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Analog Devices Inc. LTC7801IFE#TRPBF
- Part No.:
- LTC7801IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7801IFE#TRPBF.pdf
- Description:
- IC REG CTRLR SYNC BUCK 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,778
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Product details
Overview
LTC7801IFE#TRPBF from Analog Devices is a high-performance, 150V-input synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It operates from 4V to 140V input, delivers 0.8V–60V programmable output, features 40μA no-load quiescent current, and supports phase-lockable switching up to 850kHz - ideal for high-voltage battery systems and telecom power supplies.
For engineers reviewing the LTC7801IFE#TRPBF datasheet, LTC7801IFE#TRPBF pinout, LTC7801IFE#TRPBF application, or LTC7801IFE#TRPBF equivalent, key selection criteria include its 100% duty cycle capability, OPTI-LOOP® compensation for wide ESR/output capacitance tolerance, selectable light-load modes (Burst Mode®, pulse-skipping, forced continuous), and dual LDO options (VIN-, EXTVCC-, or NDRV-based DRVCC regulation).
Technical Context
The LTC7801IFE#TRPBF implements a constant-frequency current-mode control architecture with integrated top- and bottom-gate drivers, eliminating external bootstrap diodes via an internal switch in the TG driver and enabling 100% duty cycle operation through an integrated charge pump. Its error amplifier features OPTI-LOOP® compensation, allowing stable loop response across diverse output capacitor types and ESR values without manual compensation redesign.
It supports three independent DRVCC supply paths - internal VIN LDO, external NMOS-based NDRV LDO, or EXTVCC LDO - with switchover thresholds programmable via DRVUV pin. Gate drive voltage is adjustable from 5V to 10V (via DRVSET), and UVLO thresholds, OVLO protection, and soft-start timing are fully configurable using external resistors and capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports wide industrial, automotive, and telecom input rails including 48V, 96V, and 110V nominal 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 system rails. |
| No-Load Quiescent Current | 40μA - extends runtime in battery-backed or energy-sensitive applications such as remote sensors and backup power modules. |
| Switching Frequency Range | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and inductor size reduction while maintaining compatibility with external clock sources. |
| Gate Drive Voltage | Programmable 5V–10V (OPTI-DRIVE™) - matches logic-level or standard-threshold MOSFETs to maximize efficiency and minimize conduction losses. |
| Duty Cycle Capability | 100% - enables dropout operation down to VOUT ≈ VIN, critical for high-step-down ratios and low-input emergency operation. |
| Reference Voltage Accuracy | ±1% over –40°C to 125°C - ensures precise output regulation across temperature without calibration. |
Pinout & Package
Package: 24-lead plastic TSSOP (FE package), 4mm × 5mm footprint, exposed thermal pad (Pin 25 = GND). Requires soldering of exposed pad to PCB ground plane for rated electrical performance and thermal dissipation (θJA = 33°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE– / SENSE+ | Differential current sense inputs | Enable accurate peak-current-mode control; tolerate common-mode voltages up to 65V and support high-side sensing with external shunt. |
| TG / BG / SW / BOOST | High-side gate driver, low-side gate driver, switch node, boot supply | Drive external N-MOSFETs; BOOST–SW capacitor sustains high-side gate drive during 100% duty cycle; integrated bootstrap switch removes external diode. |
| VIN / INTVCC / DRVCC / EXTVCC | Main input, internal 5V LDO, gate driver supply, external gate driver LDO input | Three independent DRVCC sourcing options (VIN-, NDRV-, or EXTVCC-based) with switchover thresholds set by DRVUV pin. |
| FREQ / PLLIN / MODE / RUN / OVLO | Frequency programming, sync input, light-load mode select, enable, overvoltage lockout | Full configurability: fixed or resistor-programmed frequency; external clock sync; Burst Mode® clamp adjustment; shutdown and fault protection with hysteresis. |
| VFB / ITH / SS / PGOOD | Feedback input, error amp output, soft-start, power-good indicator | VFB references 0.8V internal bandgap; ITH sets current limit threshold; SS controls startup ramp and enables REGSD shutdown; PGOOD asserts open-drain when VFB is within ±10%. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across 10× variation in output capacitor ESR and 100× variation in capacitance - eliminates re-tuning for different ceramic/polymer/tantalum combinations. |
| 100% Duty Cycle Operation | Supported via CPUMP_EN-controlled charge pump - maintains regulation even when VIN drops near VOUT, essential for hold-up and brownout resilience. |
| Triple DRVCC Supply Architecture | Allows optimal gate drive voltage selection: VIN-based (7–10V), EXTVCC-based (5–10V), or NDRV-based (5–10V with >VIN capability) - improves efficiency and thermal margin under varying input conditions. |
| Selectably Programmable Light-Load Modes | Burst Mode® (with adjustable clamp), pulse-skipping, or forced continuous - balances efficiency vs. output ripple/noise per application requirement without hardware change. |
| Integrated Power-Good Monitoring | PGOOD open-drain output asserts low when VFB deviates >±10% from 0.8V reference - provides reliable system sequencing and fault signaling without external comparators. |
Applications
| Telecom Power Supply | Industrial HV Battery System |
|---|---|
Use Scenario: 48V or 72V telecom rectifier output stepped down to 12V/5V for base station radios and backhaul equipment. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency conversion with tight regulation under dynamic load transients. Use Value: 40μA IQ extends standby time during grid outage; 140V max input withstands surge events per GR-1089; PGOOD enables safe hot-swap sequencing. | Use Scenario: 96V lithium-ion battery pack powering motor drives or PLC I/O modules in factory automation. IC Role / Device Role / Timing Role: High-voltage step-down controller delivering isolated auxiliary rails (e.g., 5V, 3.3V) for microcontrollers and sensors. Use Value: 100% duty cycle maintains output during deep discharge; OPTI-LOOP® tolerates aging electrolytic bulk caps; EXTVCC option enables local 12V rail powering DRVCC for improved noise immunity. |
