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Analog Devices Inc. LTC7801IUFD#PBF
- Part No.:
- LTC7801IUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC7801IUFD#PBF.pdf
- Description:
- IC REG CTRLR SYNC BUCK 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:251
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Product details
Overview
LTC7801IUFD#PBF from Analog Devices is a high-voltage, low-quiescent-current synchronous step-down DC/DC controller driving all-N-channel MOSFETs with input voltage support up to 140V, 0.8V–60V programmable output, and 40μA no-load IQ. It features OPTI-LOOP® compensation, phase-lockable 75kHz–850kHz switching, and 100% duty cycle operation via integrated charge pump - enabling use in high-voltage battery systems and telecom power supplies.
For engineers reviewing the LTC7801IUFD#PBF datasheet, LTC7801IUFD#PBF pinout, LTC7801IUFD#PBF application, or LTC7801IUFD#PBF equivalent, key selection considerations include its 24-pin 4mm × 5mm QFN package, dual LDO options for DRVCC (VIN/NDRV/EXTVCC), selectable gate drive UVLO thresholds, and Burst Mode®/pulse-skipping/forced continuous light-load operation modes.
Technical Context
The LTC7801IUFD#PBF implements a constant-frequency current-mode control architecture with an internal transconductance error amplifier (gm = 2 mmho), precision 0.8V reference (±0.8% over temperature), and differential current-sense comparator with 66–84mV max threshold. Its phase-locked loop accepts external clocks from 75kHz to 850kHz and supports synchronization without mode disruption.
It integrates three independent DRVCC regulation paths - internal VIN-based LDO, external NMOS NDRV LDO, and EXTVCC-powered LDO - with switchover thresholds programmable via DRVUV pin (4.7V/7.7V). Gate drive logic includes programmable TG/BG on-resistance (2.2Ω/2.0Ω pull-up), <80ns minimum top-gate on-time, and built-in bootstrap switch eliminating external diode requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports wide-range industrial and battery inputs including 48V, 72V, and 100V bus systems. |
| Output Voltage Range | 0.8V to 60V - set via external resistor divider on VFB; enables single-controller flexibility across 3.3V, 5V, 12V, 24V, and 48V rails. |
| No-Load Quiescent Current | 40μA - extends runtime in always-on battery-powered applications such as remote sensors and backup power modules. |
| Switching Frequency Range | 75kHz to 850kHz - phase-lockable to external clock or programmable via FREQ pin resistor; allows EMI optimization and inductor size reduction. |
| Gate Drive Voltage Range | 5V to 10V - adjustable via DRVSET pin resistor (50k–90kΩ); matches logic-level or standard-threshold MOSFETs for peak efficiency. |
| Duty Cycle Capability | 100% - enabled by integrated charge pump (CPUMP_EN) and eliminates dropout limitation in high-VIN-to-low-VOUT conversion. |
| Package & Thermal | 24-pin 4mm × 5mm QFN with exposed pad - θJA = 43°C/W; requires soldered GND pad for rated electrical performance and thermal dissipation. |
Pinout & Package
Package: 24-lead (4mm × 5mm) plastic QFN with exposed thermal pad (Pin 25 = GND). Must be soldered to PCB ground plane for rated electrical and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 17) | Main input supply connection | Accepts 4V–140V input; bypass capacitor required between VIN and GND for stability and noise suppression. |
| TG (Pin 13) | Top gate driver output | Floating high-side driver with DRVCC-referenced swing; drives external high-side N-MOSFET gate. |
| SW (Pin 14) | Switch node | Connects to inductor and source of bottom MOSFET; critical for layout due to high dv/dt switching node. |
| BG (Pin 16) | Bottom gate driver output | Ground-referenced driver for synchronous rectifier N-MOSFET; complements TG for efficient buck topology. |
| BOOST (Pin 15) | Bootstrap supply node | Capacitor-connected to SW; provides floating bias for TG driver; voltage swing = DRVCC to (VIN + DRVCC). |
| SENSE+ / SENSE– (Pins 22/23) | Differential current sense inputs | Monitor inductor current via external sense resistor; enable accurate peak-current limiting and cycle-by-cycle protection. |
| VFB (Pin 1) | Feedback input | Compares divided output voltage against 0.8V internal reference; sets regulated output voltage with ±0.8% accuracy. |
| ITH (Pin 2) | Error amplifier output | Controls current comparator trip point; used for loop compensation and transient response tuning via OPTI-LOOP®. |
| RUN (Pin 19) | Enable/shutdown control | 1.12V ON threshold; 0.7V deep shutdown (10μA IQ); supports sequencing and system-level power management. |
| PGOOD (Pin 9) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from setpoint; enables downstream power sequencing and fault reporting. |
| DRVCC (Pin 17) | Gate driver supply output | Regulated output (5V–10V) powering TG/BG drivers; sourced from VIN, NDRV, or EXTVCC LDOs depending on configuration. |
