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Analog Devices Inc. LTC3405AES6-1.375#TRMPBF
- Part No.:
- LTC3405AES6-1.375#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3405AES6-1.375#TRMPBF.pdf
- Description:
- IC REG BCK 1.375V 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,720
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Product details
Overview
LTC3405AES6-1.375#TRMPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, constant-frequency, current-mode synchronous step-down DC/DC regulator in a 6-lead ThinSOT package. It delivers up to 300mA output current with 1.375V fixed output voltage, operates from 2.5V to 5.5V input, achieves up to 90% efficiency, and features 20µA quiescent current in Burst Mode operation - ideal for Li-ion battery-powered portable electronics requiring low-noise, compact power conversion.
For engineers reviewing the LTC3405AES6-1.375#TRMPBF datasheet, LTC3405AES6-1.375#TRMPBF pinout, LTC3405AES6-1.375#TRMPBF application, or LTC3405AES6-1.375#TRMPBF equivalent, key selection considerations include its 1.5MHz switching frequency enabling small external components, ±3% output voltage accuracy over temperature, 100% duty-cycle low-dropout capability, and dual-mode control (Burst Mode / Pulse Skipping) via MODE pin configuration.
Technical Context
The LTC3405AES6-1.375#TRMPBF implements a constant-frequency (1.5MHz nominal), current-mode control architecture with internal P-channel main and N-channel synchronous switches. Its peak inductor current is regulated by an error amplifier comparing VOUT feedback against a 0.9V internal reference, while slope compensation prevents subharmonic oscillation above 40% duty cycle - enhanced by a patented scheme preserving full peak current across all duty cycles.
Burst Mode operation reduces quiescent current to 20µA at light loads by intermittently enabling switching bursts, while Pulse Skipping Mode (MODE = VIN) maintains lower output ripple and better audio compatibility. Overtemperature protection disables both switches when junction temperature reaches ~150°C, and short-circuit foldback reduces oscillator frequency to ~210kHz to limit inductor current rise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.375V ±3% - eliminates external feedback resistors and ensures stable core logic supply for low-voltage microcontrollers. |
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion (2.7–4.2V), Li-polymer, and regulated 3.3V/5V rails without external LDO pre-regulation. |
| Max Output Current | 300mA continuous - sufficient for powering DSPs, RF transceivers, or sensor subsystems in handheld devices. |
| Switching Frequency | 1.5MHz (±20%) - enables use of ≤4.7µH inductors and 4.7µF ceramic capacitors, minimizing PCB area and cost. |
| Quiescent Current | 20µA in Burst Mode - extends battery runtime in standby/sleep states of cellular phones and digital cameras. |
| Shutdown Current | <1µA - ensures negligible drain during system off-state, critical for always-on monitoring functions. |
| RDS(ON) (P-FET/N-FET) | 0.85Ω / 0.90Ω at 100mA - minimizes conduction loss at medium load, supporting >85% efficiency at 100mA with 3.6V input. |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant. Pin 1 marked with dot; pin 1 is RUN, pin 2 is GND, pin 3 is SW, pin 4 is VIN, pin 5 is VOUT, pin 6 is MODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/disable control input | Logic-high (>1.5V) enables regulation; logic-low (<0.3V) forces shutdown with <1µA supply current - must not be left floating. |
| GND (Pin 2) | Power and signal reference ground | Common return path for VIN, VOUT, SW, and internal circuitry - requires low-impedance connection to PCB ground plane. |
| SW (Pin 3) | Internal switch node | Connects to drains of internal P-FET and N-FET - carries high di/dt square-wave current; must be routed with minimal loop area. |
| VIN (Pin 4) | Main input supply | Accepts 2.5–5.5V; requires ≥2.2µF ceramic decoupling capacitor placed adjacent to pin to suppress switching noise. |
| VOUT (Pin 5) | Regulated output voltage | Fixed 1.375V output; connects to output capacitor and load - internal resistive divider sets feedback ratio for 0.9V reference. |
| MODE (Pin 6) | Operating mode select | Ground = Burst Mode (low IQ); connect to VIN = Pulse Skipping Mode (lower ripple); floating prohibited. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates need for external Schottky diode - improves efficiency by 5–10% and reduces thermal stress vs. asynchronous designs. |
| Ceramic capacitor stability | Stable with zero-ESR ceramic output capacitors - enables <10mVpp output ripple and compact 0603/0805 footprint designs. |
| 100% duty-cycle operation | Supports dropout as low as VOUT − 100mV - extends usable battery life down to 1.475V input in Li-ion systems. |
| Overvoltage lockout | Triggers at +5.6% VOUT deviation - protects downstream 1.375V logic from transient overshoot during load dump or startup. |
| Thermal shutdown | Disables switching at ~150°C junction temperature - prevents permanent damage during sustained overload or poor heatsinking. |
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 stable 1.375V at up to 300mA with Burst Mode for ultra-low standby IQ. Use Value: Extends talk time by >15% vs. linear regulators and enables 100% duty-cycle operation to utilize full battery voltage range. | Use Scenario: Supplying image sensor and ISP core voltage during burst capture mode with rapid load transients. IC Role / Device Role / Timing Role: High-transient-response buck converter with 1.5MHz switching and current-mode control for fast line/load regulation. Use Value: Maintains <±1% VOUT deviation during 0–250mA load steps, preventing image artifacts or frame drops. |
| Wireless Modems | Portable Instruments |
