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Analog Devices Inc. LTC7891RUFDM#PBF
- Part No.:
- LTC7891RUFDM#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
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- Datasheet:
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LTC7891RUFDM#PBF.pdf
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- IC REG BUCK
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Product details
Overview
LTC7891RUFDM#PBF from Analog Devices is a 100 V, low-quiescent-current synchronous step-down controller optimized for gallium nitride (GaN) FETs. It operates from 4 V to 100 V input, regulates output from 0.8 V to 60 V, delivers programmable switching frequency up to 3 MHz, and achieves 5 μA quiescent current at 48 VIN/5 VOUT. It enables high-efficiency, high-frequency power conversion in automotive DC/DC systems.
For engineers reviewing the LTC7891RUFDM#PBF datasheet, LTC7891RUFDM#PBF pinout, LTC7891RUFDM#PBF application, or LTC7891RUFDM#PBF equivalent, key selection criteria include GaN-optimized gate drive timing, smart near-zero dead time control, split gate drivers with adjustable strength, precise 4–5.5 V driver voltage programming, and AEC-Q100 qualification for automotive reliability.
Technical Context
The LTC7891RUFDM#PBF implements a constant-frequency peak current mode control architecture with dual independent gate drivers: TGUP/TGDN for the high-side GaN FET and BGUP/BGDN for the low-side GaN FET. Its internal smart bootstrap switch prevents BOOST overcharging during dead time, eliminating external clamp diodes.
Dead time is internally optimized to near-zero (as low as 0.5 ns SW-to-BG rise delay) or externally resistor-adjustable from 7 ns to 60 ns via DTCA and DTCB pins. The controller supports phase-lockable frequency synchronization (0.1–3 MHz), spread-spectrum modulation, and three light-load modes (Burst, Pulse Skip, Forced Continuous) selectable via the MODE pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4 V to 100 V - supports wide-input industrial and automotive battery systems including 48 V architectures and transient-tolerant 12 V/24 V rails. |
| VOUT Range | 0.8 V to 60 V - enables direct regulation of intermediate bus voltages (e.g., 3.3 V, 5 V, 12 V) or high-voltage auxiliary supplies without post-regulation stages. |
| IQ (Regulation) | 5 μA at 48 VIN/5 VOUT - enables ultra-low standby power in always-on automotive modules such as ADAS domain controllers and telematics units. |
| Switching Frequency | 100 kHz to 3 MHz - allows optimization for size (high-freq) or EMI (low-freq), with PLL synchronization to system clocks for deterministic noise management. |
| Gate Driver Voltage | Adjustable 4 V to 5.5 V - matches threshold and Miller plateau requirements of diverse GaN FETs (e.g., EPC, Transphorm) and logic-level Si MOSFETs. |
| Dead Time Control | Smart near-zero (≤2 ns) or resistor-programmable (7–60 ns) - prevents shoot-through while maximizing duty cycle and efficiency at high input voltages. |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev H, Grade 1 (−40°C to +125°C ambient) - validated for under-hood automotive applications including engine control and infotainment power supplies. |
Pinout & Package
Package: 28-lead, 4 mm × 5 mm side-wettable QFN (RUF) with exposed thermal pad (EPAD). RoHS-compliant, halogen-free, and qualified for automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PLLIN/SPREAD) | Phase detector input / Spread spectrum enable | Accepts external clock (0.1–3 MHz) for synchronization; tied to INTVCC enables dithering to reduce EMI peaks. |
| 12 (BGUP), 13 (BGDN) | Bottom FET gate pull-up/pull-down drivers | High-current (2 Ω pull-up, 1 Ω pull-down) outputs with Kelvin sensing capability for accurate gate turn-on/off control. |
| 16 (TGDN), 17 (TGUP) | Top FET gate pull-down/pull-up drivers | SW-referenced pull-down and BOOST-referenced pull-up enable floating high-side drive without external level shifters. |
| 14 (BOOST), 15 (SW) | Bootstrap supply node / Switch node | Internal smart bootstrap switch charges BOOST from DRVCC during bottom-FET conduction; SW connects to inductor and high-side FET source. |
