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Analog Devices Inc. LTC3897HUHG-2#TRPBF
- Part No.:
- LTC3897HUHG-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3897HUHG-2#TRPBF.pdf
- Description:
- PP SYNC BOOST CNTR W/ IN/ OUT PR
- Quantity:
- Payment:
- Shipping:
Inventory:3,970
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Product details
Overview
LTC3897HUHG-2#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 requiring input transient protection up to 75V, reverse input protection to –40V, and regulated 24V/10A output in automotive and industrial power supplies.
For engineers reviewing the LTC3897HUHG-2#TRPBF datasheet, LTC3897HUHG-2#TRPBF pinout, LTC3897HUHG-2#TRPBF application, or LTC3897HUHG-2#TRPBF equivalent, this page delivers verified technical context, exact package mapping (QFN-44, 5mm × 9mm), confirmed 2-phase gate drive timing, validated current sense thresholds (48/95/140mV), and real-world protection behavior under overvoltage, overcurrent, and reverse polarity conditions.
Technical Context
The LTC3897HUHG-2#TRPBF 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 surge stopper uses SG pin control of an external N-MOSFET to clamp transients and enforce programmable overvoltage thresholds via SPFB feedback.
The integrated ideal diode controller drives DG to regulate forward voltage drop (20–40mV) across an external N-MOSFET for reverse input protection and holdup, while independent ILIM pin selection configures per-phase current limit thresholds (48mV/GND, 95mV/floating, 140mV/INTVCC) without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 65V continuous; survives 75V transients - enables direct connection to 24V/48V industrial buses with transient immunity. |
| Output Voltage Range | Up to 60V regulated - supports wide-range battery charging, PoE++ midspan, and high-voltage LED drivers. |
| Quiescent Current | 55µA in Burst Mode - extends runtime in always-on systems such as telematics and remote sensors. |
| Phase Configuration | 2-phase interleaved operation - cuts input/output RMS current by ~30% vs single-phase, reducing capacitor count and EMI. |
| Gate Drive Level | 5V to 10V OPTI-DRIVE (via DRVSET) - supports both logic-level and standard-threshold MOSFETs without external level shifters. |
| Protection Functions | Input surge clamping, reverse input protection (–40V), inrush control, overcurrent shutdown, output disconnect - eliminates need for discrete protection ICs. |
| Package | 5mm × 9mm QFN-44 with exposed GND pad - provides low thermal resistance (θJA = 36°C/W) for high-power density designs. |
Pinout & Package
Package: 44-lead plastic QFN (5mm × 9mm), exposed pad (Pin 45) connected to GND. High-voltage pin spacing ensures >75V isolation between VIN-related pins and low-voltage analog pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 4.5V–65V; withstands 75V transients - connects directly to unregulated bus or battery. |
| SG | Surge stopper gate driver output | Drives external N-MOSFET source to clamp input surges; supports adjustable OV threshold via SPFB. |
| DG | Ideal diode gate driver output | Regulates forward VSD to 20–40mV; blocks reverse current down to –40V input. |
| TG1/TG2 | Top gate drivers (phase 1/2) | Drive synchronous N-MOSFET gates with 5–10V programmable level; no external bootstrap diodes needed. |
| BG1/BG2 | Bottom gate drivers (phase 1/2) | Control main N-MOSFETs; support 96% max duty cycle for high step-up ratios. |
| SENSE1+/SENSE2+ | Positive current sense inputs | Connect to high-side of sense resistors; supply bias to current comparators. |
| SENSE1–/SENSE2– | Negative current sense inputs | Connect to low-side of sense resistors; enable accurate per-phase current limiting. |
| ILIM | Current limit threshold select | GND/floating/INTVCC sets peak sense voltage to 48mV/95mV/140mV - configures full-scale current without trimming. |
| DRVSET | DRVCC LDO output voltage control | Resistor divider or direct tie sets gate drive voltage (5.0–10.0V) - matches FET VGS(th) and RDS(on). |
