My Inquiry
My Account
Analog Devices Inc. LTC3405AES6-1.8#TRPBF
- Part No.:
- LTC3405AES6-1.8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3405AES6-1.8#TRPBF.pdf
- Description:
- IC REG BUCK 1.8V 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,048
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3405AES6-1.8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator in TSOT-23-6 package, delivering 300mA at fixed 1.8V output from 2.5V–5.5V input. It features 1.5MHz constant-frequency current-mode control, 93% peak efficiency, 20µA operating quiescent current, and 100% duty-cycle low-dropout operation-enabling extended battery life in single Li-ion portable systems.
For engineers reviewing the LTC3405AES6-1.8#TRPBF datasheet, LTC3405AES6-1.8#TRPBF pinout, LTC3405AES6-1.8#TRPBF application, or LTC3405AES6-1.8#TRPBF equivalent, key selection criteria include its Burst Mode™ vs pulse-skipping mode behavior, RDS(ON) of internal P/N-channel switches (0.85Ω / 0.90Ω typ), ±3% output voltage accuracy, thermal shutdown protection, and ceramic-capacitor stability without external diode.
Technical Context
The LTC3405AES6-1.8#TRPBF employs a constant-frequency, current-mode architecture with internal P-channel main switch (RDS(ON) = 0.85Ω typ) and N-channel synchronous rectifier (RDS(ON) = 0.90Ω typ), enabling high efficiency across load range. Its error amplifier compares VFB against 1.2V reference to regulate output via peak-current control, with slope compensation active above 40% duty cycle.
Mode selection is hardware-configured: MODE pin grounded enables Burst Mode™ (20µA IQ, intermittent switching), while tied to VIN enables pulse-skipping mode (lower ripple, higher light-load IQ). RUN pin controls enable/disable with 0.3V/1.5V thresholds, and overvoltage lockout triggers at +7.8% VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% - eliminates external feedback resistors; supports precision 1.8V logic rails. |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion (2.7V–4.2V) and USB-powered systems. |
| Max Output Current | 300mA at VIN ≥ 3V - sufficient for baseband processors, RF transceivers, and sensor interfaces. |
| Switching Frequency | 1.5MHz (typ) - enables use of compact 2.2µH–4.7µH inductors and reduces EMI filtering burden. |
| Quiescent Current | 20µA in Burst Mode™ - extends battery runtime in standby/sleep states of portable devices. |
| Shutdown Current | <1µA - ensures near-zero drain during system power-off or deep sleep. |
| Efficiency Peak | 93% at 300mA, VIN = 3.6V - minimizes thermal rise and power loss in space-constrained PCBs. |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant. Pin 1 marked with dot; pin 1–6 arranged counterclockwise from top-left corner when viewed from top with marking dot upper-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable control input | Logic-high (>1.5V) enables regulation; logic-low (<0.3V) forces shutdown (<1µA IQ); must not float. |
| GND (Pin 2) | Power ground reference | Primary return path for IC core, switches, and feedback; requires low-impedance connection to power plane. |
| SW (Pin 3) | Switch node | Drain connection of internal P- and N-channel MOSFETs; routes high dv/dt switching waveform to external inductor. |
| VIN (Pin 4) | Main input supply | Connects to input capacitor (≥2.2µF ceramic); supplies gate drive and bias current; absolute max = 6V. |
| VOUT (Pin 5) | Regulated output feedback | Internally divided 1.8V output; no external resistor required; connects directly to output capacitor. |
| MODE (Pin 6) | Operating mode select | GND = Burst Mode™ (ultra-low IQ); VIN = pulse-skipping mode (lower ripple, higher light-load IQ). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, increasing efficiency by ~5–10% and reducing BOM count and board area. |
| Ceramic-capacitor stability | No ESR dependency in control loop - enables use of low-ESR, small-footprint X5R/X7R ceramics for <10mVPP ripple. |
| 100% duty-cycle operation | Maintains regulation down to VIN ≈ VOUT - critical for Li-ion end-of-discharge (e.g., 2.7V → 1.8V) without dropout failure. |
| Overtemperature protection | Thermal shutdown at ~150°C junction temperature - prevents damage during overload or poor heatsinking. |
| Overvoltage lockout | Disables switching if VOUT exceeds +7.8% nominal - protects downstream 1.8V logic from transient overvoltage. |
Applications
| Cellular Baseband Power | Digital Camera Sensor Bias |
|---|---|
Use Scenario: Powering ARM-based baseband processor cores requiring stable 1.8V rail during burst data transmission and deep-sleep modes. IC Role / Device Role / Timing Role: Primary step-down regulator supplying core logic voltage with fast load transient response and ultra-low IQ in idle. Use Value: Extends talk time by >25% versus non-Burst Mode regulators due to 20µA quiescent current at 2mA load. |
Use Scenario: Providing clean, low-noise 1.8V bias to CMOS image sensor I/O and analog front-end during preview and capture. IC Role / Device Role / Timing Role: Fixed-output buck converter with low output ripple (<15mVPP) and minimal conducted EMI. Use Value: Enables artifact-free imaging by suppressing switching noise coupling into sensitive analog pixel circuitry. |
| Wireless Modem RFIC Supply | Portable Medical Sensor Node |
Use Scenario: Delivering regulated 1.8V to Bluetooth/Wi-Fi RF transceiver ICs with dynamic current demand from 100µA to 250mA. IC Role / Device Role / Timing Role: High-efficiency DC/DC stage supporting both continuous TX/RX and low-power listen modes. Use Value: Achieves >88% efficiency at 10mA load (Burst Mode™), minimizing self-heating near temperature-sensitive RF components. |
