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Analog Devices Inc. LTC3405AES6#TRMPBF
- Part No.:
- LTC3405AES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3405AES6#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,360
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Product details
Overview
LTC3405AES6#TRMPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter optimized for single Li-Ion battery-powered systems. It delivers up to 300mA output current across a 2.5V–5.5V input range, operates at a fixed 1.5MHz switching frequency, achieves up to 96% efficiency, and supports low dropout operation via 100% duty cycle - enabling extended runtime in portable instrumentation and digital cameras.
For engineers reviewing the LTC3405AES6#TRMPBF datasheet, LTC3405AES6#TRMPBF pinout, LTC3405AES6#TRMPBF application, or LTC3405AES6#TRMPBF equivalent, key selection criteria include its 20µA operating quiescent current, ±2% output voltage accuracy, internal P/N-channel MOSFETs eliminating external Schottky diodes, stable ceramic capacitor compatibility, and dual-mode operation (Burst Mode or pulse-skipping) selectable via MODE pin.
Technical Context
The LTC3405AES6#TRMPBF implements a constant-frequency, current-mode control architecture with integrated high-side P-channel and low-side N-channel synchronous power switches. Its peak-current sensing loop ensures fast line and load transient response, while internal slope compensation prevents subharmonic oscillation above 40% duty cycle without reducing maximum inductor peak current.
It features dual operating modes: Burst Mode (MODE = GND) for ultra-low quiescent current (20µA) at light loads, and pulse-skipping mode (MODE = VIN) for lower output ripple and reduced EMI. Overtemperature protection disables both switches above ~150°C, and short-circuit foldback reduces oscillator frequency to 210kHz to limit inductor current runaway.
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) with no brownout risk. |
| Output Current | 300mA max at VIN = 3V - sufficient for baseband processors, camera modules, and RF front-ends in handheld devices. |
| Switching Frequency | 1.5MHz (typ) - enables use of compact 2.2–4.7µH inductors and small ceramic capacitors for minimal PCB footprint. |
| Quiescent Current | 20µA during operation - preserves battery life in standby or sleep states of portable electronics. |
| Feedback Reference | 0.8V ±2% - allows precise regulation down to 0.8V output using standard resistor dividers; supports 1.2V, 1.3V, 1.5V, 1.8V, 2.5V, 3.3V configurations. |
| Efficiency | Up to 96% - achieved via synchronous rectification and low RDS(ON) (0.7Ω P-FET / 0.6Ω N-FET), minimizing conduction loss. |
| Duty Cycle | 100% - enables low-dropout operation when VIN approaches VOUT, critical for end-of-battery-life operation. |
| Shutdown Current | <1µA - ensures near-zero battery drain when system is powered off. |
Pinout & Package
Package: TSOT-23-6 (ThinSOT™), 1mm profile, RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable control input | Logic-high (>1.5V) enables regulator; logic-low (<0.3V) forces shutdown with <1µA supply current - must not be left floating. |
| GND (Pin 2) | Power and signal reference | Primary ground return for IC core, power switches, and feedback amplifier - requires low-inductance connection to power plane. |
| SW (Pin 3) | Switch node | Connection point between internal P-FET drain and N-FET drain - carries high di/dt square-wave current; must be routed short and wide. |
| VIN (Pin 4) | Main power input | Supplies both control circuitry and power switches - requires local 2.2µF ceramic decoupling directly to GND (Pin 2). |
| VFB (Pin 5) | Feedback input | Monitors resistive divider output; error amplifier compares to 0.8V reference - sensitive analog node; keep away from SW and high-current traces. |
| MODE (Pin 6) | Operating mode select | GND selects Burst Mode (low IQ); VIN or >1.5V selects pulse-skipping mode (lower ripple) - must not be left floating. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, increasing efficiency by ~5–10% and reducing thermal stress in compact layouts. |
| Ceramic capacitor stability | No ESR dependency in control loop - enables use of low-ESR, high-RMS ceramic caps for <10mVpp output ripple and smaller total solution size. |
| 100% duty cycle operation | Maintains regulation even when VIN drops to within ~100mV of VOUT - extends usable battery capacity in portable systems. |
| Two selectable light-load modes | Burst Mode (20µA IQ) for max battery life; pulse-skipping for audio-sensitive applications requiring low ripple and minimal EMI. |
| Overtemperature protection | Thermal shutdown at ~150°C junction temperature - prevents damage during sustained overload or poor heatsinking. |
| Short-circuit foldback | Oscillator frequency drops to 210kHz under output short - limits peak inductor current and prevents thermal runaway. |
Applications
| Cellular Telephones | Digital Still Cameras |
|---|---|
Use Scenario: Powering baseband processor and memory subsystem from single Li-Ion cell during active call and standby. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.8V/300mA with fast load transient response to handle burst data transmission. Use Value: 96% efficiency and 20µA quiescent current extend talk time and standby duration; 100% duty cycle sustains operation down to 2.7V battery voltage. | Use Scenario: Supplying image sensor and ISP core in compact digital camera with strict size and thermal constraints. IC Role / Device Role / Timing Role: High-frequency (1.5MHz) synchronous buck providing 1.2V/250mA with minimal board area and low noise. Use Value: TSOT-23-6 package and ceramic-capacitor compatibility enable <25mm² total solution size; Burst Mode maintains <25µA system sleep current. |
