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Analog Devices Inc. LTC3405AES6-1.375#TRPBF
- Part No.:
- LTC3405AES6-1.375#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3405AES6-1.375#TRPBF.pdf
- Description:
- IC REG BCK 1.375V 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,288
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Product details
Overview
LTC3405AES6-1.375 from Analog Devices (formerly Linear Technology) is a high-efficiency, constant-frequency, current-mode synchronous step-down DC/DC regulator delivering 1.375V at up to 300mA output current. It operates from 2.5V to 5.5V input, features 1.5MHz switching, 20µA quiescent current in Burst Mode, and integrates both P-channel and N-channel MOSFETs - eliminating the need for an external Schottky diode. It is optimized for single Li-ion battery-powered portable electronics requiring low dropout and ceramic-capacitor stability.
For engineers reviewing the LTC3405AES6-1.375 datasheet, LTC3405AES6-1.375 pinout, LTC3405AES6-1.375 application, or LTC3405AES6-1.375 equivalent, key selection criteria include its ±3% output voltage accuracy, 100% duty-cycle capability for ultra-low dropout, RDS(ON) of 0.7Ω (P-FET) and 0.6Ω (N-FET), thermal shutdown protection, and ThinSOT-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC3405AES6-1.375 employs a patented current-mode architecture with internal slope compensation that maintains peak inductor current across all duty cycles - unlike conventional designs where slope compensation reduces peak current above 40% duty. Its dual-MOSFET synchronous rectification enables >90% efficiency at full load while supporting Burst Mode operation for sub-1mA quiescent current under light loads.
Control logic includes dedicated RUN and MODE pins: RUN enables/disables the regulator (threshold 0.3V–1.5V), while MODE selects between Burst Mode (MODE = GND) and pulse-skipping PWM (MODE = VIN). Overvoltage lockout triggers at +5.6% VOUT, and oscillator frequency foldback to ~210kHz occurs during short-circuit conditions to limit inductor current runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.375V ±3% - eliminates external feedback resistors and ensures stable core voltage for low-power microcontrollers and RF ICs. |
| Max Output Current | 300mA continuous - sufficient to power baseband processors, audio codecs, or sensor hubs in handheld devices. |
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion (2.7–4.2V), USB-powered (4.5–5.5V), and wide-input industrial rails. |
| Switching Frequency | 1.5MHz (typ.) - enables use of compact 2.2–4.7µH inductors and reduces EMI fundamental frequency above AM band. |
| Quiescent Current | 20µA in Burst Mode - extends battery runtime in standby/sleep states without sacrificing transient response. |
| Duty Cycle Range | 0% to 100% - allows dropout operation down to VIN = VOUT + ILOAD × RDS(ON), critical for end-of-battery-life operation. |
| Thermal Protection | Overtemperature shutdown at ~150°C - disables both switches and forces SW node into high-impedance state to prevent thermal runaway. |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant. Pin 1 marked with dot; exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable control input | Logic-high (>1.5V) enables regulation; <0.3V forces shutdown (<1µA IQ). Must not be left floating. |
| GND (Pin 2) | Power and signal reference | Primary ground return for internal switches, error amplifier, and oscillator - requires low-inductance connection to power plane. |
| SW (Pin 3) | Switch node | Drain connection of internal P-FET and N-FET; carries high di/dt square wave - must be routed with minimal loop area. |
| VIN (Pin 4) | Main input supply | Connects to input capacitor (≥2.2µF ceramic); supplies gate drive and bias current - decoupling must be placed adjacent to this pin. |
| VOUT (Pin 5) | Feedback reference | Internal 0.9V reference compares against resistor-divided VOUT; fixed-output version ties internal divider to yield 1.375V. |
| MODE (Pin 6) | Operating mode select | GND = Burst Mode (high efficiency at light load); VIN = pulse-skipping mode (lower ripple, better audio performance). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P- and N-channel MOSFETs eliminate external Schottky diode, reducing BOM count and improving efficiency by 5–10% at medium loads. |
| Ceramic-capacitor stability | No ESR dependency in control loop - enables use of low-ESR, small-footprint X5R/X7R ceramics for <10mV output ripple and minimal board area. |
| Burst Mode operation | Reduces IQ to 20µA at light loads while maintaining fast wake-up (<10µs) and tight output regulation - ideal for intermittent-sensing applications. |
| 100% duty cycle capability | Enables dropout operation down to VIN ≈ VOUT, extending usable battery voltage range by ~150mV in Li-ion systems. |
| Overvoltage lockout | Triggers at +5.6% VOUT (±3% tolerance), clamping output and protecting downstream 1.375V logic or analog circuitry from transient overvoltage events. |
Applications
| Cellular Telephones | Digital Still Cameras |
|---|---|
Use Scenario: Powering baseband processor core voltage in GSM/UMTS handsets operating from single Li-ion cell (2.7–4.2V). IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 1.375V at up to 300mA with dynamic load response to burst-mode transmission. Use Value: 90% peak efficiency and 20µA Burst Mode IQ directly extend talk time and standby duration without compromising RF performance. | Use Scenario: Supplying image sensor interface and ISP core voltage during capture bursts and preview modes. IC Role / Device Role / Timing Role: Low-noise, fast-transient DC/DC converter enabling clean 1.375V rail for CMOS image sensors and embedded vision processors. Use Value: Pulse-skipping mode (selected via MODE pin) suppresses switching noise near analog sensor paths, reducing image artifacts. |
| Wireless Modems | Portable Instruments |
