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Analog Devices Inc. LTC3405AES6-1.8#TRM
- Part No.:
- LTC3405AES6-1.8#TRM
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3405AES6-1.8#TRM.pdf
- Description:
- IC REG BUCK 1.8V 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,652
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Product details
Overview
LTC3405AES6-1.8#TRM from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator optimized for single Li-Ion battery-powered systems. It delivers up to 300mA output current at 1.8V with 93% peak efficiency, 20µA operating quiescent current, and operates across a 2.5V–5.5V input range. Its 1.5MHz fixed switching frequency enables compact designs using small ceramic capacitors and low-profile inductors.
For engineers reviewing the LTC3405AES6-1.8#TRM datasheet, LTC3405AES6-1.8#TRM pinout, LTC3405AES6-1.8#TRM application, or LTC3405AES6-1.8#TRM equivalent, key selection criteria include its Burst Mode™ operation for ultra-low-light-load efficiency, 100% duty cycle capability for low-dropout operation, ±3% output voltage accuracy, and compatibility with ceramic output capacitors without external compensation.
Technical Context
The LTC3405AES6-1.8#TRM employs a constant-frequency, 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 VFB to a 1.2V reference, enabling fast line and load transient response. Slope compensation prevents subharmonic oscillation above 40% duty cycle while preserving full peak current capability across all operating conditions.
Burst Mode™ operation-enabled by grounding the MODE pin-reduces quiescent current to 20µA by intermittently activating the power stage based on output voltage droop. Pulse-skipping mode (MODE tied to VIN) provides lower output ripple and reduced EMI at moderate-to-heavy loads, with oscillator frequency foldback during short-circuit events to limit inductor current runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% - eliminates external feedback resistors and ensures stable regulation across temperature and load. |
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-Ion (2.7V–4.2V), Li-Polymer, and regulated 3.3V/5V rails. |
| Max Output Current | 300mA at VIN ≥ 3V - sufficient for core logic, RF transceivers, and low-power microcontrollers in portable devices. |
| Switching Frequency | 1.5MHz (typ.) - enables use of ≤4.7µH inductors and 4.7µF ceramic capacitors, minimizing PCB footprint. |
| Quiescent Current | 20µA in Burst Mode - extends battery runtime in standby/sleep states without compromising wake-up performance. |
| Duty Cycle Range | 0% to 100% - supports dropout operation down to VIN = VOUT, critical for end-of-discharge battery operation. |
| Shutdown Current | <1µA - ensures negligible battery drain when system is fully powered off. |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant. Pin 1 marked with dot; pin 1 is RUN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable control input | High (>1.5V) enables regulator; low (<0.3V) forces shutdown with <1µA supply current. Must not float. |
| GND (Pin 2) | Power and signal reference | Primary ground return for IC core, power switches, and feedback circuitry; requires low-impedance PCB connection. |
| SW (Pin 3) | Switch node | Connection point for external inductor; carries high di/dt square-wave current from internal P- and N-channel MOSFETs. |
| VIN (Pin 4) | Main input supply | Input power rail (2.5V–5.5V); must be decoupled with ≥2.2µF ceramic capacitor placed adjacent to this pin. |
| VOUT (Pin 5) | Regulated output | 1.8V output node; connects to output capacitor and load; internal resistive divider sets feedback ratio. |
| MODE (Pin 6) | Operating mode select | Ground = Burst Mode™ (ultra-low IQ); tie to VIN = pulse-skipping mode (lower ripple, higher light-load IQ). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates need for external Schottky diode, increasing efficiency by ~5–10% and reducing thermal stress. |
| Ceramic-capacitor stability | No ESR dependency in control loop - enables use of low-ESR, high-RMS-current X5R/X7R ceramics for minimal output ripple and board area. |
| Overtemperature protection | Thermal shutdown activates at ~150°C junction temperature, disabling both switches and forcing SW into high-impedance state. |
| Low dropout operation | 100% duty cycle allows VIN as low as 1.8V while maintaining regulation - maximizes usable battery capacity. |
| Short-circuit frequency foldback | Oscillator reduces to ~210kHz under output short, limiting peak inductor current and preventing thermal runaway. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor and RF front-end in GSM/UMTS handsets operating from single Li-Ion cell. IC Role / Device Role / Timing Role: Primary 1.8V core supply regulator delivering up to 300mA with Burst Mode™ for extended standby time. Use Value: 93% peak efficiency and 20µA quiescent current directly extend talk and standby battery life without requiring complex power sequencing. | Use Scenario: Supplying 1.8V logic and transceiver circuits in 802.11b/g/n Wi-Fi or LTE Cat-M modems. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter interfacing between battery and digital baseband ICs. Use Value: 1.5MHz switching frequency enables <2mm² total solution size with 4.7µH inductor and 4.7µF ceramic capacitors - critical for space-constrained M.2 and mini-PCIe modules. |
| Digital Still Cameras | Portable Instruments |
Use Scenario: Providing clean 1.8V supply to image sensor interface and DSP in compact digital cameras. IC Role / Device Role / Timing Role: Low-noise, fast-transient-response regulator supporting burst-mode imaging and rapid wake-from-sleep. Use Value: Pulse-skipping mode (selected via MODE pin) minimizes output voltage ripple during active capture, preventing sensor noise coupling. | Use Scenario: Powering microcontroller, ADC, and display driver in handheld test equipment and medical monitors. IC Role / Device Role / Timing Role: Single-chip 1.8V regulator replacing discrete buck + LDO solutions in battery-operated instruments. Use Value: 2.5V–5.5V input range accommodates aging alkaline or NiMH batteries while maintaining regulation - improving field reliability and calibration stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | Fixed 1.8V output, 1.8MHz switching, 350mA IOUT, 17µA IQ in DCS-Control™ mode | Higher switching frequency enables smaller inductors but requires tighter layout for EMI control; no MODE pin for manual mode selection | Select when higher frequency and tighter output voltage tolerance (±1%) are prioritized over pin-level mode control flexibility. |
| MAX17222ETA+T | 1.8V fixed, 1.2MHz, 300mA, 1.3µA shutdown current, integrated soft-start | Lower shutdown current and built-in soft-start simplify design; lacks Burst Mode™ and uses different control architecture (hysteretic) | Select for ultra-low-power always-on subsystems where 1.3µA shutdown is critical and Burst Mode™ efficiency trade-offs are acceptable. |
Compared with TPS62231DRVR and MAX17222ETA+T, the LTC3405AES6-1.8#TRM offers unique user-selectable Burst Mode™/pulse-skipping operation via the MODE pin, 100% duty cycle for lowest possible dropout, and proven ceramic-capacitor stability without external compensation - making it optimal for cost-sensitive, battery-life-critical portable designs requiring design flexibility.
