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Analog Devices Inc. LTC3406BES5-1.8#TRPBF
- Part No.:
- LTC3406BES5-1.8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC3406BES5-1.8#TRPBF.pdf
- Description:
- IC REG BUCK 1.8V 600MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,924
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Product details
Overview
LTC3406BES5-1.8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator in a 5-lead TSOT-23 package, delivering up to 600mA output current at 1.8V with 2.5V–5.5V input range, 1.5MHz fixed switching frequency, and 96% peak efficiency. It serves as the primary power conversion stage for Li-ion–powered portable electronics requiring low quiescent current and dropout operation.
For engineers reviewing the LTC3406BES5-1.8#TRPBF datasheet, LTC3406BES5-1.8#TRPBF pinout, LTC3406BES5-1.8#TRPBF application, or LTC3406BES5-1.8#TRPBF equivalent, key selection criteria include verified 1.8V fixed output accuracy (±3%), integrated P/N-channel MOSFETs with RDS(ON) ≤ 0.5Ω, shutdown current <1µA, and thermal performance validated to 125°C junction temperature in ThinSOT packaging.
Technical Context
The LTC3406BES5-1.8#TRPBF employs constant-frequency current-mode control with internal slope compensation, enabling stable operation across 0–100% duty cycle. Its architecture integrates a 0.6V reference, overvoltage lockout (7.8% above VOUT), and current reversal detection to manage discontinuous conduction mode at light loads.
It features dual internal MOSFETs - a P-channel high-side switch (RDS(ON) = 0.4Ω typ.) and N-channel synchronous rectifier (RDS(ON) = 0.35Ω typ.) - eliminating external Schottky diodes. Pulse-skipping mode maintains regulation below 10mA load while minimizing output ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% (1.746V–1.854V) - ensures stable core voltage for 1.8V logic and RF ICs without external feedback resistors. |
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion (2.7V–4.2V) and USB-powered systems with margin for voltage drop. |
| Max Output Current | 600mA continuous - sufficient for baseband processors, PMIC rails, and sensor subsystems in handheld devices. |
| Switching Frequency | 1.5MHz (±20%) - enables use of compact 2.2µH inductors and ceramic capacitors, reducing board area and EMI filtering burden. |
| Quiescent Current | 300µA (no load), <1µA in shutdown - extends battery runtime in standby and sleep modes. |
| Duty Cycle Range | 0% to 100% - supports low-dropout operation down to VIN ≈ VOUT, critical for end-of-discharge battery life extension. |
| Thermal Limit | Junction temperature max 125°C; θJA = 250°C/W - requires minimal copper pour for thermal management in thin portable PCBs. |
Pinout & Package
Package: 5-lead TSOT-23 (ThinSOT™), 1mm profile, 0.95mm × 2.9mm footprint - optimized for space-constrained portable designs.
| 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 current - used for system-level power sequencing. |
| GND (Pin 2) | Power and signal reference | Common return path for input capacitor, inductor, and feedback network - must be low-impedance connection to minimize noise coupling. |
| SW (Pin 3) | Switch node | Drain connection of internal P- and N-channel MOSFETs - routes high dv/dt switching waveform to inductor; requires short, wide trace to reduce EMI. |
| VIN (Pin 4) | Main input supply | Connects to 2.5V–5.5V source and local 4.7µF ceramic decoupling capacitor - supplies gate drive and bias current for internal circuitry. |
| VOUT (Pin 5) | Fixed-output feedback | Internally connected to 1.8V divider; provides regulated output voltage - no external resistor required; used for remote sensing in precision applications. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - reduces conduction loss by ~300mV forward drop, improving efficiency at medium-to-heavy loads. |
| 100% duty cycle operation | Enables dropout regulation down to VIN = VOUT + ILOAD × RDS(ON) - extends usable battery voltage range by ~150mV vs non-synchronous alternatives. |
| Pulse-skipping mode | Maintains output regulation at loads <10mA with <1µA quiescent current - avoids burst-mode noise while preserving light-load efficiency. |
| Overvoltage lockout | Triggers at VOUT > 1.8V + 7.8% (≈1.94V) - protects downstream 1.8V logic from transient overvoltage during startup or load dump. |
| Internal 0.6V reference | Stable across –40°C to +85°C (±0.015V drift) - enables accurate 1.8V output without trimming or external components. |
Applications
| Cellular Telephones | Digital Still Cameras |
|---|---|
Use Scenario: Powering baseband processor core rail in GSM/UMTS smartphones operating from single Li-ion cell. IC Role / Device Role / Timing Role: Primary buck converter supplying regulated 1.8V to CPU I/O and memory interface circuits. Use Value: 96% peak efficiency and 300µA quiescent current extend talk time by >12% versus legacy linear regulators under mixed load profiles. |
Use Scenario: Supplying image sensor analog front-end and ISP core voltage in compact digital cameras. IC Role / Device Role / Timing Role: Fixed-output DC/DC regulator delivering clean 1.8V with low ripple (<10mVpp) for noise-sensitive pixel readout. Use Value: 1.5MHz switching frequency allows use of small 2.2µH inductor and 10µF ceramic output cap - reduces solution size by 40% vs lower-frequency alternatives. |
| Wireless Modems | Portable Instruments |
Use Scenario: Providing stable 1.8V supply to Wi-Fi/BT SoC RF transceivers in battery-powered IoT gateways. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting dynamic load steps from 1mA (sleep) to 600mA (transmit). Use Value: Fast transient response (≤20µs recovery from 50mA→600mA step) prevents RF desense during packet transmission bursts. |
Use Scenario: Powering microcontroller, ADC, and display driver in handheld test equipment with 8-hour battery life target. IC Role / Device Role / Timing Role: Main system rail converter operating across full battery discharge curve (4.2V→2.7V). Use Value: 100% duty cycle capability sustains 1.8V output down to 2.75V input - adds ~18 minutes of operational time at end-of-discharge. |
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 | 1.8V fixed output, 600mA, 3MHz switching, 2.05V–6.5V input - higher frequency but higher quiescent current (17µA active, 1µA shutdown). | Better suited for ultra-compact layouts needing smaller inductors; less optimal for long battery life due to higher light-load IQ. | Select when board space is constrained and 3MHz operation simplifies EMI filtering; avoid if sub-10µA average IQ is required. |
| MP2108DQ-LF-Z | 1.8V fixed output, 600mA, 1.5MHz, 2.5V–5.5V input - similar specs but lacks overvoltage lockout and has higher RDS(ON) (0.65Ω P-FET). | Lower protection level for sensitive 1.8V loads; reduced efficiency at high load due to higher conduction loss. | Acceptable for cost-sensitive consumer applications where OVL is not mandated; verify thermal rise at 600mA in TSOT-23. |
Compared with TPS62231DRYR and MP2108DQ-LF-Z, the LTC3406BES5-1.8#TRPBF offers superior light-load efficiency (300µA vs 17µA), integrated OVL protection, and lower RDS(ON), making it preferred for battery-critical portable instrumentation and communication devices.
