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Analog Devices Inc. LTC3405AES6-1.5#TRMPBF
- Part No.:
- LTC3405AES6-1.5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3405AES6-1.5#TRMPBF.pdf
- Description:
- IC REG BUCK 1.5V 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LTC3405AES6-1.5#TRMPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter optimized for single Li-Ion battery-powered systems. It delivers up to 300mA output current at 1.5V with 93% peak efficiency, 20µA operating quiescent current, and 1.5MHz fixed switching frequency - enabling compact designs using small ceramic capacitors and ≤4.7µH inductors.
For engineers reviewing the LTC3405AES6-1.5#TRMPBF datasheet, LTC3405AES6-1.5#TRMPBF pinout, LTC3405AES6-1.5#TRMPBF application, or LTC3405AES6-1.5#TRMPBF equivalent, key selection criteria include its 2.5V–5.5V input range, ±3% output voltage accuracy, Burst Mode™ operation for ultra-low IQ, 100% duty cycle low-dropout capability, and TSOT-23-6 package compatibility with space-constrained portable electronics.
Technical Context
The LTC3405AES6-1.5#TRMPBF employs a constant-frequency, current-mode control architecture with integrated P-channel main and N-channel synchronous switches. Its internal 1.2V reference and error amplifier regulate output via a fixed-resistor feedback network (R1=110kΩ, R2=440kΩ), enabling stable 1.5V output without external components.
Burst Mode™ operation (enabled by grounding MODE pin) reduces quiescent current to 20µA at light loads, while pulse-skipping mode (MODE tied to VIN) maintains lower output ripple above 25mA. Overtemperature protection disables both switches at ~150°C, and overvoltage lockout triggers at +7.8% VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±3% - eliminates need for external feedback resistors and ensures precision regulation across temperature and load. |
| Input Voltage Range | 2.5V to 5.5V - supports full discharge curve of single Li-Ion (2.7V–4.2V) with margin for transient spikes. |
| Max Output Current | 300mA at VIN = 3V - sufficient for baseband processors, sensors, and RF front-ends in portable devices. |
| Switching Frequency | 1.5MHz (±20%) - enables use of sub-5µH inductors and <10µF ceramic output capacitors, minimizing PCB area. |
| Quiescent Current | 20µA in Burst Mode - extends battery runtime in standby/sleep states without compromising wake-up response. |
| Shutdown Current | <1µA - ensures zero-load battery drain during system power-off or deep sleep modes. |
| Efficiency Peak | 93% at 300mA, VIN = 3.6V - minimizes thermal stress and maximizes energy utilization in thermally constrained enclosures. |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, 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/Shutdown Control Input | Logic-high (>1.5V) enables regulation; logic-low (<0.3V) forces shutdown with <1µA supply current - requires pull-up or active control to prevent floating. |
| GND (Pin 2) | Power Ground Reference | Primary return path for input capacitor, inductor, and internal switch currents - must be low-impedance and directly connected to power plane. |
| SW (Pin 3) | Switch Node | Connection point between internal P- and N-channel MOSFET drains - carries high di/dt square-wave current; requires short, wide trace to minimize EMI and voltage spikes. |
| VIN (Pin 4) | Main Input Supply | Connects to input capacitor (≥2.2µF ceramic); supplies gate drive and bias current - decoupling must be placed within 2mm of this pin. |
| VOUT (Pin 5) | Regulated Output Feedback | Internally divided 1.5V output node - no external resistor required; connects directly to output capacitor and load - sensitive to noise coupling. |
| MODE (Pin 6) | Operating Mode Select | Ground = Burst Mode (20µA IQ); tie to VIN = Pulse-Skipping Mode (lower ripple >25mA) - floating state is undefined and must be avoided. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - improves efficiency by 5–10% and reduces thermal footprint vs. asynchronous buck converters. |