Availability
LTC3405AES6-1.8#TRM is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3405AES6-1.8#TRM 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 leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3405AES6-1.8#TRM belongs to the LTC®3405A family of high-efficiency, low-quiescent-current synchronous buck regulators designed specifically for space- and battery-constrained portable electronics operating from single-cell Li-Ion or Li-Polymer batteries.
FAQ
What is the maximum continuous output current of the LTC3405AES6-1.8#TRM?
The LTC3405AES6-1.8#TRM delivers up to 300mA continuous output current when VIN ≥ 3V and ambient temperature is within –40°C to 85°C. At lower input voltages (e.g., VIN = 2.7V), maximum output current drops to approximately 220mA due to increased conduction losses and thermal limits, as shown in Figure 2 of the datasheet.
Does the LTC3405AES6-1.8#TRM require an external Schottky diode?
No, the LTC3405AES6-1.8#TRM does not require an external Schottky diode. It integrates both a P-channel main switch and an N-channel synchronous rectifier, eliminating conduction losses and heat generation associated with external diodes - a key factor in achieving 93% peak efficiency.
How do I configure the LTC3405AES6-1.8#TRM for lowest quiescent current in standby mode?
To achieve the lowest quiescent current (20µA), connect the MODE pin (Pin 6) to GND to enable Burst Mode™ operation. This configuration causes the LTC3405AES6-1.8#TRM to operate intermittently, powering only when output voltage droop exceeds the sleep threshold - ideal for battery-powered standby applications.
Can the LTC3405AES6-1.8#TRM operate with ceramic output capacitors only?
Yes, the LTC3405AES6-1.8#TRM is explicitly designed for stable operation with ceramic output capacitors. Its current-mode control loop does not rely on capacitor ESR for compensation, allowing use of low-ESR X5R/X7R ceramics - resulting in low output ripple, small footprint, and improved reliability versus tantalum or electrolytic alternatives.
What package type and dimensions does the LTC3405AES6-1.8#TRM use?
The LTC3405AES6-1.8#TRM is housed in a 6-lead TSOT-23 (ThinSOT™) package measuring 2.90mm × 1.60mm × 1.00mm max height. It complies with JEDEC MO-193 and features a 1mm profile - optimized for ultra-thin portable electronics where board space and z-height are constrained.
LTC3405AES6-1.8#TRM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Cut Tape (CT)
- 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):
- 1.8V
- 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
LTC3405AES6-1.8#TRM FAQ
1.How can I place an order for LTC3405AES6-1.8#TRM through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3405AES6-1.8#TRM 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 LTC3405AES6-1.8#TRM reliable?
The price and inventory of LTC3405AES6-1.8#TRM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3405AES6-1.8#TRM is usually 5 days.
3.What payment methods are accepted for LTC3405AES6-1.8#TRM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3405AES6-1.8#TRM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3405AES6-1.8#TRM?
LTC3405AES6-1.8#TRM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3405AES6-1.8#TRM 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 LTC3405AES6-1.8#TRM?
For technical support, including LTC3405AES6-1.8#TRM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3405AES6-1.8#TRM requirements.
6.How does Aetrix verify that LTC3405AES6-1.8#TRM is sourced from the original manufacturer or authorized distributors?
All LTC3405AES6-1.8#TRM 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 LTC3405AES6-1.8#TRM meets industry standards.
7.What is the process for return or replacement of LTC3405AES6-1.8#TRM?
All LTC3405AES6-1.8#TRM units undergo pre-shipment inspection (PSI). If there is an issue with LTC3405AES6-1.8#TRM, 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 LTC3405AES6-1.8#TRM part is unused and in its original packaging.
Return procedure for LTC3405AES6-1.8#TRM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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