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Analog Devices Inc. LTC7801HUFD#PBF
- Part No.:
- LTC7801HUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC7801HUFD#PBF.pdf
- Description:
- IC REG CTRLR SYNC BUCK 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:569
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Product details
Overview
LTC7801HUFD#PBF from Analog Devices is a high-voltage synchronous step-down DC/DC controller supporting input voltages up to 140V and output voltages from 0.8V to 60V. It drives all-N-channel MOSFETs with programmable gate drive (5V–10V), delivers 40μA no-load quiescent current, and enables 100% duty cycle operation via integrated charge pump - ideal for high-voltage battery systems and telecom power supplies.
For engineers reviewing the LTC7801HUFD#PBF datasheet, LTC7801HUFD#PBF pinout, LTC7801HUFD#PBF application, or LTC7801HUFD#PBF equivalent, key selection criteria include its 140V max VIN rating, OPTI-LOOP® compensation for wide-output-capacitance stability, phase-lockable 75kHz–850kHz switching frequency, and H-grade (–40°C to 150°C) operation in 4mm × 5mm QFN packaging.
Technical Context
The LTC7801HUFD#PBF implements a constant-frequency current-mode control architecture with dual-loop regulation: an inner current loop using differential SENSE+/SENSE– sensing and an outer voltage loop comparing VFB to a precision 0.8V reference. Its gate drivers feature matched rise/fall times (25ns/15ns), <55ns top-to-bottom dead time, and programmable UVLO thresholds via DRVUV pin.
It integrates three independent LDO paths for DRVCC: internal VIN-based, external EXTVCC-based (switchover at 4.7V/7.7V), and NDRV-driven NMOS pass device - enabling flexible high-efficiency biasing across wide input ranges. The CPUMP_EN pin controls charge pump activation for true 100% duty cycle in dropout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports wide-range industrial and battery inputs without pre-regulation. |
| Output Voltage Range | 0.8V to 60V - set via external resistor divider on VFB, enabling single-controller flexibility across multiple rail requirements. |
| Quiescent Current | 40μA (no load) - extends runtime in always-on battery-powered systems such as remote sensors or backup power modules. |
| Switching Frequency | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and compact magnetics design while maintaining synchronization with system clocks. |
| Gate Drive Voltage | Programmable 5V–10V (OPTI-DRIVE™) - matches logic-level or standard-level MOSFETs to minimize conduction losses and maximize efficiency. |
| Operating Temperature | –40°C to +150°C (H-grade) - qualified for under-hood automotive, industrial motor drives, and high-ambient telecom equipment. |
| Duty Cycle Support | 100% - enabled by internal charge pump, permitting VIN-to-VOUT regulation even during deep dropout (e.g., 12V out from 13V input). |
Pinout & Package
Package: 24-lead (4mm × 5mm) plastic QFN with exposed thermal pad (Pin 25 = GND). Requires soldering of exposed pad to PCB ground plane for rated electrical performance and θJA = 43°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 17) | Main input supply connection | Accepts 4V–140V; powers INTVCC LDO and enables DRVCC LDO paths - bypass capacitor required for stability. |
| TG (Pin 11) | Top gate driver output | Floating high-side driver with swing = DRVCC superimposed on SW node - drives external high-side N-MOSFET. |
| BG (Pin 14) | Bottom gate driver output | Ground-referenced driver (0V to DRVCC) - drives synchronous low-side N-MOSFET with matched timing to TG. |
| SENSE+ / SENSE– (Pins 22/23) | Differential current sense inputs | Enable accurate peak-current-mode control; tolerate common-mode voltages up to 65V - critical for high-side sensing accuracy. |
| VFB (Pin 1) | Feedback input | Compares output voltage (via external resistor divider) to 0.8V reference - sets regulated output with ±1% initial accuracy over temperature. |
| PGOOD (Pin 7) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from target - provides system-level fault signaling without external monitoring circuitry. |
| RUN (Pin 19) | Enable/shutdown control | Logic-level input: <1.12V disables switching; <0.7V enters ultra-low-IQ shutdown (10μA) - supports sequenced power-up/down. |
| DRVSET (Pin 9) | DRVCC regulation programming | Sets gate driver supply voltage (5V–10V) via resistor-to-GND - optimizes FET RDS(on) and switching loss trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide output capacitance (10µF–1000µF) and ESR ranges without manual compensation redesign. |
| No External Bootstrap Diode Required | Integrated switch in top gate driver eliminates discrete diode - reduces BOM count, layout area, and reliability risk in high-voltage designs. |
| Selectably Light-Load Operation | Configurable Burst Mode®, pulse-skipping, or forced continuous mode - balances efficiency vs. output ripple per application requirement. |
| Programmable Input OVLO | OVLO pin triggers soft-start reset at 1.2V threshold - protects downstream loads from overvoltage transients without external supervisor IC. |
| Multiple DRVCC Supply Options | Three independent LDO sources (VIN, EXTVCC, NDRV) with automatic switchover - ensures robust gate drive under varying input/bias conditions. |
Applications
| Automotive High-Voltage DC-DC Conversion | Industrial 48V–100V Power Distribution |
|---|---|
|
Use Scenario: Converting 60V battery stack output to 12V for infotainment and ADAS ECUs in 48V mild-hybrid vehicles. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-side/low-side N-MOSFETs with precise current sensing and thermal-safe shutdown. Use Value: 140V absolute max rating withstands load-dump transients; 150°C junction rating supports under-hood placement without derating. |
