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Analog Devices Inc. LTC3108EDE#TRPBF
- Part No.:
- LTC3108EDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3108EDE#TRPBF.pdf
- Description:
- IC DCDC CONV STP-UP LV 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,174
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Product details
Overview
LTC3108EDE#TRPBF from Analog Devices is an ultralow-voltage step-up DC/DC converter and power manager designed for energy harvesting from thermoelectric generators (TEGs), thermopiles, and micro-solar cells. It starts up from as low as 20mV input, delivers four selectable regulated main outputs (2.35V/3.3V/4.1V/5V), integrates a 2.2V/3mA LDO, and supports storage capacitor backup-enabling self-powered wireless sensor nodes in HVAC, industrial monitoring, and predictive maintenance systems.
For engineers reviewing the LTC3108EDE#TRPBF datasheet, LTC3108EDE#TRPBF pinout, LTC3108EDE#TRPBF application, or LTC3108EDE#TRPBF equivalent, key selection criteria include minimum startup voltage (20mV), VOUT programmability via VS1/VS2 logic pins, PGOOD signaling, VOUT2 enable-controlled switching output, and thermal performance in the 3mm × 4mm DFN package with exposed pad.
Technical Context
The LTC3108EDE#TRPBF employs a resonant step-up oscillator driving an external transformer (e.g., 1:100 turns ratio) to boost sub-50mV inputs; its internal rectifier and charge pump feed VAUX, which powers all circuitry and enables VOUT charging above 2.5V. A precision micropower voltage reference activates at VAUX > 2V, ensuring stable regulation across temperature.
VOUT is programmed by VS1/VS2 logic levels to 2.35V, 3.3V, 4.1V, or 5V; VOUT2 is a host-enabled 1.3Ω P-channel switch output with 0.3A current limit and 5µs soft-start; PGD provides open-drain power-good indication with ±7.5%/±9% hysteresis thresholds relative to VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Startup Voltage | 20mV min - enables operation from tiny ΔT across TEGs (e.g., 1°C differential) |
| Main Output (VOUT) | 2.35V / 3.3V / 4.1V / 5V - user-selectable via VS1/VS2 logic pins; no external resistors needed |
| LDO Output | 2.2V @ 3mA - powers low-power MCUs or sensors; stable with ≥2.2µF ceramic capacitor |
| VOUT2 Switch | 1.3Ω P-MOSFET - enables host-controlled burst powering of sensors/transceivers; 0.3A peak limit |
| Quiescent Current | 3µA no-load input - minimizes energy drain during long sleep intervals between sensor transmissions |
| Package | 12-lead 3mm × 4mm DFN - thermally enhanced with exposed GND pad (θJA = 43°C/W) |
| Operating Temp | –40°C to 125°C - qualified for industrial and harsh-environment deployments |
Pinout & Package
Package: 12-lead (3mm × 4mm) plastic DFN with exposed thermal pad (Pin 13), soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 12) | N-Channel MOSFET Drain | Connects to primary winding of step-up transformer; switches at 10–100kHz resonance |
| C1 (Pin 10) | Charge Pump Input | AC-coupled to transformer secondary; feeds internal rectifier to generate VAUX |
| C2 (Pin 11) | N-Channel Gate Drive Input | Drives gate of internal N-MOSFET; requires coupling capacitor to transformer secondary |
| VOUT2_EN (Pin 9) | Logic Enable Input | Active-high (1V threshold); internal 5MΩ pull-down; controls VOUT2 switch activation |
| VS1 / VS2 (Pins 8, 7) | VOUT Programming Inputs | Binary-select main output voltage per Table 1; tied to GND or VAUX (not floating) |
| VOUT (Pin 3) | Main Regulated Output | Charged from VAUX; supplies wireless transmitters or sensor arrays via storage capacitor |
| VLDO (Pin 5) | 2.2V LDO Output | Powers microcontrollers; sourced from higher of VAUX or VOUT; requires ≥2.2µF bypass |
| PGD (Pin 6) | Open-Drain Power-Good | Pulled up to VLDO via 1MΩ; asserts high when VOUT within ±7.5% of target |
| VSTORE (Pin 2) | Storage Capacitor Output | Charges after VOUT regulation; powers system during input dropout; trickle-charges batteries |
| VAUX (Pin 1) | Internal Rectifier Output / IC Supply | Bypass with ≥1µF; clamped at 5.25V; enables VOUT charging once >2.5V |