| SPFB | Surge protection feedback | 1.235V reference input - programs overvoltage clamp point using resistor divider from SG to VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Interleaved 2-phase boost control | Reduces input/output capacitor RMS current by ~30%, enabling smaller 1210/1206 ceramic caps instead of bulk electrolytics. |
| Integrated surge stopper + ideal diode | Replaces 3–4 discrete protection ICs and Schottky diodes - simplifies BOM and improves reliability in harsh environments. |
| Programmable gate drive (OPTI-DRIVE) | Single DRVSET pin selects 5V/6V/7V/8V/9V/10V drive - optimizes switching loss vs conduction loss for any N-MOSFET. |
| Three-level current limit configuration | ILIM pin selects 48mV/95mV/140mV thresholds - eliminates calibration resistors and supports scalable current sensing. |
| Burst Mode quiescent current | 55µA at no load - meets <100µA standby requirements for ISO 26262 ASIL-B automotive modules. |
| High-temp rated H-grade (-40°C to 150°C) | Guaranteed operation up to 150°C junction - qualified for under-hood automotive and avionics applications. |
Applications
| Automotive Power Distribution | Industrial 48V DC Bus Converter |
|---|---|
Use Scenario: 24V battery-fed ADAS ECU requiring clean 24V/10A output with immunity to load dump (ISO 16750-2) and reverse battery connection. IC Role / Device Role / Timing Role: Dual-phase boost controller + integrated surge stopper + ideal diode - replaces discrete TVS, MOSFET drivers, and OR-ing controllers. Use Value: Survives 75V transients and –40V reverse input without external protection; reduces board area by 40% vs discrete solution. |
Use Scenario: Factory automation PLC converting 48V DC bus to isolated 24V/10A for I/O modules with strict EMI limits. IC Role / Device Role / Timing Role: Interleaved synchronous boost controller - minimizes input ripple and conducted emissions via phase offset. Use Value: 2-phase operation cuts input cap RMS current by 30%, enabling compact 1210 MLCC stack instead of 2× 1000µF electrolytics. |
| Avionics Hold-Up Supply | Telecom Midspan Power Injector |
Use Scenario: MIL-STD-704F compliant airborne system needing 28V hold-up during 200ms input dropout, with reverse polarity protection. IC Role / Device Role / Timing Role: Ideal diode controller + surge stopper - maintains output during brownout while blocking reverse current from backup capacitors. Use Value: 20–40mV forward regulation enables >99% hold-up efficiency; –40V reverse rating exceeds MIL-STD-704F requirement. |
Use Scenario: IEEE 802.3bt Type 4 PoE++ midspan injector delivering 90W to remote access points with input surge tolerance. IC Role / Device Role / Timing Role: High-voltage boost controller - generates stable 57V output from 36–57V input range with programmable frequency (105–585kHz). Use Value: Adjustable FREQ pin supports EMI spread-spectrum tuning; 60V max output supports PoE++ Class 8 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3897IUHG-2#TRPBF | Same functionality, rated for –40°C to 125°C junction temperature (vs H-grade's 150°C). | Suitable for commercial/industrial ambient environments but not under-hood automotive or avionics. | Select when operating ambient stays below 85°C and cost sensitivity outweighs extended temperature margin. |
| LTC3897EUHG-2#TRPBF | Same silicon, rated for –40°C to 85°C junction temperature; lower test coverage than I/H grades. | Intended for consumer or non-critical embedded systems where extended temperature validation is unnecessary. | Choose only for cost-driven, non-safety-critical applications with controlled thermal environments. |
Compared with LTC3897IUHG-2#TRPBF and LTC3897EUHG-2#TRPBF, the LTC3897HUHG-2#TRPBF provides guaranteed operation up to 150°C junction temperature, enabling deployment in high-ambient locations like engine compartments or sealed avionics enclosures without derating or forced cooling.
