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Analog Devices Inc. LTC3801ES6#TRMPBF
- Part No.:
- LTC3801ES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3801ES6#TRMPBF.pdf
- Description:
- IC REG CTRLR BUCK TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:985
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Product details
Overview
LTC3801ES6#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower, constant-frequency current-mode step-down DC/DC controller in a 6-lead SOT-23 (ThinSOT™) package. It regulates output voltages as low as 0.8V with ±1.5% reference accuracy, supports 2.4V–9.8V input, delivers up to 94% efficiency, and operates at 550kHz switching frequency - optimized for single/dual-cell Li-ion battery-powered portable electronics.
For engineers reviewing the LTC3801ES6#TRMPBF datasheet, LTC3801ES6#TRMPBF pinout, LTC3801ES6#TRMPBF application, or LTC3801ES6#TRMPBF equivalent, key selection considerations include its 16µA no-load quiescent current, Burst Mode® operation for light-load efficiency, 100% duty-cycle dropout capability, internal soft-start, and P-channel MOSFET gate drive with 1A peak sink/source capability.
Technical Context
The LTC3801ES6#TRMPBF implements current-mode control with a 550kHz fixed-frequency oscillator, slope-compensated peak-current sensing, and an error amplifier whose output (ITH/RUN pin) directly sets the MOSFET on-time via a voltage-controlled current limit. Its architecture enables fast transient response and stable regulation across wide line/load ranges.
It integrates undervoltage lockout (UVLO threshold: 1.7V–2.3V), overvoltage protection (trip at 0.85V–0.91V at VFB), short-circuit foldback (oscillator drops to ~210kHz), and a dedicated shutdown path via ITH/RUN ≤ 0.6V. The device enters Burst Mode® automatically below ~25% load, reducing quiescent current to 16µA while maintaining regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 9.8V - supports 1–2 cell Li-ion (fully charged to depleted) without external LDO pre-regulation. |
| Quiescent Current (No-Load) | 16µA - enables multi-week battery standby in portable devices with minimal self-discharge impact. |
| Switching Frequency | 550kHz (typ) - allows use of compact 1–4.7µH inductors and ceramic output capacitors. |
| Feedback Reference Voltage | 0.800V ±1.5% - sets precise output voltage via external resistor divider; enables 0.8V–>5V+ outputs. |
| Peak Current Sense Threshold | 117mV (typ) - determines maximum inductor current; scales with duty cycle via internal slope compensation. |
| PGATE Drive Capability | 1A peak sink/source - directly drives high-side P-MOSFET gates with fast 40ns rise/fall times. |
| Shutdown Current | 6µA (typ) - ultra-low power-off state for system-level power gating and wake-on-event designs. |
| Operating Temperature Range | –40°C to +85°C - qualified for industrial and extended commercial environments. |
Pinout & Package
Package: 6-lead SOT-23 (ThinSOT™), 1mm profile, JEDEC MO-178AC compliant. Pin 1 marked with dot; top-view orientation per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & run control | Controls peak inductor current; <0.6V forces shutdown; internal 1µA current source enables soft-start. |
| GND (Pin 2) | Power and signal ground reference | Common return for all internal circuits and external sense resistor; must be low-impedance connection. |
| VFB (Pin 3) | Feedback input | Compares output voltage (via resistor divider) to 0.8V reference; 2nA max input bias enables high-R dividers. |
| SENSE– (Pin 4) | Current sense negative input | Connects to low side of external RSENSE; senses voltage drop across sense resistor for current limiting. |
| VIN (Pin 5) | Main supply input | Powers internal circuitry and PGATE driver; requires local 10µF ceramic bypass to GND. |
| PGATE (Pin 6) | High-side P-MOSFET gate driver | Swings 0V to VIN; 1A peak drive capability ensures fast MOSFET turn-on/off and minimizes conduction losses. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces no-load IQ to 16µA while maintaining regulation - extends battery life in intermittent-use devices. |
