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Analog Devices Inc. LTC3108EGN-1#PBF
- Part No.:
- LTC3108EGN-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3108EGN-1#PBF.pdf
- Description:
- IC VOLTAGE CONVERTER 16-SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:213
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Product details
Overview
LTC3108EGN-1#PBF from Analog Devices (formerly Linear Technology) 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 operates from input voltages as low as 20mV, delivers four selectable regulated main outputs (2.5V/3V/3.7V/4.5V), integrates a 2.2V/3mA LDO, and supports storage capacitor backup for intermittent sources - enabling self-powered wireless sensor nodes.
For engineers reviewing the LTC3108EGN-1#PBF datasheet, LTC3108EGN-1#PBF pinout, LTC3108EGN-1#PBF application, or LTC3108EGN-1#PBF equivalent, key selection criteria include minimum startup voltage (20mV), VOUT programmability via VS1/VS2 logic pins, VOUT2 enable-controlled switching with 1.3Ω P-MOSFET, PGOOD monitoring with ±7.5% threshold, and thermal performance in the 16-lead SSOP package (θJA = 110°C/W).
Technical Context
The LTC3108EGN-1#PBF uses a resonant step-up oscillator driving an external transformer (e.g., 1:100 turns ratio) to boost sub-50mV inputs; oscillation frequency falls within 10kHz–100kHz depending on secondary inductance. Its internal synchronous rectifiers activate once VAUX exceeds 2V, improving efficiency over diode-based topologies.
It implements hierarchical output sequencing: VAUX charges first (clamped at 5.25V), enabling VLDO (2.2V) at ~2.3V, then VOUT charging begins above 2.5V, followed by VSTORE and logic-enabled VOUT2. All outputs feature current limiting (VOUT/VSTORE: 4.5mA typ; VOUT2: 0.3A typ) and short-circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Min Startup Voltage | 20mV - enables operation from tiny ΔT across TEGs (e.g., 1°C differential) |
| VOUT Options | 2.5V / 3.0V / 3.7V / 4.5V - selected via VS1/VS2 logic pins; no external resistors needed |
| LDO Output | 2.2V @ 3mA - powers ultra-low-power MCUs independently of VOUT charge state |
| VOUT2 Switch | 1.3Ω P-channel MOSFET - enables host-controlled burst powering of sensors/transceivers |
| PGOOD Threshold | ±7.5% rising / −9% falling - provides reliable enable signal for downstream processors |
| Quiescent Current | 3µA no-load input - minimizes drain on weak energy sources during idle periods |
| Package | 16-lead SSOP (narrow), 4mm × 5mm - thermally rated to 125°C junction, θJA = 110°C/W |
Pinout & Package
Package: 16-lead plastic SSOP (narrow), 4mm × 5mm body, exposed pad not present (unlike DFN variant). Thermal resistance θJA = 110°C/W. Operating junction temperature range: –40°C to +125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Ground reference | Four dedicated ground pins provide low-impedance return paths for SW, C2, VAUX, and analog circuits |
| SW (Pin 15) | N-channel switch drain | Connects to primary winding of step-up transformer; handles resonant switching current up to ~300mA peak |
| C2 (Pin 14) | N-ch gate drive input | Drives transformer secondary via coupling capacitor; AC-coupled node referenced to GND |
| C1 (Pin 13) | Charge pump input | Accepts rectified AC from transformer secondary; feeds internal rectifier to charge VAUX |
| VOUT2_EN (Pin 12) | Logic enable input | Active-high control (1V threshold, 5MΩ pull-down) for VOUT2 switch; enables host-synchronized power gating |
| VS1 / VS2 (Pins 11 / 10) | VOUT programming inputs | Binary-select fixed output voltage (2.5V/3V/3.7V/4.5V); tied to GND or VAUX for configuration |
| VOUT (Pin 4) | Main regulated output | Charged from VAUX; supplies wireless transmitters or sensor bias rails; current-limited to 4.5mA typ |
| VOUT2 (Pin 5) | Switched auxiliary output | Connected to VOUT only when enabled; 0.3A peak current limit protects against shorts |
| VLDO (Pin 6) | 2.2V LDO output | Powers microcontrollers directly; requires ≥2.2µF ceramic capacitor; dropout ≤200mV @ 2mA |
| PGD (Pin 7) | Power good indicator | Open-drain output pulled up to VLDO (1MΩ); asserts high when VOUT is within regulation window |
| VSTORE (Pin 3) | Storage capacitor charger | Trickle-charges supercapacitors/batteries after VOUT regulation; limited to ~4.5mA |
| VAUX (Pin 2) | Internal rectifier output & IC supply | Bypass with ≥1µF capacitor; clamped at 5.25V; powers all internal circuitry and enables VOUT charging |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow-input operation | Starts at 20mV - harvests usable power from <1°C TEG differentials without pre-bias |
| Integrated multi-rail power management | Combines step-up converter, 2.2V LDO, programmable VOUT, VOUT2 switch, and VSTORE charger in one IC |
| Transformer-driven topology | Uses compact off-chip 1:20–1:100 transformers - avoids large inductors and enables scalability across input ranges |
| Intelligent output sequencing | VAUX → VLDO → VOUT → VSTORE → VOUT2 ensures stable boot and prevents brownout during capacitor charging |
| Low-quiescent-current design | 3µA no-load input current - maximizes net energy capture from microwatt-level sources |
Applications
| Wireless Sensor Node Power | Industrial Predictive Maintenance |
|---|---|
Use Scenario: Self-powered temperature/humidity sensor node mounted on rotating machinery, harvesting waste heat via TEG. IC Role / Device Role / Timing Role: LTC3108EGN-1#PBF acts as sole power source - converts <50mV TEG output into 3.0V for MCU sleep mode and 4.5V burst transmit rail. Use Value: Eliminates battery replacement in inaccessible locations; enables >10-year deployment using only ambient thermal gradients. | Use Scenario: Vibration-monitoring node on HVAC ductwork, powered by thermopile exposed to exhaust heat. IC Role / Device Role / Timing Role: LTC3108EGN-1#PBF manages energy accumulation during steady-state operation and releases stored charge for periodic FFT analysis bursts. Use Value: Sustains 100ms measurement windows every 5 minutes using only 200mV thermopile input - no external power required. |