Availability
LTC3897HUHG-2#TRPBF is available at Aetrix Electronics and suitable for automotive power distribution, industrial 48V DC bus conversion, avionics hold-up supplies, and telecom midspan power injectors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3897HUHG-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and aerospace markets.
The LTC3897HUHG-2#TRPBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC controllers, engineered specifically for robust power conversion in harsh environments including automotive, military, and industrial applications.
FAQ
What is the maximum input voltage the LTC3897HUHG-2#TRPBF can withstand without damage?
The LTC3897HUHG-2#TRPBF has an absolute maximum VIN rating of 76V and is specified to operate continuously from 4.5V to 65V. It is designed to survive input transients up to 75V - verified per typical application circuits and absolute maximum ratings tables in the official datasheet. This makes the LTC3897HUHG-2#TRPBF suitable for 24V and 48V systems exposed to load dump or inductive kickback events.
How does the ILIM pin configure current limiting on the LTC3897HUHG-2#TRPBF?
The ILIM pin on the LTC3897HUHG-2#TRPBF selects one of three fixed current sense thresholds: tying ILIM to GND sets VSENSE(MAX) to 48mV, floating sets it to 95mV, and connecting to INTVCC sets it to 140mV. These values correspond directly to peak inductor current limits and are internally trimmed - eliminating the need for external calibration resistors. The LTC3897HUHG-2#TRPBF uses these thresholds to trigger overcurrent shutdown in both boost phases independently.
Can the LTC3897HUHG-2#TRPBF be used in single-phase mode?
Yes, the LTC3897HUHG-2#TRPBF supports single-phase operation by disabling one channel: tie PHASMD to GND to force BG2/TG2 inactive while maintaining full functionality on Phase 1 (BG1/TG1). The controller retains all protection features (surge stopper, ideal diode, soft-start, UVLO) regardless of phase count. However, interleaving benefits - reduced ripple, lower RMS current - are forfeited in single-phase mode.
What is the purpose of the DTC pin on the LTC3897HUHG-2#TRPBF?
The DTC (Dead Time Control) pin on the LTC3897HUHG-2#TRPBF sets the non-overlap time between top-gate (TG) turn-off and bottom-gate (BG) turn-on to prevent shoot-through. Floating DTC yields 100ns dead time; tying to GND gives 60ns (for faster switching), and tying to INTVCC gives 200ns (for enhanced safety margin). This adjustment directly impacts efficiency and reliability in high-frequency, high-current boost stages.
Does the LTC3897HUHG-2#TRPBF require external bootstrap diodes for high-side gate drive?
No, the LTC3897HUHG-2#TRPBF integrates charge pump circuitry for BOOST1 and BOOST2 pins and does not require external bootstrap diodes. Its internal charge pumps generate the floating gate drive voltage needed for the synchronous N-MOSFETs (TG1/TG2), simplifying layout and improving reliability. This is explicitly confirmed in the FEATURES section and PIN FUNCTIONS documentation for the LTC3897HUHG-2#TRPBF.
LTC3897HUHG-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3897HUHG-2#TRPBF FAQ
1.How can I place an order for LTC3897HUHG-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3897HUHG-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 LTC3897HUHG-2#TRPBF reliable?
The price and inventory of LTC3897HUHG-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 LTC3897HUHG-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3897HUHG-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3897HUHG-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3897HUHG-2#TRPBF?
LTC3897HUHG-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3897HUHG-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 LTC3897HUHG-2#TRPBF?
For technical support, including LTC3897HUHG-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3897HUHG-2#TRPBF requirements.
6.How does Aetrix verify that LTC3897HUHG-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3897HUHG-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 LTC3897HUHG-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3897HUHG-2#TRPBF?
All LTC3897HUHG-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3897HUHG-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 LTC3897HUHG-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3897HUHG-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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