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Analog Devices Inc. LTC3897HUHF#TRPBF
- Part No.:
- LTC3897HUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3897HUHF#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK BOOST 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,196
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Product details
Overview
LTC3897HUHF#TRPBF from Analog Devices is a dual-phase synchronous boost DC/DC controller with integrated surge stopper and ideal diode controller, designed for high-reliability 4.5V–65V input systems. It delivers up to 60V output, supports 2-phase interleaved operation (reducing input/output ripple and capacitor size), provides ±40V reverse input protection, and maintains 55µA quiescent current in Burst Mode-enabling robust power conversion in automotive front-end and industrial backup supplies.
For engineers reviewing the LTC3897HUHF#TRPBF datasheet, LTC3897HUHF#TRPBF pinout, LTC3897HUHF#TRPBF application, or LTC3897HUHF#TRPBF equivalent, key selection criteria include its dual-phase gate drive timing control (DTC-adjustable dead time), programmable DRVCC (5V–10V OPTI-DRIVE), 350kHz–535kHz fixed-frequency or resistor-programmable oscillator, and independent surge/ideal diode protection logic with adjustable clamp voltage via SPFB.
Technical Context
The LTC3897HUHF#TRPBF implements two out-of-phase synchronous boost channels with independent current-sense amplifiers (SENSE1±/SENSE2±), each supporting peak-current-mode control with selectable current limit thresholds (48mV/95mV/140mV via ILIM). Its surge stopper uses SG pin to drive an external N-channel MOSFET for input transient clamping up to 75V, while the ideal diode controller drives a second N-MOSFET via DG pin for reverse-voltage blocking and hold-up.
Phase synchronization is managed through PLLIN/MODE and CLKOUT pins, enabling multi-phase daisy-chaining; PHASMD configures phase offset between BG1/BG2 and CLKOUT. The error amplifier (ITH node) interfaces with VFB for output regulation, and SS enables soft-start via external capacitor-ensuring controlled startup under high-capacitance loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 75V continuous; withstands transients up to 75V-supports wide-range industrial and automotive battery inputs. |
| Output Voltage Range | Up to 60V regulated-enables high-voltage bias rails for sensors, RF modules, or LED drivers. |
| Quiescent Current | 55µA in Burst Mode-critical for always-on systems requiring ultra-low standby power. |
| Switching Frequency | 350kHz (FREQ = INTVCC) to 535kHz (FREQ = GND); resistor-programmable 105–465kHz-balances efficiency, EMI, and magnetics size. |
| Gate Drive Voltage | Programmable DRVCC: 5.0V–10.0V 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 load-dump-induced negative spikes. |
| Surge Clamp Accuracy | VSPFB = 1.235V ±30mV-sets precise overvoltage threshold for external MOSFET gate control during transients. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN with exposed thermal pad (Pin 39 = GND). Thermally enhanced for 150°C junction operation (H-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 4.2V–75V; bypassed to GND for noise suppression and transient energy absorption. |
| SG | Surge stopper gate driver output | Sinks/sourcing current to control external N-MOSFET for input overvoltage clamping and in-rush limiting. |
| DG | Ideal diode gate driver output | Drives N-MOSFET source-to-input for reverse polarity blocking and forward voltage regulation (ΔVSD = 30mV typ). |
| TG1/TG2 | Top gate drivers | Drive synchronous rectifier N-MOSFET gates; require BOOSTx–SWx bootstrap capacitors for high-side operation. |
| BG1/BG2 | Bottom gate drivers | Drive main boost switch N-MOSFET gates; operate with 96% max duty cycle and <100ns min on-time. |
| SENSE1+/SENSE2+ | Current sense positive inputs | Connect to high-side of sense resistors; supply bias current to internal comparators (250–350µA per pin). |
| CS | Current sense reference | Common return for surge/ideal diode current sensing; referenced by IS+, IS−, SPFB, and SG/DG circuitry. |
| SPFB | Surge protection feedback | Set point for VSPFB = 1.235V; determines clamp voltage threshold (VCLAMP = VCS + 1.235V × R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved boost architecture | Reduces input/output ripple by >70% vs single-phase, enabling smaller input/output capacitors and lower EMI filter cost. |
| Integrated surge stopper + ideal diode controller | Eliminates need for discrete TVS, Schottky diodes, and external gate drivers-reducing BOM count and PCB area. |
| OPTI-DRIVE gate voltage programming | DRVSET pin selects 5V/6V/7V/8V/9V/10V DRVCC-optimizes RDS(on) and switching loss across MOSFET VGS(th) spread. |
| Adjustable dead time control (DTC) | 60ns/100ns/200ns dead time selection prevents shoot-through in high-frequency, high-duty-cycle boost stages. |
| Multi-phase synchronization (CLKOUT/PLLIN) | Enables precise phase alignment across multiple LTC3897HUHF#TRPBF controllers for >20A scalable designs without external clock generators. |
| –40°C to 150°C guaranteed operation (H-grade) | Validated for under-hood automotive, avionics, and industrial environments where extended temperature reliability is mandatory. |
Applications
| Automotive Front-End Power Supply | Industrial Backup Power System |
|---|---|
|
Use Scenario: 12V/24V vehicle battery powers infotainment, ADAS, or telematics modules requiring stable 24V–48V rails despite cold-crank (–40V) and load-dump (75V) transients. IC Role / Device Role / Timing Role: LTC3897HUHF#TRPBF acts as primary boost controller and transient protector-regulating output while autonomously clamping surges and blocking reverse polarity. Use Value: Eliminates need for external TVS diodes and reverse-blocking MOSFET drivers, reducing solution size by 35% and improving system-level ASIL-B compliance. |
Use Scenario: Factory automation PLCs use supercapacitor-based hold-up to maintain operation during brief AC mains failure (10–100ms). IC Role / Device Role / Timing Role: LTC3897HUHF#TRPBF operates in ideal diode mode to charge supercaps from main supply, then seamlessly reverses conduction to sustain load during outage. Use Value: Achieves <30mV forward drop (vs 400mV Schottky), cutting hold-up losses by 85% and extending backup time by 2.3× at 5A load. |