| EXTVCC (Pin 18) | External driver supply input | Enables DRVCC sourcing from external rail (7V–13V); activates switchover at 4.7V/7.7V based on DRVUV setting. |
| NDRV (Pin 16) | External NMOS pass device driver | Drives gate of external NFET for low-dropout DRVCC generation from VIN; disabled when tied to DRVCC. |
| CPUMP_EN (Pin 7) | Charge pump enable | INTVCC = 100% duty cycle; GND = 99% duty cycle; essential for ultra-low-VOUT operation in dropout condition. |
| MODE (Pin 5) | Light-load operation mode select | GND = Burst Mode®; 0.5V–1.0V = adjustable burst clamp; INTVCC = forced continuous; >1.4V = pulse-skipping. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide range of output capacitance (10µF–1000µF) and ESR values without external compensation redesign. |
| Programmable DRVCC Regulation | Set to 5V–10V via single resistor on DRVSET pin - optimizes gate drive strength and conduction loss for specific MOSFET RDS(on). |
| No External Bootstrap Diode Required | Integrated high-side switch in TG driver eliminates discrete diode, reducing BOM count and improving reliability in high-temp environments. |
| Selectable Light-Load Operation | Three distinct modes - Burst Mode® (lowest IQ), pulse-skipping (low ripple), or forced continuous (best noise performance) - configurable per application need. |
| Input Overvoltage Lockout (OVLO) | Programmable 1.1V–1.3V threshold on OVLO pin - protects downstream circuitry during input surges without disabling bias supplies. |
| Multiple DRVCC Supply Options | Three independent LDO sources (VIN, NDRV, EXTVCC) with automatic switchover - ensures robust gate drive under varying input and load conditions. |
Applications
| Industrial High-Voltage Power Supply | Telecom 48V Intermediate Bus Converter |
|---|---|
|
Use Scenario: Converting 100V DC input from rectified AC or PoE++ infrastructure to regulated 12V for baseband processing units. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing 5A output with 85%+ efficiency at full load and 40μA quiescent draw at no load. Use Value: Enables compact, thermally efficient design using 4mm × 5mm QFN package and eliminates need for external bootstrap diode or charge pump IC. |
Use Scenario: Stepping down 48V telecom intermediate bus to 3.3V/5V for FPGA, DSP, and interface ICs in wireless base stations. IC Role / Device Role / Timing Role: High-efficiency current-mode controller supporting phase-locking to system clock for EMI reduction and deterministic timing alignment. Use Value: Delivers >92% efficiency at 2A load while maintaining <10mV output ripple via OPTI-LOOP®-tuned compensation and selectable light-load mode. |
| Automotive Battery Management System | High-Voltage IoT Sensor Node Power |
|
Use Scenario: Regulating 72V traction battery auxiliary rail to 5V for MCU, CAN transceiver, and analog front-end in EV battery packs. IC Role / Device Role / Timing Role: Robust controller with –40°C to 125°C operating range, input OVLO, and precise 0.8V reference for stable microcontroller supply under wide temperature swings. Use Value: Ensures reliable startup and operation across cold-crank (4V) to load-dump (140V) conditions while maintaining 10μA shutdown current. |
Use Scenario: Powering long-life LPWAN sensor nodes powered by 60V solar-charged LiFePO₄ stacks, requiring multi-year battery life. IC Role / Device Role / Timing Role: Ultra-low-IQ buck controller enabling >10-year runtime via 40μA no-load IQ and programmable Burst Mode® clamp. Use Value: Extends operational lifetime by minimizing standby losses while retaining fast wake-up response through optimized soft-start and PGOOD signaling. |
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 |
|---|---|---|---|
| LT8390AEMSE#PBF | Higher 60V max VIN, integrated 6A power switches, fixed 2.2MHz frequency, no EXTVCC option. | Targets lower-voltage, higher-integration designs where board space is constrained and 140V input not required. | Choose LT8390A when integrating power stages saves layout complexity and 60V input suffices; avoid for >60V or 100% duty cycle needs. |
| MPQ4316-AEC1-P | Automotive-grade (AEC-Q100), 60V max VIN, 3.5A integrated FETs, fixed 2.2MHz, no programmable DRVCC or CPUMP_EN. | Suitable for automotive infotainment and ADAS subsystems needing AEC-Q100 qualification but limited to ≤60V input. | Choose MPQ4316-AEC1-P only for AEC-Q100-compliant 12V/24V systems; LTC7801IUFD#PBF remains preferred for >60V, programmability, and thermal ruggedness. |
Compared with LT8390AEMSE#PBF and MPQ4316-AEC1-P, the LTC7801IUFD#PBF uniquely supports 140V input, 100% duty cycle, and triple-source DRVCC regulation - making it irreplaceable for high-input-voltage industrial and telecom power conversion where flexibility and ruggedness are non-negotiable.
