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Analog Devices Inc. LTC3405AES6-1.5#TRPBF
- Part No.:
- LTC3405AES6-1.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3405AES6-1.5#TRPBF.pdf
- Description:
- IC REG BUCK 1.5V 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,045
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Product details
Overview
LTC3405AES6-1.5#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator delivering 1.5V at up to 300mA from a 2.5V–5.5V input, featuring 1.5MHz fixed-frequency current-mode control, 93% peak efficiency, and 20µA quiescent current during operation - optimized for single Li-Ion battery-powered portable electronics.
For engineers reviewing the LTC3405AES6-1.5#TRPBF datasheet, LTC3405AES6-1.5#TRPBF pinout, LTC3405AES6-1.5#TRPBF application, or LTC3405AES6-1.5#TRPBF equivalent, key selection criteria include its 1.5V fixed output, ThinSOT-6 package footprint, Burst Mode™ vs pulse-skipping mode configurability via MODE pin, and ceramic-capacitor compatibility without external Schottky diode.
Technical Context
The LTC3405AES6-1.5#TRPBF employs a constant-frequency current-mode architecture with internal P-channel main switch (RDS(ON) = 0.7Ω typ) and N-channel synchronous rectifier (RDS(ON) = 0.6Ω typ), enabling stable regulation across 2.5V–5.5V input while maintaining ±3% output voltage accuracy over temperature and load. Its 100% duty-cycle capability supports low-dropout operation down to VIN ≈ VOUT, extending runtime in battery-depleted conditions.
Burst Mode™ operation (enabled by grounding MODE pin) reduces quiescent current to 20µA at light loads, while pulse-skipping mode (MODE tied to VIN) delivers lower output ripple above 25mA. Overtemperature protection and output overvoltage lockout (ΔVOVL = 2.5–13%) ensure robust system-level reliability without external supervision circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±3% - eliminates external feedback resistors and ensures precise core logic supply for microcontrollers and sensors. |
| Max Output Current | 300mA at VIN ≥ 3V - sufficient for powering baseband processors, RF front-ends, or display drivers in compact handheld devices. |
| Input Voltage Range | 2.5V to 5.5V - fully covers single-cell Li-ion (2.7V–4.2V) and USB-powered (4.75V–5.25V) use cases without input stage derating. |
| Switching Frequency | 1.5MHz (±20%) - enables use of sub-5mm surface-mount inductors (e.g., 4.7µH) and minimizes EMI filtering requirements. |
| Quiescent Current | 20µA in Burst Mode - extends shelf life and standby time in always-on IoT sensors and wearables. |
| Shutdown Current | <1µA - allows complete system power gating without leakage concerns in battery-backed applications. |
| Package | TSOT-23-6 (ThinSOT™), 1mm height - provides thermal performance (θJA = 250°C/W) and PCB area savings versus standard SOT-23. |
Pinout & Package
Package: TSOT-23-6 (ThinSOT™), 1.90mm × 2.80mm × 1.00mm max height, exposed pad not present. Pin 1 marked with dot; pin numbering follows JEDEC MO-193 standard.
| 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 IQ; must not float. |
| GND (Pin 2) | Power and signal reference | Primary return path for input capacitor, inductor, and IC ground currents; requires low-inductance connection to PCB ground plane. |
| SW (Pin 3) | Switch node | Connects to inductor and internal P/N-MOSFET drains; carries high di/dt square-wave current - critical for EMI and layout integrity. |
| VIN (Pin 4) | Main power input | Supplies both IC bias and switching power; requires local 2.2µF+ ceramic decoupling directly to GND (Pin 2). |
| VOUT (Pin 5) | Regulated output | Internal resistor divider sets 1.5V; connects to output capacitor and load; feedback path is internal and non-accessible. |
| MODE (Pin 6) | Operating mode select | GND = Burst Mode™ (ultra-low IQ); VIN = pulse-skipping mode (lower ripple >25mA); floating prohibited. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing BOM count and improving efficiency by ~5–8% at mid-load versus asynchronous designs. |
| Ceramic capacitor stability | No ESR dependency in control loop - enables use of low-ESR, small-footprint X5R/X7R ceramics for <10mVPP output ripple. |
| 100% duty cycle operation | Maintains regulation down to VIN – VOUT ≈ 0V - extends usable battery range by up to 150mV compared to non-100% duty-cycle regulators. |
| Overvoltage lockout | Triggers at +2.5% to +13% VOUT excursion - protects downstream 1.5V logic from transient overvoltage during startup or fault conditions. |
| Thermal shutdown | Activates at TJ ≈ 150°C - prevents permanent damage under sustained overload or poor PCB thermal design. |
Applications
| Cellular Baseband Power | Digital Still Camera Core Supply |
|---|---|
Use Scenario: Powering ARM Cortex-M4-based baseband processor in GSM/UMTS feature phone operating from single Li-ion cell (2.7V–4.2V). IC Role / Device Role / Timing Role: Primary 1.5V core voltage regulator delivering clean, low-noise supply with fast transient response to CPU load steps. Use Value: 93% peak efficiency and 20µA Burst Mode current extend talk time by >12% versus legacy LDO solutions; 1.5MHz switching avoids audible noise in speaker circuits. | Use Scenario: Supplying image sensor interface logic and ISP core in compact digital still camera with tight board space constraints. IC Role / Device Role / Timing Role: Fixed-output buck converter providing regulated 1.5V rail for high-speed parallel data paths and timing-critical pixel readout circuits. Use Value: TSOT-23-6 footprint saves >40% PCB area versus SOIC-8 alternatives; ceramic-capacitor compatibility enables <5mm² total solution size including inductor. |
| Wireless Modem RF Bias | Portable Medical Sensor Node |