Use Scenario: Powering ultra-low-power microcontroller, biosensor ADC, and BLE radio in wearable health monitors running on coin-cell or Li-ion. IC Role / Device Role / Timing Role: Single-chip 1.8V regulator enabling full-system operation from 2.7V–4.2V battery with <1µA shutdown leakage. Use Value: Supports multi-year battery life via sub-µA shutdown and 20µA active IQ, validated per ISO 13485 design requirements. |
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, 300mA, 3MHz switching frequency; 17µA IQ; requires external soft-start capacitor. | Better light-load efficiency above 10mA but higher EMI due to 3MHz operation; less tolerant of low-ESR ceramic caps. | Prefer for space-constrained designs needing faster transient response; verify layout EMI filtering for RF-sensitive systems. |
| MAX8640YETA+T | Fixed 1.8V, 600mA, 2.25MHz; 25µA IQ; integrated soft-start and power-good; wider input (2.6V–5.5V). | Higher current capability and built-in PG signal, but larger 2mm × 2mm TDFN package and no 100% duty cycle. | Choose when future-proofing for higher loads or requiring power-good monitoring; avoid where dropout below 2.7V is critical. |
Compared with TPS62231DRVR and MAX8640YETA+T, the LTC3405AES6-1.8#TRPBF offers superior low-input-voltage operation (2.5V min), true 100% duty cycle, and proven ceramic-capacitor stability - making it optimal for legacy Li-ion systems prioritizing battery longevity over raw speed or feature count.
Availability
LTC3405AES6-1.8#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, wireless modems, and portable medical instruments requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3405AES6-1.8#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3405AES6-1.8#TRPBF belongs to ADI's LTC® monolithic DC/DC regulator family, engineered specifically for ultra-low-power portable electronics where battery life, small footprint, and ceramic-capacitor compatibility are primary design constraints.
FAQ
What is the maximum input voltage rating for the LTC3405AES6-1.8#TRPBF?
The LTC3405AES6-1.8#TRPBF has an absolute maximum input voltage rating of 6V. Operation beyond this limit risks permanent damage. The recommended operating range is 2.5V to 5.5V, aligning with single-cell Li-ion and USB power sources. Exceeding 6V-even briefly-can degrade internal MOSFETs and compromise reliability.
Does the LTC3405AES6-1.8#TRPBF require an external Schottky diode?
No, the LTC3405AES6-1.8#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 heat generation associated with external diodes. This integration improves efficiency by up to 10% and reduces solution size.
How does Burst Mode™ operation affect output voltage ripple on the LTC3405AES6-1.8#TRPBF?
In Burst Mode™ (MODE = GND), the LTC3405AES6-1.8#TRPBF delivers energy in short bursts followed by sleep intervals, resulting in higher peak-to-peak output ripple (typically 20–40mVPP) compared to pulse-skipping mode. However, this trade-off enables 20µA quiescent current, making it ideal for battery-critical standby operation where ripple is filtered by downstream LDOs or capacitors.
Can the LTC3405AES6-1.8#TRPBF operate with input voltage equal to output voltage?
Yes, the LTC3405AES6-1.8#TRPBF supports 100% duty-cycle operation, allowing it to maintain regulation even when VIN drops to VOUT (1.8V). This feature is essential for maximizing usable capacity from Li-ion batteries discharging down to 2.7V, extending runtime in portable applications without requiring backup LDOs.
What is the thermal resistance (θJA) of the LTC3405AES6-1.8#TRPBF in its TSOT-23-6 package?
The LTC3405AES6-1.8#TRPBF in the TSOT-23-6 (S6) package has a specified junction-to-ambient thermal resistance (θJA) of 250°C/W under standard JEDEC test conditions. Actual θJA depends on PCB copper area and airflow; adding thermal vias under the exposed pad (if present) or using 1-in² 2-oz copper can reduce θJA to ~120°C/W.
LTC3405AES6-1.8#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:
- 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:
- 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
LTC3405AES6-1.8#TRPBF FAQ
1.How can I place an order for LTC3405AES6-1.8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3405AES6-1.8#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 LTC3405AES6-1.8#TRPBF reliable?
The price and inventory of LTC3405AES6-1.8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3405AES6-1.8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3405AES6-1.8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3405AES6-1.8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3405AES6-1.8#TRPBF?
LTC3405AES6-1.8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3405AES6-1.8#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 LTC3405AES6-1.8#TRPBF?
For technical support, including LTC3405AES6-1.8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3405AES6-1.8#TRPBF requirements.
6.How does Aetrix verify that LTC3405AES6-1.8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3405AES6-1.8#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 LTC3405AES6-1.8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3405AES6-1.8#TRPBF?
All LTC3405AES6-1.8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3405AES6-1.8#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 LTC3405AES6-1.8#TRPBF part is unused and in its original packaging.
Return procedure for LTC3405AES6-1.8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3405AES6-1.8#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
