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Analog Devices Inc. LTC3129EUD-1#PBF
- Part No.:
- LTC3129EUD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3129EUD-1#PBF.pdf
- Description:
- IC REG BUCK BST PROG 200MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,996
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Product details
Overview
LTC3129EUD-1#PBF from Analog Devices (formerly Linear Technology) is a 200mA synchronous buck-boost DC/DC converter with 1.3µA quiescent current, wide 1.92V–15V input range, fixed-output voltage selection (2.5V–15V), and integrated maximum power point control (MPPC) for energy harvesting applications such as solar-powered wireless sensor nodes.
For engineers reviewing the LTC3129EUD-1#PBF datasheet, LTC3129EUD-1#PBF pinout, LTC3129EUD-1#PBF application, or LTC3129EUD-1#PBF equivalent, key selection considerations include its 1.2MHz PWM switching architecture, eight-pin-programmable output voltages, thermally enhanced 3mm × 3mm QFN package, and MPPC-enabled operation from photovoltaic or low-voltage battery sources.
Technical Context
The LTC3129EUD-1#PBF employs average current mode control with an internally compensated transconductance amplifier to regulate VOUT via an internal voltage divider and inductor current sensing. Its proprietary four-switch buck-boost topology enables seamless transitions between buck, boost, and pass-through modes without sub-harmonic oscillation or output transients.
It integrates dual bootstrapped gate drivers (BST1/BST2), programmable RUN threshold (1.22V rising), and MPPC feedback that servo-controls VIN to 1.175V × (1 + R5/R6) for optimal power extraction. Burst Mode® operation reduces quiescent current to 1.3µA at light loads while maintaining regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.92V to 15V after startup; supports single-cell Li-ion, AA/AAA, and photovoltaic inputs |
| Output Current | 200mA in buck mode; sufficient for powering RF transceivers and microcontrollers in ultra-low-power systems |
| Quiescent Current | 1.3µA in Burst Mode; enables multi-year battery life in energy-constrained IoT sensors |
| Switching Frequency | 1.2MHz nominal; allows use of compact 10µH inductors and ceramic capacitors for minimal PCB footprint |
| Output Voltage Options | Eight fixed settings (2.5V–15V) selected by VS1–VS3 logic pins; eliminates external feedback resistors |
| MPPC Input Threshold | 1.175V ±25mV; enables precise tracking of photovoltaic panel maximum power point |
| Shutdown Current | <10nA; ensures near-zero leakage during system sleep states |
Pinout & Package
The LTC3129EUD-1#PBF is housed in a thermally enhanced 16-lead (3mm × 3mm) plastic QFN package with exposed PGND pad (Pin 17) requiring soldering to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 (Pin 1) | Boot-strapped supply for SW1 high-side driver | Connects via 22nF capacitor to SW1; enables NMOS gate drive above VIN rail |
| VIN (Pin 2) | Main input power supply | Accepts 1.92V–15V; requires ≥4.7µF ceramic decoupling close to pin |
| VCC (Pin 3) | Internal LDO output (4.1V typ) | Powers internal circuitry; can be back-driven up to 5.5V; bypass with ≥2.2µF |
| RUN (Pin 4) | Enable comparator input | Turns on VCC at >0.9V, enables switching at >1.22V (rising); hysteresis = 80–120mV |
| MPPC (Pin 5) | Maximum Power Point Control reference | Programs VIN regulation point (1.175V × [1+R5/R6]); highly noise-sensitive; tie to VCC if unused |
| GND (Pin 6) | Signal ground reference | Must connect directly to PCB ground plane; separate from PGND path |
| VS3 (Pin 7) | Output voltage select bit 2 | Logic input (0/VCC) defining one of eight VOUT settings per Table 1 |
| VS2 (Pin 8) | Output voltage select bit 1 | Logic input (0/VCC); combined with VS1/VS3 to set 2.5V–15V output |
| VS1 (Pin 9) | Output voltage select bit 0 | Logic input (0/VCC); no floating allowed; series 1MΩ resistor if driven above VCC |
| PWM (Pin 10) | Mode selection control | Low = Burst Mode (1.3µA IQ); High = fixed 1.2MHz PWM; internal 5MΩ pull-down |
| PGOOD (Pin 11) | Open-drain power-good indicator | Sinks ≤15mA when VOUT drops >7.5% below programmed value; requires external pull-up |
