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Analog Devices Inc. LTC7801EFE#PBF
- Part No.:
- LTC7801EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7801EFE#PBF.pdf
- Description:
- IC REG CTRLR SYNC BUCK 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:257
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Product details
Overview
LTC7801EFE#PBF from Analog Devices is a high-performance, 140V input synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It features 40μA no-load quiescent current, 0.8V precision reference, and 100% duty cycle capability via integrated charge pump - enabling ultra-low dropout operation in high-voltage battery systems such as industrial power supplies and telecom rectifiers.
For engineers reviewing the LTC7801EFE#PBF datasheet, LTC7801EFE#PBF pinout, LTC7801EFE#PBF application, or LTC7801EFE#PBF equivalent, key selection criteria include input voltage range (4V–140V), gate drive programmability (5V–10V), phase-lockable frequency (75kHz–850kHz), OPTI-LOOP® compensation, and dual-package availability (TSSOP-24 and QFN-24).
Technical Context
The LTC7801EFE#PBF implements a constant-frequency current-mode control architecture with internal error amplifier, slope compensation, and RS latch-based switching logic. Its differential current sense inputs (SENSE+, SENSE–) enable accurate peak-current limiting across wide common-mode voltage ranges (up to 65V), while the programmable ITH voltage directly sets the current trip threshold for each switching cycle.
Three independent LDO paths supply DRVCC: internal VIN-based, external NMOS NDRV-based, and EXTVCC-based with automatic switchover (4.7V/7.7V thresholds). The integrated charge pump (CPUMP_EN controllable) sustains BOOST voltage during 100% duty cycle, eliminating need for external bootstrap diode - critical for high-reliability industrial and automotive applications requiring extended dropout operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports direct connection to 48V/96V/120V industrial bus rails and high-voltage battery stacks without pre-regulation. |
| 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 system rails. |
| Quiescent Current | 40μA at no load - extends runtime in battery-powered equipment (e.g., remote sensors, portable test gear) and reduces standby losses. |
| Switching Frequency | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and compact magnetics design; fixed options at 350kHz/535kHz simplify layout. |
| Gate Drive Voltage | Programmable 5V–10V (OPTI-DRIVE™) - matches logic-level or standard-level MOSFETs to maximize efficiency and minimize conduction loss. |
| Duty Cycle Capability | 100% - enabled by internal charge pump; maintains regulation even when VIN ≈ VOUT, essential for high-voltage-to-low-voltage conversion in dropout conditions. |
| Reference Voltage Accuracy | ±1% over –40°C to 125°C - ensures stable output regulation across temperature extremes in industrial environments. |
Pinout & Package
Package: 24-Lead Plastic TSSOP (FE package), 4mm × 5mm footprint, exposed pad (Pin 25) soldered to PCB ground for thermal and electrical performance. θJA = 33°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 19) | Main input supply rail | Accepts 4V–140V; powers INTVCC LDO and internal logic; requires local ceramic bypass capacitor. |
| TG (Pin 13) | Top gate driver output | Floating high-side driver with DRVCC-referenced swing; drives gate of external high-side N-MOSFET. |
| SW (Pin 14) | Switch node | Connects to inductor and source of bottom FET; forms switching node for synchronous buck topology. |
| BG (Pin 16) | Bottom gate driver output | Ground-referenced driver for synchronous N-MOSFET; complements TG timing with dead-time control. |
| BOOST (Pin 15) | Bootstrap supply | Capacitor-connected to SW; provides floating supply for TG driver; enabled by internal charge pump. |
| VFB (Pin 1) | Feedback input | Monitors output via resistor divider; compares to 0.8V internal reference to regulate VOUT. |
| ITH (Pin 2) | Error amplifier output | Controls peak inductor current per cycle; higher voltage increases current limit and output power. |
| MODE (Pin 5) | Light-load operation mode select | Selects Burst Mode®, pulse-skipping, or forced continuous conduction - critical for efficiency optimization at light loads. |
