacitor without Schottky leakage; 55µA quiescent current extends backup runtime. |
| Military Avionics Power Conditioning | High-Voltage Test Equipment Bias |
Use Scenario: Power management in airborne radar subsystems requiring MIL-STD-704F compliance (transient immunity up to ±75V). IC Role / Device Role / Timing Role: Polyphase boost controller with independent surge/ideal diode enables - manages input conditioning and output regulation in single-package solution. Use Value: Dual enable pins (SGEN/DGEN) allow phased startup and fault isolation; TSSOP/QFN packages qualified for –40°C to 125°C operation. |
Use Scenario: Generating 60V bias for semiconductor parameter analyzers where low noise and precise voltage regulation are critical. IC Role / Device Role / Timing Role: Precision boost controller with 0.1% load regulation and 1.200V VFB reference - maintains stable output under varying test loads. Use Value: Programmable frequency (105–760kHz) enables EMI optimization; matched current sense channels ensure balanced phase current sharing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3895IUHF#TRPBF | Single-phase only; no integrated surge stopper or ideal diode; 4.5V–60V input; 55µA IQ. | Suitable for cost-sensitive, lower-power boost where external protection is acceptable. | Select when dual-phase operation and integrated protection are unnecessary - saves BOM count but requires external MOSFET drivers and protection circuitry. |
| LM5122MH/NOPB | Single-phase synchronous boost; 3V–65V input; no surge stopper or ideal diode; 100µA IQ; 50kHz–750kHz programmable frequency. | Targeted at general-purpose industrial boost where TI's ecosystem and WEBENCH support are preferred. | Choose for simpler designs needing TI's design tools; lacks reverse input protection and dual-phase interleaving - requires external solutions for those features. |
Compared with LTC3895IUHF#TRPBF and LM5122MH/NOPB, the LTC3897EUHF#TRPBF uniquely integrates dual-phase control, surge stopper, and ideal diode in one package - eliminating 3–5 discrete components and enabling compact, high-reliability front-end power for harsh environments.
Availability
LTC3897EUHF#TRPBF is available at Aetrix Electronics and suitable for automotive front-end power, industrial 24V/48V backup supplies, and military avionics requiring stable component supply, long-term lifecycle assurance, and guaranteed temperature-grade traceability.
Supply support for LTC3897EUHF#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 industrial markets since 1965.
The LTC3897EUHF#TRPBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC controllers, designed specifically for robust power conversion in automotive, aerospace, and industrial systems facing extreme voltage transients and reverse polarity conditions.
FAQ
What is the maximum input voltage the LTC3897EUHF#TRPBF can withstand during transients?
The LTC3897EUHF#TRPBF supports continuous operation from 4.5V to 65V and is rated to withstand input transients up to 75V without damage or latch-up. This rating is validated per Absolute Maximum Ratings (VIN ≤ 76V) and confirmed in typical application circuits where VIN operates through transients up to 75V. The surge stopper function remains active throughout this range to clamp and protect downstream circuitry.
Does the LTC3897EUHF#TRPBF require external bootstrap diodes for high-side gate drive?
No, the LTC3897EUHF#TRPBF does not require external bootstrap diodes. It integrates charge pumps for BOOST1 and BOOST2 pins that autonomously generate floating gate drive voltages for the top N-channel MOSFETs. This eliminates external diodes and associated capacitors, simplifying layout and improving reliability in high-density power designs.
How is reverse input protection implemented in the LTC3897EUHF#TRPBF?
Reverse input protection in the LTC3897EUHF#TRPBF is implemented via its integrated ideal diode controller, which drives an external N-channel MOSFET between VIN and the system input. The controller regulates the source-drain voltage (ΔVSD) to 30mV typical, blocking reverse current flow while minimizing forward conduction loss - enabling robust –40V reverse input tolerance without Schottky diode losses.
Can the LTC3897EUHF#TRPBF operate in single-phase mode?
Yes, the LTC3897EUHF#TRPBF can be configured for single-phase operation by connecting PHASMD to GND or INTVCC to fix phase alignment, disabling CLKOUT synchronization, and using only one channel (e.g., TG1/BG1/SENSE1+/SENSE1–). The second channel remains functional but may be left unused - retaining full surge stopper and ideal diode functionality regardless of phase configuration.
What is the purpose of the SPFB pin on the LTC3897EUHF#TRPBF?
The SPFB (Surge Protection Feedback) pin on the LTC3897EUHF#TRPBF sets the regulated clamp voltage for the integrated surge stopper. It references an internal 1.235V bandgap; connecting a resistor divider from VIN to GND to SPFB determines the input overvoltage threshold (e.g., 36V clamp with 28.7kΩ/10kΩ divider). This enables precise, adjustable transient protection without external op-amps or comparators.
LTC3897EUHF#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)
LTC3897EUHF#TRPBF FAQ
1.How can I place an order for LTC3897EUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3897EUHF#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 LTC3897EUHF#TRPBF reliable?
The price and inventory of LTC3897EUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3897EUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3897EUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3897EUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3897EUHF#TRPBF?
LTC3897EUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3897EUHF#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 LTC3897EUHF#TRPBF?
For technical support, including LTC3897EUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3897EUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3897EUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3897EUHF#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 LTC3897EUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3897EUHF#TRPBF?
All LTC3897EUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3897EUHF#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 LTC3897EUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3897EUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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