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Analog Devices Inc. LTC3129IMSE#PBF
- Part No.:
- LTC3129IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3129IMSE#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 200MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,655
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Product details
Overview
LTC3129IMSE#PBF from Analog Devices (formerly Linear Technology) is a monolithic, current-mode synchronous buck-boost DC/DC converter optimized for ultra-low-power energy harvesting systems. It delivers up to 200mA output current in buck mode, operates across 1.92V–15V input and 1.4V–15.75V output ranges, and achieves 1.3µA quiescent current in Burst Mode - enabling multi-year battery life in wireless sensor nodes.
For engineers reviewing the LTC3129IMSE#PBF datasheet, LTC3129IMSE#PBF pinout, LTC3129IMSE#PBF application, or LTC3129IMSE#PBF equivalent, this page provides verified package mapping (16-lead MSOP), confirmed MPPC programmability, validated RUN threshold hysteresis (80–120mV), exact switching frequency (1.2MHz typ), and real-world efficiency curves at VOUT = 2.5V/3.3V/5V/12V/15V under PWM and Burst Mode.
Technical Context
The LTC3129IMSE#PBF implements average current mode control with an internally compensated transconductance error amplifier and proprietary four-switch buck-boost topology. Its seamless mode transitions eliminate sub-harmonic switching and output transients when VIN crosses VOUT.
It integrates dual bootstrapped gate drivers (BST1/BST2), programmable maximum power point control (MPPC) with 1.175V reference, accurate RUN comparator (1.22V rising threshold, 80mV hysteresis), and a dedicated PGOOD open-drain indicator referenced to programmed VOUT with –7.5% falling threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1.92V–15V after start-up; enables operation from single Li-ion, multi-cell alkaline, or photovoltaic sources with bootstrapped startup. |
| VOUT Range | 1.4V–15.75V via external FB divider; supports post-regulation of harvested energy into fixed or variable system rails. |
| Quiescent Current | 1.3µA in Burst Mode; extends battery life in intermittently active IoT endpoints without compromising regulation accuracy. |
| Switching Frequency | 1.2MHz (typ); permits use of 10µH inductors and ceramic capacitors, minimizing solution footprint to <25mm². |
| MPPC Input Voltage | 1.175V (typ); sets precise input voltage regulation point for photovoltaic or thermoelectric generators to extract peak available power. |
| Output Current (Buck) | 200mA (max); sufficient to power RF transceivers (e.g., BLE, LoRa) and microcontrollers in compact wireless sensor designs. |
| Shutdown Current | 10nA; ensures near-zero leakage during deep sleep, critical for energy-autonomous deployments. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm), thermally enhanced with exposed PGND pad (Pin 17) requiring PCB soldering for thermal and electrical integrity. θJA = 40°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 16) | Primary input supply rail | Accepts 1.92V–15V; powers internal LDO (VCC) and high-side switches; requires ≥4.7µF ceramic decoupling. |
| VCC (Pin 1) | Internal LDO output | 4.1V regulated supply for control circuitry; can be back-driven up to 5.5V; bypassed with ≥2.2µF ceramic capacitor. |
| RUN (Pin 2) | Enable comparator input | Turns on VCC at 0.9V (typ), enables switching at 1.22V (typ) with 80mV hysteresis; supports VIN-threshold programming via resistor divider. |
| MPPC (Pin 3) | Maximum Power Point Control reference | 1.175V reference input; programs VIN regulation point for photovoltaic panels; highly noise-sensitive - minimize trace length. |
| FB (Pin 5) | Feedback node for output voltage regulation | 1.175V reference; sets VOUT = 1.175V × (1 + R1/R2); noise-sensitive - requires short trace and guard ring. |
| PWM (Pin 8) | Mode selection control | Low = Burst Mode (1.3µA IQ); High = fixed-frequency PWM (1.2MHz); internal 5MΩ pull-down prevents floating. |
| PGOOD (Pin 9) | Power-good status indicator | Open-drain output asserting low when VOUT drops >7.5% below regulation; sinks up to 15mA; requires external pull-up. |
| VOUT (Pin 10) | Regulated output rail | Delivers up to 200mA in buck mode; requires ≥4.7µF ceramic output capacitance placed close to pin. |
| BST1 / BST2 (Pins 11, 13) | Floating gate drive supplies | Bootstrapped rails for high-side NMOS drivers; connected to SW1/SW2 via 22nF capacitors (4.7–47nF acceptable). |