| GND (Pins 1, 4, 8, 9 + Exposed Pad) | Ground Reference | Multiple GND connections; exposed pad must be soldered for thermal and electrical performance |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow startup voltage | 20mV enables energy harvesting from <1°C ΔT across TEGs - no battery or supercapacitor precharge required |
| Integrated multi-rail power management | Single chip delivers VOUT (4 fixed options), VLDO (2.2V), VOUT2 (switched), VSTORE (backup), and PGD - eliminates discrete PMIC complexity |
| Transformer-based topology | Uses compact off-the-shelf 1:20–1:100 step-up transformers - avoids inductor saturation issues common in boost converters at ultra-low VIN |
| Intelligent output sequencing | VAUX → VLDO → VOUT → VSTORE power-up order ensures safe MCU boot and prevents brownout during capacitor charging |
| Short-circuit protected outputs | All outputs (VOUT, VOUT2, VLDO, VSTORE) feature current limiting - protects against sensor faults or wiring shorts in unattended deployments |
Applications
| Industrial Wireless Sensing | Building Automation |
|---|---|
|
Use Scenario: Temperature, humidity, and vibration sensors deployed on rotating machinery or steam pipes without wiring or battery replacement. IC Role / Device Role / Timing Role: LTC3108EDE#TRPBF harvests waste heat via TEG to autonomously power sensor acquisition and LoRaWAN transmission bursts. Use Value: Enables 10+ year maintenance-free operation using only ambient thermal gradients; eliminates battery logistics and disposal costs. |
Use Scenario: Occupancy and CO₂ sensors embedded in HVAC ducts or ceiling tiles across commercial buildings. IC Role / Device Role / Timing Role: LTC3108EDE#TRPBF manages energy from small thermopiles or indoor light cells to power periodic air quality sampling and Zigbee reporting. Use Value: Reduces installation cost by eliminating conduit runs; supports dense sensor grids without battery inventory overhead. |
| Predictive Maintenance | Automatic Metering |
|
Use Scenario: Vibration and acoustic emission sensors on motors, pumps, and compressors in remote industrial sites. IC Role / Device Role / Timing Role: LTC3108EDE#TRPBF accumulates energy from machine surface heat to power FFT-based analytics and NB-IoT alerts during scheduled wake windows. Use Value: Delivers condition-based maintenance data without scheduled site visits; extends equipment lifetime via early fault detection. |
Use Scenario: Smart water/gas meters installed in underground utility boxes with minimal ambient light or thermal gradient. IC Role / Device Role / Timing Role: LTC3108EDE#TRPBF harvests micro-energy from thermopile outputs (e.g., Honeywell CQ200) to power hourly pulse counting and LTE-M uploads. Use Value: Achieves >15-year field life with zero battery swaps; meets ANSI C12.19 and DLMS/COSEM compliance via stable 3.3V VOUT rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultralow-voltage energy harvesting power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17710G+T | Requires ≥80mV startup; uses integrated rechargeable thin-film battery management; no VOUT2 switch or PGOOD | Better suited for photovoltaic indoor light harvesting; less effective for sub-50mV TEG sources | Select MAX17710G+T only if input source consistently exceeds 80mV and integrated battery charging is preferred over external capacitor storage. |
| BQ25504RGTT | 200mV min startup; includes MPPT for solar cells; lacks LDO and VOUT2; VOUT programmable only via external resistor divider | Optimized for indoor PV cells; not recommended for TEGs below 200mV open-circuit voltage | Choose BQ25504RGTT when harvesting from amorphous silicon or dye-sensitized solar cells where MPPT adds >15% efficiency gain. |
Compared with MAX17710G+T and BQ25504RGTT, the LTC3108EDE#TRPBF uniquely supports 20mV startup, integrated LDO, logic-controlled VOUT2 switching, and PGOOD signaling - making it the only option for reliable autonomous operation from low-ΔT thermoelectric sources in industrial edge nodes.
