My Inquiry
My Account
Analog Devices Inc. LTC7801EUFD#PBF
- Part No.:
- LTC7801EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC7801EUFD#PBF.pdf
- Description:
- IC REG CTRLR SYNC BUCK 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:10,050
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC7801EUFD#PBF from Analog Devices is a high-voltage, low-quiescent-current synchronous step-down DC/DC controller driving all-N-channel MOSFETs, supporting input voltages up to 140V and output voltages from 0.8V to 60V, with 40μA no-load IQ, 100% duty cycle capability, and phase-lockable switching frequency up to 850kHz - deployed in telecom power supplies, industrial battery systems, and automotive high-vin converters.
For engineers reviewing the LTC7801EUFD#PBF datasheet, LTC7801EUFD#PBF pinout, LTC7801EUFD#PBF application, or LTC7801EUFD#PBF equivalent, key selection considerations include gate drive voltage programmability (5V–10V), OPTI-LOOP® compensation for wide output capacitor/ESR tolerance, precision 0.8V reference, PGOOD monitoring, and dual LDO options (VIN/NDRV/EXTVCC) for flexible DRVCC sourcing.
Technical Context
The LTC7801EUFD#PBF implements a constant-frequency current-mode control architecture with integrated top/bottom N-channel gate drivers, programmable UVLO thresholds via DRVUV, and selectable light-load operation modes (Burst Mode®, pulse-skipping, or forced continuous). Its error amplifier features OPTI-LOOP® compensation, enabling stable loop response across diverse output capacitance and ESR values without external compensation redesign.
It integrates multiple independent LDO paths for DRVCC: internal VIN-based, external NMOS-driven NDRV LDO, and EXTVCC-sourced LDO with switchover thresholds (4.7V or 7.7V) set by DRVUV. The charge pump enables 100% duty cycle operation when CPUMP_EN is high, while the integrated BOOST-to-DRVCC switch eliminates need for an external bootstrap diode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports wide-input industrial and telecom power rails; absolute max rating 150V. |
| Output Voltage Range | 0.8V to 60V - set via external resistor divider on VFB; precision 0.8V reference ±1% over temperature. |
| No-Load Quiescent Current | 40μA - extends runtime in battery-powered systems; drops to 10μA in shutdown. |
| Switching Frequency Range | 75kHz to 850kHz - phase-lockable via PLLIN; fixed frequencies selectable via FREQ pin (50–900kHz). |
| Gate Drive Voltage | Programmable 5V–10V via DRVSET - optimizes efficiency for logic-level or standard-level MOSFETs. |
| Duty Cycle Capability | 100% - enabled by internal charge pump when CPUMP_EN = INTVCC; supports dropout operation. |
| Current Sense Threshold | 66–84mV - differential SENSE+/SENSE− inputs with adjustable trip point via ITH voltage. |
Pinout & Package
Package: 24-lead (4mm × 5mm) plastic QFN with exposed thermal pad (Pin 25 = GND); rated θJA = 43°C/W; operating junction temperature range –40°C to +125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 17) | Main input supply connection | Accepts 4V–140V input; powers INTVCC LDO and internal logic; requires local ceramic bypass. |
| TG (Pin 11) | Top gate driver output | Floating high-side driver output referenced to SW node; swing = DRVCC superimposed on SW voltage. |
| SW (Pin 12) | Switch node | Connection point between external inductor and both MOSFETs; critical for layout and noise control. |
| BG (Pin 14) | Bottom gate driver output | Low-side driver output referenced to GND; swing = 0V to DRVCC; drives synchronous rectifier. |
| BOOST (Pin 13) | Bootstrap supply node | Connected to SW via capacitor; supplies floating gate drive for TG; voltage = SW + DRVCC. |
| DRVCC (Pin 15) | Gate driver supply rail | Output of internal/external LDOs; powers TG/BG drivers; must be decoupled with ≥4.7µF low-ESR ceramic. |
| VFB (Pin 1) | Feedback input | Monitors regulated output via external resistor divider; compares to 0.8V reference for regulation. |
| ITH (Pin 2) | Error amplifier output | Controls peak inductor current; sets current comparator threshold; used for loop compensation. |
| MODE (Pin 3) | Light-load operation mode select | Selects Burst Mode®, pulse-skipping, or forced continuous; also adjusts burst clamp level (10–60%). |
| GND (Pins 4, 25) | Ground reference | All ground pins must be tied together; exposed pad (Pin 25) must be soldered to PCB ground for thermal/electrical performance. |
| CPUMP_EN (Pin 5) | Charge pump enable | High = enables charge pump for 100% duty cycle; low = enables boost refresh for 99% duty cycle. |
| PLLIN (Pin 6) | External sync input | Accepts 75–850kHz clock; synchronizes rising edge of TG to external clock's rising edge. |
| PGOOD (Pin 7) | Power good indicator | Open-drain output pulled low when VFB deviates >±10% from setpoint; requires external pull-up. |
