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Analog Devices Inc. LTC3406BES5-1.2#TRPBF
- Part No.:
- LTC3406BES5-1.2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC3406BES5-1.2#TRPBF.pdf
- Description:
- IC REG BUCK 1.2V 600MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,620
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Product details
Overview
LTC3406BES5-1.2 from Analog Devices (formerly Linear Technology) is a high-efficiency, monolithic synchronous step-down DC/DC regulator in a 5-lead TSOT-23 package. It delivers up to 600mA output current with 1.2V fixed output, operates from 2.5V to 5.5V input, achieves up to 96% efficiency, and uses constant-frequency (1.5MHz) current-mode control-ideal for single Li-Ion battery-powered portable electronics requiring low profile and low quiescent current.
For engineers reviewing the LTC3406BES5-1.2 datasheet, LTC3406BES5-1.2 pinout, LTC3406BES5-1.2 application, or LTC3406BES5-1.2 equivalent, key selection criteria include its 1.2V fixed output, 600mA load capability, 300µA no-load supply current, 1.5MHz switching frequency enabling compact 2.2µH inductors, and integrated P/N-channel MOSFETs eliminating external Schottky diodes.
Technical Context
The LTC3406BES5-1.2 employs a constant-frequency, peak-current-mode control architecture with internal P-channel main switch and N-channel synchronous rectifier. Its 1.5MHz oscillator enables use of small ceramic capacitors and sub-3mm inductors while maintaining stable regulation across line and load transients.
It features pulse-skipping mode at light loads to maintain regulation with low output ripple, overtemperature protection that disables both switches above ~150°C, and an internal 0.8V reference with ±0.4% line regulation and ±0.5% load regulation-ensuring tight 1.2V output accuracy (±3%) over temperature and input voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2V ±3% (1.164V–1.236V), internally trimmed for precision without external feedback resistors |
| Max Output Current | 600mA continuous, supported by internal 0.4Ω P-FET and 0.45Ω N-FET RDS(ON) at 25°C |
| Input Voltage Range | 2.5V to 5.5V - optimized for single-cell Li-ion (2.7V–4.2V) and USB-powered systems |
| Switching Frequency | 1.5MHz nominal (1.2–1.8MHz over temp/voltage), enabling <3mm inductors and low-profile designs |
| Quiescent Current | 300µA at no load; drops to <1µA in shutdown - extends battery runtime in standby |
| Efficiency Peak | Up to 96% at 3VIN/1.2VOUT/600mA - minimizes thermal stress in thin portable enclosures |
| Package | 5-lead TSOT-23 (ThinSOT), 1mm height - meets ultra-low-profile requirements for slim handhelds |
Pinout & Package
5-lead plastic TSOT-23 package (JEDEC MO-193), 1.00mm max height, 2.80mm × 1.60mm footprint. Exposed pad not present; thermal resistance θJA = 250°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable control input | Logic-high (>1.5V) enables regulation; logic-low (<0.3V) forces <1µA shutdown - used for system power sequencing |
| GND (Pin 2) | Power and signal ground reference | Common return for VIN, SW, VOUT, and internal circuitry - must be low-impedance connection to minimize noise |
| SW (Pin 3) | Switch node | Connection point between internal P-FET drain and N-FET source - routes high di/dt current to external inductor |
| VIN (Pin 4) | Main input supply | Accepts 2.5V–5.5V; requires local 4.7µF ceramic decoupling - powers internal gate drivers and bias circuits |
| VOUT (Pin 5) | Regulated output / feedback sense | Delivers 1.2V output; internal resistor divider (60k/120k) sets feedback ratio - no external resistors needed |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated N-channel MOSFET eliminates external Schottky diode - reduces BOM count and improves efficiency by ~5% vs asynchronous designs |
| 100% duty cycle operation | Enables dropout as low as VOUT + ILOAD×RDS(ON) - extends usable battery life down to 1.25V input in Li-ion systems |
| Pulse-skipping mode | Maintains regulation at light loads with low output ripple - avoids audible noise and preserves efficiency better than forced PWM at <10mA |
| Overtemperature protection | Thermal shutdown disables both switches above ~150°C junction - prevents permanent damage during overload or poor heatsinking |
| No external compensation required | Internally compensated for stability with standard 2.2µH inductor and 10µF ceramic output capacitor - simplifies layout and reduces design cycle time |
Applications
| Cellular Telephones | Digital Still Cameras |
|---|---|
Use Scenario: Powering baseband processor core voltage in ultra-thin smartphones operating from single Li-ion cell (2.7V–4.2V). IC Role / Device Role / Timing Role: Primary 1.2V/600mA synchronous buck regulator delivering regulated core supply with fast transient response. Use Value: 96% peak efficiency and 300µA quiescent current maximize talk time and standby duration in space-constrained PCB layouts. | Use Scenario: Supplying image sensor and ISP core voltage during burst capture mode with rapid load steps (0→600mA). IC Role / Device Role / Timing Role: High-bandwidth synchronous buck converter providing stable 1.2V rail with minimal output voltage deviation (<20mV) under 25µs load transients. Use Value: Current-mode control and 1.5MHz switching ensure clean, low-ripple power delivery critical for low-noise image capture. |
| Wireless Modems | Portable Instruments |
