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Analog Devices Inc. LTC3897IUHG-2#PBF
- Part No.:
- LTC3897IUHG-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3897IUHG-2#PBF.pdf
- Description:
- PP SYNC BOOST CNTR W/ IN/ OUT P
- Quantity:
- Payment:
- Shipping:
Inventory:1,745
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Product details
Overview
LTC3897IUHG-2#PBF 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, and features 55µA quiescent current in Burst Mode. Its two out-of-phase N-MOSFET stages reduce input/output capacitance requirements and enable high-efficiency 24V/10A boost conversion in industrial power systems.
For engineers reviewing the LTC3897IUHG-2#PBF datasheet, LTC3897IUHG-2#PBF pinout, LTC3897IUHG-2#PBF application, or LTC3897IUHG-2#PBF equivalent, key selection criteria include its dual-phase synchronous boost architecture, ±40V reverse input protection, adjustable gate drive (5–10V), programmable frequency (105–585 kHz), and integrated surge stopper with overcurrent and output disconnect functionality.
Technical Context
The LTC3897IUHG-2#PBF implements a PolyPhase® two-channel synchronous boost topology with interleaved switching to minimize ripple and capacitor stress. Its control loop integrates an error amplifier (1.200V feedback reference, ±0.01% load regulation), programmable current limit (41–155mV threshold), and OPTI-DRIVE gate voltage adjustment via DRVSET.
It embeds three independent protection subsystems: a surge stopper (SGEN-controlled N-MOSFET gate driver with adjustable clamp, inrush control, and output disconnect), an ideal diode controller (DGEN-driven N-MOSFET for reverse polarity protection and holdup), and comprehensive fault monitoring via TMR, IS+, IS−, and SPFB pins with configurable retry behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 65V continuous; withstands transients up to 75V - enables direct connection to automotive, industrial, or telecom supplies without external clamping. |
| Output Voltage Range | Up to 60V regulated - supports high-voltage battery charging, PoE++ PSE, and industrial sensor excitation rails. |
| Quiescent Current | 55µA in Burst Mode - extends battery life in always-on systems such as remote telemetry or backup power monitors. |
| Switching Frequency | Programmable 105–585 kHz (via FREQ pin or resistor) - allows optimization of efficiency vs. size trade-offs across 2.2–10µH inductors. |
| Gate Drive Voltage | Adjustable 5V to 10V (OPTI-DRIVE via DRVSET) - ensures full enhancement of both logic-level and standard-threshold N-MOSFETs. |
| Reverse Input Protection | –40V tolerance - prevents damage from accidental battery reversal or negative transients in vehicle-mounted equipment. |
| Current Sense Threshold | Configurable 41/95/140mV (via ILIM pin) - enables precise peak-current limiting across wide load ranges without sense resistor changes. |
Pinout & Package
Package: 38-lead (5mm × 8mm) plastic QFN (UHG), exposed pad soldered to GND for thermal and electrical integrity. θJA = 36°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply | Accepts 4.5–65V; internally routed to surge stopper, ideal diode, and bias generation - must be decoupled near package edge. |
| SG / DG | Surge stopper & ideal diode gate drivers | High-side N-MOSFET gate outputs; each capable of >100mA sink/source - require low-inductance gate resistors and local bypassing. |
| TG1/TG2, BG1/BG2 | Boost stage top/bottom gate drivers | Drive synchronous N-MOSFETs per phase; TG outputs swing above SW node via BOOSTx charge pumps - critical for bootstrap-free operation. |
| SENSE1+/SENSE1−, SENSE2+/SENSE2− | Dual-channel current sense inputs | Differential inputs for per-phase inductor current sensing; common-mode range up to 65V - enable accurate cycle-by-cycle current limiting. |
| DRVCC | Gate driver LDO output | Regulated 5–10V supply (set by DRVSET); powers all gate drivers - requires ≥4.7µF low-ESR ceramic capacitor directly at pin. |
| INTVCC | Analog/digital core LDO output | 3.5V internal regulator output - powers error amp, comparators, and logic; not for external loads; bypass with 0.1µF ceramic. |