| Automotive 48V Mild Hybrid | Test & Measurement Equipment |
Use Scenario: 48V main bus converted to 12V for legacy ECUs and infotainment subsystems in 48V mild hybrid vehicles. IC Role / Device Role / Timing Role: Robust buck controller operating across –40°C to 125°C junction range with AEC-Q200-compatible packaging (LTC7801IFE grade). Use Value: Adjustable UVLO/OVLO protects against battery transients; 850kHz sync capability reduces conducted EMI in crowded vehicle harnesses; low IQ minimizes parasitic drain. | Use Scenario: Precision lab power supply generating stable 24V/5A outputs with minimal ripple for DUT biasing. IC Role / Device Role / Timing Role: High-accuracy, low-noise controller supporting low-ripple forced continuous mode and precision 0.8V reference (±1%). Use Value: OPTI-DRIVE™ selects 10V gate drive for lowest RDS(on) MOSFETs; soft-start (SS pin) prevents inrush; PGOOD confirms regulation before enabling downstream loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7803IFE#TRPBF | Higher 200V input rating; includes integrated MOSFET drivers with enhanced shoot-through protection; same pinout and feature set. | Supports wider input range (up to 200V); better suited for 110VAC rectified or railway applications where transient margins exceed 150V. | Select LTC7803IFE#TRPBF when input surges exceed 140V or when tighter gate timing control is required for ultra-low RDS(on) FETs. |
| LM5113MMX/NOPB | Standalone dual gate driver (no controller); requires external PWM source; supports up to 100V bootstrap operation but no 100% duty cycle or charge pump. | Used with external controllers (e.g., UC384x, TPS40200); lacks integrated error amp, reference, or protection features - needs full external control loop design. | Choose LM5113MMX/NOPB only when existing controller architecture mandates discrete driver separation or when cost-sensitive designs avoid integrated controllers. |
Compared with LTC7803IFE#TRPBF, the LTC7801IFE#TRPBF offers lower cost and sufficient 140V rating for most industrial/telecom use cases, while LM5113MMX/NOPB shifts complexity to external control but enables higher-frequency (>1MHz) operation with custom timing.
Availability
LTC7801IFE#TRPBF is available at Aetrix Electronics and suitable for telecom power systems, industrial HV battery management, and automotive 48V auxiliary power supplies requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term lifecycle support.
Supply support for LTC7801IFE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7801IFE#TRPBF belongs to Analog Devices' Power by Linear™ high-voltage controller family, designed specifically for robust, efficient DC/DC conversion in harsh environments where wide input range, low quiescent current, and flexible gate drive are critical.
FAQ
What is the maximum input voltage rating for the LTC7801IFE#TRPBF?
The LTC7801IFE#TRPBF has an absolute maximum input voltage rating of 150V on the VIN pin, with guaranteed operation up to 140V across its full –40°C to 125°C junction temperature range. This makes it suitable for 48V, 72V, and 96V battery systems as well as telecom rectified inputs.
Does the LTC7801IFE#TRPBF support 100% duty cycle operation, and how is it enabled?
Yes, the LTC7801IFE#TRPBF supports true 100% duty cycle operation via its integrated charge pump. To enable it, tie the CPUMP_EN pin to INTVCC. When disabled (CPUMP_EN = GND), the device supports up to 99% duty cycle using boost refresh. This capability ensures regulation during deep input voltage droop.
How does the OPTI-LOOP® compensation in the LTC7801IFE#TRPBF simplify design?
OPTI-LOOP® compensation in the LTC7801IFE#TRPBF dynamically adapts loop stability to variations in output capacitor ESR and capacitance value. It eliminates the need to recalculate compensation components when changing from ceramic to polymer or electrolytic capacitors - reducing design iterations and validation time for multi-rail power systems.
Can the LTC7801IFE#TRPBF drive both logic-level and standard-threshold MOSFETs?
Yes, the LTC7801IFE#TRPBF supports adjustable gate drive voltage from 5V to 10V via the DRVSET pin. Tying DRVSET to GND yields ~6V drive; connecting to INTVCC yields ~10V; intermediate voltages (e.g., 5V, 7V, 9V) are set with external resistors - enabling optimal RDS(on) utilization for both logic- and standard-level N-channel MOSFETs.
What protection features are integrated into the LTC7801IFE#TRPBF?
The LTC7801IFE#TRPBF integrates input overvoltage lockout (OVLO), programmable undervoltage lockout (UVLO), power-good monitoring (PGOOD), thermal shutdown, and current-limit protection via SENSE+/- differential inputs. All protections include hysteresis and operate independently of the control loop to ensure fail-safe behavior under fault conditions.
LTC7801IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) 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 ~ 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
LTC7801IFE#TRPBF FAQ
1.How can I place an order for LTC7801IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7801IFE#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 LTC7801IFE#TRPBF reliable?
The price and inventory of LTC7801IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7801IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7801IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7801IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7801IFE#TRPBF?
LTC7801IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7801IFE#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 LTC7801IFE#TRPBF?
For technical support, including LTC7801IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7801IFE#TRPBF requirements.
6.How does Aetrix verify that LTC7801IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7801IFE#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 LTC7801IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7801IFE#TRPBF?
All LTC7801IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7801IFE#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 LTC7801IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7801IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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