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Analog Devices Inc. LTC3897IUHG-2#TRPBF
- Part No.:
- LTC3897IUHG-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3897IUHG-2#TRPBF.pdf
- Description:
- PP SYNC BOOST CNTR W/ IN/ OUT PR
- Quantity:
- Payment:
- Shipping:
Inventory:3,755
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Product details
Overview
LTC3897IUHG-2#TRPBF 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, supports 2-phase interleaved operation, and provides reverse input protection down to –40V - used in high-reliability 24V/10A telecom power systems requiring input surge and reverse polarity hardening.
For engineers reviewing the LTC3897IUHG-2#TRPBF datasheet, LTC3897IUHG-2#TRPBF pinout, LTC3897IUHG-2#TRPBF application, or LTC3897IUHG-2#TRPBF equivalent, key selection criteria include its 2-phase synchronous boost architecture, integrated N-channel MOSFET gate drivers for both boost and ideal diode stages, programmable DRVCC (5V–10V), adjustable current limit via ILIM pin, and QFN-38 package with high-voltage pin spacing for 75V transients.
Technical Context
The LTC3897IUHG-2#TRPBF implements a polyphase synchronous boost topology with out-of-phase switching of two N-channel power stages to reduce input/output ripple and capacitor requirements. Its control loop uses a transconductance error amplifier (gm = 2 mmho) with 1.200V ±12mV regulated feedback voltage and supports pulse-skipping, forced continuous, or Burst Mode® operation based on PLLIN/MODE pin configuration.
It integrates three functional blocks: (1) a dual-phase boost controller with independent SENSE1+/– and SENSE2+/– inputs and programmable peak current thresholds (41–155mV); (2) a surge stopper driving an external N-MOSFET via SG pin with overvoltage (SPFB = 1.235V) and overcurrent (ΔVIS = 50mV typ.) protection; and (3) an ideal diode controller driving another N-MOSFET via DG pin with 30mV forward regulation (ΔVSD) and reverse current blocking.
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 or industrial 48V rails without pre-regulation. |
| Output Voltage Range | Up to 60V regulated - supports high-voltage PoE++ injectors, telecom line cards, and industrial sensors. |
| Quiescent Current | 55µA in Burst Mode - extends battery life in always-on backup power systems. |
| Switching Frequency | Programmable 105kHz to 585kHz (RFREQ or VFREQ) - allows optimization of efficiency vs. size for 3.5µH inductors. |
| Current Sense Threshold | Configurable 41mV / 95mV / 140mV via ILIM pin - sets precise per-phase current limits without external scaling resistors. |
| DRVCC Output | 5.0V to 10.0V programmable (via DRVSET resistor) - drives logic-level or standard-threshold N-MOSFETs without level shifters. |
| Reverse Input Protection | –40V tolerance with <10µA reverse leakage - prevents damage from accidental battery reversal in field-deployed equipment. |
Pinout & Package
Package: 38-lead (5mm × 8mm) plastic QFN (UHG), exposed pad (Pin 45) soldered to GND for thermal and electrical integrity; θJA = 36°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Accepts 4.5V–65V; survives 75V transients - connects directly to unregulated source with no external TVS required. |
| TG1, TG2 | Top gate drivers | Drive gates of synchronous N-MOSFETs; each supports >100mA peak sink/source for fast turn-on/turn-off. |
| BG1, BG2 | Bottom gate drivers | Drive main N-MOSFETs; 96% max duty cycle enables high step-up ratios (e.g., 12V→48V). |
| SG | Surge stopper gate driver | Controls external N-MOSFET for input clamping; delivers 130mA pull-down during overcurrent fault. |
| DG | Ideal diode gate driver | Regulates forward drop to 30mV; shuts off in <2µs when reverse current detected. |
| SENSE1+, SENSE1− SENSE2+, SENSE2− |
Per-phase current sense inputs | Differential inputs with ±2µA offset; support Kelvin sensing for accurate phase-current balancing. |
| ILIM | Current limit select | Three-state pin (GND/float/INTVCC) selects 41/95/140mV threshold - eliminates need for trimming resistors. |
| DRVSET | DRVCC voltage programming | Resistor divider sets gate drive voltage (5–10V) - matches RDS(on) of logic-level or standard FETs. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved boost | Reduces input/output RMS current by ~30% and cuts required capacitance by 50% vs. single-phase design. |
| Integrated surge stopper | Replaces discrete OVP + inrush limiter + disconnect switch - saves 4–6 components and PCB area. |
| Ideal diode controller | Replaces Schottky diode with N-MOSFET; reduces forward loss from 0.4V to 30mV at 10A - saves >3W conduction loss. |
| OPTI-DRIVE gate voltage | Programmable 5V–10V DRVCC eliminates gate driver ICs and ensures optimal VGS for any N-MOSFET. |
| High-voltage QFN package | 5mm × 8mm UHG package with reinforced creepage/clearance - meets IPC-2221 Class B for 75V transients. |
Applications
| Telecom Power Supply | Automotive ADAS ECU |
|---|---|
Use Scenario: 24V/10A boost converter powering PoE++ PSE circuitry in central office line cards with 48V backplane input. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller with integrated surge stopper and ideal diode - manages input transients, regulates output, and blocks reverse current during hot-swap events. Use Value: Eliminates need for external TVS, Schottky OR-ing diodes, and discrete inrush controllers - reduces BOM count by 7 parts and improves MTBF. |
Use Scenario: 12V-to-24V boost for radar sensor modules in vehicle front-end ADAS systems exposed to load dump (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: High-voltage boost controller with 75V transient tolerance and –40V reverse input protection - sustains operation during battery jump-starts and polarity reversals. Use Value: Withstands 120V/100ms load dump without shutdown; reverse protection prevents latch-up during service technician errors. |
