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Analog Devices Inc. LTC3108EGN#TRPBF
- Part No.:
- LTC3108EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3108EGN#TRPBF.pdf
- Description:
- IC DCDC CONV STP-UP LV 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,156
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Product details
Overview
LTC3108EGN#TRPBF from Analog Devices is an ultralow-voltage step-up converter and power manager IC designed for energy harvesting from thermoelectric generators (TEGs), thermopiles, and micro-solar cells. It operates from input voltages as low as 20mV, delivers four selectable regulated main outputs (2.35V/3.3V/4.1V/5V), integrates a 2.2V/3mA LDO, and supports storage capacitor backup via VSTORE - enabling autonomous wireless sensor nodes in HVAC, industrial monitoring, and predictive maintenance systems.
For engineers reviewing the LTC3108EGN#TRPBF datasheet, LTC3108EGN#TRPBF pinout, LTC3108EGN#TRPBF application, or LTC3108EGN#TRPBF equivalent, this page provides verified technical context, exact pin functions per SSOP-16 package, confirmed startup behavior at 20mV, real-world efficiency curves across transformer ratios, and two validated alternative parts with documented functional trade-offs.
Technical Context
The LTC3108EGN#TRPBF uses a resonant step-up oscillator driven by an external transformer (e.g., 1:100 turns ratio) to boost sub-50mV inputs; its internal N-channel MOSFET (0.5Ω RDS(on)) and synchronous rectifiers activate once VAUX exceeds 2V. The device implements voltage sequencing where VAUX charges first (clamped at 5.25V), enabling VOUT charging only after VAUX > 2.5V, followed by VLDO (2.2V) and VSTORE.
Four fixed VOUT options are selected via VS1/VS2 logic pins tied to GND or VAUX; PGOOD monitors VOUT within ±7.5% regulation window and asserts open-drain PGD high; VOUT2 is a host-enabled switched output (1.3Ω P-MOSFET, 0.3A peak) with 5µs soft-start and 350ns current-limit response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Min Start-Up Voltage | 20mV - enables operation directly from small ΔT across TEGs (e.g., 1°C differential on 30mm² module) |
| VOUT Options | 2.35V / 3.3V / 4.1V / 5V - selected by VS1/VS2 logic; eliminates need for external feedback resistors |
| LDO Output | 2.2V @ 3mA - powers ultra-low-power MCUs independently of main VOUT charge state |
| VOUT Quiescent Current | 0.2µA @ 3.3V - minimizes reservoir capacitor discharge during long sleep intervals |
| VOUT2 Switch RON | 1.3Ω - limits voltage drop under 100mA loads; enables efficient burst powering of sensors |
| PGOOD Threshold | ±7.5% rising / −9% falling - provides reliable enable signal for MCU wake-up without false triggers |
| VSTORE Leakage | 0.1–0.3µA @ 5V - preserves charge in supercapacitors during multi-day offline periods |
Pinout & Package
The LTC3108EGN#TRPBF is housed in a 16-lead plastic SSOP (narrow) package measuring 4.9mm × 3.9mm × 1.5mm, with exposed thermal pad not present (unlike DFN variant). All ground pins (1, 8, 9, 16) must be connected to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Ground reference | Four dedicated ground connections ensure low-impedance return paths for switching, LDO, and logic circuits |
| VAUX (2) | Internal rectifier output & IC supply | Bypassed with ≥1µF capacitor; clamped at 5.25V to power internal circuitry before VOUT regulation |
| VSTORE (3) | Storage capacitor charger | Charges supercapacitor/battery up to VAUX voltage after VOUT regulation; supplies system when input fails |
| VOUT (4) | Main regulated output | Programmed to 2.35V/3.3V/4.1V/5V via VS1/VS2; current-limited to 4.5mA typical for reservoir charging |
| VOUT2 (5) | Host-controlled switched output | Enabled by VOUT2_EN; connects to VOUT via 1.3Ω P-MOSFET; 0.3A peak current limit protects external loads |
| VLDO (6) | 2.2V linear regulator output | Stable 2.2V supply for µPs/sensors; requires ≥2.2µF ceramic capacitor; draws from VAUX or VOUT |
| PGD (7) | Power-good indicator | Open-drain output pulled up to VLDO; signals VOUT regulation status to MCU I/O with 1MΩ internal pull-up |
| VS2 (10) | VOUT select input | Logic input (0.4–1.2V threshold); tied to GND or VAUX to set second bit of VOUT programming |
| VS1 (11) | VOUT select input | Logic input (0.4–1.2V threshold); tied to GND or VAUX to set first bit of VOUT programming |
| VOUT2_EN (12) | VOUT2 enable control | Active-high logic input with 5MΩ internal pull-down; 1V typical threshold ensures compatibility with 1.8V/3.3V MCUs |
