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Analog Devices Inc. LTC3801BES6#TRPBF
- Part No.:
- LTC3801BES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3801BES6#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,978
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Product details
Overview
LTC3801BES6#TRPBF 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 operates from 2.4V to 9.8V input, delivers up to 2A output current with 0.8V reference accuracy (±1.5%), and features 550kHz fixed switching frequency and disabled Burst Mode for low-output-ripple operation in portable Li-ion battery-powered systems.
For engineers reviewing the LTC3801BES6#TRPBF datasheet, LTC3801BES6#TRPBF pinout, LTC3801BES6#TRPBF application, or LTC3801BES6#TRPBF equivalent, key selection considerations include its 16µA no-load quiescent current (LTC3801B), 100% duty-cycle dropout capability, P-channel MOSFET gate drive, and precise 0.8V feedback reference with ±1.5% tolerance over –40°C to 85°C.
Technical Context
The LTC3801BES6#TRPBF implements current-mode control with external P-channel MOSFET drive, using peak-current sensing via SENSE– and error amplifier output at ITH/RUN to regulate output voltage. Its 550kHz oscillator enables compact magnetics while maintaining stable constant-frequency operation even at ≤5% of full load-unlike the Burst Mode-enabled LTC3801.
Unlike the LTC3801, the LTC3801BES6#TRPBF disables Burst Mode to eliminate low-frequency ripple artifacts; instead, it uses cycle-skipping at light loads while preserving 550kHz clock integrity. It integrates undervoltage lockout (UVLO threshold: 1.7V–2.3V), overvoltage protection (0.85V–0.91V at VFB), and soft-start (0.6ms default) with internal clamping and slope compensation for duty cycles >40%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 9.8V - supports single/dual-cell Li-ion, USB, and distributed 3.3V/5V rails without external regulators. |
| Switching Frequency | 550kHz (typ) - enables use of sub-5mm inductors and reduces EMI filtering burden vs lower-frequency controllers. |
| Feedback Reference | 0.800V ±1.5% (–40°C to 85°C) - ensures tight output regulation across temperature for precision 2.5V/3.3V/5V rails. |
| No-Load Quiescent Current | 16µA (typ) - extends battery runtime in always-on portable devices such as wireless sensors and wearables. |
| Peak Current Sense Voltage | 104mV (typ) - sets current limit with high accuracy; lower than LTC3801's 117mV, enabling tighter overcurrent margin control. |
| Shutdown Supply Current | 8µA (typ) - minimizes standby power loss during system sleep modes. |
| Duty Cycle Range | 0% to 100% - supports dropout operation where VIN ≈ VOUT, critical for battery end-of-discharge scenarios. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive cabin-ambient environments. |
Pinout & Package
Package: 6-lead SOT-23 (ThinSOT™), 1mm max height, JEDEC MO-178AC compliant. RoHS-compliant, Pb-free, halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output / Run control input | Voltage at this pin sets peak inductor current; pulling below 0.6V forces shutdown; internal 2µA current source charges external compensation network on wake-up. |
| GND (Pin 2) | Power and signal ground reference | Must be low-impedance connection to PCB ground plane; serves as return path for sense resistor and gate drive current. |
| VFB (Pin 3) | Feedback input | Compares divided output voltage against 0.8V internal reference; <10nA input bias enables high-impedance dividers for ultra-low IQ designs. |
| SENSE– (Pin 4) | Current sense negative input | Connects to low-side of external sense resistor; differential sensing rejects common-mode noise from high di/dt switching node. |
| VIN (Pin 5) | Main supply input | Accepts 2.4V–9.8V; requires local 10µF ceramic bypass capacitor; powers internal circuitry and PGATE driver. |
| PGATE (Pin 6) | P-channel MOSFET gate driver output | Drives external P-MOSFET gate from 0V to VIN; 1A peak sink/source capability supports fast turn-on/turn-off with minimal dead-time loss. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency 550kHz operation | Enables predictable EMI filtering and eliminates audible noise; maintains frequency stability down to 5% load without Burst Mode artifacts. |
| 100% duty cycle dropout mode | Extends usable battery life by regulating output when VIN drops to within ~100mV of VOUT, avoiding premature system brownout. |
| 0.8V ±1.5% reference with <10nA VFB bias | Supports accurate low-voltage outputs (e.g., 0.8V core rails) and permits >400kΩ feedback dividers to minimize divider current vs. IC quiescent draw. |
| Integrated UVLO (1.7V–2.3V) | Prevents erratic startup or MOSFET misfiring during weak battery conditions; draws only ~1µA in lockout state. |
| Internal soft-start (0.6ms) | Controls inrush current into output capacitors; prevents overshoot and stress on downstream components during power-up. |
| Overvoltage protection (0.85V–0.91V at VFB) | Clamps PGATE off if feedback exceeds regulation point by >10%, protecting load from fault-induced overvoltage events. |
Applications
| Portable Medical Sensors | Wireless IoT Endpoints |
|---|---|
Use Scenario: Battery-powered pulse oximeter with Bluetooth LE connectivity operating from 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Step-down controller generating stable 3.3V rail for MCU, BLE radio, and analog front-end; manages transition from full charge (4.2V) to end-of-life (2.8V). Use Value: 16µA no-load IQ preserves weeks of shelf life; 100% duty cycle maintains regulation until battery hits 2.8V; low 17.6mVP-P ripple at 100mA avoids ADC noise coupling. | Use Scenario: Sub-GHz sensor node harvesting energy from ambient RF or solar, storing in supercapacitor, powering ultra-low-power MCU. IC Role / Device Role / Timing Role: Primary DC/DC controller converting variable 2.4V–9.8V storage voltage to regulated 1.8V or 2.5V logic rail with minimal quiescent overhead. Use Value: 8µA shutdown current enables multi-year deployment; ±1.5% VREF ensures reliable brown-out detection; SOT-23 footprint saves space in coin-cell-sized modules. |
| Industrial Handheld Terminals | Distributed Power in Test Equipment |