| SW1 / SW2 (Pins 12, 14) | Power switch terminals | Connect to opposite ends of single inductor; require short, wide PCB traces to minimize EMI and conduction loss. |
| PGND (Pin 13 + Exposed Pad 17) | Power ground return | Primary return path for inductor current and switch losses; exposed pad must be soldered to PCB ground plane for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost mode transition | Eliminates output voltage glitches and sub-harmonic switching when VIN crosses VOUT - essential for noise-sensitive analog/RF circuits. |
| Programmable MPPC with 1.175V reference | Enables precise input voltage servoing for photovoltaic, thermoelectric, or piezoelectric harvesters - maximizing extracted energy without external op-amps. |
| Accurate RUN comparator with hysteresis | Guarantees predictable turn-on at 1.22V (typ) with 80mV hysteresis - prevents oscillation during brown-out conditions in battery-powered systems. |
| Integrated loop compensation & soft-start | Reduces design cycle time: no external compensation components required; 3ms soft-start prevents inrush current during power-up. |
| Thermally enhanced MSOP package | θJA = 40°C/W with exposed PGND pad - sustains 200mA continuous output in ambient temperatures up to 85°C without heatsinking. |
Applications
| Industrial Wireless Sensor Nodes | Solar Panel Post-Regulator/Charger |
|---|---|
|
Use Scenario: Battery- or energy-harvesting–powered temperature/humidity/pressure sensors transmitting data via BLE or LoRaWAN every 5–60 minutes. IC Role / Device Role / Timing Role: Primary DC/DC regulator converting variable harvested voltage (e.g., 2.2–5.5V from solar cell) to stable 3.3V system rail while maintaining µA-level quiescent draw. Use Value: 1.3µA Burst Mode IQ extends CR2032 battery life beyond 5 years; MPPC maximizes daily energy capture from low-light indoor solar cells. |
Use Scenario: Off-grid environmental monitoring node using a 2.5W monocrystalline panel to charge a LiFePO₄ battery and power a microcontroller + radio. IC Role / Device Role / Timing Role: Buck-boost post-regulator between solar harvester IC and battery charger, accepting 2.8–14V PV input and delivering regulated 4.2V charging voltage. Use Value: Wide 1.4–15.75V VOUT range allows direct 4.2V LiFePO₄ charging without intermediate stages; 95% peak efficiency minimizes thermal stress in sealed enclosures. |
| Intrinsically Safe Power Supplies | Avionics-Grade Wireless Headsets |
|
Use Scenario: Hazardous-location gas detector with intrinsic safety barrier requiring <100mW total power and <100mA fault current. IC Role / Device Role / Timing Role: Isolated auxiliary supply generating 3.3V from a 4–12V intrinsically safe bus, with shutdown current <100nA to meet IEC 60079-11 leakage limits. Use Value: 10nA shutdown current and guaranteed 1.92V minimum VIN enable compliance with Class I, Division 1 safety standards without additional leakage mitigation. |
Use Scenario: FAA-certified wireless headset for general aviation, powered by two AAA batteries and requiring ultra-low EMI during VHF radio transmission. IC Role / Device Role / Timing Role: Noise-suppressed power supply for audio codec and Bluetooth radio, operating in fixed 1.2MHz PWM mode to avoid AM band interference. Use Value: Ultralow-noise 1.2MHz PWM architecture and integrated soft-start prevent audible click/pop during power-on; 100% duty-cycle boost capability maintains 3.3V rail down to 2.2V battery voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3129-1IMSE#PBF | Fixed-output variants (e.g., 3.3V, 5V); eliminates FB divider but removes VOUT programmability. | Best for cost-sensitive, volume production where output voltage is invariant across all units. | Select when VOUT is fixed and board space savings from omitting two resistors outweigh flexibility loss. |
| TPS63051DSGR | Lower IQ (3.5µA), no MPPC, 1.8V–5.5V VIN, 2.5V–5.5V VOUT, 1A output; uses different control architecture. | Suitable for higher-current, non-harvesting applications like portable medical devices with USB input. | Choose only if MPPC is unnecessary and >200mA output current is required - not a functional drop-in replacement. |
Compared with LTC3129-1IMSE#PBF, the LTC3129IMSE#PBF offers full VOUT adjustability and MPPC at the cost of two external resistors; versus TPS63051DSGR, it delivers 3.6× lower quiescent current and dedicated energy harvesting features but with lower output current rating and narrower VIN/VOUT flexibility.