| FREQ (Pin 8) | Frequency programming | Resistor-to-GND sets frequency (50–900kHz); tied to GND/INTVCC for fixed 350/535kHz operation. |
| DRVSET (Pin 9) | DRVCC regulation program | Sets DRVCC voltage (5–10V) via resistor divider; internal 20µA pull-up defines reference. |
| DRVUV (Pin 10) | DRVCC UVLO threshold select | Chooses lower (4.0–4.2V) or higher (7.5–7.8V) UVLO thresholds and EXTVCC switchover points. |
| NDRV (Pin 16) | External NMOS pass device driver | Drives gate of external NFET for NDRV LDO; enables low-dropout DRVCC regulation above VIN. |
| EXTVCC (Pin 18) | External DRVCC supply input | Input to internal LDO; supplies DRVCC when >4.7V/7.7V (per DRVUV); max 14V; tie to GND if unused. |
| RUN (Pin 19) | Enable/shutdown control | ≥1.2V = ON; ≤1.1V = shutdown; ≤0.7V = ultra-low-IQ shutdown (10μA); not floatable. |
| INTVCC (Pin 20) | Internal 5V LDO output | Powers analog/digital circuitry; requires 0.1µF ceramic bypass close to IC; max load 2mA. |
| OVLO (Pin 21) | Input overvoltage lockout | Disables switching when >1.2V; maintains INTVCC/DRVCC regulation; soft-start resets on fault clearance. |
| SENSE+ (Pin 22) | Current sense positive input | + input of differential current comparator; used with SENSE− and RSENSE to set current limit. |
| SENSE− (Pin 23) | Current sense negative input | − input of differential current comparator; supplies comparator bias when > INTVCC − 0.5V. |
| SS (Pin 24) | Soft-start and shutdown control | Regulates VFB to min(0.8V, VSS); internal 10µA pull-up; capacitor sets ramp time; supports REGSD. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable transient response across wide ranges of output capacitance (e.g., 10µF–1000µF) and ESR (1mΩ–100mΩ) without compensation redesign. |
| Programmable Gate Drive (OPTI-DRIVE) | DRVSET pin allows precise 5V–10V DRVCC setting to match MOSFET VGS(th) and RDS(on), maximizing efficiency at light and full load. |
| Multi-Source DRVCC LDO Architecture | Three independent LDO paths (VIN, NDRV, EXTVCC) with automatic switchover provide robust gate drive under varying input/thermal conditions. |
| Integrated Charge Pump & Bootstrap Switch | Eliminates external bootstrap diode; enables 100% duty cycle operation and simplifies layout while reducing BOM count. |
| Configurable Light-Load Operation | MODE pin selects Burst Mode® (highest light-load efficiency), pulse-skipping (low ripple), or forced continuous (lowest noise) - no external components needed. |
| Robust Protection Suite | Includes input OVLO, RUN-controlled shutdown, PGOOD monitoring, thermal shutdown, and current-limit foldback - all implemented in hardware. |
Applications
| Telecom Power Supply | Industrial Battery System |
|---|---|
|
Use Scenario: 48V or 72V battery-backed DC distribution in base station power shelves requiring regulated 12V/5V rails. IC Role / Device Role / Timing Role: Primary high-vin step-down controller managing power conversion from battery or rectified AC input. Use Value: 140V max input withstands battery stack transients; 40μA IQ extends backup runtime; PGOOD enables system-level fault reporting. |
Use Scenario: Power management in mobile industrial equipment (e.g., robotic AGVs) using 24V–60V Li-ion or lead-acid battery packs. IC Role / Device Role / Timing Role: High-efficiency buck controller delivering stable 3.3V/5V/12V to MCU, sensors, and actuators. Use Value: Wide 0.8V–60V output adjustability supports multiple rail requirements; 100% duty cycle sustains output during deep battery discharge. |
| Automotive High-Vin Converter | High-Voltage Industrial PSU |
|
Use Scenario: 24V/48V commercial vehicle subsystems (e.g., ADAS cameras, infotainment) needing isolated or non-isolated 5V/3.3V supplies. IC Role / Device Role / Timing Role: Primary DC/DC controller in front-end power stage handling load dump (up to 140V) and cold-crank conditions. Use Value: 150V abs max rating survives ISO 7637-2 load dump pulses; programmable UVLO prevents false shutdown during cranking. |
Use Scenario: Programmable lab power supplies or industrial motor drives requiring tightly regulated auxiliary rails from 100V+ bus voltages. IC Role / Device Role / Timing Role: Precision-controlled buck stage generating low-noise, low-ripple bias rails for gate drivers and analog circuitry. Use Value: OPTI-LOOP® ensures stability with large electrolytic output caps; phase-lockable frequency avoids EMI band interference. |
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 |
|---|---|---|---|
| LTC7804IUFD#PBF | Higher max input (40V → 150V), same 24-pin QFN, adds spread-spectrum modulation and improved current sensing accuracy (±0.5% vs ±1.2%). | Preferred where EMI compliance is critical (e.g., medical, aerospace); supports tighter current limit tolerance in precision motor control. | Choose LTC7804 for new designs requiring lower EMI or enhanced current measurement fidelity; pin-compatible but requires updated layout for SS/ITH compensation. |
