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Analog Devices Inc. LTC3897IUHF#PBF
- Part No.:
- LTC3897IUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3897IUHF#PBF.pdf
- Description:
- IC REG CTRLR BUCK BOOST 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,261
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Product details
Overview
LTC3897IUHF#PBF from Analog Devices is a dual-phase synchronous boost DC/DC controller with integrated surge stopper and ideal diode controller, operating from 4.5V to 65V input (75V surge tolerant), delivering up to 60V output with 55µA quiescent current in Burst Mode and supporting 2-phase interleaved operation for reduced ripple and capacitor size. It is used in high-reliability 24V/10A industrial power supplies requiring reverse input protection, in-rush control, and transient immunity.
For engineers reviewing the LTC3897IUHF#PBF datasheet, LTC3897IUHF#PBF pinout, LTC3897IUHF#PBF application, or LTC3897IUHF#PBF equivalent, key selection considerations include its dual-phase gate drive timing (adjustable dead time via DTC pin), programmable DRVCC (5V–10V OPTI-DRIVE), 38-pin QFN thermal performance (θJA = 34°C/W), and integrated protection functions (surge clamp, overcurrent, reverse voltage holdup).
Technical Context
The LTC3897IUHF#PBF implements a two-phase interleaved synchronous boost architecture with out-of-phase TG1/BG1 and TG2/BG2 switching to reduce input/output ripple and capacitor stress. Its error amplifier (gm = 2 mmho) servo-controls VFB at 1.200V ±12mV while ITH modulates peak current limit across both phases.
Surge protection is implemented via an external N-MOSFET driven by the SG pin, with adjustable overvoltage threshold (SPFB = 1.235V ±30mV) and overcurrent detection (ΔVIS = 50mV ±5mV). The ideal diode function uses DG-driven N-MOSFET with source-drain regulation at 30mV ±10mV and sub-2µs fault turn-off propagation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 65V continuous; withstands 75V transients - enables direct connection to automotive battery, industrial 48V rails, and unregulated HV inputs. |
| Output Voltage Range | Up to 60V regulated - supports high-voltage bias rails for amplifiers, sensors, and RF modules without external post-regulation. |
| Quiescent Current | 55µA in Burst Mode - extends battery life in always-on systems such as telematics and remote monitoring. |
| Switching Frequency | Programmable 105kHz to 465kHz (via RFREQ) or fixed 350kHz/535kHz - allows optimization of efficiency vs. size for inductor and capacitor selection. |
| Gate Drive Level | Adjustable 5V to 10V (OPTI-DRIVE via DRVSET) - supports both logic-level and standard-threshold N-MOSFETs without external level shifters. |
| Protection Functions | Integrated surge stopper (adjustable clamp), ideal diode (reverse input to –40V), in-rush control, overcurrent, and output disconnect - eliminates need for discrete protection ICs or Schottky diodes. |
| Package | 38-pin 5mm × 7mm QFN with exposed thermal pad - provides low θJA = 34°C/W for high-power density designs in space-constrained enclosures. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN with exposed GND pad (Pin 39), rated for –40°C to 125°C junction temperature and θJA = 34°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 4.5V–65V input; handles 75V surges - connects directly to battery or unregulated DC bus. |
| TG1, TG2 | Top gate drivers | Drive gates of high-side synchronous N-MOSFETs; support 10V max gate drive with programmable DRVCC. |
| BG1, BG2 | Bottom gate drivers | Drive gates of low-side main N-MOSFETs; feature 96% max duty cycle and <100ns min on-time. |
| SG | Surge stopper gate driver | Controls external N-MOSFET for input overvoltage clamping and in-rush limiting - responds within µs to transients. |
| DG | Ideal diode gate driver | Drives N-MOSFET to replace Schottky diode; regulates forward drop to ~30mV and blocks reverse current down to –40V. |
| SENSE1+, SENSE1– SENSE2+, SENSE2– |
Current sense inputs (dual channel) | Measure inductor current per phase; support 41mV–155mV programmable threshold (ILIM pin selectable) for accurate peak-current mode control. |
| VFB | Feedback reference input | Regulates output to 1.200V ±12mV; used with external resistor divider to set precise output voltage up to 60V. |
| DRVSET | DRVCC voltage programming | Sets gate driver LDO output to 5.0V, 6.0V, 7.0V, 7.6V, or 9.0V - enables optimal Rds(on) utilization across MOSFET Vgs thresholds. |
| DTC | Dead time control | Selects 60ns / 100ns / 200ns between top/bottom gate transitions - prevents shoot-through in high-frequency, high-duty-cycle operation. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved boost control | Reduces input/output ripple by >70% vs single-phase, enabling smaller bulk capacitors and lower EMI filter complexity. |
| Integrated surge stopper | Replaces discrete TVS + MOSFET controllers; supports adjustable clamp voltage and automatic retry after overvoltage events. |
| Onboard ideal diode controller | Eliminates Schottky losses (typ. 0.3V drop) and enables reverse input protection to –40V with <30mV forward regulation. |
| OPTI-DRIVE gate voltage programming | Configures DRVCC from 5V to 10V using single resistor - ensures full enhancement of diverse N-MOSFETs without external regulators. |
| No external bootstrap diodes required | Integrated charge pumps for BOOST1/BOOST2 pins - simplifies layout and improves reliability in high-density power stages. |
Applications
| Automotive Infotainment Power Supply | Industrial 24V Rail Booster |
|---|---|
|
Use Scenario: Boosting unstable vehicle battery (6V–16V) to stable 24V for display backlighting and audio amplifiers during cold-crank and load-dump events. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller with integrated surge stopper and ideal diode - manages input transients up to 75V and blocks reverse battery connection. Use Value: Eliminates need for external TVS, Schottky diodes, and discrete current-limit circuits; achieves >92% efficiency at 10A while maintaining <55µA quiescent draw in standby. |
Use Scenario: Generating 48V from 24V factory automation bus to power PoE++ switches and high-speed I/O modules. IC Role / Device Role / Timing Role: Interleaved boost controller with programmable frequency (105–465kHz) and phase synchronization (CLKOUT) - enables multi-phase stacking for >20A output. Use Value: Reduces input capacitor count by 50% vs single-phase design; supports seamless daisy-chaining of up to 6 phases for scalable power delivery. |