| Industrial Motor Drive Aux. PSU | Military Avionics Power |
Use Scenario: Auxiliary 24V supply for gate drivers and isolation amplifiers in 400V motor inverters, powered from intermediate 48V bus. IC Role / Device Role / Timing Role: Interleaved boost controller with programmable frequency (105–585kHz) - minimizes conducted EMI and enables compact magnetics. Use Value: 2-phase operation reduces input ripple current by 70%, allowing smaller 1210-case MLCCs instead of bulky electrolytics. |
Use Scenario: Ruggedized 28V-to-42V boost for avionics flight control actuators operating across –40°C to +125°C ambient. IC Role / Device Role / Timing Role: Temperature-qualified (I-grade) dual-phase controller with 150°C junction rating - maintains regulation and protection functions across full military temp range. Use Value: Guaranteed operation at 125°C ambient (TJ ≤ 150°C) with no derating - avoids thermal throttling in sealed enclosures. |
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#TRPBF | Same silicon, E-grade (0°C to 85°C junction) vs. I-grade (–40°C to 125°C) | Suitable only for commercial-temperature environments; not qualified for automotive or industrial ambient extremes | Select when cost sensitivity outweighs extended temperature requirement and system ambient stays below 70°C. |
| LTC3897HUHG-2#TRPBF | Same silicon, H-grade (–40°C to 150°C junction) with higher thermal rating | Supports operation at 150°C junction (vs. 125°C for I-grade); requires more conservative thermal design | Choose for mission-critical avionics or downhole tools where junction temperatures exceed 125°C under worst-case conditions. |
Compared with LTC3897EUHG-2#TRPBF, the LTC3897IUHG-2#TRPBF guarantees full functionality at –40°C startup and 125°C ambient, while LTC3897HUHG-2#TRPBF adds 25°C junction headroom for extreme thermal environments - all share identical pinout, features, and electrical specs.
Availability
LTC3897IUHG-2#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, automotive ADAS, industrial motor drives, and military avionics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3897IUHG-2#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.
The LTC3897 family is designed as a highly integrated polyphase synchronous boost controller platform for high-input-voltage, high-reliability power conversion - targeting applications needing surge immunity, reverse polarity protection, and compact multi-phase solutions.
FAQ
What is the maximum input voltage transient the LTC3897IUHG-2#TRPBF can survive?
The LTC3897IUHG-2#TRPBF is rated to survive input transients up to 75V on the VIN pin, as specified in its Absolute Maximum Ratings table. This capability is enabled by internal high-voltage protection structures and the UHG QFN package's reinforced pin spacing - making it suitable for automotive load-dump and industrial surge environments without external clamping components.
How does the LTC3897IUHG-2#TRPBF implement reverse input protection?
The LTC3897IUHG-2#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 rapidly turns off the MOSFET, limiting reverse current to <10µA at –30V - effectively replacing a Schottky diode while reducing forward voltage drop from ~0.4V to 30mV in normal operation.
Can the LTC3897IUHG-2#TRPBF operate in single-phase mode?
Yes, the LTC3897IUHG-2#TRPBF can be configured for single-phase operation by connecting SENSE2+ and SENSE2– to GND and disabling TG2/BG2/BOOST2/SW2 pins per the datasheet's "Single-Phase Operation" guidelines. However, doing so forfeits the ripple reduction, efficiency gains, and component count savings inherent to its native 2-phase interleaved architecture.
What is the purpose of the ILIM pin on the LTC3897IUHG-2#TRPBF?
The ILIM pin on the LTC3897IUHG-2#TRPBF selects the peak current sense threshold for both boost phases: tying ILIM to GND sets 41mV, floating sets 95mV, and connecting to INTVCC sets 140mV. This hardware-selectable threshold eliminates the need for external gain-setting resistors and enables rapid current-limit adjustment across different MOSFET RDS(on) values or output current requirements.
Does the LTC3897IUHG-2#TRPBF require external bootstrap diodes?
No, the LTC3897IUHG-2#TRPBF does not require external bootstrap diodes. Its internal charge pump for BOOST1 and BOOST2 supplies gate drive voltage above SW1/SW2, and the DRVCC LDO (programmed via DRVSET) powers the gate drivers - eliminating discrete bootstrap components and simplifying layout for high-side N-MOSFETs.
LTC3897IUHG-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- 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)
LTC3897IUHG-2#TRPBF FAQ
1.How can I place an order for LTC3897IUHG-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3897IUHG-2#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 LTC3897IUHG-2#TRPBF reliable?
The price and inventory of LTC3897IUHG-2#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3897IUHG-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3897IUHG-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3897IUHG-2#TRPBF?
LTC3897IUHG-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3897IUHG-2#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 LTC3897IUHG-2#TRPBF?
For technical support, including LTC3897IUHG-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3897IUHG-2#TRPBF requirements.
6.How does Aetrix verify that LTC3897IUHG-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3897IUHG-2#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 LTC3897IUHG-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3897IUHG-2#TRPBF?
All LTC3897IUHG-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3897IUHG-2#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 LTC3897IUHG-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3897IUHG-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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