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Analog Devices Inc. LTC3405AES6#TRPBF
- Part No.:
- LTC3405AES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3405AES6#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:11,503
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Product details
Overview
LTC3405AES6#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency monolithic synchronous step-down DC/DC regulator in a 6-lead ThinSOT package, delivering up to 300mA output current with 96% peak efficiency, 1.5MHz fixed switching frequency, and 20µA quiescent current during operation - ideal for single Li-Ion battery-powered portable electronics requiring low-noise, compact power conversion.
For engineers reviewing the LTC3405AES6#TRPBF datasheet, LTC3405AES6#TRPBF pinout, LTC3405AES6#TRPBF application, or LTC3405AES6#TRPBF equivalent, key selection considerations include its 2.5V–5.5V input range, 0.8V feedback reference enabling sub-1.2V outputs, 100% duty-cycle dropout capability, and Burst Mode™ operation for ultra-low IQ at light loads.
Technical Context
The LTC3405AES6#TRPBF employs a constant-frequency, current-mode control architecture with integrated P-channel main and N-channel synchronous switches. Its internal slope compensation prevents subharmonic oscillation above 40% duty cycle while maintaining full peak inductor current capability across all operating conditions.
It supports dual operating modes via the MODE pin: Burst Mode™ (grounded) for <20µA quiescent current at light loads, and pulse-skipping mode (tied to VIN) for lower output ripple and reduced EMI - both leveraging the same 0.8V reference and ±2% output voltage accuracy over temperature and line/load variations.
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 brownout. |
| Output Current | 300mA continuous - sufficient for baseband processors, RF transceivers, and sensor subsystems in handheld devices. |
| Switching Frequency | 1.5MHz (typ.) - enables use of small 2.2–4.7µH inductors and ceramic capacitors for minimal PCB footprint. |
| Quiescent Current | 20µA in operation, <1µA in shutdown - extends battery runtime in standby and sleep states. |
| Feedback Reference | 0.8V ±2% - allows precise regulation down to 0.8V (e.g., 1.2V with 412k/87k divider) using standard resistors. |
| Duty Cycle Range | 0% to 100% - maintains regulation even when input drops to within ~100mV of output (low-dropout mode). |
| Efficiency Peak | 96% at 300mA, VIN=3.6V, VOUT=1.8V - minimizes thermal stress and extends battery life in portable systems. |
| Package | 6-lead ThinSOT (TSOT-23), 1mm height - surface-mount compatible with automated assembly and space-constrained layouts. |
Pinout & Package
Package: 6-lead Plastic TSOT-23 (ThinSOT™), 1mm profile, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/Shutdown Control Input | Logic-high (>1.5V) enables regulator; logic-low (<0.3V) forces <1µA shutdown current - must not float. |
| GND (Pin 2) | Power and Signal Ground Reference | Common return path for input capacitor, output capacitor, and feedback divider - requires low-inductance connection. |
| SW (Pin 3) | Internal Switch Node | Connects to drains of internal P- and N-channel MOSFETs - high di/dt node requiring short, wide trace routing. |
| VIN (Pin 4) | Main Input Supply | Accepts 2.5V–5.5V; requires ≥2.2µF ceramic decoupling capacitor placed adjacent to pin for stability and EMI reduction. |
| VFB (Pin 5) | Feedback Input | Monitors output via external resistor divider; 0.8V reference sets VOUT = 0.8V × (1 + R1/R2) - sensitive analog node, must be shielded from SW noise. |
| MODE (Pin 6) | Operating Mode Selection | Ground = Burst Mode™ (ultra-low IQ); tied to VIN = pulse-skipping mode (lower ripple, higher light-load IQ). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates need for external Schottky diode - improves efficiency by ~5–10% and reduces BOM count and board area. |
| Ceramic capacitor compatibility | Stable with low-ESR ceramic input/output caps - enables <10mVPP output ripple and eliminates tantalum reliability concerns. |
| 100% duty-cycle operation | Maintains regulation as VIN approaches VOUT - critical for maximizing usable battery capacity in Li-Ion systems. |
| Overtemperature protection | Thermal shutdown at ~150°C junction temperature - prevents damage during sustained overload or poor heatsinking. |
| Short-circuit foldback | Oscillator frequency reduces to ~210kHz under output short - limits inductor current and prevents thermal runaway. |
| ±2% output voltage accuracy | Guaranteed over –40°C to +85°C, line, and load - ensures reliable operation of voltage-sensitive digital ICs without post-regulation. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor core voltage (1.2V) from a single Li-Ion cell during active call and deep-sleep modes. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise DC supply with dynamic mode switching to minimize idle current. Use Value: Extends talk time by >15% vs. LDO solutions and enables 100% duty-cycle operation down to 2.7V input without reset events. |
Use Scenario: Generating 1.8V supply for Wi-Fi/BT SoC RF section in battery-powered DSL/wireless modems. IC Role / Device Role / Timing Role: High-frequency synchronous buck converter delivering clean, ripple-free power synchronized to RF transmit bursts. Use Value: Achieves <10mVPP ripple with ceramic caps, avoiding interference with sensitive RF receivers and meeting FCC spectral mask requirements. |
| Digital Still Cameras | Portable Instruments |
