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Analog Devices Inc. LTC3801BES6#TRMPBF
- Part No.:
- LTC3801BES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3801BES6#TRMPBF.pdf
- Description:
- IC REG CTRLR BUCK TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:882
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Product details
Overview
LTC3801BES6#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 delivers up to 94% efficiency, supports 2.4V–9.8V input, regulates output down to 0.8V with ±1.5% reference accuracy, and operates at 550kHz for compact magnetics-targeted for battery-powered portable computers and wireless devices.
For engineers reviewing the LTC3801BES6#TRMPBF datasheet, LTC3801BES6#TRMPBF pinout, LTC3801BES6#TRMPBF application, or LTC3801BES6#TRMPBF equivalent, key selection criteria include its Burst Mode–disabled operation (lower light-load ripple), 100% duty cycle dropout capability, 16µA no-load quiescent current, P-channel gate drive architecture, and precise 0.8V feedback reference with 10nA input bias.
Technical Context
The LTC3801BES6#TRMPBF implements fixed-frequency current-mode control with internal slope compensation active above 40% duty cycle. Its error amplifier output (ITH/RUN pin) directly sets peak inductor current via a 104mV current-sense threshold, and it disables Burst Mode to maintain constant 550kHz switching under light loads-reducing low-frequency output ripple versus the LTC3801 variant.
It integrates undervoltage lockout (UVLO) with 1.7V–2.2V hysteresis, overvoltage protection (0.85V–0.91V trip at VFB), short-circuit frequency foldback to 210kHz, and soft-start with 0.6ms default timing. The PGATE driver delivers 1A peak current with 40ns rise/fall times into 3000pF load, optimized for external P-channel MOSFETs with sub-2.5V VGS(th).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550kHz typical - enables use of small, low-profile inductors (e.g., 4.7µH) without sacrificing regulation bandwidth. |
| Input Voltage Range | 2.4V to 9.8V - supports single/dual Li-ion batteries and wide-input industrial rails. |
| Feedback Reference | 0.800V ±1.5% (–40°C to 85°C) - ensures stable output voltage setting across temperature with minimal divider current error. |
| No-Load Quiescent Current | 16µA - extends battery runtime in standby or sleep modes of portable systems. |
| Peak Current Sense Threshold | 104mV (LTC3801B) - defines maximum inductor current limit; lower than LTC3801's 117mV for tighter light-load regulation. |
| Duty Cycle Capability | 100% - maintains regulation during input voltage droop (e.g., battery discharge), with external P-MOSFET fully enhanced. |
| Shutdown Supply Current | 8µA max - minimizes system-level leakage when disabled via ITH/RUN pin. |
Pinout & Package
Package: 6-lead plastic TSOT-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 | Drives external compensation network; <0.6V forces shutdown; internal 2µA current source charges soft-start capacitor on wake-up. |
| GND (Pin 2) | Analog and power ground | Common return for feedback, sense, and internal bias; must be low-impedance connection to minimize noise coupling. |
| VFB (Pin 3) | Feedback input | Compares output voltage (via resistor divider) to 0.8V reference; 10nA input bias enables high-impedance dividers for ultra-low IQ. |
| SENSE– (Pin 4) | Current sense negative input | Connects to low-side of external sense resistor; monitors inductor current for cycle-by-cycle peak limiting. |
| VIN (Pin 5) | Power supply input | Bias rail for internal circuitry and PGATE driver; requires local 10µF ceramic decoupling to GND. |
| PGATE (Pin 6) | P-channel MOSFET gate driver | Swings 0V to VIN; delivers 1A peak current with fast 40ns edges to minimize switching losses in external FET. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode disabled | Ensures constant 550kHz operation down to 5% load - eliminates audible noise and reduces output ripple (17.6mVP-P at 100mA vs 81.6mVP-P for LTC3801). |
| 100% duty cycle dropout | Allows seamless transition to linear regulation as input approaches output - critical for Li-ion battery end-of-discharge support. |
| Low-noise 0.8V reference | ±1.5% accuracy over –40°C to 85°C with 0.05mV/V line regulation - enables stable 2.5V, 3.3V, or custom outputs using standard resistors. |
| Integrated UVLO & OVP | UVLO threshold 1.7V–2.2V (hysteresis); OVP trips at 0.85V–0.91V at VFB - protects downstream circuitry during fault conditions without external components. |
| Fast gate drive | 40ns rise/fall into 3000pF - reduces external MOSFET switching losses and improves transient response in high-current designs. |
Applications
| Portable Computers | Wireless Communication Modules |
|---|---|
Use Scenario: Power management in ultraportable laptops and tablets with dual-cell Li-ion batteries (up to 8.4V) requiring clean, low-noise 1.8V or 2.5V core logic rails. IC Role / Device Role / Timing Role: Step-down DC/DC controller regulating processor I/O and memory interfaces with tight voltage tolerance and minimal standby current draw. Use Value: 16µA no-load IQ extends battery life in suspend mode; constant-frequency operation avoids interference with RF receivers. |
Use Scenario: Voltage conversion for Bluetooth/Wi-Fi SoCs operating from single-cell Li-ion (3.0–4.2V) with strict EMI limits and bursty traffic patterns. IC Role / Device Role / Timing Role: Primary power controller delivering regulated 3.3V to transceiver ICs, with fast load-step response and low output ripple during packet transmission. Use Value: 550kHz switching allows compact LC filter design; disabled Burst Mode prevents low-frequency ripple that could modulate RF carrier signals. |
| Distributed Power Systems | Industrial Handheld Terminals |
