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Analog Devices Inc. LTC3897EUHF#PBF
- Part No.:
- LTC3897EUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3897EUHF#PBF.pdf
- Description:
- IC REG CTRLR BUCK BOOST 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:130
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Product details
Overview
LTC3897EUHF#PBF 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, supports 4.5V–65V input (75V surge), delivers up to 60V output, and enables reverse input protection to –40V - used in automotive front-end power supplies requiring high transient immunity and holdup.
For engineers reviewing the LTC3897EUHF#PBF datasheet, LTC3897EUHF#PBF pinout, LTC3897EUHF#PBF application, or LTC3897EUHF#PBF equivalent, key selection considerations include its 2-phase current-mode control, programmable gate drive (5V–10V OPTI-DRIVE), adjustable surge clamp voltage, low 55µA Burst Mode quiescent current, and dual independent current sense inputs for phase balancing.
Technical Context
The LTC3897EUHF#PBF implements a polyphase current-mode boost architecture with two independent error amplifiers and current comparators per channel, enabling precise interleaved operation. Its internal VCO supports fixed (350kHz/535kHz) or resistor-programmed switching frequencies from 105kHz to 760kHz, with external synchronization capability via PLLIN/MODE.
It integrates three functional blocks: (1) a 2-phase synchronous boost controller with OPTI-DRIVE gate voltage programming and dead-time control (DTC); (2) a surge stopper controlling an external N-MOSFET via SG pin for input overvoltage/in-rush/overcurrent protection; and (3) an ideal diode controller driving another N-MOSFET via DG pin for reverse polarity protection and voltage holdup with 20–40mV forward regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 65V operating; withstands transients up to 75V - 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 drivers, RF power amplifiers, or industrial sensors requiring boosted supply. |
| Quiescent Current | 55µA in Burst Mode - extends battery life in always-on systems such as telematics or remote monitoring. |
| Switching Frequency | Programmable 105kHz–760kHz or fixed 350kHz/535kHz - allows optimization of size (inductor/capacitor) vs EMI performance. |
| Gate Drive Voltage | Adjustable 5V–10V via DRVSET - supports both logic-level and standard-threshold N-MOSFETs without external level shifters. |
| Reverse Input Protection | Withstands –40V - eliminates need for external series diodes or TVS in reverse-polarity-prone environments like vehicle jump-start scenarios. |
| Current Sense Threshold | Configurable 41mV/95mV/140mV via ILIM pin - enables accurate current limiting across wide load ranges with minimal sensing loss. |
Pinout & Package
The LTC3897EUHF#PBF is housed in a thermally enhanced 38-pin (5mm × 7mm) leadless QFN package with exposed thermal pad (Pin 39 = GND). The package provides θJA = 34°C/W and requires soldering of the exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply rail | Accepts 4.5V–75V; powers internal bias circuits and feeds boost stage input - must be bypassed with low-ESR capacitor. |
| SG | Surge stopper gate driver output | Drives external N-MOSFET source follower for input overvoltage clamping, in-rush control, and output disconnect - open-drain with pull-up/pull-down current specs. |
| DG | Ideal diode gate driver output | Controls external N-MOSFET for reverse input protection and holdup - regulates forward voltage drop to 20–40mV and blocks reverse current. |
| TG1/TG2 | Top gate drivers for synchronous rectification | Drive gates of high-side N-MOSFETs in each boost phase; support 5V–10V OPTI-DRIVE; require BOOSTx bootstrap capacitors. |
| BG1/BG2 | Bottom gate drivers for main switches | Drive gates of low-side N-MOSFETs; feature programmable dead time (60ns/100ns/200ns) via DTC pin to prevent shoot-through. |
| SENSE1+/SENSE1− SENSE2+/SENSE2− | Dual-channel current sense inputs | Measure inductor current per phase with ±0.3V common-mode range; enable interleaved current balancing and cycle-by-cycle peak current limiting. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved boost control | Reduces input/output ripple current by ~70% vs single-phase, allowing smaller input/output capacitors and lower EMI filtering cost. |
| Integrated surge stopper | Replaces discrete overvoltage protection ICs; provides adjustable clamp voltage, in-rush limiting, and automatic output disconnect on fault. |
| Onboard ideal diode controller | Eliminates Schottky losses and thermal derating; enables <10mΩ effective forward resistance and zero reverse leakage at –40V. |
| OPTI-DRIVE gate voltage programming | Single-pin (DRVSET) configuration of 5V–10V gate drive ensures optimal RDS(on) utilization across logic- and standard-threshold MOSFETs. |
| Programmable dead time | DTC pin selects 60ns/100ns/200ns between top/bottom gate transitions - prevents cross-conduction while maintaining efficiency across FET types. |
Applications
| Automotive Front-End Power | Industrial 48V Backup Supply |
|---|---|
Use Scenario: 24V vehicle battery subjected to load dump (up to 60V) and reverse polarity during jump-start. IC Role / Device Role / Timing Role: LTC3897EUHF#PBF acts as primary boost controller and input protector - regulating 24V→48V while clamping surges and blocking reverse current. Use Value: Enables single-chip solution replacing discrete surge suppressor + ideal diode + dual-phase controller - reduces BOM count by ≥7 components and PCB area by 35%. | Use Scenario: Factory automation PLC requiring uninterrupted 48V supply during AC mains failure, with >10ms holdup time. IC Role / Device Role / Timing Role: LTC3897EUHF#PBF controls two parallel boost stages feeding supercapacitor bank, using ideal diode mode for seamless switchover. Use Value: Achieves 92% efficiency at 10A while delivering 12ms holdup via controlled MOSFET conduction - avoids costly backup battery management circuitry. |
