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Analog Devices Inc. LTC7801EFE#TRPBF
- Part No.:
- LTC7801EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7801EFE#TRPBF.pdf
- Description:
- IC REG CTRLR SYNC BUCK 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,715
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Product details
Overview
LTC7801EFE#TRPBF from Analog Devices is a high-voltage 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. It features 40μA no-load quiescent current, phase-lockable switching frequency up to 850kHz, and integrated charge pump enabling 100% duty cycle operation - ideal for high-voltage battery-powered telecom and industrial power systems.
For engineers reviewing the LTC7801EFE#TRPBF datasheet, LTC7801EFE#TRPBF pinout, LTC7801EFE#TRPBF application, or LTC7801EFE#TRPBF equivalent, key selection criteria include its wide 4V–140V input range, programmable gate drive (5V–10V), OPTI-LOOP® compensation, precision 0.8V reference, and dual-package availability in 24-lead TSSOP and QFN.
Technical Context
The LTC7801EFE#TRPBF implements a constant-frequency current-mode control architecture with an internal transconductance error amplifier (gm = 2 mmho) and slope-compensated PWM. Its dual-loop sensing uses differential SENSE+/SENSE– inputs for accurate current limiting and supports three light-load operating modes: forced continuous, pulse-skipping, and Burst Mode® with adjustable clamp.
It integrates multiple power rails: a 5V INTVCC LDO, a programmable DRVCC LDO (5V–10V via DRVSET), and switchover-capable EXTVCC LDO. Gate drivers feature matched rise/fall times (25ns/15ns), <100ns dead-time control, and bootstrap-free top-side drive via integrated charge pump and BOOST-SW switch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - enables direct regulation from 48V/96V/110V industrial or telecom supplies without pre-regulation. |
| Output Voltage Range | 0.8V to 60V - set via external resistor divider on VFB; supports 12V system rails and low-voltage ASIC/FPGA cores. |
| No-Load Quiescent Current | 40μA - extends runtime in always-on battery-backed systems such as remote sensors or backup power modules. |
| Switching Frequency Range | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and compact magnetics design across diverse load conditions. |
| Gate Drive Voltage | Programmable 5V–10V (OPTI-DRIVE™) - matches logic-level or standard-threshold MOSFETs to minimize conduction loss and gate charge. |
| Duty Cycle Capability | 100% - supports dropout operation (VIN ≈ VOUT), critical for high-efficiency 12V-out converters fed from 12V–15V batteries. |
| Reference Voltage Accuracy | ±1% over –40°C to 125°C - ensures stable output regulation across automotive and industrial temperature ranges. |
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 |
|---|---|---|
| SENSE– (Pin 1) | Differential current sense negative input | References current-sense amplifier; supplies comparator bias when > INTVCC − 0.5V; must avoid voltage sources. |
| SS (Pin 2) | Soft-start and regulator shutdown control | Internal 10μA pull-up sets ramp time; 5μA/1μA pull-down enables REGSD shutdown; capacitor-to-ground defines startup profile. |
| VFB (Pin 3) | Feedback input | Compares output voltage (via external divider) to 0.8V reference; ±10% PGOOD trip threshold referenced here. |
| ITH (Pin 4) | Error amplifier output / compensation node | Controls peak inductor current; voltage directly sets current comparator threshold; used for OPTI-LOOP® loop compensation. |
| MODE (Pin 5) | Light-load operation mode select | Selects Burst Mode® (ground), pulse-skipping (>1.4V), or forced continuous (INTVCC); adjusts burst clamp level 10%–60% of VSENSE(MAX). |
| GND (Pin 6, Exposed Pad 25) | Power and signal ground reference | All GND pins and exposed pad must be connected to low-impedance PCB ground plane for rated thermal performance and noise immunity. |
| CPUMP_EN (Pin 7) | Charge pump enable for high-side driver | INTVCC enables full 100% duty cycle; GND limits to 99%; floating state is prohibited. |
| PLLIN (Pin 8) | External synchronization input | Accepts 75kHz–850kHz clock; forces TG rising edge alignment; preserves MODE-selected light-load behavior during sync. |
| PGOOD (Pin 9) | Open-drain power-good indicator | Pulled low when VFB deviates >±10% from setpoint; requires external pull-up; 40μs fault reporting delay. |
| FREQ (Pin 10) | Frequency programming input | Resistor-to-GND sets 50kHz–900kHz; INTVCC = 535kHz fixed; GND = 350kHz fixed; internal 20μA current source. |
| DRVSET (Pin 11) | DRVCC regulation program pin | Resistor-to-GND (50k–100k) programs DRVCC from 5V–10V; GND = 6.0V, INTVCC = 10.0V; enables optimal FET gate drive. |
| DRVUV (Pin 12) | DRVCC UVLO threshold select | GND selects lower UVLO (4.0V/3.6V), INTVCC selects higher (7.5V/6.4V); also controls EXTVCC switchover thresholds. |
| SENSE+ (Pin 22) | Differential current sense positive input | Paired with SENSE–; offset + ITH voltage determines current limit threshold; RSENSE sets trip point (66–84mV typical). |
| OVLO (Pin 21) | Input overvoltage lockout | Trips at 1.2V rising threshold; triggers soft-start reset; maintains DRVCC/INTVCC regulation during fault; tie to GND if unused. |
| RUN (Pin 19) | Enable/disable control | 1.12V ON threshold, 0.7V deep shutdown (10μA IQ); hysteresis = 80mV; tie to VIN for always-on operation. |