Availability
LTC7801IUFD#PBF is available at Aetrix Electronics and suitable for industrial power systems, telecom infrastructure, and high-voltage battery-operated systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC7801IUFD#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7801IUFD#PBF belongs to Analog Devices' Power by Linear™ high-voltage controller product line, engineered specifically for robust, efficient, and flexible DC/DC conversion in harsh-input environments where reliability and wide operating range are critical.
FAQ
What is the maximum input voltage rating for the LTC7801IUFD#PBF?
The LTC7801IUFD#PBF has an absolute maximum input voltage rating of 150V, with a specified operating range of 4V to 140V. This makes the LTC7801IUFD#PBF suitable for high-voltage industrial and telecom applications where input transients or wide bus ranges must be accommodated without derating.
Does the LTC7801IUFD#PBF support 100% duty cycle operation, and how is it enabled?
Yes, the LTC7801IUFD#PBF supports true 100% duty cycle operation via its integrated charge pump. To enable it, the CPUMP_EN pin (Pin 7) must be tied to INTVCC. When CPUMP_EN is grounded, the device defaults to 99% duty cycle. This capability is essential for high-input-to-low-output voltage conversion in dropout conditions.
How is the gate drive voltage (DRVCC) programmed on the LTC7801IUFD#PBF?
The LTC7801IUFD#PBF allows precise programming of DRVCC from 5V to 10V using a single resistor between the DRVSET pin (Pin 9) and GND. For example, a 70kΩ resistor sets DRVCC to 7.0V. This adjustment directly impacts MOSFET switching losses and conduction efficiency, enabling optimization for specific FET characteristics.
What are the supported light-load operating modes of the LTC7801IUFD#PBF, and how are they selected?
The LTC7801IUFD#PBF offers three light-load modes: Burst Mode® (lowest IQ), pulse-skipping (low output ripple), and forced continuous (best noise performance). Selection is made via the MODE pin (Pin 5): GND = Burst Mode®, 0.5V–1.0V = adjustable burst clamp, INTVCC = forced continuous, >1.4V = pulse-skipping. Each mode preserves regulation integrity while optimizing trade-offs.
Can the LTC7801IUFD#PBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC7801IUFD#PBF supports external synchronization via the PLLIN pin (Pin 6). It accepts external clock signals from 75kHz to 850kHz and maintains the selected light-load mode (Burst, pulse-skipping, or forced continuous) during synchronization - ensuring deterministic timing and EMI control without compromising efficiency or regulation.
LTC7801IUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- 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 ~ 140V
- Frequency - Switching:
- 50kHz ~ 900kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x5)
LTC7801IUFD#PBF FAQ
1.How can I place an order for LTC7801IUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7801IUFD#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 LTC7801IUFD#PBF reliable?
The price and inventory of LTC7801IUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7801IUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC7801IUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7801IUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7801IUFD#PBF?
LTC7801IUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7801IUFD#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 LTC7801IUFD#PBF?
For technical support, including LTC7801IUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7801IUFD#PBF requirements.
6.How does Aetrix verify that LTC7801IUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7801IUFD#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 LTC7801IUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC7801IUFD#PBF?
All LTC7801IUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7801IUFD#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 LTC7801IUFD#PBF part is unused and in its original packaging.
Return procedure for LTC7801IUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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