Use Scenario: Generating 1.2V supply for Wi-Fi/BT SoC in battery-powered IoT gateways with intermittent high-power transmission bursts. IC Role / Device Role / Timing Role: Efficient step-down regulator supporting dynamic power management via RUN pin control during sleep/wake cycles. Use Value: <1µA shutdown current and fast enable/disable (<10µs) reduce average system power consumption in duty-cycled applications. | Use Scenario: Powering microcontroller and analog front-end in handheld test equipment requiring stable 1.2V rail across wide temperature (-40°C to 85°C). IC Role / Device Role / Timing Role: Precision-regulated DC/DC converter with ±0.4%/V line regulation and ±0.5% load regulation ensuring measurement accuracy. Use Value: Tight output tolerance (±3%) and overtemperature protection guarantee reliable operation in unventilated enclosures. |
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 |
|---|---|---|---|
| LTC3406ES5-1.2#TRPBF | Same pinout and function, but rated for 0°C to 70°C commercial temp range (vs –40°C to 85°C industrial for LTC3406BES5-1.2) | Not suitable for extended-temperature industrial or automotive environments | Select LTC3406BES5-1.2 when operation beyond 70°C ambient is required |
| LTC3405AES5-1.2#TRPBF | 300mA output (vs 600mA), same 1.2V fixed output, 1.5MHz, 2.5V–5.5V input, but lower RDS(ON) and 20µA IQ | Lower current capability limits use to low-power MCU cores or sensors | Choose LTC3406BES5-1.2 when >400mA sustained load or higher transient current headroom is needed |
Compared with LTC3406ES5-1.2#TRPBF and LTC3405AES5-1.2#TRPBF, the LTC3406BES5-1.2 provides full industrial temperature support and double the output current, making it the only option among the three qualified for demanding portable instrumentation and extended-life consumer devices.
Availability
LTC3406BES5-1.2 is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, and portable instruments requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LTC3406BES5-1.2 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, manufacturing, and documentation for legacy Linear regulators including the LTC3406B series.
The LTC3406B family was designed specifically for ultra-compact, high-efficiency power conversion in battery-powered portable electronics - emphasizing low profile, low quiescent current, and integrated synchronous FETs to eliminate external diodes.
FAQ
What is the maximum recommended output current for the LTC3406BES5-1.2?
The LTC3406BES5-1.2 is specified for continuous 600mA output current at 3V input and 25°C ambient. Derating is required above 70°C ambient or with elevated input voltage due to thermal limits; at 85°C ambient and 5.5V input, maximum sustainable output current drops to approximately 400mA to maintain junction temperature below 125°C.
Does the LTC3406BES5-1.2 require external feedback resistors to set the output voltage?
No. The LTC3406BES5-1.2 has a factory-trimmed internal resistor divider that fixes the output voltage at 1.2V. Pin 5 (VOUT) serves as both output terminal and feedback node - no external resistors are needed, simplifying layout and reducing component count.
Can the LTC3406BES5-1.2 operate with input voltage lower than 2.5V?
No. The absolute minimum input voltage is 2.5V per datasheet specifications. Operation below 2.5V may cause regulation loss, erratic switching, or failure to start. For sub-2.5V inputs, consider the LTC3406ES5-0.6#TRPBF (0.6V output) or LTC3405AES5-0.8#TRPBF (0.8V output) variants.
What is the purpose of the RUN pin on the LTC3406BES5-1.2, and what voltage levels enable or disable it?
The RUN pin (Pin 1) controls device enable/disable. Applying ≥1.5V enables regulation; applying ≤0.3V places the LTC3406BES5-1.2 in shutdown mode drawing <1µA. Voltages between 0.3V and 1.5V are undefined and must be avoided - the pin must never be left floating.
Is the LTC3406BES5-1.2 RoHS compliant and lead-free?
Yes. The LTC3406BES5-1.2#TRPBF suffix denotes lead-free (Pb-free), RoHS-compliant packaging with matte tin finish on leads and halogen-free molding compound, meeting JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) requirements.
LTC3406BES5-1.2#TRPBF 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LTC3406BES5-1.2#TRPBF FAQ
1.How can I place an order for LTC3406BES5-1.2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3406BES5-1.2#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 LTC3406BES5-1.2#TRPBF reliable?
The price and inventory of LTC3406BES5-1.2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3406BES5-1.2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3406BES5-1.2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3406BES5-1.2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3406BES5-1.2#TRPBF?
LTC3406BES5-1.2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3406BES5-1.2#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 LTC3406BES5-1.2#TRPBF?
For technical support, including LTC3406BES5-1.2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3406BES5-1.2#TRPBF requirements.
6.How does Aetrix verify that LTC3406BES5-1.2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3406BES5-1.2#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 LTC3406BES5-1.2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3406BES5-1.2#TRPBF?
All LTC3406BES5-1.2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3406BES5-1.2#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 LTC3406BES5-1.2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3406BES5-1.2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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