| Ruggedized Test Equipment Power | Military Avionics DC-DC Conversion |
|
Use Scenario: Portable field testers must operate from 10V–36V batteries while surviving ESD, reverse connection, and 60V transients during probe contact. IC Role / Device Role / Timing Role: LTC3897HUHF#TRPBF serves as input conditioner and regulated boost stage-providing clean 24V/5A output with fault logging via TMR pin. Use Value: Integrated surge/ideal diode functions reduce component count by 12 parts versus discrete protection + boost controller solution. |
Use Scenario: Radar subsystems require 28V/15A from 27V aircraft bus, with immunity to MIL-STD-704F transients (±100V, 50ms) and –55°C to +125°C ambient. IC Role / Device Role / Timing Role: LTC3897HUHF#TRPBF operates in forced continuous mode with synchronized multi-phase scaling to meet ripple and thermal constraints. Use Value: H-grade QFN package and 150°C junction rating enable conduction-cooled mounting without derating-meeting DO-160 Section 22 thermal requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller with integrated protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3897IUHF#TRPBF | Same functionality and pinout; rated for –40°C to 125°C (I-grade), not 150°C. | Not suitable for under-hood automotive or high-ambient industrial enclosures exceeding 125°C junction. | Select only if ambient temperature and power dissipation ensure TJ ≤ 125°C; otherwise LTC3897HUHF#TRPBF is required. |
| LTC3897HUFD#TRPBF | Identical electrical specs and H-grade rating; packaged in 38-lead TSSOP (FE) instead of QFN (UHF). | TSSOP offers easier manual assembly and rework but has higher θJA (28°C/W vs 34°C/W), limiting high-power density layouts. | Choose UHF for thermally constrained PCBs; choose FE for prototyping, low-volume production, or legacy TSSOP-compatible footprints. |
Compared with LTC3897IUHF#TRPBF, the LTC3897HUHF#TRPBF guarantees full performance up to 150°C junction-critical for sustained operation in engine bay or sealed industrial enclosures. Versus LTC3897HUFD#TRPBF, the UHF QFN delivers superior thermal resistance for high-current, space-constrained designs despite identical silicon.
Availability
LTC3897HUHF#TRPBF is available at Aetrix Electronics and suitable for automotive front-end power supplies, industrial backup systems, and ruggedized test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC3897HUHF#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 LTC3897 product line delivers highly integrated, rugged DC/DC controllers for harsh-environment power conversion-designed specifically for automotive, aerospace, and industrial applications demanding wide input range, transient resilience, and extended temperature operation.
FAQ
What is the maximum input voltage the LTC3897HUHF#TRPBF can withstand during transients?
The LTC3897HUHF#TRPBF supports input transients up to 75V while maintaining functional operation, as specified in its Absolute Maximum Ratings. This capability enables reliable use in automotive load-dump scenarios and industrial power-line surges without external clamping components-provided the external MOSFETs and passive components are similarly rated.
How does the LTC3897HUHF#TRPBF implement reverse input protection?
The LTC3897HUHF#TRPBF implements reverse input protection via its integrated ideal diode controller, which drives an external N-channel MOSFET using the DG pin. When VIN goes negative, the controller regulates the MOSFET's source-drain voltage to ≤40mV (typ), blocking reverse current flow while maintaining low conduction loss-eliminating the need for a series Schottky diode and its associated 400mV forward drop.
Can the LTC3897HUHF#TRPBF operate with only one phase enabled?
Yes, the LTC3897HUHF#TRPBF supports single-phase operation by configuring PHASMD and disabling one channel's gate drive signals. However, its full benefit-interleaved ripple cancellation, reduced EMI, and optimized thermal distribution-is realized only in true 2-phase mode. Single-phase use retains all protection features but forfeits the input/output capacitor reduction advantage.
What is the purpose of the TMR pin on the LTC3897HUHF#TRPBF?
The TMR pin on the LTC3897HUHF#TRPBF serves as a multifunction timer interface: it pulls up/down during overvoltage or overcurrent faults to set retry delay, provides warning pulses before shutdown, and enables configurable fault response timing. Its voltage threshold (0.13V–1.38V) and current sink/source behavior allow precise customization of fault recovery behavior without external timers.
Does the LTC3897HUHF#TRPBF require external bootstrap diodes for high-side gate drive?
No, the LTC3897HUHF#TRPBF does not require external bootstrap diodes. Its internal charge pumps (BOOST1/SW1 and BOOST2/SW2) generate floating gate drive voltages for the top N-MOSFETs, eliminating external diodes and associated layout complexity-while maintaining robust start-up and high-duty-cycle operation across the full input range.
LTC3897HUHF#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3897HUHF#TRPBF FAQ
1.How can I place an order for LTC3897HUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3897HUHF#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 LTC3897HUHF#TRPBF reliable?
The price and inventory of LTC3897HUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3897HUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3897HUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3897HUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3897HUHF#TRPBF?
LTC3897HUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3897HUHF#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 LTC3897HUHF#TRPBF?
For technical support, including LTC3897HUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3897HUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3897HUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3897HUHF#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 LTC3897HUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3897HUHF#TRPBF?
All LTC3897HUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3897HUHF#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 LTC3897HUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3897HUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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