| CS | Surge stopper current sense reference | Common-source node for surge MOSFET; used with IS+ and IS− to detect overcurrent and set clamp voltage - must be low-impedance. |
| SPFB | Surge protection feedback | Compares against 1.235V internal reference to regulate input clamp voltage - sets maximum VIN during transients. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase interleaved boost | Reduces input/output ripple by ~70% vs. single-phase, enabling smaller bulk capacitors and lower EMI filter cost. |
| Integrated surge stopper | Replaces discrete high-voltage protection ICs; provides adjustable input clamping, inrush limiting, and automatic output disconnect on fault. |
| Ideal diode controller | Enables Schottky-replacement N-MOSFET with <30mV forward regulation - cuts conduction loss by >50% and eliminates reverse leakage. |
| OPTI-DRIVE gate voltage control | Eliminates need for external level shifters or dual-supply gate drivers - simplifies layout and supports mixed FET families in same design. |
| Programmable dead time (DTC) | Three selectable dead times (60/100/200ns) prevent shoot-through in high-frequency, high-dV/dt applications like 48V server power. |
| Burst Mode operation | Maintains >85% efficiency down to 1mA load - essential for standby power compliance in industrial controllers and IoT gateways. |
Applications
| Automotive Power Supply | Industrial 48V DC Distribution |
|---|---|
Use Scenario: 12V/24V vehicle battery powering 48V subsystems (ADAS cameras, radar, infotainment) under cold-crank (4.5V) and load-dump (75V) conditions. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller with integrated surge stopper and reverse polarity protection. Use Value: Eliminates need for external TVS arrays and discrete ideal diodes; maintains regulated 48V output across full automotive temperature range (–40°C to 125°C). |
Use Scenario: Converting 24V factory bus to stable 48V rail for PLC I/O modules, motor drives, and fieldbus gateways requiring high immunity to line disturbances. IC Role / Device Role / Timing Role: High-efficiency polyphase boost controller with programmable frequency and robust overcurrent response. Use Value: Achieves >95% efficiency at 10A while reducing input capacitor count by 50% versus single-phase solutions - lowers BOM cost and board area. |
| Telecom Remote Radio Unit (RRU) | Military/Aerospace Hold-Up Supply |
Use Scenario: Boosting –48V telecom supply to +60V for RF power amplifiers in outdoor base stations exposed to lightning-induced surges and reverse polarity faults. IC Role / Device Role / Timing Role: Surge-tolerant boost controller with –40V reverse input protection and fast overvoltage shutdown. Use Value: Survives repeated –40V reverse connections and 75V transients without latch-up; enables single-board RRU designs without external protection circuitry. |
Use Scenario: Providing uninterrupted 28V output during 100ms input dropouts in avionics systems using supercapacitor hold-up, with strict EMI and reliability requirements. IC Role / Device Role / Timing Role: Low-quiescent-current boost controller with ideal diode function for seamless switchover between main and backup sources. Use Value: 55µA Burst Mode IQ extends hold-up time; ideal diode regulation (<30mV drop) minimizes voltage sag during source transition - meets MIL-STD-704F transient specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3897EUHG-2#PBF | Same silicon, rated for 0°C to 85°C junction temperature (vs. –40°C to 125°C for LTC3897IUHG-2#PBF). | Suitable for commercial-grade indoor equipment only; not qualified for extended temperature environments. | Select when ambient operating temperature remains below 70°C and industrial qualification is unnecessary. |
| LTC3897HUHG-2#PBF | Same silicon, rated for –40°C to 150°C junction temperature; higher thermal derating margin. | Required for under-hood automotive, high-temperature industrial enclosures, or aerospace applications exceeding 125°C ambient. | Choose for mission-critical systems where long-term reliability at elevated temperatures is mandatory. |
Compared with LTC3897EUHG-2#PBF and LTC3897HUHG-2#PBF, the LTC3897IUHG-2#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 ruggedized embedded power designs without extreme thermal demands.