Availability
LTC3108EDE#TRPBF is available at Aetrix Electronics and suitable for industrial wireless sensing, building automation, and predictive maintenance applications requiring stable component supply, long-lifecycle assurance, and traceable sourcing for ISO 9001-certified production.
Supply support for LTC3108EDE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and RF solutions.
The LTC3108EDE#TRPBF belongs to Analog Devices' Energy Harvesting Power Management product line, engineered specifically to enable battery-free, maintenance-free operation of ultra-low-power IoT endpoints using ambient thermal, light, or mechanical energy sources.
FAQ
What is the minimum input voltage required for LTC3108EDE#TRPBF to start up?
The LTC3108EDE#TRPBF has a guaranteed minimum startup voltage of 20mV when using a 1:100 transformer turns ratio. This allows it to operate from thermoelectric generators with temperature differentials as low as 1°C. Startup voltage increases with lower transformer ratios (e.g., 1:50 or 1:20), so design validation must match the selected transformer to the expected input source characteristics. The LTC3108EDE#TRPBF datasheet specifies this under "Minimum Start-Up Voltage" in the Electrical Characteristics table.
How is the main output voltage (VOUT) configured on the LTC3108EDE#TRPBF?
The LTC3108EDE#TRPBF provides four fixed VOUT options-2.35V, 3.3V, 4.1V, or 5V-selected by connecting VS1 and VS2 pins to GND or VAUX according to Table 1 in the datasheet. No external resistors or programming interfaces are needed. The internal programmable resistor divider ensures accurate regulation across temperature, and the logic thresholds (0.4V to 1.2V) make direct connection to VAUX or GND robust and noise-immune. This configuration is finalized at power-up and remains static until reset.
Does the LTC3108EDE#TRPBF include built-in protection features?
Yes, the LTC3108EDE#TRPBF integrates short-circuit protection on all outputs: VOUT, VOUT2, VLDO, and VSTORE each have current limiting (e.g., 4.5mA typical for VOUT, 0.3A for VOUT2). It also features overvoltage clamping on VAUX (5.25V typical), thermal shutdown at TJ = 125°C, and input undervoltage lockout. These protections operate autonomously without external components, ensuring reliability in unattended energy harvesting deployments where fault conditions may persist for extended periods.
Can the LTC3108EDE#TRPBF power a microcontroller directly?
Yes, the LTC3108EDE#TRPBF includes a dedicated 2.2V low-dropout linear regulator (VLDO) capable of delivering up to 3mA, designed explicitly to power ultra-low-power microcontrollers such as the Silicon Labs EFM32 or STMicroelectronics STM32L0 series. The VLDO is powered from the higher of VAUX or VOUT, enabling early MCU wake-up before VOUT reaches full regulation. A minimum 2.2µF ceramic capacitor on VLDO ensures stability, and the LDO's 100mV dropout at 2mA load supports operation even as VAUX sags during transient loads.
What is the purpose of the VOUT2 output on the LTC3108EDE#TRPBF?
The VOUT2 output on the LTC3108EDE#TRPBF is a host-controlled switched rail that connects to VOUT through an internal 1.3Ω P-channel MOSFET when VOUT2_EN is driven high. It enables precise temporal control of peripheral power-such as analog sensors, op-amps, or RF front-ends-reducing system-wide quiescent current. With 5µs soft-start and 0.3A current limiting, VOUT2 minimizes inrush and supports burst-mode operation critical for energy-constrained wireless sensor nodes. Its logic-compatible enable threshold (1V) simplifies interface with standard GPIOs.
LTC3108EDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Energy Harvesting
- Current - Supply:
- 3mA
- Voltage - Supply:
- 20mV ~ 500mV
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3108EDE#TRPBF FAQ
1.How can I place an order for LTC3108EDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3108EDE#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 LTC3108EDE#TRPBF reliable?
The price and inventory of LTC3108EDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3108EDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3108EDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3108EDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3108EDE#TRPBF?
LTC3108EDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3108EDE#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 LTC3108EDE#TRPBF?
For technical support, including LTC3108EDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3108EDE#TRPBF requirements.
6.How does Aetrix verify that LTC3108EDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3108EDE#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 LTC3108EDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3108EDE#TRPBF?
All LTC3108EDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3108EDE#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 LTC3108EDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3108EDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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