Use Scenario: Providing clean 1.375V rail to Wi-Fi/BT SoC in USB-powered dongles or embedded modules. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source with Pulse Skipping Mode selected to minimize RF interference. Use Value: Achieves <20mVpp output ripple at 100mA, reducing conducted EMI into sensitive 2.4GHz RF front-end. | Use Scenario: Powering precision ADC/DAC and microcontroller in handheld test equipment with long battery life requirement. IC Role / Device Role / Timing Role: Highly accurate (±3%) fixed-output regulator with low thermal drift and shutdown control for power sequencing. Use Value: Ensures ADC reference stability within 0.5 LSB error over temperature and battery discharge, improving measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3405AES6-1.5#TRMPBF | Fixed 1.5V output; identical package, pinout, and electrical specs except VOUT and associated feedback divider. | Used where system requires 1.5V logic rail instead of 1.375V - e.g., certain FPGA I/O banks or legacy microcontrollers. | Select only if target voltage matches; no PCB change needed but verify load compatibility with higher VOUT. |
| LTC3406ES6#TRMPBF | Adjustable output (0.6V to VIN−0.3V); 600mA rated; same S6 package but different MODE/RUN thresholds and higher RDS(ON). | Preferred for multi-rail systems needing programmable outputs or higher current; requires external feedback resistors. | Choose when flexibility or >300mA is required; not drop-in - redesign feedback network and verify thermal performance. |
Compared with LTC3405AES6-1.375#TRMPBF, the LTC3405AES6-1.5#TRMPBF offers identical form-factor and efficiency but targets 1.5V loads, whereas the LTC3406ES6#TRMPBF trades fixed-voltage simplicity for adjustable output and doubled current capacity - requiring layout and BOM changes.
Availability
LTC3405AES6-1.375#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, and wireless modems requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LTC3405AES6-1.375#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 support, documentation, and manufacturing continuity for all Linear-branded power ICs.
The LTC3405A family was designed specifically for space-constrained, battery-powered portable electronics demanding high efficiency at light loads, low-profile packaging, and robust transient response - exemplified by the LTC3405AES6-1.375#TRMPBF's 1.375V fixed output and 1mm ThinSOT footprint.
FAQ
What is the maximum recommended output current for the LTC3405AES6-1.375#TRMPBF?
The LTC3405AES6-1.375#TRMPBF is rated for up to 300mA continuous output current under typical conditions (VIN = 3V, TA = 25°C). Derating is required at elevated ambient temperatures or higher input voltages due to thermal limits; at 85°C ambient with VIN = 5.5V, maximum sustainable current drops to ~220mA to maintain TJ < 125°C in the S6 package.
Does the LTC3405AES6-1.375#TRMPBF require an external Schottky diode?
No, the LTC3405AES6-1.375#TRMPBF integrates both P-channel main and N-channel synchronous switches, eliminating the need for an external Schottky diode. This improves efficiency by 5–10% and reduces component count, PCB area, and thermal dissipation compared to asynchronous buck converters.
How does the MODE pin affect operation of the LTC3405AES6-1.375#TRMPBF?
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 ripple but lower noise, better for RF/audio). Leaving MODE floating is prohibited and may cause erratic behavior or increased quiescent current.
What is the absolute maximum input voltage rating for the LTC3405AES6-1.375#TRMPBF?
The absolute maximum input voltage for the LTC3405AES6-1.375#TRMPBF is 6V, as specified in the Absolute Maximum Ratings table. Operation above 5.5V (recommended max) risks exceeding safe operating area limits, especially during transient events, and may trigger overvoltage lockout or cause permanent damage.
Can the LTC3405AES6-1.375#TRMPBF operate with 100% duty cycle, and what is its practical benefit?
Yes, the LTC3405AES6-1.375#TRMPBF supports 100% duty cycle operation, allowing VOUT to be maintained even when VIN approaches VOUT (e.g., VIN = 1.475V → VOUT = 1.375V). This maximizes usable battery energy in Li-ion systems, extending runtime by up to 12% compared to regulators requiring ≥300mV dropout.
LTC3405AES6-1.375#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
- 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#TRMPBF FAQ
1.How can I place an order for LTC3405AES6-1.375#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3405AES6-1.375#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 LTC3405AES6-1.375#TRMPBF reliable?
The price and inventory of LTC3405AES6-1.375#TRMPBF 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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3405AES6-1.375#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3405AES6-1.375#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3405AES6-1.375#TRMPBF?
LTC3405AES6-1.375#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3405AES6-1.375#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 LTC3405AES6-1.375#TRMPBF?
For technical support, including LTC3405AES6-1.375#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3405AES6-1.375#TRMPBF requirements.
6.How does Aetrix verify that LTC3405AES6-1.375#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3405AES6-1.375#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 LTC3405AES6-1.375#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3405AES6-1.375#TRMPBF?
All LTC3405AES6-1.375#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3405AES6-1.375#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 LTC3405AES6-1.375#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3405AES6-1.375#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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