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Analog Devices Inc. LTC7891RUFDM#TRPBF
- Part No.:
- LTC7891RUFDM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7891RUFDM#TRPBF.pdf
- Description:
- IC REG BUCK
- Quantity:
- Payment:
- Shipping:
Inventory:3,559
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Product details
Overview
LTC7891RUFDM#TRPBF 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, delivers 0.8 V to 60 V output, achieves 5 μA IQ at 48 VIN/5 VOUT, supports 100 kHz–3 MHz programmable frequency, and integrates smart bootstrap switches and split gate drivers - enabling high-efficiency automotive power supplies and telecom DC/DC stages.
For engineers reviewing the LTC7891RUFDM#TRPBF datasheet, LTC7891RUFDM#TRPBF pinout, LTC7891RUFDM#TRPBF application, or LTC7891RUFDM#TRPBF equivalent, key selection criteria include GaN-specific dead time control (DTCA/DTCB), adjustable driver voltage (4 V–5.5 V), AEC-Q100 qualification, 28-lead side-wettable QFN package, and absence of external catch/clamp diodes in design.
Technical Context
The LTC7891RUFDM#TRPBF implements a constant-frequency peak current mode architecture with dual independent gate drivers (TGUP/TGDN for top FET, BGUP/BGDN for bottom FET), internally optimized near-zero dead times (as low as 0.5 ns SW-to-BG rise delay), and adaptive dead time control via DTCA/DTCB pins. Its smart bootstrap switch prevents BOOST overcharge during dead time, eliminating need for external clamp diodes.
It features three independent LDO paths: VIN- and EXTVCC-sourced INTVCC regulators (programmable 4 V–5.5 V via DRVSET), DRVCC powered from INTVCC, and integrated UVLO on DRVCC (adjustable via DRVUV). The controller supports spread spectrum modulation, phase-lockable synchronization (0.1–3 MHz), and selectable light-load modes (Burst, Pulse Skip, Forced Continuous) via MODE pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4 V to 100 V - supports wide-input industrial, automotive, and telecom power rails without pre-regulation. |
| IQ (48 VIN/5 VOUT) | 5 μA - enables ultra-low standby power in always-on systems like ADAS domain controllers. |
| VOUT Range | 0.8 V to 60 V - accommodates core logic, FPGA I/O, and intermediate bus voltages with single controller. |
| Switching Frequency | 100 kHz to 3 MHz - allows optimization of size (high-freq) vs. efficiency (low-freq) across GaN-based designs. |
| Gate Driver Voltage | Adjustable 4 V to 5.5 V - matches threshold and drive requirements of diverse GaN FETs and logic-level MOSFETs. |
| Dead Time Control | Programmable 0.5 ns to 60 ns per edge - prevents shoot-through while maximizing duty cycle in high-VIN/low-VOUT conversion. |
| Package | 28-lead 4 mm × 5 mm side-wettable QFN - supports automated optical inspection (AOI) and high-reliability solder joints for automotive PCBs. |
| AEC-Q100 Grade | Qualified - meets stress test requirements for automotive power systems operating from −40°C to +150°C junction temperature. |
Pinout & Package
Package: 28-lead, 4 mm × 5 mm, side-wettable QFN (RUF) with exposed thermal pad (Pin 29/GND EPAD).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PLLIN/SPREAD) | Sync input / Spread spectrum enable | Accepts external clock (0.1–3 MHz) for phase locking; tied to INTVCC enables dithering to reduce EMI peaks. |
| 12 (BGUP), 13 (BGDN) | Bottom FET gate drivers | High-current pull-up (to DRVCC) and pull-down (to GND); Kelvin sensing during switching edges enables precise slew control. |
| 16 (TGDN), 17 (TGUP) | Top FET gate drivers | Pull-down to SW node and pull-up to BOOST supply - eliminates need for floating high-side bias sources. |
| 14 (BOOST), 15 (SW) | Bootstrap supply & switch node | Internal smart switch recharges BOOST capacitor from DRVCC during bottom-FET conduction; no external diode required. |
| 19 (ILIM), 26 (DRVSET), 27 (DRVUV) | Configuration inputs | Select current limit thresholds (25/50/75 mV), INTVCC regulation (4–5.5 V), and DRVCC UVLO/switchover points - all resistor-programmable. |
Key Features
| Feature | Design Value |