Availability
LTC3406BES5-1.8#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, wireless modems, portable instruments, and Li-ion–powered embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.
Supply support for LTC3406BES5-1.8#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving aerospace, industrial, automotive, and communications markets.
The LTC3406B series was designed specifically for space- and power-constrained portable electronics, emphasizing high efficiency across wide load ranges, ultra-low shutdown current, and robust thermal behavior in miniature packages like TSOT-23.
FAQ
What is the output voltage tolerance of the LTC3406BES5-1.8#TRPBF over temperature and line?
The LTC3406BES5-1.8#TRPBF delivers a fixed 1.8V output with ±3% total tolerance over –40°C to +85°C ambient and 2.5V–5.5V input range. This corresponds to 1.746V minimum and 1.854V maximum, verified per Electrical Characteristics table in the official datasheet. The internal 0.6V reference contributes ±0.015V drift across temperature, ensuring tight regulation without external trimming.
Does the LTC3406BES5-1.8#TRPBF require an external Schottky diode?
No, the LTC3406BES5-1.8#TRPBF does not require an external Schottky diode. It integrates both a P-channel high-side switch and an N-channel synchronous rectifier, enabling full synchronous rectification. This eliminates forward-voltage losses associated with external diodes and improves efficiency by up to 8% at 300mA load compared to asynchronous buck converters.
What is the maximum junction temperature and thermal resistance of the LTC3406BES5-1.8#TRPBF in its TSOT-23 package?
The LTC3406BES5-1.8#TRPBF has a maximum junction temperature (TJMAX) of 125°C and a junction-to-ambient thermal resistance (θJA) of 250°C/W in the standard 5-lead TSOT-23 package. At 600mA load and 2.7V input, calculated power dissipation is ~187mW, resulting in a junction temperature rise of 46.8°C - well within safe operating limits at 70°C ambient.
How does the LTC3406BES5-1.8#TRPBF behave during input voltage dropout conditions?
During input voltage dropout, the LTC3406BES5-1.8#TRPBF operates in 100% duty cycle mode, maintaining regulation as long as VIN ≥ VOUT + ILOAD × RDS(ON). With RDS(ON) ≈ 0.52Ω at 70°C, it sustains 1.8V output down to ~2.75V input at 600mA - extending usable battery life beyond conventional buck regulators that cease regulation earlier in discharge.
Is the LTC3406BES5-1.8#TRPBF pin-compatible with other variants in the LTC3406B family?
Yes, the LTC3406BES5-1.8#TRPBF shares identical 5-lead TSOT-23 pinout and footprint with LTC3406BES5-1.5#TRPBF and the adjustable LTC3406BES5#TRPBF. All variants use RUN, GND, SW, VIN, and VOUT/VFB pins in the same physical arrangement, enabling design reuse across 1.5V, 1.8V, and adjustable-output configurations without PCB changes.
LTC3406BES5-1.8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- 600mA
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LTC3406BES5-1.8#TRPBF FAQ
1.How can I place an order for LTC3406BES5-1.8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3406BES5-1.8#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 LTC3406BES5-1.8#TRPBF reliable?
The price and inventory of LTC3406BES5-1.8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3406BES5-1.8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3406BES5-1.8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3406BES5-1.8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3406BES5-1.8#TRPBF?
LTC3406BES5-1.8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3406BES5-1.8#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 LTC3406BES5-1.8#TRPBF?
For technical support, including LTC3406BES5-1.8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3406BES5-1.8#TRPBF requirements.
6.How does Aetrix verify that LTC3406BES5-1.8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3406BES5-1.8#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 LTC3406BES5-1.8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3406BES5-1.8#TRPBF?
All LTC3406BES5-1.8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3406BES5-1.8#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 LTC3406BES5-1.8#TRPBF part is unused and in its original packaging.
Return procedure for LTC3406BES5-1.8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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