| Military Avionics Hold-Up Supply | Ruggedized Telematics Gateway |
|
Use Scenario: Providing 28V hold-up during 100ms AC-to-DC converter dropout in airborne communication systems. IC Role / Device Role / Timing Role: Ideal diode controller driving N-MOSFET in series with input - maintains output during reverse polarity or input sag with <30mV conduction loss. Use Value: Enables >99% hold-up efficiency vs 85% with Schottky; supports –40°C to 125°C operation per LTC3897IUHF#PBF temperature grade. |
Use Scenario: Powering LTE/CAN gateway in fleet vehicles exposed to wide ambient temperatures and vibration-induced transients. IC Role / Device Role / Timing Role: Surge stopper + boost controller combo - clamps 100V/10ms load-dump spikes and regulates output despite 4.5V–65V input variation. Use Value: Integrates protection and regulation into single 5mm×7mm QFN; reduces BOM count by 7 components and improves MTBF over discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3897EUHF#PBF | Same silicon, rated for 0°C to 85°C junction temperature (vs –40°C to 125°C for LTC3897IUHF#PBF); identical pinout, specs, and features. | Suitable for commercial-grade indoor equipment only; not qualified for extended temperature environments like engine bays or outdoor cabinets. | Select when ambient operating temperature remains below 85°C and cost sensitivity outweighs industrial qualification requirements. |
| LTC3897HUHF#PBF | Same silicon, rated for –40°C to 150°C junction temperature; higher thermal derating margin but identical electrical behavior and package. | Required for under-hood automotive or high-temperature industrial deployments where sustained 125°C+ ambient is expected. | Select when system-level thermal modeling predicts junction temperatures exceeding 125°C; no layout or schematic changes needed. |
Compared with LTC3897EUHF#PBF and LTC3897HUHF#PBF, the LTC3897IUHF#PBF offers the optimal balance of extended temperature capability (–40°C to 125°C), industrial qualification, and cost - making it the default choice for most transportation, energy, and infrastructure applications where reliability across environmental extremes is mandatory.
Availability
LTC3897IUHF#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial 24V-to-48V boost converters, and military avionics hold-up supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3897IUHF#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, 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 LTC3897IUHF#PBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC controllers, engineered specifically for robust, high-efficiency power conversion in harsh environments including automotive, industrial, and aerospace applications.
FAQ
What is the maximum input voltage the LTC3897IUHF#PBF can withstand without damage?
The LTC3897IUHF#PBF has an absolute maximum VIN rating of 76V and is designed to operate continuously up to 65V. It reliably survives 75V transients - confirmed in the Typical Application circuit (Figure 1) and Absolute Maximum Ratings table. This makes the LTC3897IUHF#PBF suitable for automotive cold-crank and load-dump scenarios where input spikes exceed nominal battery voltage.
Does the LTC3897IUHF#PBF require external bootstrap diodes for high-side gate drive?
No, the LTC3897IUHF#PBF integrates charge pumps for BOOST1 and BOOST2 pins, eliminating the need for external bootstrap diodes. As stated in the FEATURES section and verified in the Electrical Characteristics table, the device delivers sufficient charge pump current (70µA typical at 12V SW) to sustain gate drive for synchronous N-MOSFETs across its full operating frequency range.
How does the LTC3897IUHF#PBF implement reverse input protection?
The LTC3897IUHF#PBF 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 actively turns off the MOSFET and regulates reverse current to near-zero. The datasheet specifies reverse input protection down to –40V, with source-drain regulation voltage ΔVSD = 30mV ±10mV under normal forward operation.
Can the LTC3897IUHF#PBF be synchronized to an external clock?
Yes, the LTC3897IUHF#PBF supports external synchronization via the PLLIN/MODE pin. When configured as a clock input (per Pin Functions section), it accepts an external clock signal from 75kHz to 850kHz and locks the internal oscillator phase. This enables precise multi-phase interleaving across multiple LTC3897IUHF#PBF units using CLKOUT daisy-chaining or a common master clock.
What is the purpose of the DTC pin on the LTC3897IUHF#PBF?
The DTC (Dead Time Control) pin on the LTC3897IUHF#PBF selects the delay between top-gate turn-off and bottom-gate turn-on (and vice versa) to prevent shoot-through. It supports three settings: 60ns (DTC = GND), 100ns (DTC = float), or 200ns (DTC = INTVCC). This adjustment is critical for optimizing efficiency and reliability when using MOSFETs with varying gate charge and switching speed characteristics.
LTC3897IUHF#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)
LTC3897IUHF#PBF FAQ
1.How can I place an order for LTC3897IUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3897IUHF#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 LTC3897IUHF#PBF reliable?
The price and inventory of LTC3897IUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3897IUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3897IUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3897IUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3897IUHF#PBF?
LTC3897IUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3897IUHF#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 LTC3897IUHF#PBF?
For technical support, including LTC3897IUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3897IUHF#PBF requirements.
6.How does Aetrix verify that LTC3897IUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3897IUHF#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 LTC3897IUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3897IUHF#PBF?
All LTC3897IUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3897IUHF#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 LTC3897IUHF#PBF part is unused and in its original packaging.
Return procedure for LTC3897IUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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