Use Scenario: Generating stable 1.5V bias for LTE/Wi-Fi RF transceiver ICs in battery-powered DSL/wireless modem. IC Role / Device Role / Timing Role: Low-noise, high-PSRR DC/DC source feeding RF synthesizer VCO and mixer bias networks. Use Value: Pulse-skipping mode (MODE = VIN) suppresses switching ripple below 10mVPP, preventing LO pulling and adjacent-channel interference in sensitive RF sections. | Use Scenario: Powering ultra-low-power MCU, analog front-end, and BLE radio in wearable ECG patch with multi-year battery life target. IC Role / Device Role / Timing Role: Primary energy-harvesting-optimized regulator enabling continuous sensing during sleep (2µA system current) and burst processing (150mA peaks). Use Value: 20µA quiescent current in Burst Mode preserves >95% of battery capacity during 99% idle time; 100% duty cycle sustains operation down to 1.55V battery voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 1.5V fixed, 300mA, 2.05–6.0V input, 3.6MHz switching, 17µA IQ, WSON-6 package (2.0×2.0mm) | Higher fSW enables smaller inductors but increases switching losses above 100mA; no Burst Mode - uses DCS-Control™ for light-load efficiency. | Select when board space is more constrained than thermal budget, and when higher-frequency EMI can be filtered locally. |
| MAX17222ATA+T | 1.5V fixed, 500mA, 0.7–5.5V input, 1.6MHz, 1.6µA IQ in shutdown, 12µA in regulation, 6-bump WLP package (1.22×0.84mm) | Wider input range includes coin-cell (0.9V) support; lower IQ benefits multi-year battery life; smaller package demands advanced assembly. | Select for space-constrained, long-life applications where 500mA headroom and sub-1V start-up are required. |
Compared with TPS62231DRVR and MAX17222ATA+T, the LTC3405AES6-1.5#TRPBF offers superior thermal performance in TSOT-23 (250°C/W vs ~300°C/W for WSON/WLP), proven Burst Mode™ behavior for predictable light-load efficiency, and broader industrial temperature validation (–40°C to 85°C) without derating.
Availability
LTC3405AES6-1.5#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, wireless modems, and portable medical instruments requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3405AES6-1.5#TRPBF 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 digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3405AES6-1.5#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC converters, engineered specifically for battery-powered portable electronics demanding minimal quiescent current, small solution size, and robust transient response.
FAQ
What is the maximum output current capability of the LTC3405AES6-1.5#TRPBF across its full input voltage range?
The LTC3405AES6-1.5#TRPBF delivers up to 300mA continuous output current when VIN ≥ 3V. At lower inputs (e.g., 2.5V), maximum current drops to ~220mA due to reduced duty-cycle headroom and increased conduction losses - see Figure F02 in the datasheet for exact VIN-vs-IOUT curves. Derating is required above 70°C ambient per θJA = 250°C/W.
Does the LTC3405AES6-1.5#TRPBF require an external Schottky diode?
No, the LTC3405AES6-1.5#TRPBF does not require an external Schottky diode. It integrates both a P-channel main switch and an N-channel synchronous rectifier, eliminating body-diode conduction losses and enabling >90% efficiency without external components - a key differentiator versus asynchronous buck controllers.
How does the MODE pin affect efficiency and output ripple in the LTC3405AES6-1.5#TRPBF?
When MODE is grounded, the LTC3405AES6-1.5#TRPBF enters Burst Mode™, achieving 20µA IQ and peak efficiency >85% at 1mA load but with higher output ripple (~20mVPP). When MODE is tied to VIN, it operates in pulse-skipping mode - ripple drops to <5mVPP above 25mA, though light-load efficiency falls to ~70%. The choice depends on system noise sensitivity versus battery life priority.
Can the LTC3405AES6-1.5#TRPBF operate with ceramic capacitors only, and what dielectric is recommended?
Yes, the LTC3405AES6-1.5#TRPBF is fully stable with ceramic output capacitors - its current-mode control loop does not rely on ESR for compensation. X5R or X7R dielectrics are strongly recommended for both CIN and COUT due to their stable capacitance vs. temperature and DC bias, avoiding the capacitance collapse seen in Y5V/Z5U types at rated voltage.
What thermal considerations apply to the LTC3405AES6-1.5#TRPBF in a 70°C ambient environment?
In a 70°C ambient, the LTC3405AES6-1.5#TRPBF's junction temperature remains within spec (TJ ≤ 125°C) up to ~300mA at VIN = 3.6V, assuming standard 2-layer PCB with 1oz copper. Calculated TJ = 70°C + (PD × 250°C/W), where PD ≈ IOUT² × RSW (RSW ≈ 0.88Ω at 70°C). For sustained 300mA operation, add thermal relief pads or increase copper area around GND pin.
LTC3405AES6-1.5#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):
- 1.5V
- 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#TRPBF FAQ
1.How can I place an order for LTC3405AES6-1.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3405AES6-1.5#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 LTC3405AES6-1.5#TRPBF reliable?
The price and inventory of LTC3405AES6-1.5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3405AES6-1.5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3405AES6-1.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3405AES6-1.5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3405AES6-1.5#TRPBF?
LTC3405AES6-1.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3405AES6-1.5#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 LTC3405AES6-1.5#TRPBF?
For technical support, including LTC3405AES6-1.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3405AES6-1.5#TRPBF requirements.
6.How does Aetrix verify that LTC3405AES6-1.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3405AES6-1.5#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 LTC3405AES6-1.5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3405AES6-1.5#TRPBF?
All LTC3405AES6-1.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3405AES6-1.5#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 LTC3405AES6-1.5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3405AES6-1.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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