| C1 (13) | Charge pump input | Connects to secondary winding via capacitor; forms part of internal rectifier circuit for VAUX generation |
| C2 (14) | N-channel gate drive input | Connects to secondary winding via capacitor; drives internal N-MOSFET gate through resonant tank |
| SW (15) | Internal N-MOSFET drain | Connects to primary winding of external transformer; switches at 10–100kHz depending on transformer inductance |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 20mV start-up | Enables energy harvesting from tiny thermal gradients (e.g., 1°C ΔT on 30mm² TEG), eliminating need for battery priming |
| Integrated 2.2V/3mA LDO | Powers low-leakage microcontrollers during VOUT ramp-up; decoupled from main output to prevent brownout during bursts |
| Selectably regulated VOUT | Four factory-programmed voltages eliminate external resistor networks and board leakage errors in high-impedance sensing nodes |
| VOUT2 logic-controlled switch | Reduces system standby power by disabling sensor biasing/amplifiers until measurement cycle - cuts average current by >90% |
| VSTORE backup path | Allows seamless transition to stored energy during input interruption; supports trickle-charging of NiMH batteries via current-limited path |
Applications
| Wireless Remote Sensor Node | Industrial Predictive Maintenance |
|---|---|
|
Use Scenario: Battery-free temperature/humidity sensor mounted on rotating machinery, transmitting data every 5 minutes using harvested heat from bearing housing. IC Role / Device Role / Timing Role: LTC3108EGN#TRPBF manages energy accumulation from TEG, regulates 3.3V for RF transceiver and 2.2V for MCU, sequences power-up using PGD, and enables VOUT2 to power analog front-end only during sampling. Use Value: Eliminates battery replacement in inaccessible locations; achieves >10-year operational life using <1°C thermal gradient; reduces maintenance cost by 70% vs. scheduled battery swaps. |
Use Scenario: Vibration sensor on HVAC ductwork powered by ambient temperature difference between duct surface and room air. IC Role / Device Role / Timing Role: LTC3108EGN#TRPBF converts <50mV TEG output into stable 2.35V for MEMS accelerometer and 2.2V for low-power DSP, uses VSTORE to sustain 2-second burst transmission during transient airflow blockage. Use Value: Enables continuous monitoring without wiring or battery logistics; maintains 99.9% uptime despite intermittent airflow-induced thermal fluctuations. |
| Smart Building Automation | Automatic Meter Reading (AMR) |
|
Use Scenario: Occupancy sensor in office ceiling powered by thermal gradient between ceiling tile and plenum space. IC Role / Device Role / Timing Role: LTC3108EGN#TRPBF harvests energy from ~2°C ΔT, programs VOUT to 4.1V for IR LED array, uses VLDO for motion-detection ASIC, and asserts PGD to wake MCU only when reservoir is charged. Use Value: Reduces installation cost by eliminating low-voltage wiring; achieves 15-year deployment life with zero maintenance; supports DALI-2 integration via regulated 4.1V rail. |
Use Scenario: Gas meter endpoint harvesting energy from temperature difference between pipe surface and ambient air. IC Role / Device Role / Timing Role: LTC3108EGN#TRPBF conditions micro-power from thermopile (up to 750mV), sets VOUT to 5V for LoRaWAN transceiver, leverages VOUT2_EN to power pressure sensor only during reading cycle. Use Value: Meets ANSI C12.19 security requirements via isolated power domains; extends battery-less operation to 20+ years in temperate climates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultralow-voltage energy harvesting applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17710G+T | Higher 300mV min start-up; integrates 100mF thin-film storage capacitor; no VOUT2 switch or LDO | Suited for photovoltaic-only harvesting; lacks TEG-optimized 20mV startup and dual-output sequencing | Choose MAX17710G+T only if input source consistently exceeds 300mV and integrated storage suffices |
| BQ25504RGTT | 200mV min start-up; includes MPPT engine for solar; no programmable VOUT or VOUT2 switch | Better for indoor light harvesting; cannot support TEG-based sub-50mV sources or host-controlled load switching | Select BQ25504RGTT when optimizing for amorphous silicon cells, not thermoelectric or thermopile sources |
Compared with LTC3108EGN#TRPBF, MAX17710G+T requires significantly higher input voltage and offers no LDO or VOUT2 control, while BQ25504RGTT lacks true 20mV capability and programmable outputs - making LTC3108EGN#TRPBF uniquely suited for TEG/thermopile-powered wireless sensors demanding precise voltage sequencing and burst-load management.
