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Analog Devices Inc. LTC3105EMS#TRPBF
- Part No.:
- LTC3105EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 12-TSSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3105EMS#TRPBF.pdf
- Description:
- IC REG CONV ENERGY 1OUT 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:11,378
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Product details
Overview
LTC3105EMS#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-up DC/DC converter optimized for ultra-low-voltage, high-impedance energy harvesting sources. It features 250mV start-up voltage, integrated maximum power point control (MPPC), 400mA output current capability, 225mV–5V input range, and an auxiliary 6mA LDO regulator - enabling direct operation from single photovoltaic cells, thermoelectric generators, or fuel cells in battery/supercapacitor charging systems.
For engineers reviewing the LTC3105EMS#TRPBF datasheet, LTC3105EMS#TRPBF pinout, LTC3105EMS#TRPBF application, or LTC3105EMS#TRPBF equivalent, key selection considerations include MPPC programmability, VIN > VOUT operation support, Burst Mode® quiescent current (24µA), output disconnect with inrush limiting, and compatibility with 12-lead MSOP packaging for space-constrained industrial sensor nodes.
Technical Context
The LTC3105EMS#TRPBF implements a proprietary self-adjusting peak/valley current control architecture that dynamically scales inductor current limits (100mA–500mA) based on load demand while maintaining MPPC regulation. Its dual-stage start-up sequence first charges the AUX rail to ~1.4V before enabling main conversion, ensuring reliable boot from sub-300mV sources.
It integrates two independent regulation loops: one for the main boost output (programmable 1.6V–5.25V via FB divider) and another for the auxiliary LDO (1.4V–5V via FBLDO, default 2.2V). The MPPC circuit regulates average inductor current to hold VIN at a user-set threshold (e.g., 400mV), preventing source voltage collapse during maximum power extraction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-Up Voltage | 250mV - enables direct startup from single PV cell or TEG without external bias |
| Input Voltage Range | 225mV to 5V - supports wide-range ambient energy sources including low-VOC harvesters |
| Max Output Current | 400mA - sufficient for trickle-charging Li-ion, NiMH, or supercapacitors in remote sensors |
| Burst Mode IQ | 24µA - minimizes no-load power loss in intermittently active IoT endpoints |
| AUX LDO Output | 6mA @ 2.2V (default) - powers microcontrollers and sensors before main output reaches regulation |
| MPPC Set Point | User-programmable via resistor to GND - sets optimal input voltage operating point for specific harvester |
| Shutdown IQ | 10µA - preserves source energy during system sleep modes |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.9mm × 1.0mm), exposed pad (GND), RoHS-compliant, –40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Boost output feedback input | Connects to VOUT divider tap; sets regulated output voltage (1.6V–5.25V) via 1.004V reference |
| LDO (Pin 2) | Auxiliary LDO output | Provides regulated 6mA rail; requires ≥4.7µF ceramic capacitor to GND |
| FBLDO (Pin 3) | LDO feedback input | Configures LDO output voltage; tied to GND for internal 2.2V setting |
| SHDN (Pin 4) | Active-low shutdown control | Internal 2MΩ pull-up; open-drain compatible; must float during startup |
| MPPC (Pin 5) | Maximum Power Point Control set point | Resistor-to-GND programs MPPC threshold (e.g., 400mV = 40kΩ); short to GND disables MPPC |
| VIN (Pin 8) | Main input supply | Accepts 225mV–5V; requires ≥10µF low-ESR ceramic cap close to pin for high-Z sources |
| GND (Pins 6, 7) | Signal and power ground | Low-impedance PCB connection required; pins 6 & 7 are internal GND connections |
| SW (Pin 9) | Switch node | Drives external inductor; antiringing switch connects SW to VIN in sleep/shutdown |
| PGOOD (Pin 10) | Power good indicator | Open-drain output asserted when VOUT ≥90% of regulation; disabled in shutdown/startup |
