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Analog Devices Inc. LTC3405AES6-1.8#TRMPBF
- Part No.:
- LTC3405AES6-1.8#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3405AES6-1.8#TRMPBF.pdf
- Description:
- IC REG BUCK 1.8V 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:396
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Product details
Overview
LTC3405AES6-1.8#TRMPBF 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 2.5V–5.5V input range - enabling extended runtime in portable instrumentation and wireless modems.
For engineers reviewing the LTC3405AES6-1.8#TRMPBF datasheet, LTC3405AES6-1.8#TRMPBF pinout, LTC3405AES6-1.8#TRMPBF application, or LTC3405AES6-1.8#TRMPBF equivalent, key selection criteria include its fixed 1.8V output, 1.5MHz constant-frequency current-mode control, ceramic-capacitor compatibility, and ThinSOT-6 package footprint for space-constrained designs.
Technical Context
The LTC3405AES6-1.8#TRMPBF employs a constant-frequency, current-mode architecture with internal P-channel main and N-channel synchronous switches. Its 1.5MHz oscillator enables compact external components, while slope compensation ensures stability at high duty cycles without reducing peak inductor current capability.
Burst Mode operation (enabled by grounding MODE pin) reduces quiescent current to 20µA under light loads, whereas Pulse Skipping Mode (MODE tied to VIN) maintains lower output ripple above 25mA. Overtemperature protection shuts down both switches if junction temperature exceeds ~150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% - eliminates external feedback resistors and simplifies layout for stable low-noise supply rails. |
| Input Voltage Range | 2.5V to 5.5V - supports full discharge curve of single Li-ion (2.7V–4.2V) and compatibility with 3.3V/5V system rails. |
| Max Output Current | 300mA at VIN ≥ 3V - sufficient for baseband processors, RF front-ends, and sensor interfaces in portable devices. |
| Switching Frequency | 1.5MHz (typ), 170kHz in overcurrent foldback - enables use of ≤4.7µH inductors and <10µF ceramic output capacitors. |
| Quiescent Current | 20µA in Burst Mode - extends battery life during standby in cellular handsets and digital cameras. |
| Shutdown Current | <1µA - allows complete system power gating without leakage concerns in always-on applications. |
| Efficiency Peak | 93% at 300mA, VIN=3.6V - minimizes thermal stress and improves power density in thermally constrained enclosures. |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm height, JEDEC MO-193 compliant. Pin pitch: 0.95mm; body dimensions: 2.90mm × 1.60mm × 1.00mm max.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable control input | Logic-high (>1.5V) enables regulation; logic-low (<0.3V) forces shutdown with <1µA supply draw - requires pull-up/pull-down, not floating. |
| GND (Pin 2) | Power and signal reference | Primary return path for input/output currents and internal control circuitry - must be low-impedance connection to PCB ground plane. |
| SW (Pin 3) | Switch node | Connects to inductor and drains of internal P- and N-channel MOSFETs - carries high di/dt square-wave current; requires short, wide trace routing. |
| VIN (Pin 4) | Main power input | Supplies internal circuitry and switch drivers - requires local 2.2µF+ ceramic decoupling capacitor placed adjacent to pin. |
| VOUT (Pin 5) | Regulated output feedback | Internally divided 1.8V output connected to error amplifier - no external resistor network needed; sensitive to noise coupling. |
| MODE (Pin 6) | Operating mode select | Ground = Burst Mode (low IQ); tie to VIN = Pulse Skipping Mode (lower ripple) - determines light-load efficiency vs EMI trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - reduces conduction loss and board area; enables 100% duty cycle for ultra-low dropout operation. |
| Ceramic capacitor stability | No ESR dependency for loop stability - permits use of low-ESR, high-ripple-current X5R/X7R ceramics for minimal output ripple and small PCB footprint. |
| Low dropout operation | 100% duty cycle capability - sustains regulation down to VIN ≈ VOUT + 0.1V, critical for end-of-battery-life operation in Li-ion systems. |
| Overtemperature protection | Thermal shutdown at ~150°C junction temperature - prevents damage during overload or poor heatsinking; auto-recovery on cooldown. |
| Current-mode control | Fast line/load transient response with inherent cycle-by-cycle current limiting - improves reliability under dynamic load steps in processor cores and RF ICs. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor core voltage rail in GSM/UMTS handsets operating from single Li-ion cell (2.7V–4.2V). IC Role / Device Role / Timing Role: Primary 1.8V synchronous buck regulator delivering up to 300mA with Burst Mode for standby efficiency. Use Value: Extends talk time by maintaining >90% efficiency across 1mA–300mA load range and enabling deep-sleep current below 1µA. | Use Scenario: Supplying 1.8V logic and RF interface circuits in 802.11b/g/n Wi-Fi or LTE CAT-M modules. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter with 1.5MHz switching to avoid interference with 2.4GHz ISM band. Use Value: Enables compact design using 4.7µH inductor and 4.7µF ceramic capacitors - reduces BOM count and PCB area by 40% vs. asynchronous alternatives. |
| Digital Still Cameras | Portable Instruments |