| 100% duty-cycle dropout | Enables VOUT regulation even when VIN ≈ VOUT by holding P-MOSFET fully on - critical for Li-ion end-of-discharge operation. |
| Internal soft-start | 0.6ms default timing - prevents inrush current and output overshoot during power-up or recovery from shutdown. |
| Low-profile ThinSOT™ package | 1mm max height, 6-pin SOT-23 footprint - enables space-constrained PCB layouts in ultra-thin portable systems. |
| Overvoltage & short-circuit protection | VFB >0.85V disables PGATE; short-circuit folds oscillator to 210kHz - protects load and power stage under fault conditions. |
Applications
| Wireless Sensor Node Power | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered BLE/Wi-Fi sensor node operating intermittently with 10-second wake cycles and 5-minute sleep intervals. IC Role / Device Role / Timing Role: Primary step-down controller regulating 3.3V rail from 3.6V Li-ion; manages burst-mode transitions and low-IQ sleep states. Use Value: 16µA no-load IQ extends 200mAh coin-cell life beyond 18 months; 550kHz switching enables miniature 2.2µH inductor and 10µF ceramic output cap. |
Use Scenario: Handheld ECG monitor requiring stable 2.5V analog front-end supply and low-noise 1.8V digital core rail. IC Role / Device Role / Timing Role: High-accuracy 2.5V buck controller with ±1.5% VREF; supplies ADC reference and op-amp bias rails. Use Value: 0.8V reference and tight line/load regulation ensure <±1mV output drift across battery discharge; 100% duty cycle maintains regulation down to 2.7V input. |
| Industrial Handheld Terminal | Distributed Point-of-Load Converter |
Use Scenario: Ruggedized barcode scanner powered by 2-cell Li-ion (4.2V–3.0V), requiring 3.3V logic rail with ESD-hardened I/O. IC Role / Device Role / Timing Role: Main system power controller with UVLO (1.7V) and thermal-safe shutdown; interfaces to external P-MOSFET and Schottky catch diode. Use Value: Wide 2.4V–9.8V input range accommodates full battery swing plus surge transients; 1A PGATE drive ensures robust MOSFET switching under cold-temperature conditions. |
Use Scenario: FPGA-based edge AI module needing localized 1.2V/3A supply with fast transient response and minimal board area. IC Role / Device Role / Timing Role: Current-mode controller driving discrete P-MOSFET and custom inductor; provides tight load regulation during logic state changes. Use Value: Current-mode architecture delivers <50µs load transient recovery; 550kHz operation allows 1.5µH inductor and reduces output capacitor count by 40% vs 300kHz alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3971EDD#TRPBF | Higher 3.6V–36V input range; integrated 3.3A DMOS switch; no P-MOSFET requirement; 2.2MHz switching. | Replaces discrete FET + controller solution; better suited for higher input voltages and space-constrained designs where integration is preferred. | Select LT3971EDD#TRPBF when board area is limited and input exceeds 10V; not suitable for sub-3V operation or 100% duty-cycle dropout. |
| TPS54202DRCT | 2.9V–17V input; integrated N-MOSFET; 450kHz switching; 3.5µA shutdown IQ; no Burst Mode®. | Requires external bootstrap capacitor; lower no-load IQ but no light-load efficiency optimization; N-MOSFET topology limits minimum VIN-to-VOUT differential. | Choose TPS54202DRCT for cost-sensitive industrial supplies above 3V input; avoid where 100% duty cycle or <3V operation is required. |
Compared with LT3971EDD#TRPBF and TPS54202DRCT, the LTC3801ES6#TRMPBF uniquely combines ultra-low 16µA no-load IQ, true 100% duty-cycle operation, and P-MOSFET compatibility - making it irreplaceable in deep-discharge Li-ion systems demanding maximum runtime and minimal BOM count.
Availability
LTC3801ES6#TRMPBF is available at Aetrix Electronics and suitable for portable medical monitors, wireless sensor nodes, industrial handheld terminals, and distributed point-of-load converters requiring stable component supply with long-term lifecycle support.
Supply support for LTC3801ES6#TRMPBF 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 and maintains full product continuity, technical documentation, and manufacturing for all Linear ICs including the LTC series.