| TG (Pin 11) | Top-gate driver output | Floating high-side driver; swing = DRVCC superimposed on SW node; matched 2.2Ω pull-up / 1.0Ω pull-down resistance. |
| BG (Pin 14) | Bottom-gate driver output | Synchronous N-MOSFET driver; swing = 0V to DRVCC; matched 2.0Ω pull-up / 1.0Ω pull-down resistance. |
| SW (Pin 12) | Switch node connection | Connects to inductor and BOOST capacitor; handles high dV/dt; absolute max = –5V to 150V. |
| BOOST (Pin 13) | Bootstrap supply for top gate driver | Capacitor between BOOST and SW provides floating rail; voltage swing = DRVCC to (VIN + DRVCC); max 150V rating. |
| DRVCC (Pin 15) | Gate driver supply output | Powered by internal VIN LDO, external NDRV NMOS LDO, or EXTVCC LDO; requires ≥4.7µF ceramic decoupling. |
| NDRV (Pin 16) | External NMOS pass device driver | Drives gate of external NFET for low-dropout DRVCC regulation; tie to DRVCC to disable; capacitive load only. |
| VIN (Pin 17) | Main input supply | 4V–140V input; bypass with low-ESR capacitor near IC; powers INTVCC LDO and internal logic. |
| EXTVCC (Pin 18) | External gate driver supply input | 0V–14V input; switchover occurs at 4.7V/7.7V (DRVUV-selectable); bypass with ≥1µF ceramic; tie to GND if unused. |
| INTVCC (Pin 20) | Internal 5V LDO output | Supplies analog/digital circuitry; ±3% tolerance; requires 0.1µF ceramic bypass close to pin; not for external loading. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across wide output capacitance (10µF–1000µF) and ESR (0.5mΩ–100mΩ) without external compensation redesign. |
| Integrated Charge Pump | Eliminates external bootstrap diode and enables true 100% duty cycle operation - essential for high-VIN, low-VOUT applications like 48V-to-12V conversion. |
| Programmable Light-Load Modes | Three selectable modes (Burst, Pulse-Skipping, Forced Continuous) optimize efficiency vs. ripple trade-off across 0.1mA–10A load range. |
| Multiple DRVCC Supply Options | Supports internal VIN LDO, external NDRV NMOS LDO, or EXTVCC LDO - allows flexible power architecture for high-efficiency or low-noise designs. |
| Robust Protection Suite | Includes input OVLO (programmable), RUN-controlled shutdown, PGOOD monitoring, and thermal shutdown - reduces need for external supervision circuits. |
Applications
| Telecom Power Supply | Industrial HV Battery System |
|---|---|
Use Scenario: 48V backplane-to-12V intermediate bus conversion in LTE base stations with strict efficiency and thermal requirements. IC Role / Device Role / Timing Role: Primary step-down controller managing synchronous N-MOSFETs; regulates 12V/5A output with 95% peak efficiency at 48VIN. Use Value: 40μA quiescent current minimizes standby loss; 140V abs-max rating accommodates 48V surge transients per GR-1089. | Use Scenario: 96V lithium-iron-phosphate battery pack powering motor drives and PLC I/O in factory automation equipment. IC Role / Device Role / Timing Role: High-voltage buck controller delivering regulated 24V/3A for control logic and sensors; operates down to 4V input during brownout. Use Value: 100% duty cycle capability maintains regulation during battery discharge to 24V; programmable 0.8V reference supports custom output scaling. |
| Automotive ADAS Camera Module | High-Voltage PoE++ Midspan |
Use Scenario: Compact 12V-to-3.3V/1.8V dual-rail supply for radar and camera ECUs in under-hood environments (–40°C to 125°C). IC Role / Device Role / Timing Role: Primary controller for first-stage 12V→5V conversion; feeds secondary LDOs; uses Burst Mode® for ultra-low idle power. Use Value: –40°C to 125°C guaranteed operation meets AEC-Q100 Grade 1; 40μA IQ extends battery run time during vehicle sleep mode. | Use Scenario: 57V PoE++ midspan injector supplying up to 90W to IEEE 802.3bt endpoints while maintaining isolation and thermal safety. IC Role / Device Role / Timing Role: Secondary-side synchronous buck controller regulating isolated 54V-to-51V auxiliary rail for PD interface management. Use Value: 140V input rating safely handles PoE open-circuit voltage (57V) plus worst-case ringing; phase-lockable frequency avoids EMI overlap with data signals. |
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 |
|---|---|---|---|
| LTC7803EFE#TRPBF | Higher 200V input rating; includes integrated MOSFET drivers with enhanced shoot-through protection; same 24-pin TSSOP package. | Preferred for >150V input systems (e.g., 270V avionics, 200V solar string inverters); supports wider gate drive range (4.5V–13.2V). | Select LTC7803EFE#TRPBF when input exceeds 140V or enhanced driver robustness is required; pin-compatible but not functionally identical due to different UVLO and protection thresholds. |
| LM5116PWPR | TI part with 100V max input; no integrated charge pump (requires external bootstrap diode); fixed 5V gate drive; 20-pin HTSSOP package. | Suitable for cost-sensitive 48V/60V systems where 100% duty cycle is not needed; lacks Burst Mode® and OPTI-LOOP®. | Choose LM5116PWPR for simpler, lower-cost 100V-class designs; requires layout changes due to different pin count, package, and missing charge pump functionality. |
Compared with LTC7803EFE#TRPBF and LM5116PWPR, the LTC7801EFE#TRPBF uniquely balances 140V operation, 100% duty cycle, ultra-low IQ, and flexible gate drive - making it optimal for space-constrained, high-efficiency 48V–96V industrial and telecom converters where thermal headroom and battery life are critical.