| VOUT (Pin 11) | Main boost output | Synchronous rectifier drain; requires ≥10µF low-ESR capacitor; internally connects to AUX when VOUT > VAUX |
| AUX (Pin 12) | Auxiliary supply rail | Charged during startup; powers internal circuitry and LDO until VOUT regulation; 1µF cap required |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low start-up voltage | 250mV enables direct use with single photovoltaic cells and thermoelectric generators without auxiliary bias |
| Integrated MPPC loop | Programmable input voltage set point prevents source collapse and maximizes harvested energy per cycle |
| Output disconnect & inrush limiting | Prevents overloading high-impedance sources during startup by isolating VOUT from VIN until regulation |
| VIN > VOUT operation | Seamlessly maintains regulation when input exceeds output voltage, disabling synchronous rectifiers as needed |
| Antiringing control | Internal switch clamps SW to VIN during non-switching periods, reducing EMI in low-power sleep states |
Applications
| Solar Powered Battery Chargers | Energy Harvesting Sensor Nodes |
|---|---|
Use Scenario: Charging Li-ion or NiMH batteries from single-cell photovoltaic panels in remote environmental monitoring stations. IC Role / Device Role / Timing Role: Primary power management IC providing regulated 3.3V/4.2V output, MPPC tracking, and LDO-powered MCU interface. Use Value: 250mV start-up and 24µA Burst Mode IQ enable full-day operation even under partial shading or low-light conditions. | Use Scenario: Powering wireless sensor transmitters (e.g., Zigbee, BLE) using thermoelectric generators mounted on industrial heat exchangers. IC Role / Device Role / Timing Role: High-efficiency boost converter extracting maximum power from ΔT-driven TEGs while supplying stable 2.4V for supercapacitor storage. Use Value: Programmable MPPC adapts to varying thermal gradients, and output disconnect prevents TEG overload during cold-start. |
| Industrial Current Loop Sensors | Low-Power Remote Transmitters |
Use Scenario: Deriving local power from 4–20mA industrial current loops to run loop-powered temperature/pressure sensors. IC Role / Device Role / Timing Role: Ultra-low-voltage DC/DC converter powered by diode-drop voltage across loop shunt, delivering regulated 3.3V for signal conditioning. Use Value: 225mV minimum operating voltage allows operation with <300mV diode forward drop, preserving loop compliance voltage. | Use Scenario: Supplying 3.3V to LPWAN transmitters (e.g., LoRa, NB-IoT) in asset trackers powered by miniature fuel cells. IC Role / Device Role / Timing Role: Energy-harvesting PMIC managing variable fuel cell output, providing clean power with PGOOD signaling for host MCU sequencing. Use Value: 10µA shutdown IQ extends standby time between transmissions; PGOOD enables precise wake-up timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-voltage boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3108EMS#TRPBF | Higher start-up voltage (20mV lower, 230mV), includes integrated cold-start circuit and 3.3V/2.2V fixed outputs; no user-programmable MPPC | Better suited for multi-source harvesting (PV + TEG) with automatic source selection; less flexible for custom MPP tuning | Select LTC3108EMS#TRPBF when cold-start reliability from sub-250mV sources is critical and fixed outputs suffice |
| BQ25504RGTT | 200mV start-up, integrated battery management (charge termination, protection), but no auxiliary LDO; uses different MPPC algorithm (open-circuit voltage sampling) | Designed specifically for solar/battery systems; lacks standalone LDO for sensor powering; requires external LDO for MCU supply | Select BQ25504RGTT when battery charging safety features (overvoltage, thermal cutoff) are mandatory and auxiliary rail is provided externally |
Compared with LTC3108EMS#TRPBF and BQ25504RGTT, the LTC3105EMS#TRPBF offers superior MPPC programmability and an integrated 6mA LDO - making it ideal for custom energy harvesting designs requiring flexible source optimization and autonomous sensor powering without additional regulators.