| VOUT (Pin 12) | Regulated output voltage | Delivers up to 200mA; requires ≥4.7µF ceramic capacitor to PGND |
| BST2 (Pin 13) | Boot-strapped supply for SW2 high-side driver | Connects via 22nF capacitor to SW2; enables NMOS gate drive above VOUT rail |
| SW2 (Pin 14) | High-side switch node (boost path) | Connects to inductor; short/wide trace required to minimize EMI and conduction loss |
| PGND (Pin 15) | Power ground return | Primary current return path; must be connected to exposed pad (Pin 17) and PCB ground plane |
| SW1 (Pin 16) | High-side switch node (buck path) | Connects to inductor; same layout rules as SW2; shares inductor with SW2 in 4-switch topology |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MPPC circuitry | Enables autonomous optimization of power extraction from photovoltaic panels or fuel cells without external controllers |
| Eight-pin-selectable output voltages | Eliminates external feedback resistors and associated layout sensitivity; supports common MCU/RF supply rails |
| 1.3µA Burst Mode quiescent current | Extends battery life in intermittently active sensor nodes where average load current is <100µA |
| Seamless buck-boost mode transitions | Prevents output glitches during VIN crossing VOUT; critical for stable power in variable-source applications |
| Thermally enhanced QFN package | θJA = 68°C/W with proper PGND pad soldering; supports 200mA continuous output at ambient ≤85°C |
Applications
| Industrial Wireless Sensor Nodes | Post-Regulator for Harvested Energy |
|---|---|
Use Scenario: Battery- or solar-powered temperature/humidity sensors transmitting data every 5 minutes via LoRaWAN or BLE. IC Role / Device Role / Timing Role: Primary power regulator converting variable photovoltaic or alkaline cell output to stable 3.3V for MCU and radio. Use Value: 1.3µA quiescent current and MPPC maximize usable energy from small solar cells, enabling maintenance-free operation for >5 years. | Use Scenario: Piezoelectric or thermoelectric energy harvester powering a vibration monitor in predictive maintenance systems. IC Role / Device Role / Timing Role: Wide-input buck-boost regulator interfacing ultra-low-current, high-impedance sources to standard 3.3V logic rails. Use Value: 1.92V startup and programmable RUN threshold allow reliable turn-on even as harvester output drifts with environmental conditions. |
| Solar Panel Post-Regulator/Charger | Intrinsically Safe Power Supplies |
Use Scenario: Compact solar charger for rechargeable LiFePO₄ backup batteries in remote telemetry units. IC Role / Device Role / Timing Role: Regulates solar panel output to fixed 3.65V charging voltage while extracting maximum available power via MPPC. Use Value: Integrated MPPC eliminates need for external MPPT controller IC and associated firmware, reducing BOM count and design complexity. | Use Scenario: Power management in explosion-proof gas detectors deployed in hazardous Class I Div 1 locations. IC Role / Device Role / Timing Role: Isolated, low-power DC/DC stage providing regulated 5V for sensor signal conditioning and analog front-end. Use Value: <10nA shutdown current and accurate RUN threshold enable fail-safe power sequencing compliant with IEC 60079-11 intrinsic safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3129EMSE-1#PBF | Same functionality and specs; packaged in 16-lead MSOP instead of 3mm × 3mm QFN | Higher θJA (40°C/W vs 68°C/W) and larger footprint; better suited for prototyping or lower-power layouts | Select when thermal constraints permit larger package or when MSOP is preferred for hand-soldering or legacy board compatibility |
| LTC3129-1#TRPBF | Identical die and specs; differs only in tape-and-reel packaging (2,500-unit reel vs 250-unit tray) | No functional or electrical difference; intended for automated SMT assembly rather than evaluation or low-volume builds | Select for high-volume production runs requiring standard machine-ready packaging |
Compared with LTC3129EMSE-1#PBF, the LTC3129EUD-1#PBF offers superior thermal performance in space-constrained designs, while LTC3129-1#TRPBF provides identical electrical behavior optimized for manufacturing scalability-neither is pin-compatible with non–LTC3129-1 family members.