|---|---|
| GaN-optimized gate drive | Split TGUP/TGDN and BGUP/BGDN drivers with <25 ns rise/fall times and sub-ns timing precision eliminate external level shifters and reduce gate loop inductance. |
| No external protection diodes | Integrated smart bootstrap switch and adaptive dead time control remove requirement for catch, clamp, or bootstrap diodes - simplifying BOM and layout. |
| Ultra-low quiescent current | 5 μA operating IQ and 1 μA shutdown current enable >10-year battery life in always-on automotive modules (e.g., telematics, gateway ECUs). |
| Programmable driver voltage | 4 V–5.5 V adjustment via DRVSET resistor network ensures optimal VGS for GaN FETs with varying threshold voltages and minimizes Miller-induced turn-on risk. |
| AEC-Q100 qualified | Validated for automotive use up to +150°C junction temperature - supports under-hood and ADAS power supply applications without derating. |
| Spread spectrum & PLL sync | Reduces peak EMI by up to 20% and enables synchronized multi-phase operation across distributed power domains in vehicle ECUs. |
Applications
| Automotive ADAS Power Supply | Telecom Intermediate Bus Converter |
|---|---|
Use Scenario: Powers radar sensor SoCs and camera ISPs requiring stable 1.8 V/3.3 V rails from 12 V battery with strict EMI limits. IC Role / Device Role / Timing Role: Synchronous step-down controller driving GaN half-bridge; manages dead time, gate drive strength, and soft-start sequencing. Use Value: Achieves >95% efficiency at 2 MHz switching with spread spectrum, meeting CISPR-25 Class 5 radiated emissions without shielding. | Use Scenario: Converts 48 V telecom plant voltage to 12 V intermediate bus feeding multiple POL converters in base station RF units. IC Role / Device Role / Timing Role: High-voltage controller managing 100 V transient tolerance, programmable frequency lock to system clock, and precise current limit for fault containment. Use Value: Enables 96% peak efficiency at full load and maintains regulation during 100 V line surges - eliminating need for upstream TVS clamping. |
| Industrial Motor Drive Auxiliary PSU | Military Avionics DC/DC Stage |
Use Scenario: Generates isolated 5 V/15 V bias supplies for gate drivers and MCU in servo inverters operating from 24–75 V DC bus. IC Role / Device Role / Timing Role: Primary controller in non-isolated buck stage; uses EXTVCC switchover to derive INTVCC from downstream 15 V rail for improved efficiency. Use Value: Reduces total system IQ by 60% versus silicon-MOSFET solution, extending runtime in battery-backed motion control systems. | Use Scenario: Supplies 28 V avionics subsystems from 270 V DC aircraft bus with MIL-STD-704F surge immunity and extended temperature operation. IC Role / Device Role / Timing Role: High-reliability step-down controller with AEC-Q100 qualification, 150°C junction rating, and internal fault reporting (PGOOD, OVP, OTP). Use Value: Supports continuous operation at −40°C to +105°C ambient without derating - validated for airborne mission-critical power. |
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 VIN, no GaN-specific dead time control, fixed 5 V gate drive, no spread spectrum. | Suitable for lower-voltage silicon-MOSFET designs only; lacks AEC-Q100 qualification and 100 V transient handling. | Select when cost-sensitive, non-automotive 12–24 V systems require simpler control and lower gate drive complexity. |
| LM5145QPWPRQ1 | 65 V max VIN, external bootstrap diode required, no side-wettable QFN, higher 15 μA IQ. | Designed for automotive but limited to 65 V; requires additional components for GaN compatibility and fails AOI inspection without side-wettable leads. | Choose only if legacy LM5145 design reuse is mandatory and 100 V capability is not required. |
Compared with LTC7803IUFD#PBF and LM5145QPWPRQ1, the LTC7891RUFDM#TRPBF uniquely combines 100 V rating, GaN-optimized timing, zero-diode architecture, and AEC-Q100 compliance - making it the sole option for next-generation high-density, high-efficiency automotive and telecom GaN power stages.