| 19 (ILIM), 24 (DTCB), 25 (DTCA) | Current limit threshold / Dead time control | Three-pin configuration sets max sense voltage (25/50/75 mV) and fine-tunes top/bottom FET dead times independently for GaN-specific timing margins. |
| 26 (DRVSET), 27 (DRVUV) | INTVCC regulation / UVLO programming | Resistor-programmable LDO output (4–5.5 V) and configurable undervoltage lockout thresholds ensure stable gate driver bias across temperature and input transients. |
Key Features
| Feature | Design Value |
|---|---|
| GaN-optimized gate drive | Split TGUP/TGDN and BGUP/BGDN drivers with <25 ns rise/fall times and sub-2 ns SW-to-BG timing minimize switching losses in GaN-based converters. |
| No external protection diodes | Integrated smart bootstrap switch and adaptive dead time eliminate need for catch, clamp, or bootstrap diodes-reducing BOM count and layout complexity. |
| Programmable driver voltage | 4 V to 5.5 V adjustment via DRVSET enables optimal gate overdrive for different GaN FETs (e.g., 4.5 V for EPC2065, 5.2 V for TPH3205WS) |
| Low-IQ sleep mode | 1 µA shutdown current and 5 µA regulation current extend battery life in always-on automotive subsystems such as CAN FD gateways and radar sensors. |
| Spread spectrum & PLL sync | Reduces peak EMI by >10 dB and enables deterministic noise placement when synchronized to master system clocks in multi-rail power domains. |
Applications
| Automotive ADAS Power Supply | Industrial 48 V Telecom PSU |
|---|---|
Use Scenario: Powers vision processing unit (VPU) and radar SoC in autonomous driving ECUs requiring clean, efficient 12 V/3.3 V rails from 12 V or 48 V battery. IC Role / Device Role / Timing Role: Primary step-down controller managing high-side GaN FET switching at 1.2 MHz with synchronized spread spectrum to meet CISPR-25 Class 5 EMI limits. Use Value: Achieves >95% efficiency at 10 A load and eliminates external bootstrap diodes-reducing solution size by 35% vs. silicon-based controllers. | Use Scenario: Generates isolated 48 V intermediate bus from rectified AC line in telecom base station power shelves. IC Role / Device Role / Timing Role: High-voltage buck controller operating at 300 kHz with phase-locked operation to system clock for coherent ripple cancellation across multiple parallel converters. Use Value: Supports 100 V input transients and delivers 5 μA IQ in standby-enabling Energy Star Tier 2 compliance and reduced cooling requirements. |
| Medical Imaging DC/DC Module | Military Avionics Power Converter |
Use Scenario: Supplies FPGA and ADC bias rails in portable ultrasound equipment where low EMI and high reliability are critical. IC Role / Device Role / Timing Role: Synchronous buck controller with Burst Mode operation and 0.8 V reference accuracy (±1%) ensuring stable analog supply under dynamic imaging loads. Use Value: Maintains ±10 mV output regulation over −40°C to +85°C and meets IEC 60601-1 leakage current requirements via ultra-low IQ. | Use Scenario: Provides regulated 28 V and 5 V outputs in airborne mission computers exposed to MIL-STD-704E voltage transients. IC Role / Device Role / Timing Role: AEC-Q100 qualified controller operating from 16–40 V input with 99% max duty cycle dropout recovery and robust UVLO hysteresis (120 mV). Use Value: Survives 100 V/50 ms transients without latch-off and sustains operation down to −55°C ambient via extended junction temperature rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7803IUFD#PBF | 40 V max input, no GaN-specific drive optimization, fixed 5 V gate drive, no spread spectrum | Suitable for lower-voltage Si MOSFET designs only; lacks AEC-Q100 qualification and smart dead time | Select when cost-sensitive 40 V applications do not require GaN efficiency or automotive qualification. |
| LM5143ARGYR | 65 V max input, dual-channel, integrated high-side driver, no programmable gate voltage or AEC-Q100 rating | Targeted at dual-output industrial SMPS; requires external bootstrap diode and offers no spread spectrum or PLL sync | Choose for space-constrained dual-rail designs where GaN performance and automotive compliance are secondary. |
Compared with LTC7803IUFD#PBF and LM5143ARGYR, the LTC7891RUFDM#PBF uniquely combines 100 V operation, GaN-optimized gate drive timing, AEC-Q100 qualification, and spread-spectrum EMI reduction-making it the only option for high-reliability, high-efficiency automotive GaN power supplies.
