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Analog Devices Inc. LTC3405ES6#TRPBF
- Part No.:
- LTC3405ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3405ES6#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,929
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Product details
Overview
LTC3405ES6#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter optimized for single-cell Li-Ion battery-powered systems. It delivers up to 300mA output current with 96% peak efficiency, operates from 2.5V to 5.5V input, uses constant-frequency current-mode control at 1.5MHz, and supports low dropout via 100% duty cycle operation - enabling extended runtime in portable instrumentation and digital cameras.
For engineers reviewing the LTC3405ES6#TRPBF datasheet, LTC3405ES6#TRPBF pinout, LTC3405ES6#TRPBF application, or LTC3405ES6#TRPBF equivalent, key selection criteria include its 20µA operating quiescent current, ±2% output voltage accuracy over temperature, integrated P/N-channel MOSFETs eliminating external Schottky diodes, and ThinSOT-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC3405ES6#TRPBF implements a constant-frequency, current-mode synchronous buck architecture with internal 0.8V reference, slope-compensated PWM control, and dual-MOSFET power stage (0.7Ω P-channel main switch, 0.6Ω N-channel synchronous switch). Its burst mode and pulse-skipping mode selection via MODE pin enables dynamic efficiency optimization across load ranges.
It features overtemperature protection, output overvoltage lockout (20–80mV above VFB), and robust transient response due to current-mode control - delivering stable regulation under fast load steps from 0mA to 250mA with <100mV undershoot/overshoot. Shutdown draws <1µA, and RUN pin threshold is 0.3V to 1.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports full discharge curve of single Li-Ion (2.7V–4.2V) without external LDO pre-regulation. |
| Output Current | 300mA max at VIN = 3V - sufficient for core logic and I/O rails in handheld devices. |
| Switching Frequency | 1.5MHz (typ) - enables use of compact 4.7µH inductors and ceramic capacitors ≤10µF. |
| Quiescent Current | 20µA during operation - minimizes standby drain in always-on sensor nodes. |
| Feedback Reference | 0.8V ±2% - allows precise programming of output voltages down to 0.8V (e.g., 1.3V, 1.5V, 1.8V) using standard resistor ratios. |
| Duty Cycle Range | 0% to 100% - supports dropout operation when VIN approaches VOUT, extending battery life. |
| Thermal Resistance | θJA = 250°C/W (ThinSOT-6) - requires minimal copper area for thermal management below 300mA loads. |
Pinout & Package
Package: 6-lead ThinSOT-6 (TSOT-23-6), 1mm profile, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable control input | Logic-high (>1.5V) enables regulator; <0.3V forces shutdown (<1µA IQ); must not float. |
| GND (Pin 2) | Power and signal reference | Primary return path for SW node current and feedback network; requires low-inductance connection to power plane. |
| SW (Pin 3) | Switch node | Drain connection of internal P- and N-channel MOSFETs; carries high di/dt square-wave current - critical for EMI and layout. |
| VIN (Pin 4) | Main input supply | Accepts 2.5V–5.5V; must be decoupled with ≥2.2µF ceramic capacitor placed adjacent to pin. |
| VFB (Pin 5) | Feedback input | Monitors resistive divider output; compares to 0.8V reference to regulate VOUT; high-impedance (±30nA bias). |
| MODE (Pin 6) | Operating mode select | Ground = Burst Mode (20µA IQ, higher ripple); connect to VIN = Pulse-Skipping Mode (lower ripple, >25mA efficiency crossover). |
Key Features
| Feature | Design Value |
|---|---|
| No external Schottky diode required | Integrated synchronous N-channel MOSFET eliminates conduction loss and board area for discrete diode. |
| 100% duty cycle low-dropout operation | Maintains regulation even when VIN ≈ VOUT (e.g., 2.8V → 2.5V), maximizing usable battery capacity. |
| Burst Mode and Pulse-Skipping Mode | User-selectable via MODE pin to optimize efficiency vs. noise trade-off across 0.1mA–300mA load range. |
| Overtemperature protection | Thermal shutdown disables both switches if junction exceeds ~150°C, preventing damage during overload or poor heatsinking. |
| Stable with ceramic output capacitors | Supports 4.7µF X5R/X7R ceramics in pulse-skipping mode (VIN ≤ 4.2V), reducing BOM cost and footprint vs. tantalum. |
Applications
| Digital Still Cameras | Wireless Modems |
|---|---|
Use Scenario: Powering image sensor analog front-end and ISP core logic from single Li-Ion cell. IC Role / Device Role / Timing Role: Primary synchronous buck regulator generating 1.8V/2.8V rails with fast transient response to burst capture events. Use Value: 96% efficiency at 200mA extends battery life per shot; 20µA quiescent current preserves charge during standby. |
Use Scenario: Supplying RF transceiver and baseband processor in LTE/DSL modem modules. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter delivering stable 1.3V/1.5V core voltage with low noise in burst transmission mode. Use Value: Burst Mode reduces average IQ to 20µA during idle, while Pulse-Skipping ensures clean 10mVpp ripple during active data transfer. |
| Portable Medical Instruments | MP3 Players |
Use Scenario: Regulating power for low-noise ADCs, op-amps, and microcontroller in handheld diagnostic tools. IC Role / Device Role / Timing Role: Low-ripple, precision-output buck converter with ±2% accuracy ensuring measurement integrity. Use Value: 0.8V reference enables accurate 3.3V rail generation; 1.5MHz switching avoids audible noise in sensitive analog sections. |
