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Analog Devices Inc. LTC3108EGN#PBF
- Part No.:
- LTC3108EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3108EGN#PBF.pdf
- Description:
- IC CONV BOOST PROG 4.5MA 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,304
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Product details
Overview
LTC3108EGN#PBF 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 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 via VSTORE - enabling autonomous wireless sensor nodes in HVAC, industrial monitoring, and predictive maintenance systems.
For engineers reviewing the LTC3108EGN#PBF datasheet, LTC3108EGN#PBF pinout, LTC3108EGN#PBF application, or LTC3108EGN#PBF equivalent, this page provides verified pin functions, real-world sequencing behavior, confirmed transformer interface requirements (1:20–1:100), validated current limits (VOUT: 4.5mA typ, VOUT2: 0.3A typ), and precise voltage-select logic mapping per VS1/VS2 states.
Technical Context
The LTC3108EGN#PBF uses a resonant MOSFET oscillator with external step-up transformer to boost sub-50mV inputs; oscillation frequency ranges 10kHz–100kHz depending on secondary inductance and input voltage. Its internal charge pump rectifies AC from the transformer secondary into VAUX, which powers all internal circuitry and enables output sequencing.
Output regulation relies on a precision micropower voltage reference activated above 2V VAUX, synchronous rectifiers engaged above 2V, and programmable resistor dividers eliminating external high-value feedback resistors. VOUT2 is controlled by a logic-compatible enable input (1V threshold, 5µs turn-on) driving a 1.3Ω P-channel switch with 0.3A peak current limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-up Voltage | 20mV min - enables operation from tiny ΔT across TEGs (e.g., 1°C differential) |
| Main Output Voltages | 2.35V / 3.3V / 4.1V / 5V - selected by VS1/VS2 logic states; no external resistors needed |
| LDO Output | 2.2V ±3% at 3mA - powers ultra-low-power MCUs; stable with ≥2.2µF ceramic cap |
| VOUT Current Limit | 4.5mA typical - sets max charging rate for 470µF reservoir capacitors |
| VOUT2 Switch RDS(on) | 1.3Ω - enables efficient pulsed powering of sensors/transceivers with <5µs soft-start |
| PGOOD Threshold | ±7.5% rising / −9% falling - provides reliable enable signal for host MCU wake-up |
| VAUX Clamp Voltage | 5.25V typical - protects internal circuitry and defines VSTORE upper bound |
Pinout & Package
Package: 16-lead plastic SSOP (narrow), 3.9mm × 9.9mm body, exposed thermal pad not present (unlike DFN variant); θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Ground reference | Four dedicated ground pins ensure low-impedance return paths for SW switching, analog reference, and LDO; critical for stability with microvolt-level inputs |
| SW (Pin 15) | N-Channel MOSFET drain | Connects to primary winding of step-up transformer; switches at 10–100kHz; requires low-inductance layout |
| C2 (Pin 14) | N-Channel gate drive input | Receives rectified AC from transformer secondary; drives internal N-FET gate via coupling capacitor |
| C1 (Pin 13) | Charge pump input | Accepts boosted AC from transformer secondary; feeds internal rectifier to generate VAUX |
| VOUT2_EN (Pin 12) | Logic enable input | 1V threshold with 100mV hysteresis; internal 5MΩ pull-down; controls VOUT2 P-FET switch |
| VS1 (Pin 11), VS2 (Pin 10) | VOUT programming inputs | Digital select lines tied to GND or VAUX; define VOUT voltage per Table 1 (e.g., VS1=VAUX, VS2=GND → 4.1V) |
| VOUT (Pin 4) | Main regulated output | Charged from VAUX; supplies wireless transmitters/sensors; current-limited to 4.5mA typical |
| VOUT2 (Pin 5) | Switched auxiliary output | Connected to VOUT only when VOUT2_EN is high; 1.3Ω switch supports 0.3A pulses |
| VLDO (Pin 6) | 2.2V LDO output | Powers microcontrollers; sourced from higher of VAUX or VOUT; requires ≥2.2µF ceramic bypass |
| PGD (Pin 7) | Open-drain power-good indicator | Pulled up to VLDO via 1MΩ; asserts high when VOUT within ±7.5%; sinks 100µA max |
| VSTORE (Pin 3) | Storage capacitor charger | Charges to VAUX clamp voltage (5.25V) after VOUT regulation; trickle-charges supercaps/batteries |
| VAUX (Pin 2) | Internal rectifier output & IC supply | Bypass with ≥1µF capacitor; powers all internal blocks; clamped at 5.25V; enables VOUT start at >2.5V |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 20mV start-up | Enables energy harvesting from sub-1°C TEG differentials without external bias or startup assist |
| Integrated 2.2V/3mA LDO | Provides clean, regulated supply for sleep-mode MCUs independent of VOUT charging state |
| VOUT voltage selection via VS1/VS2 | Eliminates external feedback resistors and board leakage errors; supports 4 fixed rails in one footprint |
| VOUT2 logic-controlled switch | Reduces system standby current by disabling sensor peripherals until measurement burst is required |
| VSTORE backup path | Allows continuous operation during input source interruption using charged supercapacitor or NiMH cell |
| Power-good sequencing | PGD signal enables deterministic MCU wake-up only after VOUT reaches regulation tolerance (±7.5%) |
Applications
| Industrial Wireless Sensing | Building Automation |
|---|---|
Use Scenario: Temperature/humidity sensors mounted on HVAC ducts harvest waste heat via TEGs to power periodic data transmission. IC Role / Device Role / Timing Role: LTC3108EGN#PBF acts as the sole power source and manager - converting µW-level TEG output into regulated 3.3V for RF transceiver and 2.2V for MCU. Use Value: Eliminates battery replacement in inaccessible locations; enables 10+ year deployment using 470µF reservoir + 0.1F VSTORE capacitor. |