Use Scenario: Ruggedized barcode scanner with LCD backlight, imager, and Wi-Fi module powered by dual-cell Li-ion (7.4V nominal). IC Role / Device Role / Timing Role: Generates 5V rail for backlight LED driver and 3.3V for processor/FPGA; handles wide VIN transients during hot-swap battery insertion. Use Value: 550kHz switching allows small 2.2µH inductor; UVLO prevents malfunction during battery swap; 500–650kHz oscillator tolerance accommodates component drift without frequency shift. | Use Scenario: Modular bench power supply with isolated auxiliary rails for analog front-ends and digital control logic. IC Role / Device Role / Timing Role: Local point-of-load controller deriving ±12V or 15V from main 24V bus; operates alongside other LTC3801B units in parallel configurations. Use Value: Current-mode architecture provides inherent load sharing stability; cycle-skipping at light loads avoids beat frequencies between multiple controllers; SOT-23 thermal resistance (θJA = 230°C/W) suits forced-air-cooled enclosures. |
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#TRPBF | Burst Mode enabled; 26mV peak sense in Burst Mode; 6µA shutdown current; 1µA ITH/RUN start-up source. | Better light-load efficiency (>90% at 1mA), but higher output ripple (81.6mVP-P at 100mA); suited for energy-harvesting where ripple is filtered externally. | Select LTC3801ES6#TRPBF only if lowest possible no-load power dominates over ripple-sensitive analog performance. |
| TPS54202DRCT | Integrated N-MOSFET; 4.5V–17V input; 2A output; 500kHz sync capability; no P-MOSFET drive; different pinout and compensation scheme. | Requires no external high-side switch; supports higher VIN; lacks 100% duty cycle; not drop-in replaceable due to topology and pin mismatch. | Choose TPS54202DRCT for simplified BOM and higher input voltage range, but expect layout redesign and re-compensation. |
Compared with LTC3801ES6#TRPBF, the LTC3801BES6#TRPBF trades 5–7% light-load efficiency for 4.6× lower output ripple and deterministic 550kHz operation; versus TPS54202DRCT, it offers superior dropout behavior and lower IQ but demands external P-MOSFET selection and gate drive design.
Availability
LTC3801BES6#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, wireless IoT endpoints, industrial handheld terminals, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.
Supply support for LTC3801BES6#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. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs, acquired Linear Technology in 2017 to expand its precision power and signal chain portfolio.
The LTC3801BES6#TRPBF belongs to ADI's legacy Linear Technology µPower DC/DC controller family, designed specifically for ultra-low-quiescent-current, high-efficiency step-down regulation in space-constrained, battery-critical applications.
FAQ
What is the primary functional difference between LTC3801BES6#TRPBF and LTC3801ES6#TRPBF?
The LTC3801BES6#TRPBF disables Burst Mode operation to maintain constant 550kHz switching and minimize output voltage ripple at light loads-measured at 17.6mVP-P at 100mA-whereas the LTC3801ES6#TRPBF enables Burst Mode for higher light-load efficiency (≥90% at 1mA) at the cost of increased low-frequency ripple (81.6mVP-P). Both share identical pinout, package, and core control architecture.
Does LTC3801BES6#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, LTC3801BES6#TRPBF supports true 100% duty cycle operation. When input voltage approaches the output voltage, the controller holds PGATE high continuously, allowing the external P-channel MOSFET to conduct DC current. This maintains regulation down to VIN ≈ VOUT + VDS(ON) + IOUT·RSENSE, extending usable battery life in Li-ion applications.
What is the recommended minimum external sense resistor value for LTC3801BES6#TRPBF at 2A output?
For 2A output with typical 40% inductor ripple current (0.8AP-P), the LTC3801BES6#TRPBF's 104mV peak current sense threshold requires RSENSE ≤ 104mV / (2A + 0.4A) = 43.3mΩ. A standard 40mΩ, 1% tolerance, 0805 chip resistor meets this requirement while providing margin for temperature drift and layout parasitics.
Can LTC3801BES6#TRPBF be used with an N-channel MOSFET instead of a P-channel MOSFET?
No, LTC3801BES6#TRPBF is designed exclusively for external P-channel high-side switch configuration. Its PGATE pin drives from 0V to VIN, which is appropriate for P-MOSFET gate control. Using an N-MOSFET would require bootstrap or charge-pump circuitry not supported by this controller's architecture or pinout.
What is the maximum allowable output voltage accuracy deviation over temperature for LTC3801BES6#TRPBF?
The LTC3801BES6#TRPBF guarantees ±1.5% output voltage accuracy over the full –40°C to +85°C operating temperature range, based on its 0.800V internal reference with ±1.5% tolerance. This specification includes initial accuracy, line regulation (0.05mV/V), and load regulation (2mV/µA), ensuring stable regulation across environmental and load variations.
LTC3801BES6#TRPBF 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#TRPBF FAQ
1.How can I place an order for LTC3801BES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3801BES6#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 LTC3801BES6#TRPBF reliable?
The price and inventory of LTC3801BES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3801BES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3801BES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3801BES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3801BES6#TRPBF?
LTC3801BES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3801BES6#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 LTC3801BES6#TRPBF?
For technical support, including LTC3801BES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3801BES6#TRPBF requirements.
6.How does Aetrix verify that LTC3801BES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3801BES6#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 LTC3801BES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3801BES6#TRPBF?
All LTC3801BES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3801BES6#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 LTC3801BES6#TRPBF part is unused and in its original packaging.
Return procedure for LTC3801BES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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