Use Scenario: Supplying NAND flash memory and audio codec in battery-powered music players. IC Role / Device Role / Timing Role: Compact, high-efficiency DC/DC providing 3.3V system rail and 1.2V core voltage from 3.6V nominal Li-Ion. Use Value: ThinSOT-6 footprint saves PCB space; 100% duty cycle sustains playback until battery reaches 2.7V cutoff. |
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 | Higher 3MHz switching frequency; lower 17µA IQ; fixed 1.8V/3.3V options only; no MODE pin for mode selection. | Requires external resistor divider for adjustable outputs; less flexible in multi-rail designs needing programmable VOUT. | Preferred for fixed-output, ultra-low-IQ applications where board space is critical and output voltage is static. |
| MAX17532ATA+T | Wider 4.5V–60V input range; 600mA output; external MOSFETs; no integrated switches; requires compensation network. | Designed for industrial/high-voltage inputs; unsuitable for Li-Ion direct connection without pre-regulator. | Only suitable when input exceeds 5.5V or output current >300mA is required; adds complexity and component count. |
Compared with LTC3405ES6#TRPBF, TPS62231DRVR offers better light-load efficiency but lacks output adjustability and mode flexibility, while MAX17532ATA+T supports higher input voltages but introduces design overhead and is incompatible with direct single-cell battery operation.
Availability
LTC3405ES6#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, digital cameras, wireless modems, and MP3 players requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3405ES6#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 and maintains full product support, documentation, and manufacturing continuity for all Linear ICs including the LTC series.
The LTC3405ES6#TRPBF belongs to Linear's high-efficiency, low-quiescent-current DC/DC converter family designed specifically for battery-powered portable electronics demanding small size, high light-load efficiency, and robust thermal performance.
FAQ
What is the maximum output current capability of the LTC3405ES6#TRPBF?
The LTC3405ES6#TRPBF delivers up to 300mA output current when VIN = 3V. At lower input voltages (e.g., 2.7V), maximum output current decreases due to increased RDS(ON) of the internal P-channel switch - Figure 2 in the datasheet shows derating curves for 1.3V, 1.8V, and 2.5V outputs. Peak inductor current is limited to 625mA (typ) to ensure safe operation.
Does the LTC3405ES6#TRPBF require an external Schottky diode?
No, the LTC3405ES6#TRPBF does not require an external Schottky diode. It integrates both a P-channel main switch and an N-channel synchronous rectifier, eliminating conduction losses and board space associated with discrete diodes. This integration directly contributes to its 96% peak efficiency and simplified bill-of-materials.
How do I configure the LTC3405ES6#TRPBF for adjustable output voltage?
Configure the LTC3405ES6#TRPBF output voltage using a resistive divider from VOUT to GND, with the midpoint connected to VFB. The formula is VOUT = 0.8V × (1 + R1/R2). For example, R1 = 887kΩ and R2 = 280kΩ yields 3.3V. Ensure VFB bias current (±30nA) does not introduce significant error - use resistor values ≤1MΩ for best accuracy.
What are the thermal limitations of the LTC3405ES6#TRPBF in ThinSOT-6 package?
The LTC3405ES6#TRPBF has θJA = 250°C/W in the ThinSOT-6 package. At 300mA load and 2.7V input (dropout), power dissipation is ~85mW, resulting in ~91°C junction temperature at 70°C ambient - well below the 125°C maximum. Derate output current above 70°C ambient or add copper thermal pad if operating continuously near limits.
Can the LTC3405ES6#TRPBF operate with ceramic output capacitors only?
Yes, the LTC3405ES6#TRPBF is stable with ceramic output capacitors in Pulse-Skipping Mode when VIN ≤ 4.2V - a 4.7µF X5R/X7R ceramic suffices. In Burst Mode, stability requires either a parallel tantalum (e.g., 22µF) or feedforward compensation (Figure 5). Always use X5R/X7R dielectrics for stable capacitance across voltage and temperature.
LTC3405ES6#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- 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
LTC3405ES6#TRPBF FAQ
1.How can I place an order for LTC3405ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3405ES6#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 LTC3405ES6#TRPBF reliable?
The price and inventory of LTC3405ES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3405ES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3405ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3405ES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3405ES6#TRPBF?
LTC3405ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3405ES6#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 LTC3405ES6#TRPBF?
For technical support, including LTC3405ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3405ES6#TRPBF requirements.
6.How does Aetrix verify that LTC3405ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3405ES6#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 LTC3405ES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3405ES6#TRPBF?
All LTC3405ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3405ES6#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 LTC3405ES6#TRPBF part is unused and in its original packaging.
Return procedure for LTC3405ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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