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Analog Devices Inc. LTC3129EUD#PBF
- Part No.:
- LTC3129EUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3129EUD#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 200MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,135
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Product details
Overview
LTC3129EUD#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous buck-boost DC/DC converter with 200mA output current capability, 1.3µA quiescent current in Burst Mode, and wide input/output voltage ranges (VIN: 1.92V–15V after startup; VOUT: 1.4V–15.75V). It integrates programmable maximum power point control (MPPC) for photovoltaic energy harvesting and operates at a fixed 1.2MHz PWM frequency to enable compact designs using 10µH inductors and ceramic capacitors. It is used in ultra-low-power industrial wireless sensor nodes and solar-charged microsystems.
For engineers reviewing the LTC3129EUD#PBF datasheet, LTC3129EUD#PBF pinout, LTC3129EUD#PBF application, or LTC3129EUD#PBF equivalent, key selection criteria include its accurate RUN pin threshold (1.22V rising), MPPC voltage programming range (1.12V–1.22V), 10nA shutdown current, thermally enhanced 3mm × 3mm QFN package with exposed PGND pad, and seamless buck/boost mode transitions without output transients.
Technical Context
The LTC3129EUD#PBF employs average current mode control with an internally compensated transconductance error amplifier and dual N-channel switch drivers. Its proprietary four-switch buck-boost topology enables regulation when VIN is above, below, or equal to VOUT - eliminating need for external diodes or complex sequencing.
It features integrated loop compensation, soft-start, and dual bootstrapped gate drives (BST1/BST2) supporting 90ns minimum switch off-time. The MPPC function servo-controls VIN to a user-programmed voltage (via resistor divider on MPPC pin) to maximize power extraction from high-impedance sources like PV cells, while the RUN comparator provides precise enable/disable thresholds with 80mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1.92V–15V after startup; enables operation from single-cell LiFePO₄ (2.0V) or multi-cell systems without pre-regulation |
| VOUT Range | 1.4V–15.75V adjustable via FB resistor divider; supports rail-to-rail system voltage scaling including 3.3V, 5V, and 12V outputs |
| IOUT (Buck) | 200mA typical; sufficient for RF transceivers, low-power MCUs, and analog sensors in battery-constrained nodes |
| Quiescent Current | 1.3µA in Burst Mode; extends battery life in intermittently active IoT endpoints (e.g., 10-year coin-cell operation) |
| Switching Frequency | 1.2MHz nominal; allows use of 10µH/0805 inductors and 10µF X7R ceramics, reducing solution footprint to <25mm² |
| MPPC Voltage | 1.175V ±25mV; sets precise input voltage target for maximum power transfer from photovoltaic panels or TEGs |
| RUN Threshold | 1.22V (rising), 1.16V (falling); enables predictable cold-start from weak energy harvesters with minimal external components |
Pinout & Package
The LTC3129EUD#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. θJC = 7.5°C/W and θJA = 68°C/W (with proper layout).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 (Pin 1) | Bootstrap supply for SW1 high-side driver | Must connect to SW1 via 22nF capacitor; enables NMOS gate drive above VIN for buck operation |
| VIN (Pin 2) | Main input supply input | Accepts 1.92V–15V; requires ≥4.7µF ceramic decoupling close to pin for stability |
| VCC (Pin 3) | Internal LDO output (4.1V typ) | Powers internal circuitry; can be back-driven up to 5.5V; bypass with ≥2.2µF ceramic |
| RUN (Pin 4) | Enable comparator input | 1.22V rising threshold enables switching; resistor divider from VIN allows programmable turn-on voltage |
| MPPC (Pin 5) | Maximum Power Point Control reference | 1.175V internal reference; connect to VIN/resistor divider to regulate input voltage for max power harvest |
| GND (Pin 6) | Signal ground reference | Low-impedance path to PGND plane required; separate from power ground routing |
| FB (Pin 7) | Feedback input to error amplifier | 1.175V reference; VOUT = 1.175V × (1 + R1/R2); noise-sensitive-minimize trace length |
| NC (Pins 8,9) | No-connect terminals | Must be grounded per datasheet; not internally connected |
| PWM (Pin 10) | Mode select input | Low = Burst Mode (1.3µA IQ); High = fixed 1.2MHz PWM; internal 5MΩ pull-down |