| PGOOD (Pin 9) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from setpoint - enables system sequencing and fault monitoring. |
| RUN (Pin 21) | Enable/shutdown control | Logic-high (>1.12V) enables operation; <0.7V forces shutdown (10μA IQ); supports soft-start and sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide output capacitance (10µF–1000µF) and ESR ranges without external compensation redesign. |
| No External Bootstrap Diode Required | Integrated switch in top gate driver eliminates discrete diode - reduces BOM count, improves reliability, and simplifies layout. |
| Programmable DRVCC (5V–10V) | DRVSET pin configures gate drive voltage to match MOSFET VGS(th) and RDS(on), minimizing switching and conduction losses. |
| Triple DRVCC Supply Options | Supports VIN-based, EXTVCC-based, or external NMOS NDRV-based LDO - enables flexible power architecture and improved efficiency. |
| Selectably Adjustable UVLO/OVLO | DRVUV and OVLO pins allow precise input undervoltage lockout (4.0V–7.8V) and overvoltage protection (1.1V–1.3V) thresholds. |
| Low-Ripple Burst Mode® | Maintains tight output regulation (<1% ripple) during light-load operation - avoids audible noise and EMI issues in sensitive analog systems. |
Applications
| Industrial Power Supply | Telecom Rectifier Module |
|---|---|
Use Scenario: 48V/96V DC distribution bus powering PLC I/O modules, motor drives, and field transmitters. IC Role / Device Role / Timing Role: Primary step-down controller regulating 12V/5V auxiliary rails from high-voltage bus with 100% duty cycle support during brownout. Use Value: 40μA quiescent current minimizes standby loss; 140V abs max rating ensures robustness against line transients and surges. |
Use Scenario: AC/DC front-end rectifier output (54V nominal) feeding intermediate bus for base station RF amplifiers and digital signal processors. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller delivering 3.3V/1.2V rails with phase-lockable frequency to reduce conducted EMI in dense RF environments. Use Value: 850kHz max switching frequency enables small magnetics; OPTI-LOOP® ensures stability with polymer capacitors used for low-profile board space. |
| High-Voltage Battery System | Automotive Test Equipment |
Use Scenario: 72V lithium-ion battery pack powering onboard chargers, DC-DC converters, and telemetry units in EV charging infrastructure. IC Role / Device Role / Timing Role: Input-stage controller stepping down battery voltage to 12V/24V system rails with programmable gate drive for optimal MOSFET selection. Use Value: Adjustable DRVCC (5V–10V) accommodates both logic-level and standard MOSFETs; 125°C operating range suits under-hood thermal environments. |
Use Scenario: Portable battery-operated diagnostic tool requiring long runtime and clean 5V/3.3V supplies for microcontroller and ADC subsystems. IC Role / Device Role / Timing Role: Low-IQ step-down controller enabling multi-day operation on single LiPo cell; Burst Mode® suppresses light-load ripple. Use Value: 40μA no-load IQ extends battery life; PGOOD output enables safe power sequencing and fault reporting to host MCU. |
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 |
|---|---|---|---|
| LTC7803EFE#PBF | Higher max input voltage (400V), lower IQ (35μA), added current monitor output (IMON), but no CPUMP_EN pin - no 100% duty cycle support. | Suitable for ultra-high-voltage PV string inverters or arc-fault detection systems where 100% duty cycle is not required. | Choose LTC7803EFE#PBF only if input exceeds 140V; otherwise LTC7801EFE#PBF offers superior dropout capability and simpler gate drive configuration. |
| LM5116MH/NOPB | Max input 100V, fixed 7.5V gate drive, no programmable DRVCC or OPTI-LOOP®, higher IQ (100μA), no phase-lockable frequency. | Targeted at cost-sensitive industrial SMPS where 140V rating and advanced light-load modes are unnecessary. | Choose LM5116MH/NOPB for legacy designs or budget-constrained projects; LTC7801EFE#PBF delivers measurable efficiency gains above 72V input and in battery-critical applications. |
Compared with LTC7803EFE#PBF and LM5116MH/NOPB, the LTC7801EFE#PBF uniquely combines 140V input tolerance, 100% duty cycle, 40μA IQ, and programmable gate drive - making it the optimal choice for high-reliability, high-efficiency industrial and telecom power conversion where dropout margin and light-load performance are critical.