The LTC3801ES6#TRMPBF belongs to Linear's micropower DC/DC controller family, designed specifically for battery-operated portable electronics requiring high light-load efficiency, minimal quiescent current, and seamless dropout behavior.
FAQ
What is the function of the ITH/RUN pin on the LTC3801ES6#TRMPBF?
The ITH/RUN pin on the LTC3801ES6#TRMPBF serves dual roles: it is the output of the internal error amplifier (setting peak inductor current) and the run control input. Pulling it below 0.6V shuts down the device, while releasing it allows an internal 1µA current source to charge the external compensation network. During normal operation, the LTC3801ES6#TRMPBF uses this pin to regulate output voltage dynamically; in Burst Mode®, it clamps to maintain light-load efficiency. This pin is essential for soft-start, shutdown, and loop stability.
Does the LTC3801ES6#TRMPBF support 100% duty-cycle operation, and how does it behave in dropout?
Yes, the LTC3801ES6#TRMPBF supports true 100% duty-cycle operation. When input voltage approaches the output voltage, the external P-channel MOSFET remains continuously on, allowing VOUT to track VIN minus small drops across RSENSE, MOSFET RDS(ON), and inductor DCR. This dropout behavior ensures uninterrupted regulation down to VIN ≈ VOUT, critical for Li-ion batteries discharging from 4.2V to 2.7V. The LTC3801ES6#TRMPBF maintains control throughout without oscillation or dropout-induced instability.
How does Burst Mode® operation improve efficiency at light loads in the LTC3801ES6#TRMPBF?
Burst Mode® operation in the LTC3801ES6#TRMPBF reduces no-load quiescent current from 195µA (normal mode) to just 16µA by temporarily disabling switching and entering a low-power sleep state when load current falls below ~25% of maximum. During sleep, only essential bias currents remain active. The LTC3801ES6#TRMPBF wakes periodically to sample output voltage and resumes switching only if regulation error exceeds threshold - dramatically extending battery life in standby or intermittent-use applications without sacrificing regulation accuracy.
What is the maximum output current achievable with the LTC3801ES6#TRMPBF, and what limits it?
The LTC3801ES6#TRMPBF itself does not set a fixed maximum output current; instead, it controls an external P-channel MOSFET whose current capability defines the system limit. Peak inductor current is determined by the 117mV (typ) current-sense threshold and RSENSE value. Practical output current depends on MOSFET RDS(ON), inductor saturation rating, thermal design, and PCB layout. With appropriate component selection, the LTC3801ES6#TRMPBF has been used to deliver >3A continuous output in validated reference designs - limited only by external components and thermal management, not the controller IC itself.
Can the LTC3801ES6#TRMPBF be used with an N-channel MOSFET instead of a P-channel MOSFET?
No, the LTC3801ES6#TRMPBF is specifically designed to drive external P-channel MOSFETs only. Its PGATE pin sources and sinks current relative to VIN, producing a gate-to-source voltage that turns on a P-MOSFET when PGATE = VIN (VGS = 0V) and turns it off when PGATE ≈ 0V (VGS ≈ –VIN). An N-channel MOSFET would require a bootstrap or charge-pump gate driver to achieve sufficient VGS - functionality not provided by the LTC3801ES6#TRMPBF. Using an N-MOSFET would result in incorrect switching behavior and potential damage. The LTC3801ES6#TRMPBF requires a P-channel high-side switch.
LTC3801ES6#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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):
- 2.4V ~ 9.8V
- Frequency - Switching:
- 550kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC3801ES6#TRMPBF FAQ
1.How can I place an order for LTC3801ES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3801ES6#TRMPBF 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 LTC3801ES6#TRMPBF reliable?
The price and inventory of LTC3801ES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3801ES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3801ES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3801ES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3801ES6#TRMPBF?
LTC3801ES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3801ES6#TRMPBF 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 LTC3801ES6#TRMPBF?
For technical support, including LTC3801ES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3801ES6#TRMPBF requirements.
6.How does Aetrix verify that LTC3801ES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3801ES6#TRMPBF 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 LTC3801ES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3801ES6#TRMPBF?
All LTC3801ES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3801ES6#TRMPBF, 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 LTC3801ES6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3801ES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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