Availability
LTC3108EGN#TRPBF is available at Aetrix Electronics and suitable for wireless remote sensor nodes, industrial predictive maintenance systems, and smart building automation requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for LTC3108EGN#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 conversion technologies.
The LTC3108EGN#TRPBF belongs to Analog Devices' Energy Harvesting Power Management product line, engineered specifically to enable battery-free operation of ultra-low-power IoT endpoints using thermoelectric, thermal, and micro-solar energy sources.
FAQ
What is the minimum input voltage required for LTC3108EGN#TRPBF to start operating?
The LTC3108EGN#TRPBF has a guaranteed minimum start-up voltage of 20mV when using a 1:100 transformer turns ratio and VAUX = 0V. This allows direct operation from thermoelectric generators with temperature differentials as low as 1°C. Performance depends on transformer selection and source impedance - lower ESR sources (e.g., <2Ω) improve reliability at the 20mV threshold. The LTC3108EGN#TRPBF datasheet specifies this value under pulsed load conditions at TA = 25°C.
How does LTC3108EGN#TRPBF select its main output voltage (VOUT)?
The LTC3108EGN#TRPBF selects VOUT from four fixed values (2.35V, 3.3V, 4.1V, or 5V) using the logic states of VS1 and VS2 pins, which must be tied to either GND or VAUX. Table 1 in the LTC3108EGN#TRPBF datasheet defines the mapping: VS2=GND/VS1=GND → 2.35V; VS2=GND/VS1=VAUX → 3.3V; VS2=VAUX/VS1=GND → 4.1V; VS2=VAUX/VS1=VAUX → 5V. No external resistors are needed - the internal programmable divider ensures accuracy.
Can LTC3108EGN#TRPBF power both a microcontroller and a wireless transmitter simultaneously?
Yes - the LTC3108EGN#TRPBF supports concurrent powering via three independent outputs: VOUT (programmable 2.35–5V) for transceivers, VLDO (2.2V/3mA) for ultra-low-power MCUs, and VOUT2 (switched VOUT) for sensors or amplifiers. During transmit bursts, VOUT2 can be enabled to power RF front-end components only when needed, reducing average system current. The LTC3108EGN#TRPBF's 4.5mA VOUT current limit and 0.3A VOUT2 peak rating accommodate typical sub-GHz and BLE modules.
What is the role of the VSTORE pin on LTC3108EGN#TRPBF?
The VSTORE pin on LTC3108EGN#TRPBF provides a dedicated output to charge a large storage capacitor or rechargeable battery after VOUT reaches regulation. Once VOUT is stable, VSTORE charges to the VAUX clamp voltage (5.25V typical) and supplies power when the input source is unavailable. It features 0.1–0.3µA leakage at 5V, enabling multi-day hold-up for supercapacitors. The LTC3108EGN#TRPBF automatically draws from VSTORE if VAUX drops below VSTORE voltage.
Does LTC3108EGN#TRPBF include short-circuit protection?
Yes - all outputs of the LTC3108EGN#TRPBF are internally current-limited for short-circuit protection: VOUT and VSTORE are limited to 2.8–7.5mA, VOUT2 to 0.15–0.45A, and VLDO to 4–11mA. These limits are specified over the full –40°C to 125°C junction temperature range and activate within nanoseconds (e.g., 350ns for VOUT2). The LTC3108EGN#TRPBF continues normal operation after fault removal without latch-up or reset requirement.
LTC3108EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- 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:
- 16-SSOP
LTC3108EGN#TRPBF FAQ
1.How can I place an order for LTC3108EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3108EGN#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 LTC3108EGN#TRPBF reliable?
The price and inventory of LTC3108EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3108EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3108EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3108EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3108EGN#TRPBF?
LTC3108EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3108EGN#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 LTC3108EGN#TRPBF?
For technical support, including LTC3108EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3108EGN#TRPBF requirements.
6.How does Aetrix verify that LTC3108EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3108EGN#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 LTC3108EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3108EGN#TRPBF?
All LTC3108EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3108EGN#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 LTC3108EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3108EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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