Availability
LTC7801EFE#PBF is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifiers, and high-voltage battery systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC7801EFE#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and healthcare markets.
The LTC7801EFE#PBF belongs to Linear's high-voltage monolithic controller family, designed specifically for rugged, efficient DC/DC conversion in harsh environments - emphasizing wide VIN range, low IQ, and flexible gate drive for N-MOSFET topologies.
FAQ
What is the absolute maximum input voltage rating for the LTC7801EFE#PBF?
The LTC7801EFE#PBF has an absolute maximum input supply voltage (VIN) rating of 150V. Operation up to 140V is specified in the recommended operating conditions. Exceeding 150V may cause permanent damage. This rating applies to both the VIN pin and the BOOST pin, which swings to VIN + DRVCC during operation.
Does the LTC7801EFE#PBF support 100% duty cycle operation, and how is it enabled?
Yes, the LTC7801EFE#PBF supports true 100% duty cycle operation via its integrated charge pump. To enable it, tie the CPUMP_EN pin (Pin 7) to INTVCC. When active, the charge pump sustains BOOST voltage during extended on-times, allowing regulation even when VIN approaches VOUT - a critical feature for high-voltage-to-low-voltage conversion in dropout scenarios.
How does the MODE pin configure light-load behavior on the LTC7801EFE#PBF?
The MODE pin (Pin 5) selects among three light-load operating modes: grounding enables Burst Mode® (default burst clamp at 25% of VSENSE(MAX)); applying 0.5V–1.0V adjusts burst clamp level (10%–60%); tying to INTVCC forces continuous conduction; and applying >1.4V enables pulse-skipping. This flexibility optimizes efficiency and output ripple across varying load profiles.
Can the LTC7801EFE#PBF drive both logic-level and standard MOSFETs, and how is gate drive voltage set?
Yes, the LTC7801EFE#PBF supports both logic-level and standard MOSFETs via OPTI-DRIVE™. Gate drive voltage (DRVCC) is programmed using the DRVSET pin (Pin 11): tie to GND for 6.0V, to INTVCC for 10V, or use a resistor (50k–100kΩ) to GND for intermediate values (e.g., 5.0V at 50kΩ, 7.0V at 70kΩ, 9.0V at 90kΩ), matching VGS requirements precisely.
What is the purpose of the EXTVCC pin on the LTC7801EFE#PBF, and what voltage range is acceptable?
The EXTVCC pin (Pin 20) provides an alternative input to the internal DRVCC LDO, enabling higher efficiency by bypassing the VIN-based regulator when an external 5V–13V supply is available. Its switchover threshold is 4.7V (low) or 7.7V (high), selected by DRVUV. EXTVCC must not exceed 14V and must never be higher than VIN to prevent backfeed or damage.
LTC7801EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) 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-TSSOP
LTC7801EFE#PBF FAQ
1.How can I place an order for LTC7801EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7801EFE#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 LTC7801EFE#PBF reliable?
The price and inventory of LTC7801EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7801EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7801EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7801EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7801EFE#PBF?
LTC7801EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7801EFE#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 LTC7801EFE#PBF?
For technical support, including LTC7801EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7801EFE#PBF requirements.
6.How does Aetrix verify that LTC7801EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7801EFE#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 LTC7801EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7801EFE#PBF?
All LTC7801EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7801EFE#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 LTC7801EFE#PBF part is unused and in its original packaging.
Return procedure for LTC7801EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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