Use Scenario: Providing clean 1.8V supply to image sensor interface and memory controller during burst capture mode. IC Role / Device Role / Timing Role: High-transient-response buck regulator handling rapid 0–250mA load steps with <20mV overshoot. Use Value: Maintains sensor timing integrity via fast load-step recovery (≤5µs) and low 10mVpp output ripple in Pulse Skipping Mode. | Use Scenario: Powering microcontroller, ADC, and display driver in handheld multimeters or gas detectors. IC Role / Device Role / Timing Role: Primary system regulator supporting wide input range (2.5V–5.5V) to accommodate alkaline, Li-ion, and USB power sources. Use Value: Ensures uninterrupted operation during battery swap or source transition via seamless dropout recovery and no brownout reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.8V output, 3MHz switching, 400mA rating, 17µA IQ - higher frequency enables smaller inductors but increases EMI sensitivity. | Requires tighter layout control for EMI; less suitable for audio-sensitive applications due to 3MHz fundamental. | Select when board space is critical and EMI filtering can be implemented; verify thermal performance at 400mA continuous load. |
| RT8059GJ6 | Fixed 1.8V output, 1.5MHz switching, 500mA rating, 25µA IQ - wider input range (2.3V–5.5V), but lacks Burst Mode and has higher light-load IQ. | No Burst Mode means higher standby current in battery-critical applications; better suited for USB-powered instruments. | Prefer for mixed-power-source systems requiring 2.3V start-up; avoid where sub-20µA quiescent current is mandatory. |
Compared with TPS62231DRYR and RT8059GJ6, the LTC3405AES6-1.8#TRMPBF offers superior light-load efficiency via Burst Mode and proven ceramic-capacitor stability, making it optimal for long-duration portable equipment where battery life and layout simplicity are prioritized over maximum current rating.
Availability
LTC3405AES6-1.8#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable instrumentation requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LTC3405AES6-1.8#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, Inc. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision, industrial, automotive, and communications markets.
The LTC3405A series was designed specifically for high-efficiency, low-quiescent-current DC/DC conversion in space- and battery-constrained portable electronics - emphasizing ceramic-capacitor compatibility, thin packaging, and robust light-load operation.
FAQ
What is the absolute maximum input voltage rating for the LTC3405AES6-1.8#TRMPBF?
The LTC3405AES6-1.8#TRMPBF has an absolute maximum input voltage rating of 6V. Exceeding this value - even momentarily - risks permanent damage to the internal P-channel MOSFET and control circuitry. Recommended operating range remains 2.5V to 5.5V per datasheet specifications, with derated performance below 2.5V.
Does the LTC3405AES6-1.8#TRMPBF require an external Schottky diode?
No, the LTC3405AES6-1.8#TRMPBF does not require an external Schottky diode. Its integrated synchronous rectification uses internal N-channel MOSFETs to replace the diode, eliminating forward-voltage drop losses and improving efficiency - especially at low output voltages like 1.8V.
How does the MODE pin affect efficiency and output ripple in the LTC3405AES6-1.8#TRMPBF?
When MODE is grounded, the LTC3405AES6-1.8#TRMPBF enters Burst Mode, achieving 20µA quiescent current but introducing low-frequency output ripple. When MODE is tied to VIN, it operates in Pulse Skipping Mode - increasing light-load IQ to ~35µA but reducing ripple amplitude and EMI, making it preferable for noise-sensitive analog sections.
Can the LTC3405AES6-1.8#TRMPBF operate with 100% duty cycle, and what is its significance?
Yes, the LTC3405AES6-1.8#TRMPBF supports 100% duty cycle operation, allowing VOUT to remain regulated even when VIN drops to within ~100mV of the 1.8V output. This feature maximizes usable battery capacity in single-cell Li-ion systems, extending operational time before brownout occurs.
What is the thermal resistance (θJA) of the LTC3405AES6-1.8#TRMPBF in its TSOT-23 package?
The LTC3405AES6-1.8#TRMPBF in the S6 (TSOT-23) package has a junction-to-ambient thermal resistance (θJA) of 250°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard PCB layout with minimal copper; actual θJA improves significantly with added thermal vias and copper pour under the exposed pad (if present) or GND pin connections.
LTC3405AES6-1.8#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):
- 1.8V
- 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#TRMPBF FAQ
1.How can I place an order for LTC3405AES6-1.8#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3405AES6-1.8#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 LTC3405AES6-1.8#TRMPBF reliable?
The price and inventory of LTC3405AES6-1.8#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3405AES6-1.8#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3405AES6-1.8#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3405AES6-1.8#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3405AES6-1.8#TRMPBF?
LTC3405AES6-1.8#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3405AES6-1.8#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 LTC3405AES6-1.8#TRMPBF?
For technical support, including LTC3405AES6-1.8#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3405AES6-1.8#TRMPBF requirements.
6.How does Aetrix verify that LTC3405AES6-1.8#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3405AES6-1.8#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 LTC3405AES6-1.8#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3405AES6-1.8#TRMPBF?
All LTC3405AES6-1.8#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3405AES6-1.8#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 LTC3405AES6-1.8#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3405AES6-1.8#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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