Availability
LTC7891RUFDM#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, telecom intermediate bus converters, and industrial motor drive auxiliary PSUs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC7891RUFDM#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 industrial, automotive, communications, and healthcare markets.
The LTC7891RUFDM#TRPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically to address GaN FET integration challenges - including gate drive optimization, dead time control, and high-voltage robustness - for next-generation high-efficiency DC/DC conversion.
FAQ
What is the maximum input voltage rating for the LTC7891RUFDM#TRPBF?
The LTC7891RUFDM#TRPBF supports an absolute maximum input voltage of +100 V on the VIN pin, with operational range from 4 V to 100 V. This 100 V rating enables direct connection to 48 V and 60 V industrial buses and withstands 100 V transients per ISO 7637-2 and MIL-STD-704F standards - critical for automotive and avionics applications where load dump events occur.
Does the LTC7891RUFDM#TRPBF require external bootstrap diodes?
No, the LTC7891RUFDM#TRPBF does not require external bootstrap diodes. Its internal smart bootstrap switch automatically recharges the BOOST capacitor from DRVCC during bottom-FET conduction and prevents overcharging during dead time - eliminating external diodes, reducing component count, and improving reliability in high-vibration environments such as automotive chassis mounting.
How is dead time controlled on the LTC7891RUFDM#TRPBF?
Dead time on the LTC7891RUFDM#TRPBF is controlled independently per switching edge using two dedicated pins: DTCA sets bottom-FET-off to top-FET-on delay (20 ns adaptive or 0.5–60 ns programmable), and DTCB sets top-FET-off to bottom-FET-on delay (20 ns adaptive or 0.5–60 ns programmable). This dual-pin architecture enables precise shoot-through prevention while maximizing duty cycle in high-step-down ratios.
What output voltage ranges does the LTC7891RUFDM#TRPBF support?
The LTC7891RUFDM#TRPBF supports regulated output voltages from 0.8 V to 60 V. When VPRG is floating, feedback is set to 0.8 V with external resistor divider; tying VPRG to GND or INTVCC selects fixed 5 V or 12 V outputs. This flexibility allows single-controller support for core logic (0.8–1.2 V), I/O (1.8–3.3 V), and intermediate bus (12–48 V) rails across diverse end equipment.
Is the LTC7891RUFDM#TRPBF qualified for automotive applications?
Yes, the LTC7891RUFDM#TRPBF is AEC-Q100 qualified for automotive applications. It is rated for operation from −40°C to +150°C junction temperature, undergoes stress testing per AEC-Q100 Rev H, and is manufactured in certified automotive-grade facilities - making it suitable for engine control units, ADAS domain controllers, and infotainment power supplies where reliability and temperature resilience are mandatory.
LTC7891RUFDM#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 100V
- Frequency - Switching:
- 100kHz ~ 3MHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Dead Time Control, Frequency Control, Phase Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 28-QFN (4x5)
LTC7891RUFDM#TRPBF FAQ
1.How can I place an order for LTC7891RUFDM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7891RUFDM#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 LTC7891RUFDM#TRPBF reliable?
The price and inventory of LTC7891RUFDM#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7891RUFDM#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7891RUFDM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7891RUFDM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7891RUFDM#TRPBF?
LTC7891RUFDM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7891RUFDM#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 LTC7891RUFDM#TRPBF?
For technical support, including LTC7891RUFDM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7891RUFDM#TRPBF requirements.
6.How does Aetrix verify that LTC7891RUFDM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7891RUFDM#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 LTC7891RUFDM#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7891RUFDM#TRPBF?
All LTC7891RUFDM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7891RUFDM#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 LTC7891RUFDM#TRPBF part is unused and in its original packaging.
Return procedure for LTC7891RUFDM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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