Availability
LTC7801EFE#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial HV battery systems, and automotive ADAS modules requiring stable component supply, extended temperature support (–40°C to 125°C), and long-term production continuity.
Supply support for LTC7801EFE#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and aerospace markets.
The LTC7801 belongs to Linear's high-voltage monolithic controller product line, designed specifically for efficient, reliable DC/DC conversion in harsh environments - emphasizing wide input range, low quiescent power, and robust protection for mission-critical power systems.
FAQ
What is the maximum input voltage rating for the LTC7801EFE#TRPBF?
The LTC7801EFE#TRPBF has an absolute maximum input voltage rating of 150V on the VIN pin, with a recommended operating range of 4V to 140V. This enables direct regulation from common high-voltage sources including 48V telecom, 96V battery stacks, and PoE++ infrastructure without pre-regulation stages. Operation beyond 140V risks exceeding safe operating area limits and is not guaranteed.
Does the LTC7801EFE#TRPBF support 100% duty cycle operation, and how is it enabled?
Yes, the LTC7801EFE#TRPBF supports true 100% duty cycle operation via its integrated charge pump. To enable it, tie the CPUMP_EN pin (Pin 7) to INTVCC. This activates the internal charge pump that sustains the BOOST rail during dropout conditions, allowing the top MOSFET to remain fully on. Disabling CPUMP_EN (tying to GND) limits duty cycle to 99%.
How does the OPTI-LOOP® compensation feature benefit system design with the LTC7801EFE#TRPBF?
OPTI-LOOP® compensation in the LTC7801EFE#TRPBF allows designers to optimize transient response across a wide range of output capacitor values (10µF–1000µF) and ESR (0.5mΩ–100mΩ) without modifying external compensation components. This simplifies design reuse, accelerates qualification, and improves reliability in applications where capacitor aging or temperature drift affects stability.
Can the LTC7801EFE#TRPBF drive both logic-level and standard-threshold MOSFETs?
Yes, the LTC7801EFE#TRPBF supports both logic-level and standard-threshold N-channel MOSFETs through its OPTI-DRIVE™ feature. The DRVSET pin (Pin 11) allows programming of the DRVCC gate drive voltage from 5V to 10V using a resistor divider - 5V for logic-level devices, 10V for standard-threshold FETs - maximizing efficiency and minimizing conduction losses across diverse FET selections.
What are the thermal considerations for the LTC7801EFE#TRPBF in TSSOP package?
The LTC7801EFE#TRPBF in 24-lead TSSOP (FE package) has a junction-to-ambient thermal resistance (θJA) of 33°C/W when the exposed pad (Pin 25) is properly soldered to a minimum 1-inch² copper pour on the PCB. For continuous 125°C operation, power dissipation must be limited to ≤2.1W (TJ = TA + PD × θJA). Thermal derating is required above 125°C ambient to maintain reliability.
LTC7801EFE#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
LTC7801EFE#TRPBF FAQ
1.How can I place an order for LTC7801EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7801EFE#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 LTC7801EFE#TRPBF reliable?
The price and inventory of LTC7801EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7801EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7801EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7801EFE#TRPBF transactions.
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4.How is shipping managed for LTC7801EFE#TRPBF?
LTC7801EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7801EFE#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 LTC7801EFE#TRPBF?
For technical support, including LTC7801EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7801EFE#TRPBF requirements.
6.How does Aetrix verify that LTC7801EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7801EFE#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 LTC7801EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7801EFE#TRPBF?
All LTC7801EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7801EFE#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 LTC7801EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7801EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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