| Wireless Modems | Portable Instruments |
Use Scenario: Regulating power for Wi-Fi/Bluetooth SoC in battery-operated IoT gateway with intermittent connectivity. IC Role / Device Role / Timing Role: Efficient 3.3V/300mA supply with MODE-selectable operation to balance RF noise and battery longevity. Use Value: Pulse-skipping mode minimizes conducted EMI near 2.4GHz band; 1.5MHz switching avoids sensitive IF frequencies. | Use Scenario: Powering microcontroller, ADC, and display driver in handheld multimeter or environmental sensor. IC Role / Device Role / Timing Role: Single-chip buck converter delivering 2.5V/200mA with high line/load regulation (±0.5%) for precision analog front-end stability. Use Value: ±2% output accuracy and low load regulation ensure consistent ADC reference and sensor biasing across battery discharge cycle. |
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 | Fixed 1.8V output; 3MHz switching; 2.05–6.5V input; 400mA IOUT; 17µA IQ | Not adjustable - requires redesign if non-1.8V output needed; higher fSW demands tighter layout but allows smaller L/C. | Select when fixed 1.8V output suffices and board space is extremely constrained. |
| MAX17222ETA+T | Adjustable 0.6–5.5V; 2MHz fSW; 2.5–5.5V input; 300mA IOUT; 1.6µA shutdown, 25µA IQ | Higher quiescent current; no 100% duty cycle; uses external diode - lower efficiency and larger solution size. | Select only if Burst Mode timing or thermal shutdown behavior is less critical than cost. |
Compared with TPS62231DRVR and MAX17222ETA+T, the LTC3405AES6#TRMPBF offers unique 100% duty cycle capability for Li-Ion end-of-discharge support, lower typical IQ in Burst Mode (20µA vs 25µA), and integrated synchronous switches - making it superior for battery runtime-critical portable instrumentation and imaging applications.
Availability
LTC3405AES6#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, wireless modems, and portable instruments requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC3405AES6#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3405AES6#TRMPBF belongs to ADI's legacy Linear Technology µPower synchronous buck regulator family, designed specifically for ultra-low-power, space-constrained portable electronics powered by single-cell Li-Ion batteries.
FAQ
What is the maximum output current capability of the LTC3405AES6#TRMPBF?
The LTC3405AES6#TRMPBF delivers up to 300mA output current when VIN = 3V. Maximum output current decreases at lower input voltages - e.g., ~250mA at VIN = 2.7V for VOUT = 1.8V - due to increased RDS(ON) and reduced duty-cycle headroom. The datasheet provides detailed derating curves in Figure 2.
Does the LTC3405AES6#TRMPBF require an external Schottky diode?
No, the LTC3405AES6#TRMPBF does not require an external Schottky diode. It integrates both a P-channel high-side and N-channel low-side MOSFET in a synchronous buck topology, eliminating conduction losses and heat generation associated with external diodes - a key factor in its 96% peak efficiency.
How is the output voltage set on the LTC3405AES6#TRMPBF?
The output voltage of the LTC3405AES6#TRMPBF is set externally using a resistive divider connected between VOUT and GND, with the midpoint fed into the VFB pin. The formula is VOUT = 0.8V × (1 + R1/R2). For example, R1 = 412kΩ and R2 = 87kΩ yields VOUT = 2.5V. The 0.8V reference enables outputs as low as 0.8V.
What are the two operating modes of the LTC3405AES6#TRMPBF and how are they selected?
The LTC3405AES6#TRMPBF supports Burst Mode (ultra-low IQ) and pulse-skipping mode (lower ripple). MODE pin state determines operation: tie MODE to GND for Burst Mode (20µA IQ); tie MODE to VIN or apply >1.5V for pulse-skipping. Leaving MODE floating is prohibited and may cause erratic behavior.
Is the LTC3405AES6#TRMPBF stable with ceramic output capacitors?
Yes, the LTC3405AES6#TRMPBF 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 low-ripple, compact designs using X5R/X7R ceramics as small as 4.7µF.
LTC3405AES6#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC3405AES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3405AES6#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 LTC3405AES6#TRMPBF reliable?
The price and inventory of LTC3405AES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3405AES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3405AES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3405AES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3405AES6#TRMPBF?
LTC3405AES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3405AES6#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 LTC3405AES6#TRMPBF?
For technical support, including LTC3405AES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3405AES6#TRMPBF requirements.
6.How does Aetrix verify that LTC3405AES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3405AES6#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 LTC3405AES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3405AES6#TRMPBF?
All LTC3405AES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3405AES6#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 LTC3405AES6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3405AES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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