| Military Avionics Power Conditioning | High-Voltage Test Equipment |
Use Scenario: Ruggedized airborne radio system powered from 28V aircraft bus with MIL-STD-704F transients (±100V spikes). IC Role / Device Role / Timing Role: LTC3897EUHF#PBF serves as hardened input stage - suppressing transients via SG-controlled MOSFET and regulating 28V→56V for RF PA bias. Use Value: Meets DO-160 Section 16 Level 3 surge immunity without external TVS arrays - simplifies qualification testing and improves long-term reliability. | Use Scenario: Portable calibration source needing stable 60V output from variable 12–36V Li-ion pack under varying temperature and load. IC Role / Device Role / Timing Role: LTC3897EUHF#PBF operates in forced continuous mode with precision VFB regulation (±1.2mV) and low tempco (±0.01%/°C). Use Value: Delivers 60V ±0.05% over –40°C to +125°C with no external trimming - eliminates need for post-regulation DAC-based correction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3895EUFD#PBF | Single-phase only; no integrated surge stopper or ideal diode controller; 4.5V–60V input; 55µA IQ. | Suitable for space-constrained designs where surge/reverse protection is handled externally or unnecessary. | Select when cost sensitivity outweighs integration benefits and system already includes discrete protection. |
| LM5122MH/NOPB | Single-phase controller; no surge stopper; no ideal diode; 3V–65V input; 100µA IQ; requires external bootstrap diodes. | Used in cost-optimized industrial converters where external protection and higher IQ are acceptable. | Choose for TI ecosystem compatibility or when leveraging existing LM5122 reference designs with minimal redesign. |
Compared with LTC3895EUFD#PBF and LM5122MH/NOPB, the LTC3897EUHF#PBF uniquely integrates dual-phase control, surge suppression, and ideal diode functionality - reducing total solution size by 40% and eliminating six external protection components while maintaining 55µA quiescent current.
Availability
LTC3897EUHF#PBF is available at Aetrix Electronics and suitable for automotive front-end power, industrial 48V backup supply, and military avionics power conditioning requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for LTC3897EUHF#PBF 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 LTC3897EUHF#PBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC controllers, designed specifically for robust, high-efficiency power conversion in harsh environments with wide input transients and stringent reliability requirements.
FAQ
What is the maximum input voltage the LTC3897EUHF#PBF can withstand without damage?
The LTC3897EUHF#PBF has an absolute maximum VIN rating of 76V and is specified to operate continuously up to 65V. It reliably withstands input transients up to 75V - validated per typical application circuits and absolute maximum ratings tables. This makes the LTC3897EUHF#PBF suitable for automotive load-dump conditions and industrial 48V rail surges without external clamping.
Does the LTC3897EUHF#PBF support synchronization to an external clock?
Yes, the LTC3897EUHF#PBF supports external clock synchronization via the PLLIN/MODE pin, accepting input frequencies from 75kHz to 850kHz. When configured for sync mode, it locks phase and frequency to the external source - enabling precise multi-phase interleaving across multiple LTC3897EUHF#PBF units in high-current systems.
How does the ideal diode function of the LTC3897EUHF#PBF protect against reverse input voltage?
The LTC3897EUHF#PBF's ideal diode controller drives an external N-MOSFET via the DG pin to regulate forward voltage drop to 20–40mV and block reverse current flow. When VIN goes negative (down to –40V), the DG output shuts off the MOSFET, preventing reverse conduction - eliminating power loss and heat generation associated with Schottky diodes.
Can the LTC3897EUHF#PBF operate with only one phase enabled?
Yes, the LTC3897EUHF#PBF supports single-phase operation by configuring PHASMD to tie one channel inactive (e.g., grounding PHASMD disables Phase 2). Both SENSE1+/– and SENSE2+/– remain functional, but only the active phase contributes to regulation - useful for lower-power derivatives or redundancy schemes.
What is the purpose of the EXTVCC pin on the LTC3897EUHF#PBF?
The EXTVCC pin on the LTC3897EUHF#PBF provides an alternative input to the internal DRVCC LDO regulator. When EXTVCC exceeds its switchover threshold (4.7V or 7.7V depending on DRVUV state), it powers DRVCC instead of VBIAS - improving efficiency in systems where a clean, lower-voltage auxiliary rail is available for gate drive.
LTC3897EUHF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3897EUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3897EUHF#PBF 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#PBF reliable?
The price and inventory of LTC3897EUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3897EUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3897EUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3897EUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3897EUHF#PBF?
LTC3897EUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3897EUHF#PBF 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#PBF?
For technical support, including LTC3897EUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3897EUHF#PBF requirements.
6.How does Aetrix verify that LTC3897EUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3897EUHF#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3897EUHF#PBF?
All LTC3897EUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3897EUHF#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3897EUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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