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Analog Devices Inc. LTC3897EUHG-2#TRPBF
- Part No.:
- LTC3897EUHG-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3897EUHG-2#TRPBF.pdf
- Description:
- PP SYNC BOOST CNTR W/ IN/ OUT PR
- Quantity:
- Payment:
- Shipping:
Inventory:2,886
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Product details
Overview
LTC3897EUHG-2#TRPBF 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 provides reverse input protection to –40V - used in automotive power systems requiring robust transient immunity and holdup capability.
For engineers reviewing the LTC3897EUHG-2#TRPBF datasheet, LTC3897EUHG-2#TRPBF pinout, LTC3897EUHG-2#TRPBF application, or LTC3897EUHG-2#TRPBF equivalent, key selection criteria include its 2-phase synchronous boost architecture, programmable gate drive (5V–10V OPTI-DRIVE), integrated surge stopper with adjustable clamp, ideal diode control for reverse polarity protection, and QFN-44 (5mm × 9mm) high-voltage pin spacing package.
Technical Context
The LTC3897EUHG-2#TRPBF implements a polyphase synchronous boost topology with independent current-mode control per phase, using SENSE1+/– and SENSE2+/– inputs for peak-current sensing. Its surge stopper block regulates an external N-MOSFET via SG pin with overvoltage (SPFB feedback), overcurrent (IS+/– differential sense), and inrush control.
The ideal diode controller operates via DG pin to drive a second N-MOSFET for reverse-input protection and voltage holdup, maintaining a regulated forward drop (ΔVSD = 20–40mV) while blocking reverse current. Gate drive is configurable via DRVSET (5V–10V) and dead time via DTC pin (60ns/100ns/200ns).
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 24V/48V industrial or automotive batteries with load dump immunity. |
| Output Voltage Range | Up to 60V regulated - supports high-voltage rail generation for RF power amplifiers or LED drivers without external regulation. |
| Quiescent Current | 55µA in Burst Mode - extends battery life in always-on automotive modules during sleep states. |
| Switching Frequency | Programmable 105kHz–585kHz (via FREQ pin or resistor) - allows optimization of efficiency vs. size for inductor/capacitor selection. |
| Gate Drive Voltage | Adjustable 5V–10V (OPTI-DRIVE via DRVSET) - supports both logic-level and standard-threshold N-MOSFETs without external level shifters. |
| Reverse Input Protection | Rated to –40V - prevents damage from accidental battery reversal in vehicle subsystems. |
| Package | 5mm × 9mm QFN-44 with exposed GND pad - provides thermal performance (θJA = 36°C/W) and high-voltage isolation between VIN-adjacent pins. |
Pinout & Package
Package: 44-lead (5mm × 9mm) plastic QFN (UHG), exposed pad soldered to PCB ground for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 4.5V–65V; survives 75V transients - connects directly to battery or unregulated DC source. |
| SG | Surge stopper gate driver output | Drives external N-MOSFET source to protect downstream circuitry from overvoltage, overcurrent, and inrush events. |
| DG | Ideal diode gate driver output | Controls N-MOSFET for reverse-polarity blocking and low-loss forward conduction (20–40mV drop). |
| TG1/TG2 | Top gate drivers (Phase 1/2) | Drive gates of synchronous rectifier MOSFETs; support 5V–10V OPTI-DRIVE for optimal RDS(on) utilization. |
| BG1/BG2 | Bottom gate drivers (Phase 1/2) | Drive gates of main boost switches; feature matched pull-up/pull-down resistance (2.5Ω/1Ω) for precise timing control. |
| SENSE1+/–, SENSE2+/– | Dual-channel current sense inputs | Enable per-phase peak-current mode control; threshold selectable (41–155mV) via ILIM pin configuration. |
| DRVSET | DRVCC LDO output voltage programming | Sets gate drive voltage (5.0V/6.4V/7.0V/7.6V/9.0V) via resistor divider - eliminates need for external gate driver supplies. |
| DTC | Dead time control | Selects 60ns/100ns/200ns dead time between top/bottom switch transitions - prevents shoot-through in high-side/lower-side MOSFET pairs. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved boost control | Reduces input/output ripple current by ~70% vs. single-phase - cuts required input/output capacitance and EMI filter size. |
| Integrated surge stopper | Replaces discrete overvoltage/overcurrent protection ICs - simplifies BOM and improves response time (<2µs fault detection). |
| Onboard ideal diode controller | Eliminates Schottky diode losses (typ. 0.3–0.5V drop) - improves efficiency at low loads and enables bidirectional holdup capability. |
| No external bootstrap diodes required | Internal charge pumps for BOOST1/BOOST2 - reduces component count and layout complexity in high-voltage boost designs. |
| Programmable frequency & phase sync | Supports daisy-chained multi-phase operation via CLKOUT and PLLIN/MODE - enables scalable power delivery up to 4+ phases. |
Applications
| Automotive Infotainment Power | Industrial 48V DC-DC Conversion |
|---|---|
Use Scenario: Powering LCD backlight and audio amplifiers from a 12V vehicle battery subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller with integrated surge stopper and ideal diode - manages input transients while generating stable 24V/48V rails. Use Value: Eliminates need for separate TVS, ideal diode, and boost ICs - reduces board area by >35% and improves system reliability under ISO 7637-2 pulse 5a/b conditions. | Use Scenario: Converting 24V factory bus to 48V for PoE++ switches or servo motor drivers in harsh industrial environments. IC Role / Device Role / Timing Role: High-input-voltage boost controller with reverse polarity protection and programmable gate drive - ensures safe startup and sustained operation during brownouts. Use Value: Withstands –40V reverse input and 75V surges without latch-off - avoids field failures caused by wiring errors or lightning-induced transients. |
| Military Avionics Holdup Supply | Telecom Remote Radio Unit (RRU) |
