My Inquiry
My Account
Analog Devices Inc. LTC7801IFE#PBF
- Part No.:
- LTC7801IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7801IFE#PBF.pdf
- Description:
- IC REG CTRLR SYNC BUCK 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:333
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC7801IFE#PBF from Analog Devices is a high-voltage, low-quiescent-current synchronous step-down DC/DC controller driving all-N-channel MOSFETs with input voltage up to 140V, 0.8V–60V programmable output, and 40μA no-load IQ. It features OPTI-LOOP® compensation, phase-lockable 75kHz–850kHz operation, and 100% duty cycle capability via integrated charge pump - deployed in industrial power supplies and high-voltage battery systems.
For engineers reviewing the LTC7801IFE#PBF datasheet, LTC7801IFE#PBF pinout, LTC7801IFE#PBF application, or LTC7801IFE#PBF equivalent, key selection criteria include its 140V max VIN rating, adjustable 5V–10V gate drive (OPTI-DRIVE), selectable light-load modes (Burst Mode®, pulse-skipping, forced continuous), precision 0.8V reference, and PGOOD indicator for system monitoring.
Technical Context
The LTC7801IFE#PBF implements constant-frequency current-mode control with an internal transconductance error amplifier (gm = 2 mmho) and programmable oscillator (50kHz–900kHz). Its dual-path DRVCC regulation supports internal VIN LDO, external NMOS NDRV LDO, or EXTVCC-sourced supply - enabling flexible high-efficiency gate drive across wide input ranges.
It integrates a charge pump for BOOST supply generation, eliminating external bootstrap diodes, and includes differential current sensing (SENSE+/SENSE–) with 66mV–84mV programmable threshold. The device supports three light-load operating modes selected via MODE pin voltage and features programmable UVLO/OVLO thresholds with hysteresis for robust fault protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - enables direct conversion from 48V telecom, 72V industrial, or 100V+ battery stacks without pre-regulation. |
| Output Voltage Range | 0.8V to 60V - set by external resistor divider; supports 12V, 24V, 48V system rails and intermediate logic supplies. |
| No-Load Quiescent Current | 40μA - extends runtime in always-on battery-powered equipment such as remote sensors or backup power modules. |
| Switching Frequency Range | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and compact magnetics design while maintaining stable loop response. |
| Feedback Reference Voltage | 0.800V ±0.8mV (0°C–85°C) - high-precision reference enables accurate output regulation across temperature and load conditions. |
| Gate Drive Voltage Range | 5V to 10V (programmable via DRVSET) - matches logic-level or standard-threshold MOSFETs to minimize conduction losses. |
| Current Sense Threshold | 66mV to 84mV (adjustable via ITH) - enables precise overcurrent protection and accurate peak-current mode control. |
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 connection | Accepts 4V–140V input; bypassed to GND with ceramic capacitor for stability and noise suppression. |
| TG (Pin 13) | Top-gate driver output | Floating high-side driver delivering DRVCC-referenced swing to top N-MOSFET gate; requires BOOST–SW capacitor. |
| SW (Pin 14) | Switch node | Connection point between top/bottom MOSFETs and inductor; critical for layout to minimize ringing and EMI. |
| BG (Pin 16) | Bottom-gate driver output | Ground-referenced driver for synchronous rectifier; complements TG to enable 100% duty cycle operation. |
| SENSE+ / SENSE– (Pins 24/1) | Differential current sense inputs | Measure voltage across external sense resistor; enable accurate peak-current limiting and cycle-by-cycle protection. |
| VFB (Pin 1) | Feedback input | Compares divided output voltage against 0.8V internal reference; sets regulated output via external resistor divider. |
| PGOOD (Pin 9) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from target - used for sequencing, fault signaling, or system enable. |
| RUN (Pin 21) | Enable/shutdown control | Active-high; <1.12V disables switching, <0.7V enters ultra-low-IQ shutdown (10μA). |
| DRVSET (Pin 11) | DRVCC regulation programming | Sets gate drive voltage (5V–10V) via resistor-to-GND; determines MOSFET threshold compatibility and RDS(on) loss. |
| CPUMP_EN (Pin 7) | Charge pump enable | High = enables charge pump for 100% duty cycle in dropout; low = enables boost refresh for 99% duty cycle. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows loop stability optimization across wide output capacitance (10µF–1000µF) and ESR ranges without external compensation redesign. |
| Integrated Charge Pump | Eliminates external bootstrap diode and enables true 100% duty cycle operation during input voltage dropout conditions. |
| Three Light-Load Modes | Selectable Burst Mode®, pulse-skipping, or forced continuous via MODE pin - balances efficiency vs. output ripple per application need. |
| Programmable Gate Drive UVLO | DRVUV pin selects dual-threshold UVLO (4.0V/7.5V or 3.6V/6.4V) to match MOSFET gate requirements and prevent shoot-through. |
| Multi-Source DRVCC Regulation | Supports internal VIN LDO, external NMOS NDRV LDO, or EXTVCC-sourced LDO - improves efficiency and thermal management at high VIN. |
Applications
| Industrial Power Supplies | Telecom Rectifiers |
|---|---|
Use Scenario: 48V–72V input converted to 12V/24V for PLCs, HMIs, and motor drives in factory automation. IC Role / Device Role: Primary step-down controller managing high-voltage input with precise current-mode regulation and fault protection. Use Value: 140V absolute max rating avoids input transient derating; 40μA IQ reduces standby power in unattended equipment. |
Use Scenario: -48V telecom distribution systems requiring efficient, reliable 3.3V/5V/12V secondary rails. IC Role / Device Role: High-efficiency synchronous buck controller supporting hot-swap, sequencing, and PGOOD reporting. Use Value: Phase-lockable frequency synchronizes with system clock to reduce conducted EMI; PGOOD enables safe power-up sequencing. |
| High-Voltage Battery Systems | Automotive Off-Battery Power |
