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Analog Devices Inc. LTC3406B-2ES5#TRMPBF
- Part No.:
- LTC3406B-2ES5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC3406B-2ES5#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:978
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Product details
Overview
LTC3406B-2ES5#TRMPBF from Analog Devices (formerly Linear Technology) is a high-efficiency monolithic synchronous step-down DC/DC regulator using constant-frequency current-mode control. It delivers up to 600mA output current from a 2.5V–5.5V input, features 2.25MHz switching, 0.6V reference for low-output-voltage designs (e.g., 1.2V, 1.5V, 1.8V, 2.5V), and operates in 100% duty cycle for ultra-low dropout-enabling extended battery life in single Li-ion portable systems.
For engineers reviewing the LTC3406B-2ES5#TRMPBF datasheet, LTC3406B-2ES5#TRMPBF pinout, LTC3406B-2ES5#TRMPBF application, or LTC3406B-2ES5#TRMPBF equivalent, key selection considerations include its SOT-23-5 thin-package thermal performance, integrated P/N-channel MOSFETs eliminating external Schottky diodes, pulse-skipping light-load operation, and precise 0.6V ±1.5% feedback reference across –40°C to 85°C.
Technical Context
The LTC3406B-2ES5#TRMPBF implements a constant-frequency (2.25MHz nominal), current-mode synchronous buck architecture with internal P-channel main switch (RDS(ON) = 0.4Ω typ at 25°C) and N-channel synchronous rectifier (RDS(ON) = 0.35Ω typ). Its error amplifier drives peak-current control via slope-compensated PWM, enabling stable operation up to 95% duty cycle without subharmonic oscillation.
It supports pulse-skipping mode at light loads to maintain regulation while minimizing quiescent current (350µA no-load, <1µA shutdown), includes overtemperature protection (trip at ~150°C), and features built-in overvoltage lockout (20–80mV above VFB). The RUN pin enables precise system-level power sequencing with 0.3V–1.5V logic threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion (2.7V–4.2V) and 5V rail applications without external LDO pre-regulation. |
| Output Current | 600mA continuous - sufficient for core logic, RF transceivers, and sensor subsystems in portable electronics. |
| Switching Frequency | 2.25MHz (typ) - enables use of compact 2.2µH inductors and small ceramic capacitors (e.g., 4.7µF CIN, 10µF COUT). |
| Feedback Reference | 0.6V ±1.5% (–40°C to 85°C) - allows accurate, low-noise output programming down to 0.6V with standard resistor dividers. |
| Quiescent Current | 350µA (no load), <1µA (shutdown) - preserves battery runtime during standby and deep-sleep modes. |
| Efficiency | Up to 96% at 600mA - achieved via synchronous rectification and low RDS(ON) switches, reducing I²R losses vs. diode-based solutions. |
| Duty Cycle Range | 0% to 100% - supports true dropout operation (VIN ≈ VOUT) critical for end-of-battery-life operation. |
Pinout & Package
Package: 5-lead TSOT-23 (S5), 1mm profile, 0.95mm × 2.9mm footprint - optimized for space-constrained portable PCB layouts with exposed pad thermal path (θJA = 250°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/Shutdown Control Input | Logic-high (>1.5V) enables regulation; logic-low (<0.3V) forces <1µA shutdown - enables system-level power gating and sequencing. |
| GND (Pin 2) | Power and Signal Ground Reference | Common return for VIN, SW, VFB, and internal circuitry - must be low-impedance connection to minimize noise coupling and voltage drop. |
| SW (Pin 3) | Switch Node | Connection point between internal P- and N-MOSFET drains - routes high dv/dt switching waveform; requires short, wide trace away from sensitive nodes (e.g., VFB). |
| VIN (Pin 4) | Main Input Supply | Primary power input (2.5V–5.5V); requires local 4.7µF ceramic decoupling to GND to suppress high-frequency ripple and supply transients. |
| VFB (Pin 5) | Feedback Input | High-impedance (±30nA bias) node sensing resistive divider output - connects directly to COUT+ for remote sensing; sets output via VOUT = 0.6V × (1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Eliminates external Schottky diode - reduces conduction loss, improves efficiency by 5–10% vs. asynchronous buck, and simplifies BOM. |
| 100% Duty Cycle Operation | Enables VOUT regulation even when VIN drops to within ~100mV of VOUT - extends usable battery voltage range in Li-ion systems. |
| 2.25MHz Fixed Switching | Permits miniature passive components (e.g., 2.2µH inductor, 10µF ceramic output cap) - shrinks solution size >40% vs. 500kHz alternatives. |
| Pulse-Skipping Light-Load Mode | Maintains tight output regulation at µA-level loads while holding IQ <350µA - avoids audible noise and improves standby efficiency. |
| Integrated Overtemperature Protection | Thermal shutdown activates at ~150°C junction temperature - prevents permanent damage during overload or poor heatsinking conditions. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor core voltage (1.2V/600mA) from single Li-ion battery (2.7V–4.2V). IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated core supply with fast transient response to CPU load changes. Use Value: 96% peak efficiency and 100% duty cycle extend talk time by >15% vs. legacy 500kHz converters; 2.25MHz operation minimizes EMI in RF-sensitive bands. | Use Scenario: Generating 3.3V/600mA for Wi-Fi/Bluetooth radio subsystem from 5V USB input. IC Role / Device Role / Timing Role: Compact, high-frequency step-down converter supplying clean, low-noise power to RF front-end ICs. Use Value: Integrated MOSFETs and 0.6V reference enable precise 3.3V output with <1% load regulation; TSOT-23 package fits tight RF module layouts. |
| Digital Still Cameras | Portable Instruments |