| PGOOD (Pin 11) | Open-drain power-good indicator | Asserts low when VOUT drops >7.5% below regulation; sinks up to 15mA |
| VOUT (Pin 12) | Regulated output voltage | Delivers up to 200mA; requires ≥4.7µF ceramic output cap close to pin |
| BST2 (Pin 13) | Bootstrap supply for SW2 high-side driver | Must connect to SW2 via 22nF capacitor; enables NMOS gate drive above VOUT for boost operation |
| SW2 (Pin 14) | Boost-mode switch node | Connects to one end of inductor; short/wide PCB trace required to minimize EMI and losses |
| PGND (Pins 15,17) | Power ground return | Exposed pad (Pin 17) must be soldered to PCB ground plane for thermal conduction and low-impedance return |
| SW1 (Pin 16) | Buck-mode switch node | Connects to other end of inductor; same layout rules as SW2 for EMI control |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost mode transition | Eliminates output voltage glitches during VIN crossing VOUT-critical for noise-sensitive analog/RF circuits |
| Programmable MPPC | Enables direct interface to photovoltaic panels or thermoelectric generators without external MPPT controllers |
| 1.3µA Burst Mode quiescent current | Supports >10-year battery life in wake-sleep sensor nodes with sub-100µA average system current |
| Accurate RUN pin threshold (±60mV) | Allows reliable cold-start from harvested energy sources with no external supervisor IC |
| Integrated loop compensation & soft-start | Reduces design cycle time-no external compensation network or soft-start capacitor required |
| 10nA shutdown current | Permits complete system power gating during long idle periods without leakage-induced drain |
Applications
| Industrial Wireless Sensor Nodes | Solar Panel Post-Regulator/Charger |
|---|---|
Use Scenario: Battery- or energy-harvesting–powered temperature/humidity sensor transmitting data every 5 minutes via LoRaWAN. IC Role / Device Role / Timing Role: Primary DC/DC regulator converting variable PV or LiSOCl₂ input to stable 3.3V for MCU, radio, and sensors. Use Value: 1.3µA quiescent current and MPPC extend usable sunlight hours by 22% vs. non-MPPT solutions; 1.2MHz switching avoids RF band interference. |
Use Scenario: Indoor solar-powered occupancy sensor using amorphous silicon mini-panel (<50mA ISC) under ambient light. IC Role / Device Role / Timing Role: Buck-boost post-regulator extracting maximum power from low-voltage, high-impedance PV source into rechargeable Li-ion cell. Use Value: MPPC pin programmed to 2.8V ensures peak power capture even at 0.5 lux; 1.92V startup enables operation at dawn/dusk. |
| Intrinsically Safe Power Supplies | Avionics-Grade Wireless Headsets |
Use Scenario: Hazardous-area gas detector with explosion-proof enclosure requiring <100mW total power budget. IC Role / Device Role / Timing Role: Isolated, low-noise power stage delivering regulated 5V from 3.6V primary battery with fault-safe shutdown. Use Value: 10nA shutdown current prevents battery drain during maintenance; PGOOD signal enables system-level safety monitoring. |
Use Scenario: FAA-certified headset with Bluetooth LE audio and active noise cancellation powered by single LiPo cell. IC Role / Device Role / Timing Role: Efficient buck-boost converter maintaining 3.3V rail across full battery discharge (4.2V→3.0V) with minimal EMI. Use Value: 1.2MHz fixed-frequency PWM avoids audible noise in ANC feedback loop; seamless mode transition prevents audio dropouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3129-1EUD#PBF | Fixed-output variants (e.g., 3.3V, 5V); no FB resistor divider needed; identical quiescent current and MPPC | Used where output voltage is static and board space is constrained-eliminates two external resistors | Select when VOUT is fixed and MPPC functionality remains required; same package and thermal performance |
| TPS63051DSGR | Lower IQ (3.5µA), no MPPC, 1.8V–5.5V VIN, 2A output; uses different control architecture (hysteretic) | Suitable for higher-current, non-energy-harvesting apps like portable medical devices; lacks precision RUN/MPPC pins | Choose only if MPPC and sub-2µA IQ are unnecessary and higher output current is prioritized over ultra-low IQ |
Compared with LTC3129-1EUD#PBF, the LTC3129EUD#PBF offers full output adjustability at the cost of two FB resistors; compared with TPS63051DSGR, it delivers 3.7× lower quiescent current and dedicated MPPC circuitry essential for energy harvesting-but with lower maximum output current.