Availability
LTC7891RUFDM#PBF is available at Aetrix Electronics and suitable for automotive ADAS systems, industrial 48 V telecom infrastructure, and military avionics requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC7891RUFDM#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and automotive markets since 1965.
The LTC7891 product line was designed specifically to address GaN FET adoption barriers in high-voltage DC/DC conversion-delivering integrated bootstrap management, zero-dead-time control, and automotive-grade reliability without external components.
FAQ
What is the maximum input voltage rating for the LTC7891RUFDM#PBF?
The LTC7891RUFDM#PBF has an absolute maximum input voltage rating of +100 V on the VIN pin, with guaranteed operational performance from 4 V to 100 V. This enables use in 48 V automotive systems, industrial 24–72 V rails, and telecom rectified inputs while surviving ISO 7637-2 pulse 5a transients up to 100 V/50 ms without damage or latch-up.
Does the LTC7891RUFDM#PBF require external bootstrap diodes?
No, the LTC7891RUFDM#PBF does not require external bootstrap diodes. Its internal smart bootstrap switch automatically manages BOOST capacitor charging during bottom-FET conduction and prevents overcharging during dead time by disconnecting DRVCC from BOOST when SW rings below ground-eliminating shoot-through risk and reducing BOM count.
How is dead time controlled on the LTC7891RUFDM#PBF?
Dead time on the LTC7891RUFDM#PBF is controlled via two dedicated pins: DTCA sets bottom-FET-off-to-top-FET-on delay, and DTCB sets top-FET-off-to-bottom-FET-on delay. Each pin supports GND (adaptive ~20 ns), INTVCC (smart near-zero ≤2 ns), or resistor programming (7–60 ns), enabling precise GaN timing margining without firmware or external logic.
What package type is used for the LTC7891RUFDM#PBF?
The LTC7891RUFDM#PBF uses a 28-lead, 4 mm × 5 mm side-wettable QFN package (RUF). This package features an exposed thermal pad (EPAD) for enhanced thermal dissipation and is compatible with automated optical inspection (AOI) due to side-wettable flanks-critical for high-reliability automotive PCB assembly.
Is the LTC7891RUFDM#PBF qualified for automotive applications?
Yes, the LTC7891RUFDM#PBF is AEC-Q100 qualified for automotive applications (Grade 1, −40°C to +125°C ambient). It undergoes stress testing for temperature cycling, humidity, mechanical shock, and ESD per Rev H requirements-ensuring reliability in engine control units, ADAS cameras, and infotainment power supplies.
LTC7891RUFDM#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- -
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- Topology:
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- Output Type:
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- Voltage - Input (Min):
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- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
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- Supplier Device Package:
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LTC7891RUFDM#PBF FAQ
1.How can I place an order for LTC7891RUFDM#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7891RUFDM#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 LTC7891RUFDM#PBF reliable?
The price and inventory of LTC7891RUFDM#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7891RUFDM#PBF is usually 5 days.
3.What payment methods are accepted for LTC7891RUFDM#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7891RUFDM#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7891RUFDM#PBF?
LTC7891RUFDM#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7891RUFDM#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 LTC7891RUFDM#PBF?
For technical support, including LTC7891RUFDM#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7891RUFDM#PBF requirements.
6.How does Aetrix verify that LTC7891RUFDM#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7891RUFDM#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 LTC7891RUFDM#PBF meets industry standards.
7.What is the process for return or replacement of LTC7891RUFDM#PBF?
All LTC7891RUFDM#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7891RUFDM#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 LTC7891RUFDM#PBF part is unused and in its original packaging.
Return procedure for LTC7891RUFDM#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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