| MP24894GQ-U | Lower max input (60V), fixed 5V DRVCC, no PLLIN or EXTVCC support, smaller 16-pin QFN, 60μA IQ (vs 40μA), no OPTI-LOOP®. | Suitable for cost-sensitive, lower-vin industrial applications where 100% duty cycle and multi-LDO flexibility are unnecessary. | Consider MP24894GQ-U only for <60V systems with simpler power tree; not drop-in due to pin count, feature set, and package mismatch. |
Compared with LTC7804IUFD#PBF, the LTC7801EUFD#PBF offers superior light-load efficiency and broader DRVCC programmability but lacks spread-spectrum and tighter current sense accuracy; versus MP24894GQ-U, it delivers higher voltage resilience, lower IQ, and advanced control features at higher BOM cost and design complexity.
Availability
LTC7801EUFD#PBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial battery systems, and automotive high-vin converters requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC7801EUFD#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 LTC7801EUFD#PBF belongs to Analog Devices' Power by Linear™ high-voltage controller product line, designed specifically for robust, efficient DC/DC conversion in harsh environments with wide input ranges and stringent reliability requirements.
FAQ
What is the maximum input voltage rating for the LTC7801EUFD#PBF?
The LTC7801EUFD#PBF has an absolute maximum input voltage rating of 150V on the VIN pin, with a recommended operating range of 4V to 140V. This high-voltage tolerance makes it suitable for telecom, industrial, and automotive applications where input transients or battery stack voltages exceed standard 60V controllers. Exceeding 150V may cause permanent damage.
How does the OPTI-LOOP® compensation work in the LTC7801EUFD#PBF?
OPTI-LOOP® compensation in the LTC7801EUFD#PBF dynamically adapts the error amplifier's transconductance and pole/zero placement based on output capacitor ESR and capacitance, enabling stable loop response across wide variations - e.g., from 10µF ceramic to 1000µF electrolytic outputs - without manual compensation redesign. It operates through the ITH pin and internal gm amplifier.
Can the LTC7801EUFD#PBF operate with 100% duty cycle, and how is it enabled?
Yes, the LTC7801EUFD#PBF supports true 100% duty cycle operation when CPUMP_EN is driven high (to INTVCC), activating the internal charge pump to sustain BOOST voltage during dropout. When CPUMP_EN is low, it defaults to ~99% duty cycle using boot-refresh. This capability is essential for maintaining regulation during deep input voltage sags.
What are the supported light-load operation modes for the LTC7801EUFD#PBF?
The LTC7801EUFD#PBF supports three configurable light-load modes via the MODE pin: Burst Mode® (highest efficiency, lowest IQ), pulse-skipping (reduced ripple vs Burst), and forced continuous conduction (lowest noise, best EMI profile). Each mode is selected by applying specific voltages (GND, 0.5–1.0V, INTVCC, or >1.4V) to MODE - no external components required.
Does the LTC7801EUFD#PBF require an external bootstrap diode?
No, the LTC7801EUFD#PBF integrates a BOOST-to-DRVCC switch that replaces the traditional external bootstrap diode. This reduces component count, improves reliability, and simplifies PCB layout. The internal switch works in conjunction with the external BOOST capacitor and charge pump (when enabled) to maintain gate drive during high-duty-cycle operation.
LTC7801EUFD#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)
LTC7801EUFD#PBF FAQ
1.How can I place an order for LTC7801EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7801EUFD#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 LTC7801EUFD#PBF reliable?
The price and inventory of LTC7801EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7801EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC7801EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7801EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7801EUFD#PBF?
LTC7801EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7801EUFD#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 LTC7801EUFD#PBF?
For technical support, including LTC7801EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7801EUFD#PBF requirements.
6.How does Aetrix verify that LTC7801EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7801EUFD#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 LTC7801EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC7801EUFD#PBF?
All LTC7801EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7801EUFD#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 LTC7801EUFD#PBF part is unused and in its original packaging.
Return procedure for LTC7801EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC7801EUFD#PBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