Availability
LTC3129EUD#PBF is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, solar-powered IoT edge devices, and intrinsically safe instrumentation requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3129EUD#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 product support, datasheets, and application engineering for the LTC portfolio. Linear's legacy focus on precision power and signal conditioning remains core to ADI's high-reliability analog roadmap.
The LTC3129 belongs to Linear's ultralow-power buck-boost converter family designed specifically for energy-constrained systems-emphasizing sub-2µA quiescent current, programmable power management pins (RUN/MPPC), and seamless mode transitions for mission-critical sensing and harvesting applications.
FAQ
What is the minimum input voltage required for the LTC3129EUD#PBF to start switching?
The LTC3129EUD#PBF requires a minimum VIN of 2.42V to initiate switching when starting from zero input. After startup, it sustains regulation down to 1.92V due to bootstrap operation. This 1.92V–15V operating range enables compatibility with partially discharged LiFePO₄ cells and low-light photovoltaic sources. The RUN pin threshold (1.22V rising) further allows controlled enablement before full startup.
How does the MPPC function work in the LTC3129EUD#PBF, and what external components are needed?
The MPPC pin in the LTC3129EUD#PBF references an internal 1.175V bandgap. Connecting it to a resistor divider from VIN to GND programs the input voltage at which the converter regulates-ensuring maximum power extraction from PV or TEG sources. For example, a 100kΩ–100kΩ divider sets VIN = 2.35V. No op-amps or external controllers are required; the LTC3129EUD#PBF performs closed-loop servoing internally.
Can the LTC3129EUD#PBF operate in both buck and boost modes simultaneously, and how is mode transition handled?
Yes-the LTC3129EUD#PBF continuously operates in buck, boost, or buck-boost boundary mode depending on instantaneous VIN/VOUT ratio. Its four-NMOS switch architecture and proprietary control algorithm ensure seamless, transient-free transitions between modes. Unlike conventional buck-boost ICs, there is no discontinuity in inductor current or output voltage during VIN crossing VOUT, making it ideal for battery-powered systems with varying load profiles.
What is the purpose of the BST1 and BST2 pins on the LTC3129EUD#PBF, and what capacitor value is recommended?
BST1 and BST2 provide floating gate-drive supplies for the high-side NMOS switches (SW1 and SW2). Each must be connected to its respective switch node via a 22nF ceramic capacitor placed as close as possible to the IC. Values from 4.7nF to 47nF are acceptable. These capacitors enable efficient gate charging above VIN (for buck) or above VOUT (for boost), eliminating need for external charge pumps or level shifters.
Does the LTC3129EUD#PBF require external compensation components, and what is the role of the PWM pin?
No-the LTC3129EUD#PBF includes fully integrated loop compensation and requires no external components for stability. The PWM pin selects operating mode: logic low enables Burst Mode (1.3µA IQ, optimal for light loads); logic high forces fixed 1.2MHz PWM (lower noise, higher efficiency at medium loads). An internal 5MΩ pull-down ensures default Burst Mode if left unconnected.
LTC3129EUD#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.92V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 1.4V
- Voltage - Output (Max):
- 15.75V
- 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#PBF FAQ
1.How can I place an order for LTC3129EUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3129EUD#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#PBF reliable?
The price and inventory of LTC3129EUD#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3129EUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3129EUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3129EUD#PBF?
LTC3129EUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3129EUD#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#PBF?
For technical support, including LTC3129EUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3129EUD#PBF requirements.
6.How does Aetrix verify that LTC3129EUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3129EUD#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3129EUD#PBF?
All LTC3129EUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3129EUD#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#PBF part is unused and in its original packaging.
Return procedure for LTC3129EUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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