Use Scenario: Supplying 2.5V to image sensor and ISP ASIC during burst capture, then dropping to 1.2V in preview mode. IC Role / Device Role / Timing Role: Adaptive voltage regulator supporting dynamic VOUT reprogramming via resistor divider and fast transient response to load steps. Use Value: Delivers <50µs recovery from 100mA→300mA load step, preventing image corruption during rapid frame capture sequences. |
Use Scenario: Powering microcontroller, ADC, and display driver in handheld multimeters or gas detectors with 10-year battery life target. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current buck regulator enabling years of operation on coin-cell or AA batteries. Use Value: Draws only 20µA in active mode and <1µA in shutdown - reduces average system IQ below 1µA in intermittent-sampling applications. |
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 | 2.05V–6.5V input, 300mA, 3.6MHz switching, 17µA IQ, 0.6V ref - higher fSW enables smaller inductors but increases gate charge loss at high VIN. | Better suited for space-constrained designs needing <1mm height and <1µH inductors; less optimal for Li-Ion dropout due to higher min VIN. | Select TPS62231DRYR when board area is critical and input stays >2.7V; prefer LTC3405AES6#TRPBF for full Li-Ion range and proven Burst Mode™ stability. |
| RT8059GJ6 | 2.5V–5.5V input, 500mA, 1.5MHz, 25µA IQ, 0.6V ref - higher current rating but no 100% duty cycle; requires external diode for dropout. | Offers headroom for future current scaling but lacks true low-dropout capability and has higher light-load IQ. | Choose RT8059GJ6 only if >300mA peak load is anticipated and 100% duty cycle is not required; LTC3405AES6#TRPBF remains superior for battery longevity in dropout. |
Compared with TPS62231DRYR and RT8059GJ6, the LTC3405AES6#TRPBF uniquely combines 100% duty-cycle operation, 20µA Burst Mode™ IQ, and ceramic-capacitor stability in a 1mm-profile package - making it the most energy-efficient choice across the entire Li-Ion voltage range.
Availability
LTC3405AES6#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, digital still cameras, and portable instruments requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC3405AES6#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 precision instrumentation, communications, and industrial markets.
The LTC3405AES6#TRPBF belongs to Linear's legacy µPower synchronous buck regulator family, engineered specifically for ultra-low-power portable electronics where battery life, small size, and robust transient response are critical design constraints.
FAQ
What is the maximum output current capability of the LTC3405AES6#TRPBF?
The LTC3405AES6#TRPBF delivers up to 300mA continuous output current at VIN = 3V and ambient temperatures ≤85°C. Peak inductor current capability reaches 625mA (typ.), but sustained output is limited by thermal dissipation in the ThinSOT package - derating is required above 70°C ambient or below 3V input due to increased RDS(ON).
Does the LTC3405AES6#TRPBF require an external Schottky diode?
No, the LTC3405AES6#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 enabling efficiencies up to 96%. This also reduces solution size, cost, and EMI compared to asynchronous buck topologies.
How do I set the output voltage for the LTC3405AES6#TRPBF?
Output voltage is set using a resistive divider from VOUT to GND, connected to the VFB pin. The formula is VOUT = 0.8V × (1 + R1/R2), where R1 connects to VOUT and R2 to GND. For example, 1.8V output uses R1 = 412kΩ and R2 = 87kΩ. The 0.8V reference ensures accuracy within ±2% over temperature and line/load conditions.
What is the difference between Burst Mode™ and pulse-skipping mode on the LTC3405AES6#TRPBF?
Burst Mode™ (MODE = GND) reduces quiescent current to 20µA by disabling switching during light loads and waking only as needed - ideal for battery life. Pulse-skipping mode (MODE = VIN) maintains constant 1.5MHz operation with variable duty cycle, yielding lower output ripple and less EMI but higher light-load IQ (~35µA). Both modes retain ±2% output accuracy.
Is the LTC3405AES6#TRPBF stable with ceramic output capacitors?
Yes, the LTC3405AES6#TRPBF is explicitly designed for stability with ceramic output capacitors - unlike many older regulators that require ESR-based compensation. Its current-mode control loop is independent of output capacitor ESR, enabling <10mVPP ripple with X5R/X7R ceramics and eliminating the reliability risks associated with tantalum capacitors.
LTC3405AES6#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
LTC3405AES6#TRPBF FAQ
1.How can I place an order for LTC3405AES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3405AES6#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#TRPBF reliable?
The price and inventory of LTC3405AES6#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3405AES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3405AES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3405AES6#TRPBF?
LTC3405AES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3405AES6#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#TRPBF?
For technical support, including LTC3405AES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3405AES6#TRPBF requirements.
6.How does Aetrix verify that LTC3405AES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3405AES6#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3405AES6#TRPBF?
All LTC3405AES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3405AES6#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3405AES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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