| Building Automation Node | Smart Meter Data Logger |
Use Scenario: Occupancy-sensing node in LED lighting fixture, harvesting energy from driver heat dissipation. IC Role / Device Role / Timing Role: LTC3108EGN-1#PBF regulates 2.5V for IR sensor and 3.7V for BLE radio; VOUT2 enables sensor only during detection cycles. Use Value: Reduces system standby current to <1µA by powering peripherals on-demand - extends functional lifetime beyond 15 years. | Use Scenario: Utility meter add-on module logging consumption data, powered by miniature solar cell under indoor lighting. IC Role / Device Role / Timing Role: LTC3108EGN-1#PBF conditions 300mV photovoltaic output into stable 4.5V for EEPROM writes and RF transmission. Use Value: Achieves reliable 10k write cycles/year using only 100-lux ambient light - no battery or wired connection needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar energy harvesting power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17710G+T | Integrated Li-ion charger; no VOUT2 switch; lower min input (800nA IQ but 300mV min start) | Better suited for battery-backed systems; lacks host-controlled auxiliary output | Select MAX17710G+T when rechargeable battery integration is mandatory and input voltage exceeds 300mV. |
| BQ25504RGTT | Higher quiescent current (330nA vs 3µA); includes MPPT engine; 2.2V LDO absent | Optimized for solar input with variable irradiance; requires external LDO for MCU supply | Choose BQ25504RGTT for photovoltaic-dominant systems needing dynamic MPPT, accepting added BOM complexity. |
Compared with MAX17710G+T and BQ25504RGTT, the LTC3108EGN-1#PBF uniquely combines sub-50mV startup, integrated LDO, and logic-gated VOUT2 in a single SSOP package - making it optimal for TEG-powered wireless sensing where ultra-low-voltage operation and peripheral power gating are critical.
Availability
LTC3108EGN-1#PBF is available at Aetrix Electronics and suitable for industrial predictive maintenance, building automation, smart metering, and wireless sensor network applications requiring stable component supply across extended product lifecycles.
Supply support for LTC3108EGN-1#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, Inc. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies.
The LTC3108EGN-1#PBF belongs to ADI's Energy Harvesting Power Management product line, engineered specifically to extract usable power from microwatt-scale ambient sources like thermoelectric and photovoltaic generators for maintenance-free IoT endpoints.
FAQ
What is the minimum input voltage required for LTC3108EGN-1#PBF to start up?
The LTC3108EGN-1#PBF starts up from as low as 20mV when used with a 1:100 transformer turns ratio and zero auxiliary bias (VAUX = 0V). This specification is guaranteed over the full –40°C to +125°C operating junction temperature range. Startup voltage increases with lower turns ratios or higher source impedance - e.g., 50mV typical with 1:50 ratio.
How do I configure the main output voltage (VOUT) on LTC3108EGN-1#PBF?
The LTC3108EGN-1#PBF VOUT is set to 2.5V, 3.0V, 3.7V, or 4.5V by connecting VS1 and VS2 pins to GND or VAUX per Table 1 in the datasheet. For example: VS1 = GND, VS2 = GND → 2.5V; VS1 = VAUX, VS2 = GND → 3.7V. No external resistors or programming interface is required - configuration is purely hardware-based.
Does LTC3108EGN-1#PBF support charging rechargeable batteries?
Yes - the LTC3108EGN-1#PBF VSTORE output can trickle-charge NiCd/NiMH batteries or supercapacitors after VOUT reaches regulation. VSTORE is current-limited to ~4.5mA and charges to the VAUX clamp voltage (5.25V typ). It is not intended for fast charging or lithium-based chemistries without external protection circuitry.
What is the function of the VOUT2 pin on LTC3108EGN-1#PBF, and how is it controlled?
VOUT2 on the LTC3108EGN-1#PBF is a host-controlled switched output connected to VOUT via a 1.3Ω P-channel MOSFET. It is enabled by driving VOUT2_EN high (≥1V threshold); an internal 5MΩ pull-down keeps it disabled by default. VOUT2 delivers up to 0.3A peak and features 5µs soft-start to minimize VOUT disturbance during activation.
Can LTC3108EGN-1#PBF operate without an external transformer?
No - the LTC3108EGN-1#PBF requires an external step-up transformer (e.g., Coilcraft LPR6235-104, Wurth 750313740) to achieve voltage gain from ultralow inputs. The transformer forms the core of its resonant oscillator topology; omitting it prevents any output regulation. C1 and C2 capacitors must also be populated per the recommended values in the datasheet.
LTC3108EGN-1#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-1#PBF FAQ
1.How can I place an order for LTC3108EGN-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3108EGN-1#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-1#PBF reliable?
The price and inventory of LTC3108EGN-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3108EGN-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3108EGN-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3108EGN-1#PBF?
LTC3108EGN-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3108EGN-1#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-1#PBF?
For technical support, including LTC3108EGN-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3108EGN-1#PBF requirements.
6.How does Aetrix verify that LTC3108EGN-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3108EGN-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3108EGN-1#PBF?
All LTC3108EGN-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3108EGN-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LTC3108EGN-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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