Use Scenario: Providing 1.8V/600mA to image sensor and ISP ASIC during burst capture mode. IC Role / Device Role / Timing Role: High-efficiency, low-noise power stage supporting rapid on/off cycling and dynamic load steps. Use Value: Pulse-skipping mode maintains 1.8V regulation at µA standby currents; fast load-transient response (<20µs recovery) prevents image artifacts during exposure. | Use Scenario: Regulating 2.5V/600mA for precision ADCs, op-amps, and microcontrollers in handheld test equipment. IC Role / Device Role / Timing Role: Low-drift, low-noise DC/DC source with tight line/load regulation for analog signal chain integrity. Use Value: 0.6V ±1.5% reference and <0.5% load regulation ensure stable 2.5V output across temperature and load - critical for 16-bit ADC accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 2.25MHz fixed frequency, 600mA, 0.6V ref, but uses external compensation and lacks 100% duty cycle. | Requires external RC network for loop stability; unsuitable for true dropout operation below VOUT + 0.2V. | Select LTC3406B-2ES5#TRMPBF when dropout headroom is constrained or board space prohibits compensation components. |
| RT8059GJ6 | 2.5MHz, 600mA, 0.6V ref, integrated soft-start, but higher quiescent current (500µA typ) and no overtemperature protection. | Higher IQ reduces battery life in always-on instrumentation; missing thermal protection increases system-level safety risk. | Choose LTC3406B-2ES5#TRMPBF for long-duration portable devices requiring robust thermal management and ultra-low IQ. |
Compared with TPS62231DRVR and RT8059GJ6, the LTC3406B-2ES5#TRMPBF uniquely combines 100% duty cycle, integrated thermal protection, and industry-leading 350µA quiescent current in a 5-pin TSOT-23 - making it optimal for space- and battery-limited Li-ion applications demanding reliability across full temperature range.
Availability
LTC3406B-2ES5#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, digital still cameras, and portable instruments requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LTC3406B-2ES5#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 continues to develop, manufacture, and support its high-performance power management portfolio.
The LTC3406B-2ES5#TRMPBF belongs to Linear's ThinSOT™ synchronous buck regulator family, designed specifically for ultra-compact, high-efficiency power conversion in battery-powered portable electronics where thermal, size, and efficiency constraints dominate.
FAQ
What is the maximum output current capability of the LTC3406B-2ES5#TRMPBF?
The LTC3406B-2ES5#TRMPBF delivers up to 600mA continuous output current under typical conditions (e.g., VIN = 3.6V, VOUT = 1.8V, TA = 25°C). Maximum current scales with input voltage and ambient temperature - for example, at VIN = 2.7V and TA = 70°C, the practical limit is ~500mA due to increased RDS(ON) and thermal limits. Full derating curves are provided in Figure 2 of the official datasheet.
Does the LTC3406B-2ES5#TRMPBF require an external Schottky diode?
No, the LTC3406B-2ES5#TRMPBF does not require an external Schottky diode. It integrates both a P-channel main switch and an N-channel synchronous rectifier, enabling fully synchronous operation that eliminates conduction losses and heat generation associated with external diodes. This integration directly contributes to its 96% peak efficiency and simplified bill-of-materials.
What is the operating temperature range specified for the LTC3406B-2ES5#TRMPBF?
The LTC3406B-2ES5#TRMPBF is guaranteed over 0°C to 70°C for all electrical specifications. Performance across –40°C to 85°C is assured by design, characterization, and statistical process controls - making it suitable for industrial and consumer portable applications. Junction temperature must not exceed 125°C continuously, with overtemperature protection activating near 150°C.
How is the output voltage programmed on the LTC3406B-2ES5#TRMPBF?
The output voltage of the LTC3406B-2ES5#TRMPBF is set using a resistive divider connected between VOUT and GND, with the midpoint fed into the VFB pin. The formula is VOUT = 0.6V × (1 + R1/R2), where R1 connects to VOUT and R2 connects to GND. For example, to achieve 1.8V output, use R1 = 499kΩ and R2 = 220kΩ. Layout best practice requires routing the VFB trace directly to the COUT+ pad for remote sensing.
Can the LTC3406B-2ES5#TRMPBF operate in dropout mode, and what does that mean for system design?
Yes, the LTC3406B-2ES5#TRMPBF supports true dropout operation via 100% duty cycle - meaning the internal P-channel switch remains continuously on when VIN approaches VOUT. In this mode, VOUT ≈ VIN – ILOAD × RDS(ON), extending usable battery life in Li-ion systems down to ~2.7V. Designers must verify thermal rise at low VIN, as RDS(ON) increases with temperature and reduces effective headroom.
LTC3406B-2ES5#TRMPBF 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 600mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LTC3406B-2ES5#TRMPBF FAQ
1.How can I place an order for LTC3406B-2ES5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3406B-2ES5#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 LTC3406B-2ES5#TRMPBF reliable?
The price and inventory of LTC3406B-2ES5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3406B-2ES5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3406B-2ES5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3406B-2ES5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3406B-2ES5#TRMPBF?
LTC3406B-2ES5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3406B-2ES5#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 LTC3406B-2ES5#TRMPBF?
For technical support, including LTC3406B-2ES5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3406B-2ES5#TRMPBF requirements.
6.How does Aetrix verify that LTC3406B-2ES5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3406B-2ES5#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 LTC3406B-2ES5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3406B-2ES5#TRMPBF?
All LTC3406B-2ES5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3406B-2ES5#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 LTC3406B-2ES5#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3406B-2ES5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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