Use Scenario: Regulating 72V industrial bus to 5V/3.3V for PLC I/O modules and fieldbus gateways operating in factory environments. IC Role / Device Role / Timing Role: High-efficiency step-down controller with programmable frequency synchronization to avoid noise coupling into sensitive analog circuits. Use Value: 40μA quiescent current minimizes standby loss; OPTI-LOOP® ensures stability with large ceramic output capacitors used for EMI suppression. |
| Telecom Rectifier Module | High-Voltage Battery Backup System |
|
Use Scenario: Secondary-side regulation in -48V telecom rectifiers delivering 12V to fan controllers and management ASICs. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller with PGOOD signaling and phase-lock capability for multi-phase paralleling. Use Value: 75kHz–850kHz sync range aligns with industry-standard clock trees; 0.8V reference enables tight output tolerance (<±1%) across line/load/temp. |
Use Scenario: Charging and discharging control in 96V lithium-titanate battery backup for data center UPS systems. IC Role / Device Role / Timing Role: Bidirectional-capable controller (with external FET logic) regulating bidirectional energy flow between battery and 48V DC bus. Use Value: 100% duty cycle operation maintains regulation during battery voltage sag; programmable gate drive optimizes conduction loss in both directions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7803HUFD#PBF | Higher max switching frequency (1MHz), improved light-load efficiency via enhanced Burst Mode®, same 140V VIN and 0.8V reference. | Preferred for space-constrained designs requiring smaller inductors; less suitable where legacy 850kHz sync is mandated. | Select LTC7803HUFD#PBF when higher frequency enables smaller magnetics and tighter EMI control is needed. |
| MPQ4333HG-AEC1-P | Automotive AEC-Q100 Grade 1 (–40°C to +125°C), 100V max VIN, fixed 5V gate drive, no phase-lock capability. | Targeted at cost-sensitive automotive body electronics; lacks programmability and high-voltage margin of LTC7801HUFD#PBF. | Choose MPQ4333HG-AEC1-P only for AEC-Q100-compliant 100V systems where extended temperature and sync features are unnecessary. |
Compared with LTC7803HUFD#PBF and MPQ4333HG-AEC1-P, the LTC7801HUFD#PBF uniquely combines 140V operation, 150°C H-grade qualification, and full phase-lock support - making it the only option for high-reliability, high-temperature, synchronized high-voltage buck conversion.
Availability
LTC7801HUFD#PBF is available at Aetrix Electronics and suitable for automotive power conversion, industrial 48V–100V distribution, and telecom rectifier applications requiring stable component supply across extended temperature and high-voltage stress conditions.
Supply support for LTC7801HUFD#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 LTC7801HUFD#PBF belongs to Analog Devices' Power by Linear™ high-voltage controller family, engineered for robust, efficient DC/DC conversion in harsh environments where wide input range, thermal resilience, and precise regulation are critical.
FAQ
What is the maximum input voltage rating for the LTC7801HUFD#PBF?
The LTC7801HUFD#PBF has an absolute maximum input voltage rating of 150V, with guaranteed operation up to 140V across its full –40°C to +150°C junction temperature range. This makes it suitable for applications involving transient-prone high-voltage buses such as automotive 48V systems and telecom rectifiers.
Does the LTC7801HUFD#PBF require an external bootstrap diode?
No, the LTC7801HUFD#PBF integrates a switch in its top gate driver that eliminates the need for an external bootstrap diode. This simplifies layout, reduces component count, and improves reliability in high-voltage synchronous buck designs - a key differentiator versus legacy controllers.
How does the OPTI-LOOP® compensation work in the LTC7801HUFD#PBF?
The OPTI-LOOP® compensation in the LTC7801HUFD#PBF dynamically adjusts loop response based on output capacitor ESR and value, allowing stable operation across 10µF to 1000µF ceramic or polymer capacitors without manual compensation network changes - significantly accelerating design iteration.
Can the LTC7801HUFD#PBF operate with 100% duty cycle?
Yes, the LTC7801HUFD#PBF supports true 100% duty cycle operation when CPUMP_EN is tied to INTVCC, activating its internal charge pump to sustain gate drive during dropout conditions - essential for applications like battery-powered systems where input voltage may dip near output level.
What package type and thermal characteristics does the LTC7801HUFD#PBF use?
The LTC7801HUFD#PBF uses a 24-lead 4mm × 5mm plastic QFN package with exposed thermal pad (Pin 25 = GND). Its thermal resistance is θJA = 43°C/W when properly soldered to a 4-layer PCB with 1-in² copper pour - enabling reliable operation at 150°C junction temperature.
LTC7801HUFD#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x5)
LTC7801HUFD#PBF FAQ
1.How can I place an order for LTC7801HUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7801HUFD#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 LTC7801HUFD#PBF reliable?
The price and inventory of LTC7801HUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7801HUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC7801HUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7801HUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7801HUFD#PBF?
LTC7801HUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7801HUFD#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 LTC7801HUFD#PBF?
For technical support, including LTC7801HUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7801HUFD#PBF requirements.
6.How does Aetrix verify that LTC7801HUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7801HUFD#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 LTC7801HUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC7801HUFD#PBF?
All LTC7801HUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7801HUFD#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 LTC7801HUFD#PBF part is unused and in its original packaging.
Return procedure for LTC7801HUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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