Use Scenario: Occupancy and CO₂ sensors in smart offices use ambient thermal gradients to self-power. IC Role / Device Role / Timing Role: LTC3108EGN#PBF manages energy accumulation from thermopile generators and delivers timed bursts to BLE radios. Use Value: Achieves >99% duty-cycle sleep with <5µs VOUT2 activation, minimizing average current to <1µA during idle periods. |
| Predictive Maintenance | Automatic Metering |
Use Scenario: Vibration sensors on rotating machinery harvest energy from bearing temperature differentials. IC Role / Device Role / Timing Role: LTC3108EGN#PBF conditions TEG output, regulates 5V for MEMS accelerometer, and triggers PGD-driven acquisition cycles. Use Value: Supports 100ms measurement windows every 5 minutes using stored energy from VSTORE, avoiding mains wiring. |
Use Scenario: Smart water/gas meters deploy TEGs on pipe surfaces to convert flow-induced thermal gradients into operating power. IC Role / Device Role / Timing Role: LTC3108EGN#PBF charges VOUT to 4.1V for LoRaWAN transmitter and powers real-time clock via VLDO. Use Value: Enables 15-year battery-free operation using 0.1F supercapacitor charged over 2-hour accumulation intervals. |
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 rechargeable battery management but lacks VOUT2 switch and LDO | Suited for Li-ion backup systems; not viable for <50mV TEG sources or pulsed peripheral control | Select MAX17710G+T only if battery charging and fuel gauging are required and input exceeds 300mV |
| BQ25504RGTT | 200mV start-up; includes MPPT engine and cold-start circuit; no integrated LDO or VOUT2 logic switch | Better for solar cells with variable irradiance; requires external LDO and enable logic for sensor control | Choose BQ25504RGTT when optimizing photovoltaic input or needing adaptive MPPT, not for TEGs below 200mV |
Compared with MAX17710G+T and BQ25504RGTT, the LTC3108EGN#PBF uniquely combines 20mV start-up, integrated 2.2V LDO, and logic-gated VOUT2 switch - making it the only option capable of full autonomous operation from single-digit-millivolt TEG sources without external support circuitry.
Availability
LTC3108EGN#PBF is available at Aetrix Electronics and suitable for industrial wireless sensing, building automation, and predictive maintenance applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for energy-harvesting designs.
Supply support for LTC3108EGN#PBF 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 (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC3108EGN#PBF belongs to the Linear Technology Energy Harvesting Power Management product line, engineered specifically for autonomous, battery-free operation of ultra-low-power IoT sensors using thermoelectric, thermal, or micro-solar energy sources.
FAQ
What is the minimum input voltage required for LTC3108EGN#PBF to start up?
The LTC3108EGN#PBF has a guaranteed minimum start-up voltage of 20mV when using a 1:100 transformer turns ratio and VAUX = 0V. This allows reliable operation from thermoelectric generators with temperature differentials as low as 1°C. Performance degrades above 500mV input unless transformer ratio is reduced to avoid excessive secondary voltage.
How does LTC3108EGN#PBF select its main output voltage?
The LTC3108EGN#PBF selects VOUT from four fixed values (2.35V, 3.3V, 4.1V, or 5V) using logic states on VS1 and VS2 pins. These pins must be tied to GND or VAUX - not left floating - per Table 1 in the datasheet. No external resistors or programming interfaces are required, eliminating board leakage errors.
Can LTC3108EGN#PBF power a microcontroller directly?
Yes - the LTC3108EGN#PBF integrates a 2.2V low-dropout linear regulator (LDO) delivering up to 3mA, designed explicitly to power ultra-low-power microcontrollers. It is stable with a minimum 2.2µF ceramic capacitor and activates as soon as VAUX reaches 2.3V, often before VOUT is fully charged.
What is the function of the VOUT2 pin on LTC3108EGN#PBF?
VOUT2 on the LTC3108EGN#PBF is a switched auxiliary output controlled by the VOUT2_EN pin. When enabled, it connects to VOUT through a 1.3Ω P-channel MOSFET, delivering up to 0.3A peak current. Its 5µs soft-start minimizes glitching on VOUT during activation - ideal for powering sensors only during measurement bursts.
Does LTC3108EGN#PBF support supercapacitor charging?
Yes - the VSTORE pin on LTC3108EGN#PBF is designed to charge large storage elements including supercapacitors (e.g., 0.1F) and rechargeable batteries. Once VOUT reaches regulation, VSTORE charges to the VAUX clamp voltage (5.25V typical), providing backup power when the input source is interrupted.
What package type is used by LTC3108EGN#PBF?
The LTC3108EGN#PBF uses a 16-lead plastic SSOP (narrow) package measuring 3.9mm × 9.9mm, rated for –40°C to +125°C junction temperature. Unlike the DFN variant, it has four dedicated GND pins but no exposed thermal pad, resulting in higher thermal resistance (θJA = 110°C/W).
LTC3108EGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3108EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3108EGN#PBF 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#PBF reliable?
The price and inventory of LTC3108EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3108EGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3108EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3108EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3108EGN#PBF?
LTC3108EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3108EGN#PBF 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#PBF?
For technical support, including LTC3108EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3108EGN#PBF requirements.
6.How does Aetrix verify that LTC3108EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3108EGN#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3108EGN#PBF?
All LTC3108EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3108EGN#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3108EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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