Availability
LTC3897IUHG-2#PBF is available at Aetrix Electronics and suitable for automotive power conversion, industrial 48V distribution, telecom RRU supplies, and military hold-up systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3897IUHG-2#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 industrial, automotive, communications, and defense markets.
The LTC3897-2 product line delivers highly integrated, robust DC/DC controllers for demanding power conversion tasks - specifically designed for applications requiring wide input range, surge resilience, and multi-function protection in compact footprints.
FAQ
What is the maximum input voltage transient the LTC3897IUHG-2#PBF can survive?
The LTC3897IUHG-2#PBF is rated to withstand input transients up to 75V on the VIN pin without damage or latch-up. This is validated per Absolute Maximum Ratings and confirmed in typical application circuits. The integrated surge stopper actively clamps sustained overvoltages above the SPFB-set threshold, protecting downstream circuitry. Operation beyond 75V risks permanent damage.
Does the LTC3897IUHG-2#PBF support synchronization to an external clock?
Yes, the LTC3897IUHG-2#PBF supports external clock synchronization via the PLLIN/MODE pin. When an external clock signal (75–550 kHz) is applied, the internal phase-locked loop aligns the rising edge of BG1 to the external clock's rising edge. This enables deterministic timing across multiple phases or noise-sensitive systems - a feature confirmed in the Pin Functions and Electrical Characteristics sections.
How does the ideal diode function of the LTC3897IUHG-2#PBF improve system efficiency?
The LTC3897IUHG-2#PBF's ideal diode controller drives an external N-MOSFET to replace a Schottky diode, regulating the forward voltage drop to just 20–40mV (typical). This reduces conduction loss by >50% compared to a 0.4V Schottky, especially at high currents. Reverse current is also minimized, eliminating leakage paths - directly improving efficiency and thermal performance in input protection and hold-up applications.
Can the LTC3897IUHG-2#PBF operate with only one phase enabled?
No - the LTC3897IUHG-2#PBF is a fixed dual-phase controller and requires both boost channels (TG1/BG1/SW1/BOOST1 and TG2/BG2/SW2/BOOST2) to be populated and configured. Its interleaved architecture and current-sharing logic are not designed for single-phase operation. Disabling one channel would violate functional safety assumptions and invalidate current limit calibration.
What is the purpose of the DTC pin on the LTC3897IUHG-2#PBF?
The DTC (Dead Time Control) pin on the LTC3897IUHG-2#PBF selects the non-overlap time between top-gate (TG) turn-off and bottom-gate (BG) turn-on, and vice versa. It offers three settings: 60ns (DTC = GND), 100ns (DTC = float), or 200ns (DTC = INTVCC). This prevents shoot-through in high-speed switching, especially critical when using fast-switching GaN or low-RDS(on) Si MOSFETs at frequencies above 400kHz.
LTC3897IUHG-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- 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)
LTC3897IUHG-2#PBF FAQ
1.How can I place an order for LTC3897IUHG-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3897IUHG-2#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 LTC3897IUHG-2#PBF reliable?
The price and inventory of LTC3897IUHG-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3897IUHG-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3897IUHG-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3897IUHG-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3897IUHG-2#PBF?
LTC3897IUHG-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3897IUHG-2#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 LTC3897IUHG-2#PBF?
For technical support, including LTC3897IUHG-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3897IUHG-2#PBF requirements.
6.How does Aetrix verify that LTC3897IUHG-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3897IUHG-2#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 LTC3897IUHG-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3897IUHG-2#PBF?
All LTC3897IUHG-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3897IUHG-2#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 LTC3897IUHG-2#PBF part is unused and in its original packaging.
Return procedure for LTC3897IUHG-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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