| Ceramic-capacitor stability | No ESR dependency in control loop - allows use of low-ESR X5R/X7R ceramics for <10mVP-P output ripple and minimal board area. |
| 100% duty cycle operation | Maintains regulation down to VIN ≈ VOUT - extends usable battery life in deep-discharge conditions (e.g., 2.7V → 1.5V). |
| Overvoltage lockout | Triggers at +7.8% VOUT - protects downstream 1.5V logic (e.g., ARM Cortex-M cores, LPDDR I/O) from transient overvoltage damage. |
| Thermal shutdown | Activates at ~150°C junction temperature - prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| Cellular Baseband Power | Digital Camera Sensor Bias |
|---|---|
|
Use Scenario: Powering ARM-based application processors and modem subsystems in LTE smartphones operating from single-cell Li-Ion batteries. IC Role / Device Role / Timing Role: Primary 1.5V core supply regulator delivering up to 300mA with fast load-transient response to handle CPU burst activity. Use Value: 93% efficiency at 300mA reduces heat generation in sealed handset enclosures; 20µA Burst Mode extends standby time beyond 7 days. |
Use Scenario: Providing clean, low-noise 1.5V bias to CMOS image sensor analog front-ends and ADC reference circuits. IC Role / Device Role / Timing Role: Low-ripple, low-noise DC/DC converter supplying critical analog rails where switching noise could degrade SNR or introduce fixed-pattern noise. Use Value: Pulse-skipping mode (selected via MODE pin) suppresses 1.5MHz switching artifacts near sensitive analog signal paths, maintaining >65dB PSRR. |
| Wireless Modem RF IC Supply | Portable Medical Sensor Node |
|
Use Scenario: Generating 1.5V supply for LTE/Wi-Fi transceiver ICs requiring tight voltage tolerance and rapid dynamic response during TX/RX transitions. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter supporting 0–300mA load steps with <50µs recovery time and <20mV undershoot. Use Value: 1.5MHz switching frequency avoids interference with 2.4GHz ISM band; ±3% output accuracy ensures RF IC compliance with supply spec limits. |
Use Scenario: Powering ultra-low-power microcontrollers and biosignal amplifiers in wearable ECG/PPG patches powered by coin-cell or thin-film Li-Ion batteries. IC Role / Device Role / Timing Role: Long-duration, low-quiescent-current regulator enabling multi-week operation on 100mAh batteries with intermittent sensing bursts. Use Value: <1µA shutdown current preserves battery charge during storage; 20µA Burst Mode enables 3+ months of continuous monitoring at 1Hz sampling. |
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 | 1.5V fixed output, 300mA, 3MHz switching, 17µA IQ; smaller 2mm × 2mm WSON package but requires external soft-start capacitor. | Better suited for higher-frequency, ultra-compact layouts where 3MHz allows sub-2.2µH inductors - less optimal for noise-sensitive analog rails due to higher fundamental frequency. | Select when board area is constrained below 4mm² and EMI filtering can accommodate 3MHz harmonics. |
| MAX17222ELT+T | 1.5V fixed output, 500mA, 1.5MHz, 2.5µA IQ in shutdown; integrates power-good flag but lacks MODE-selectable Burst/PWM modes. | Superior light-load efficiency and higher current headroom - ideal for systems adding future peripherals, but lacks programmable mode flexibility for ripple-sensitive designs. | Select when lowest possible shutdown current (<3µA) and 500mA headroom are mandatory, and fixed low-noise operation suffices. |
Compared with TPS62231DRVR and MAX17222ELT+T, the LTC3405AES6-1.5#TRMPBF uniquely balances ultra-low 20µA Burst Mode IQ, pin-strapped mode selection for ripple/noise trade-offs, and proven robustness in Li-Ion discharge profiles - making it optimal for cost-sensitive, thermally constrained portable designs requiring design flexibility.
Availability
LTC3405AES6-1.5#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, wireless modems, and portable medical instruments requiring stable component supply across extended production lifecycles.