Availability
LTC3129EUD-1#PBF is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, solar-powered telemetry systems, and intrinsically safe instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC3129EUD-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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for all Linear power management products.
The LTC3129-1 product line was designed specifically for ultra-low-power energy harvesting and battery-operated applications where micropower efficiency, wide input range, and autonomous power optimization are critical.
FAQ
What is the minimum input voltage required for the LTC3129EUD-1#PBF to start switching?
The LTC3129EUD-1#PBF requires a minimum VIN of 2.42V to initiate switching after startup. However, once operational, it sustains regulation down to 1.92V due to bootstrap-assisted gate drive. This two-threshold behavior enables reliable cold-start from weak or partially discharged sources like aging alkaline cells or low-light photovoltaic arrays - a key capability confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet for LTC3129EUD-1#PBF.
How does the MPPC function work on the LTC3129EUD-1#PBF, and what external components are needed?
The MPPC function on the LTC3129EUD-1#PBF uses Pin 5 (MPPC) as a precision 1.175V reference input. Connecting it to a resistor divider from VIN to GND programs the input voltage regulation point as VIN = 1.175V × (1 + R5/R6). No op-amps or external controllers are required - the LTC3129EUD-1#PBF internally compares MPPC voltage to its reference and adjusts inductor current to hold VIN at the programmed value. Layout best practices require short traces and shielding to avoid noise coupling, as specified in the Pin Functions section of the LTC3129EUD-1#PBF datasheet.
Can the LTC3129EUD-1#PBF operate with an output voltage higher than its input voltage?
Yes, the LTC3129EUD-1#PBF operates in true boost mode when VOUT > VIN, delivering up to 200mA. Its four-NMOS-switch architecture and proprietary control algorithm maintain regulation seamlessly across buck (VIN > VOUT), boost (VIN < VOUT), and pass-through (VIN ≈ VOUT) regions without output glitches or mode-switching transients - a behavior verified in the Typical Application schematic and Step Load Transient Response waveforms for LTC3129EUD-1#PBF.
What is the purpose of the exposed pad (Pin 17) on the LTC3129EUD-1#PBF QFN package?
The exposed pad (Pin 17) on the LTC3129EUD-1#PBF is electrically and thermally connected to PGND. It must be soldered to a dedicated PCB ground plane area to achieve the specified θJA of 68°C/W and ensure safe operation at full 200mA load. Failure to solder this pad results in significantly degraded thermal performance and potential thermal shutdown, as explicitly warned in Note 6 of the LTC3129EUD-1#PBF datasheet.
How do the VS1, VS2, and VS3 pins configure the output voltage on the LTC3129EUD-1#PBF?
The VS1, VS2, and VS3 pins on the LTC3129EUD-1#PBF are digital inputs that select one of eight fixed output voltages (2.5V to 15V) using binary encoding per Table 1 in the datasheet. Each pin accepts 0V (GND) or VCC (typically 4.1V) logic levels - floating or negative voltages are prohibited. For example, VS3=0V, VS2=VCC, VS1=0V configures 4.1V output. This eliminates external feedback resistors and associated tolerance errors, simplifying design for the LTC3129EUD-1#PBF in cost- and space-sensitive applications.
LTC3129EUD-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.92V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 200mA
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3129EUD-1#PBF FAQ
1.How can I place an order for LTC3129EUD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3129EUD-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 LTC3129EUD-1#PBF reliable?
The price and inventory of LTC3129EUD-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 LTC3129EUD-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3129EUD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3129EUD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3129EUD-1#PBF?
LTC3129EUD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3129EUD-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 LTC3129EUD-1#PBF?
For technical support, including LTC3129EUD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3129EUD-1#PBF requirements.
6.How does Aetrix verify that LTC3129EUD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3129EUD-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 LTC3129EUD-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3129EUD-1#PBF?
All LTC3129EUD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3129EUD-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 LTC3129EUD-1#PBF part is unused and in its original packaging.
Return procedure for LTC3129EUD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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