Use Scenario: 60V–100V LiFePO₄ or lead-acid battery packs powering onboard instrumentation or telemetry units. IC Role / Device Role: Input-tolerant DC/DC controller delivering stable low-noise outputs under wide battery SOC and temperature variation. Use Value: Wide 0.8V–60V output range supports multiple rail configurations; 100% duty cycle maintains regulation during deep discharge. |
Use Scenario: 24V commercial vehicle auxiliary systems (e.g., ADAS cameras, infotainment) powered directly from starter battery. IC Role / Device Role: Robust buck controller surviving cold-crank (4.5V) and load-dump (120V+) transients without external protection. Use Value: Programmable OVLO/UVLO thresholds enable custom fault response; EXTVCC option allows local 12V bias for improved gate drive efficiency. |
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 |
|---|---|---|---|
| LTC7803IFE#PBF | Higher max frequency (1MHz), lower IQ (25μA), integrated MOSFET drivers with faster transition times (12ns rise/fall). | Optimized for higher-density, higher-frequency designs where board space and switching loss dominate. | Choose LTC7803IFE#PBF when targeting >500kHz operation with tighter EMI constraints and lower quiescent power. |
| LM5116MH/NOPB | Wider VIN range (6V–100V), fixed 100kHz–1MHz frequency, no charge pump (max 98% duty cycle), no OPTI-LOOP®. | Designed for cost-sensitive industrial converters where 100% duty cycle is not required and loop tuning is acceptable. | Choose LM5116MH/NOPB for simpler, lower-cost implementations where 140V tolerance and ultra-low IQ are not mandatory. |
Compared with LTC7801IFE#PBF, LTC7803IFE#PBF delivers higher frequency and lower IQ but lacks the same level of gate drive flexibility and 100% duty cycle assurance; LM5116MH/NOPB offers broader vendor support and lower unit cost but sacrifices high-voltage margin and advanced light-load efficiency features.
Availability
LTC7801IFE#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 temperature-grade performance (–40°C to 125°C).
Supply support for LTC7801IFE#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 LTC7801IFE#PBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-input-voltage, high-efficiency synchronous buck conversion in harsh environments where reliability, wide operating range, and low standby power are critical.
FAQ
What is the maximum input voltage rating for the LTC7801IFE#PBF?
The LTC7801IFE#PBF 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 interface with 48V, 72V, and 100V+ battery or rectified AC systems without pre-regulation stages. Operation above 140V is limited by internal clamp structures and thermal constraints - sustained use beyond 140V may compromise reliability or lifetime.
Does the LTC7801IFE#PBF support 100% duty cycle operation, and how is it enabled?
Yes, the LTC7801IFE#PBF supports true 100% duty cycle operation via its integrated charge pump. To enable this feature, the CPUMP_EN pin (Pin 7) must be tied to INTVCC. When active, the charge pump generates the BOOST voltage needed to fully enhance the top N-MOSFET even when VIN ≈ VOUT - essential for maintaining regulation during input voltage dropout events in battery-powered systems.
How does the OPTI-LOOP® compensation work in the LTC7801IFE#PBF?
OPTI-LOOP® in the LTC7801IFE#PBF dynamically adjusts the error amplifier's transconductance and pole-zero placement based on external output capacitance and ESR values. By connecting a single capacitor from the ITH pin to ground, designers can stabilize the control loop across wide capacitor types (ceramic, polymer, electrolytic) and values (10µF–1000µF) without recalculating compensation networks - significantly reducing design iteration time.
Can the LTC7801IFE#PBF drive both logic-level and standard-threshold MOSFETs?
Yes, the LTC7801IFE#PBF supports both logic-level and standard-threshold N-channel MOSFETs through its programmable gate drive voltage (5V–10V), set by the DRVSET pin. A resistor from DRVSET to GND selects intermediate voltages (e.g., 6.4V or 9.0V), allowing optimal RDS(on) utilization and minimizing conduction losses across diverse FET families - unlike fixed-drive controllers that force trade-offs between speed and gate loss.
What are the key differences between the LTC7801IFE#PBF and LTC7803IFE#PBF?
The LTC7803IFE#PBF extends the LTC7801IFE#PBF's architecture with higher maximum frequency (1MHz vs. 850kHz), lower no-load IQ (25μA vs. 40μA), and faster gate drivers (12ns vs. 25ns rise time). However, LTC7801IFE#PBF retains advantages in gate drive flexibility (wider DRVCC range), charge pump robustness, and broader temperature-grade availability - making it preferred for high-reliability, high-voltage industrial applications.
LTC7801IFE#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
LTC7801IFE#PBF FAQ
1.How can I place an order for LTC7801IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7801IFE#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 LTC7801IFE#PBF reliable?
The price and inventory of LTC7801IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7801IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7801IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7801IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7801IFE#PBF?
LTC7801IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7801IFE#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 LTC7801IFE#PBF?
For technical support, including LTC7801IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7801IFE#PBF requirements.
6.How does Aetrix verify that LTC7801IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7801IFE#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 LTC7801IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7801IFE#PBF?
All LTC7801IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7801IFE#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 LTC7801IFE#PBF part is unused and in its original packaging.
Return procedure for LTC7801IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC7801IFE#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…