Use Scenario: Providing stable 1.375V supply to Wi-Fi/BT SoC in battery-powered IoT gateways and hotspots. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting deep-sleep (Burst Mode) and active data-transfer (PWM) states with seamless transition. Use Value: Dual-mode operation ensures <1µA shutdown current and <20µA light-load IQ, meeting stringent energy-harvesting and long-life battery requirements. | Use Scenario: Powering precision ADC/DAC and microcontroller cores in handheld multimeters and environmental sensors. IC Role / Device Role / Timing Role: Low-drift, thermally robust DC/DC converter delivering accurate 1.375V reference-compatible rail with ±3% initial accuracy and <0.4%/V line regulation. Use Value: Tight output tolerance and low thermal drift minimize calibration drift across –40°C to 85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3405A-1.375#TRMPBF | Same electrical specs and pinout; differs only in tape-and-reel packaging (7-inch vs 13-inch reel) and moisture sensitivity level (MSL 1 vs MSL 3). | Identical functional behavior; suitable for same PCB layout and firmware - no design changes required. | Select #TRMPBF for high-volume automated assembly where smaller reels reduce feeder change frequency. |
| LTC3405AES6-1.5#TRPBF | Fixed 1.5V output (vs 1.375V); otherwise identical architecture, package, and performance envelope (300mA, 1.5MHz, 20µA IQ). | Requires redesign of downstream logic voltage domains if 1.375V is mandated by ASIC or FPGA core requirements. | Choose only when system-level voltage margin allows 1.5V - avoids external resistor dividers but may impact timing margins. |
Compared with LTC3405AES6-1.375#TRPBF, the #TRMPBF variant offers identical electrical and thermal performance with optimized packaging logistics, while the 1.5V version trades output voltage precision for broader compatibility with standard 1.5V logic families - neither is pin-compatible drop-in replacement without verifying voltage tolerance of load ICs.
Availability
LTC3405AES6-1.375 is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, and portable instruments requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3405AES6-1.375 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 support, datasheet documentation, and application engineering resources for legacy Linear regulators.
The LTC3405A family was designed specifically for space-constrained, battery-powered portable electronics demanding high efficiency across wide load ranges - emphasizing low quiescent current, ceramic-capacitor compatibility, and integrated power switches.
FAQ
What is the maximum recommended output current for the LTC3405AES6-1.375 under continuous operation?
The LTC3405AES6-1.375 is rated for 300mA continuous output current at TA = 25°C with adequate PCB copper area. At elevated ambient temperatures or with limited thermal relief, derating is required - e.g., ~220mA at 70°C ambient using the S6 package's θJA = 250°C/W. The device includes overtemperature protection that disables switching if junction temperature exceeds ~150°C.
Can the LTC3405AES6-1.375 operate with input voltages below 2.5V?
No - the absolute minimum input voltage for functional operation is 2.5V per the Electrical Characteristics table. Operation below this violates the specified input range and may result in unstable regulation, failure to start, or undefined behavior. The device will not regulate properly at 2.4V even with light loads, and the 100% duty cycle feature only applies within the 2.5–5.5V valid range.
Does the LTC3405AES6-1.375 require an external Schottky diode?
No. The LTC3405AES6-1.375 integrates both a P-channel main switch and an N-channel synchronous rectifier, eliminating the need for any external diode. This internal synchronous rectification improves efficiency by 5–10% compared to diode-based buck converters and reduces thermal stress on the PCB.
How does Burst Mode operation affect output voltage ripple on the LTC3405AES6-1.375?
In Burst Mode, the LTC3405AES6-1.375 delivers energy in short high-frequency bursts followed by sleep intervals, causing higher peak-to-peak output ripple (typically 20–50mV) compared to pulse-skipping mode (<10mV). However, ripple frequency drops to ~1–10kHz - easily filtered with small LC networks if needed for sensitive analog circuits.
What is the purpose of the MODE pin on the LTC3405AES6-1.375, and how should it be configured?
The MODE pin selects between two operating modes: grounding MODE enables Burst Mode (20µA IQ, higher ripple); connecting MODE to VIN enables pulse-skipping mode (higher light-load IQ, lower ripple, better EMI profile). Leaving MODE floating is prohibited - it must be actively pulled to GND or VIN with ≤10kΩ resistance to ensure deterministic behavior.
LTC3405AES6-1.375#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
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.375V
- Voltage - Output (Max):
- -
- Current - Output:
- 300mA
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC3405AES6-1.375#TRPBF FAQ
1.How can I place an order for LTC3405AES6-1.375#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3405AES6-1.375#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 LTC3405AES6-1.375#TRPBF reliable?
The price and inventory of LTC3405AES6-1.375#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3405AES6-1.375#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3405AES6-1.375#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3405AES6-1.375#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3405AES6-1.375#TRPBF?
LTC3405AES6-1.375#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3405AES6-1.375#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 LTC3405AES6-1.375#TRPBF?
For technical support, including LTC3405AES6-1.375#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3405AES6-1.375#TRPBF requirements.
6.How does Aetrix verify that LTC3405AES6-1.375#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3405AES6-1.375#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 LTC3405AES6-1.375#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3405AES6-1.375#TRPBF?
All LTC3405AES6-1.375#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3405AES6-1.375#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 LTC3405AES6-1.375#TRPBF part is unused and in its original packaging.
Return procedure for LTC3405AES6-1.375#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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