Use Scenario: Providing uninterrupted 28V power to flight-critical sensors during engine start-up dips or generator switchover events. IC Role / Device Role / Timing Role: Ideal diode + boost controller combo - maintains output voltage via capacitor holdup while blocking reverse current from backup sources. Use Value: ΔVSD regulation (20–40mV) minimizes conduction loss during holdup - extends holdup time by 2.3× vs. Schottky diode solutions at 10A load. | Use Scenario: Generating 28V bias for GaN power amplifiers in outdoor 5G base stations powered from -48V telecom rectifiers. IC Role / Device Role / Timing Role: Synchronous boost controller with programmable 535kHz switching - balances efficiency and EMI compliance in compact RF enclosures. Use Value: OPTI-DRIVE (5V–10V) enables use of low-RDS(on) GaN FETs - achieves >95% efficiency at 5A output while meeting EN 55022 Class B emissions. |
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 silicon, rated for –40°C to 125°C junction temperature (vs. –40°C to 125°C for LTC3897EUHG-2#TRPBF); identical electrical specs. | Qualified for extended-temperature industrial applications where ambient exceeds 85°C but does not require automotive AEC-Q100. | Select when operating junction temperature may exceed 125°C under worst-case power dissipation and ambient conditions. |
| LTC3897HUHG-2#TRPBF | Same silicon, rated for –40°C to 150°C junction temperature; higher thermal stress screening and longer lifetime validation. | Required for under-hood automotive or military avionics deployments where sustained 150°C case temperature is expected. | Choose for mission-critical systems demanding highest reliability grade and guaranteed operation at 150°C junction. |
Compared with LTC3897IUHG-2#TRPBF and LTC3897HUHG-2#TRPBF, the LTC3897EUHG-2#TRPBF offers identical functionality and performance but is characterized for commercial-grade temperature operation (0°C to 85°C junction), making it optimal for cost-sensitive industrial and telecom equipment where full extended-temperature qualification is unnecessary.
Availability
LTC3897EUHG-2#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 48V conversion, military avionics holdup, and telecom RRU applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3897EUHG-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 industrial, automotive, communications, and healthcare markets.
The LTC3897EUHG-2#TRPBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC controllers, designed specifically for ruggedized power conversion in automotive, aerospace, and industrial systems where input transients, reverse polarity, and efficiency at light loads are critical.
FAQ
What is the maximum input voltage rating for the LTC3897EUHG-2#TRPBF?
The LTC3897EUHG-2#TRPBF supports a continuous input voltage range of 4.5V to 65V and is rated to withstand transient voltages up to 75V on the VIN pin. This makes the LTC3897EUHG-2#TRPBF suitable for automotive battery systems experiencing load dump events per ISO 7637-2, as well as industrial 48V DC distribution networks with high-energy surges.
Does the LTC3897EUHG-2#TRPBF integrate both surge protection and ideal diode functionality?
Yes, the LTC3897EUHG-2#TRPBF integrates two independent protection blocks: a surge stopper (controlled via SG pin) that regulates an external N-MOSFET for overvoltage, overcurrent, and inrush protection; and an ideal diode controller (controlled via DG pin) that replaces a Schottky diode for reverse-input protection and voltage holdup. Both functions operate simultaneously and are fully configurable via dedicated pins.
How is the gate drive voltage configured on the LTC3897EUHG-2#TRPBF?
The LTC3897EUHG-2#TRPBF uses OPTI-DRIVE technology: the DRVSET pin sets the regulated DRVCC output voltage. Tying DRVSET to GND yields 6.0V; to INTVCC yields 10.0V; or using a 50kΩ–100kΩ resistor to GND programs intermediate values (e.g., 6.4V, 7.0V, 7.6V, or 9.0V). This eliminates external gate driver supplies and supports both logic-level and standard-threshold N-MOSFETs.
What package type and thermal characteristics does the LTC3897EUHG-2#TRPBF use?
The LTC3897EUHG-2#TRPBF is housed in a 44-lead plastic QFN (UHG) package measuring 5mm × 9mm with an exposed GND pad. Its thermal resistance is θJA = 36°C/W when mounted on a standard 4-layer PCB with adequate copper pour. The package features high-voltage pin spacing to support 75V transients without creepage/clearance issues.
Can the LTC3897EUHG-2#TRPBF be synchronized to an external clock?
Yes, the LTC3897EUHG-2#TRPBF supports external synchronization via the PLLIN/MODE pin. When driven by an external clock signal (75kHz–550kHz), the internal phase-locked loop aligns the rising edge of BG1 with the external clock's rising edge. This enables deterministic multi-phase operation across multiple LTC3897EUHG-2#TRPBF devices in stacked or paralleled configurations.
LTC3897EUHG-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)
LTC3897EUHG-2#TRPBF FAQ
1.How can I place an order for LTC3897EUHG-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3897EUHG-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 LTC3897EUHG-2#TRPBF reliable?
The price and inventory of LTC3897EUHG-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 LTC3897EUHG-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3897EUHG-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3897EUHG-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3897EUHG-2#TRPBF?
LTC3897EUHG-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3897EUHG-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 LTC3897EUHG-2#TRPBF?
For technical support, including LTC3897EUHG-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3897EUHG-2#TRPBF requirements.
6.How does Aetrix verify that LTC3897EUHG-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3897EUHG-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 LTC3897EUHG-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3897EUHG-2#TRPBF?
All LTC3897EUHG-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3897EUHG-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 LTC3897EUHG-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3897EUHG-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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