Availability
LTC3105EMS#TRPBF is available at Aetrix Electronics and suitable for solar-powered battery chargers, energy harvesting sensor nodes, industrial current loop interfaces, and low-power remote transmitters requiring stable component supply across long production lifecycles.
Supply support for LTC3105EMS#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.
The LTC3105EMS#TRPBF belongs to Linear's Energy Harvesting PMIC product line, designed specifically for powering ultra-low-power electronics from ambient sources such as light, heat, and vibration - targeting maintenance-free, battery-less operation in industrial IoT and remote sensing.
FAQ
What is the minimum input voltage required for the LTC3105EMS#TRPBF to begin switching?
The LTC3105EMS#TRPBF has a guaranteed start-up voltage of 250mV under standard test conditions (200mΩ series resistance, MPPC enabled). It operates continuously down to 225mV once started. This enables direct use with single photovoltaic cells and thermoelectric generators where source impedance is high and open-circuit voltage is marginal. The actual start-up threshold may vary slightly with source impedance and temperature.
How does the MPPC function work in the LTC3105EMS#TRPBF, and how is it configured?
The MPPC in the LTC3105EMS#TRPBF regulates average inductor current to maintain VIN at a user-defined voltage set by a resistor from the MPPC pin to GND (VMPPC = 10µA × RMPPC). For example, a 40kΩ resistor sets VMPPC = 400mV. When VIN exceeds this value, inductor current increases to pull VIN down; when VIN falls below, current decreases to let VIN rise. This maximizes power extraction from high-impedance sources like PV cells without external controllers.
Can the LTC3105EMS#TRPBF operate when the input voltage exceeds the output voltage?
Yes, the LTC3105EMS#TRPBF supports VIN > VOUT operation. When VIN rises to or above the regulated VOUT level, the internal synchronous rectifiers are disabled and the converter operates in critical conduction mode using only the N-channel MOSFET. This ensures continuous regulation without latch-up or damage, though efficiency decreases compared to synchronous mode. The device automatically transitions between modes based on real-time voltage comparison.
What is the purpose of the AUX pin on the LTC3105EMS#TRPBF, and how should it be decoupled?
The AUX pin on the LTC3105EMS#TRPBF provides an auxiliary voltage rail used during startup to power internal circuitry before VOUT reaches regulation. It is charged from VIN through internal circuitry and connects to VOUT once VOUT exceeds VAUX. A 1µF ceramic capacitor must be placed between AUX and GND - larger values increase startup time and are discouraged. This rail also supplies the integrated 6mA LDO, enabling sensor/MCU power before main output stabilization.
Does the LTC3105EMS#TRPBF provide output disconnect, and why is it important for energy harvesting?
Yes, the LTC3105EMS#TRPBF provides output disconnect during startup and shutdown, isolating VOUT from VIN. This is critical for energy harvesting because high-impedance sources like photovoltaic cells and thermoelectric generators cannot supply large inrush currents. Without disconnect, attempting to charge output capacitance directly would collapse the source voltage, preventing successful startup. The LTC3105EMS#TRPBF limits inrush by charging AUX first, then VOUT only after regulation is established.
LTC3105EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, Energy Harvesting
- Voltage - Input:
- 0.23V ~ 5V
- Number of Outputs:
- 1
- Voltage - Output:
- 1.5V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP
LTC3105EMS#TRPBF FAQ
1.How can I place an order for LTC3105EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3105EMS#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 LTC3105EMS#TRPBF reliable?
The price and inventory of LTC3105EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3105EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3105EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3105EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3105EMS#TRPBF?
LTC3105EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3105EMS#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 LTC3105EMS#TRPBF?
For technical support, including LTC3105EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3105EMS#TRPBF requirements.
6.How does Aetrix verify that LTC3105EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3105EMS#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 LTC3105EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3105EMS#TRPBF?
All LTC3105EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3105EMS#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 LTC3105EMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC3105EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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