Use Scenario: Local point-of-load regulation in multi-rail embedded systems where main 5V/12V bus supplies intermediate 3.3V or 2.5V domains. IC Role / Device Role / Timing Role: Standalone controller driving discrete P-MOSFETs to replace integrated buck modules-enabling thermal separation and layout flexibility. Use Value: 100% duty cycle operation sustains output during brownouts; wide 2.4V–9.8V input accommodates aging or mismatched upstream supplies. |
Use Scenario: Battery-backed operation in ruggedized barcode scanners and RFID readers powered by 1–2 Li-ion cells with frequent deep discharge cycles. IC Role / Device Role / Timing Role: Main system regulator maintaining stable 3.3V for microcontroller, display, and sensor interface despite input sag below 3V. Use Value: Undervoltage lockout (1.7V) prevents erratic MCU behavior; low 8µA shutdown current preserves backup battery charge during storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3801ES6#TRMPBF | Burst Mode enabled; 117mV current-sense threshold; 1µA ITH/RUN start-up current. | Higher light-load efficiency but greater output ripple (81.6mVP-P at 100mA); suitable where battery runtime > ripple sensitivity. | Select LTC3801ES6#TRMPBF only if minimizing no-load power is prioritized over ripple performance. |
| TPS40210DGQ | Fixed 500kHz frequency; N-channel MOSFET driver; requires bootstrap capacitor; 2.95–20V input. | Supports higher input voltages and N-MOSFETs (lower RDS(on)), but adds complexity and lacks 100% duty cycle. | Choose TPS40210DGQ for cost-sensitive, non-battery applications needing >9.8V input or higher output current. |
Compared with LTC3801ES6#TRMPBF, the LTC3801BES6#TRMPBF trades light-load efficiency for significantly lower output ripple and deterministic frequency behavior; versus TPS40210DGQ, it offers simpler P-MOSFET drive and true dropout capability but narrower input range and no N-MOSFET optimization.
Availability
LTC3801BES6#TRMPBF is available at Aetrix Electronics and suitable for portable computers, wireless communication modules, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.
Supply support for LTC3801BES6#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, documentation, and technical support for all Linear power management ICs.
The LTC3801BES6#TRMPBF belongs to Linear's micropower DC/DC controller family, designed specifically for space-constrained, battery-operated systems demanding ultra-low quiescent current, high light-load efficiency, and robust dropout performance.
FAQ
What is the key functional difference between LTC3801BES6#TRMPBF and LTC3801ES6#TRMPBF?
The LTC3801BES6#TRMPBF disables Burst Mode operation to maintain constant 550kHz switching under light loads, reducing output ripple (e.g., 17.6mVP-P at 100mA) versus the LTC3801ES6#TRMPBF's Burst Mode (81.6mVP-P). This comes with slightly lower light-load efficiency but eliminates low-frequency noise-critical for RF-sensitive applications. Both share identical pinout, package, and core control architecture.
Does LTC3801BES6#TRMPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3801BES6#TRMPBF supports true 100% duty cycle operation. When input voltage drops near the output level, the internal control logic holds PGATE high continuously, allowing the external P-channel MOSFET to conduct DC-maintaining regulation without dropout. This is essential for Li-ion battery applications where VIN may fall to 2.7V while powering a 2.5V rail.
What is the recommended external P-channel MOSFET VGS(th) for reliable startup with LTC3801BES6#TRMPBF?
For reliable operation down to the minimum 2.4V input, select a P-channel MOSFET with VGS(th) ≤ –1.5V (guaranteed at VGS = –2.5V). Sublogic-level devices (e.g., Si2301, DMG2301U) ensure full enhancement even at low VIN. Avoid MOSFETs requiring |VGS(th)| > –2.0V, as gate drive margin shrinks below 3V input.
Can LTC3801BES6#TRMPBF regulate output voltages below 0.8V?
No-the LTC3801BES6#TRMPBF has a fixed 0.8V internal reference and cannot regulate below this threshold. Output voltage is set by VOUT = 0.8V × (1 + R1/R2); the lowest practical output is ~0.8V (with R2 = 0Ω, not recommended). For sub-0.8V rails, consider a controller with adjustable reference or external reference injection-neither supported by LTC3801BES6#TRMPBF.
How does the LTC3801BES6#TRMPBF handle short-circuit conditions on the output?
Under output short-circuit, the LTC3801BES6#TRMPBF activates frequency foldback-reducing oscillator frequency from 550kHz to ~210kHz while preserving minimum on-time. This lowers peak inductor current and prevents thermal runaway. Once the short is removed, frequency ramps back to 550kHz as VFB recovers through 0.3V toward 0.8V, ensuring safe, controlled recovery without latch-off.
LTC3801BES6#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
LTC3801BES6#TRMPBF FAQ
1.How can I place an order for LTC3801BES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3801BES6#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 LTC3801BES6#TRMPBF reliable?
The price and inventory of LTC3801BES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3801BES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3801BES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3801BES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3801BES6#TRMPBF?
LTC3801BES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3801BES6#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 LTC3801BES6#TRMPBF?
For technical support, including LTC3801BES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3801BES6#TRMPBF requirements.
6.How does Aetrix verify that LTC3801BES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3801BES6#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 LTC3801BES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3801BES6#TRMPBF?
All LTC3801BES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3801BES6#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 LTC3801BES6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3801BES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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