Supply support for LTC3405AES6-1.5#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 its legacy of high-performance power management ICs for precision, portable, and industrial applications.
The LTC3405AES6-1.5#TRMPBF belongs to Linear's ThinSOT™ synchronous buck regulator family, engineered specifically for single-cell Li-Ion systems demanding high efficiency at light loads, minimal solution size, and reliable operation across full battery discharge curves.
FAQ
What is the maximum output current capability of the LTC3405AES6-1.5#TRMPBF under typical operating conditions?
The LTC3405AES6-1.5#TRMPBF delivers up to 300mA output current when VIN = 3V, as confirmed in the Electrical Characteristics table. At lower input voltages (e.g., 2.7V), maximum output current decreases per Figure 2; at higher inputs (e.g., 5.5V), thermal limits may constrain sustained 300mA delivery depending on PCB copper area and ambient temperature. The device's 630mA peak switch current rating supports transient loads beyond steady-state limits.
Does the LTC3405AES6-1.5#TRMPBF require external feedback resistors to set its 1.5V output?
No. The LTC3405AES6-1.5#TRMPBF is a fixed-output variant with internal resistor divider (R1=110kΩ, R2=440kΩ) referenced to a 1.2V bandgap - no external feedback components are needed. This simplifies layout, improves accuracy versus discrete resistor tolerances, and eliminates drift sources. The VOUT pin is the regulated output node itself, not a feedback sense point.
How does the MODE pin affect efficiency and output ripple in the LTC3405AES6-1.5#TRMPBF?
Grounding the MODE pin enables Burst Mode™ operation, reducing quiescent current to 20µA and maximizing light-load efficiency - but introduces low-frequency output voltage ripple (~kHz range). Tying MODE to VIN selects pulse-skipping mode, which maintains 1.5MHz switching and yields lower output ripple (<10mVP-P) above 25mA, at the cost of ~2× higher IQ. The choice directly impacts audio/RF circuit noise susceptibility.
Can the LTC3405AES6-1.5#TRMPBF operate with ceramic input and output capacitors only?
Yes. The LTC3405AES6-1.5#TRMPBF is explicitly designed for ceramic capacitor stability - its current-mode control loop does not rely on output capacitor ESR for compensation. Recommended values are ≥2.2µF X5R/X7R ceramics at VIN and ≥4.7µF at VOUT. Caution: Input ceramic caps require careful layout to avoid ringing when fed from long cables or unregulated adapters.
What thermal derating applies to the LTC3405AES6-1.5#TRMPBF in a standard 2-layer PCB layout?
With the TSOT-23-6 package (θJA = 250°C/W), the LTC3405AES6-1.5#TRMPBF reaches ~89.8°C junction temperature at 300mA, 2.7VIN, and 70°C ambient - well below the 125°C limit. In standard 2-layer boards without thermal vias or copper pours, sustained 300mA operation is viable up to ~60°C ambient. Adding two 10-mil thermal vias under GND pin reduces θJA by ~40°C/W, enabling full-rated current at higher temperatures.
LTC3405AES6-1.5#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):
- 1.5V
- 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
LTC3405AES6-1.5#TRMPBF FAQ
1.How can I place an order for LTC3405AES6-1.5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3405AES6-1.5#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 LTC3405AES6-1.5#TRMPBF reliable?
The price and inventory of LTC3405AES6-1.5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3405AES6-1.5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3405AES6-1.5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3405AES6-1.5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3405AES6-1.5#TRMPBF?
LTC3405AES6-1.5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3405AES6-1.5#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 LTC3405AES6-1.5#TRMPBF?
For technical support, including LTC3405AES6-1.5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3405AES6-1.5#TRMPBF requirements.
6.How does Aetrix verify that LTC3405AES6-1.5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3405AES6-1.5#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 LTC3405AES6-1.5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3405AES6-1.5#TRMPBF?
All LTC3405AES6-1.5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3405AES6-1.5#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 LTC3405AES6-1.5#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3405AES6-1.5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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