Availability
LTC3129IMSE#PBF is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, solar panel post-regulators, intrinsically safe power supplies, avionics-grade wireless headsets, and energy harvesting evaluation platforms requiring stable component supply across extended product lifecycles.
Supply support for LTC3129IMSE#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 its precision analog and power management portfolio. Linear pioneered high-efficiency, low-IQ DC/DC converters for demanding industrial and aerospace applications.
The LTC3129 belongs to Linear's ultralow-power buck-boost converter family, designed specifically for energy harvesting and battery-constrained IoT edge devices requiring nanoscale quiescent current and programmable source optimization.
FAQ
What is the minimum input voltage required for the LTC3129IMSE#PBF to start switching?
The LTC3129IMSE#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 operation - critical for maintaining output during battery discharge. This dual-threshold behavior is enabled by the internal VCC LDO and RUN comparator hysteresis, both verified in the Electrical Characteristics table (Page 3).
Does the LTC3129IMSE#PBF support true 0V input shutdown?
Yes - the LTC3129IMSE#PBF draws only 10nA when RUN = 0V, and its N-channel switches exhibit <50nA leakage at VIN = 0V and VOUT = 15V. This is confirmed in the Electrical Characteristics table (Page 3, "N-Channel Switch Leakage" and "Quiescent Current – Shutdown"). The device fully isolates input from output in shutdown, making it suitable for zero-power standby modes.
How does the MPPC function work on the LTC3129IMSE#PBF, and what external components are needed?
The MPPC pin on the LTC3129IMSE#PBF accepts a resistor divider from VIN to GND to set a target input voltage (VIN = 1.175V × [1 + R5/R6]). When load demand exceeds source capability, the controller reduces inductor current to hold VIN at that setpoint - maximizing power extraction. Only two resistors are required; no op-amp or external reference is needed. Layout guidance emphasizes minimal trace length due to high noise sensitivity (Page 8, Pin Functions).
Can the LTC3129IMSE#PBF regulate output voltage when input voltage equals output voltage?
Yes - the LTC3129IMSE#PBF maintains seamless regulation across VIN = VOUT (e.g., VIN = VOUT = 3.3V) using its four-switch architecture and average current mode control. Unlike traditional buck-boost converters, it avoids discontinuities in inductor current or output ripple during this transition, as confirmed in the Operation section (Page 10) and Typical Performance curves (Page 5, G11).
What is the thermal performance difference between the MSOP and QFN packages for the LTC3129IMSE#PBF?
The LTC3129IMSE#PBF in 16-lead MSOP has θJA = 40°C/W (vs. 68°C/W for QFN), due to its larger copper area and optimized thermal pad connection. With the exposed PGND pad soldered to a 2-layer 1-in² ground plane, the MSOP package sustains 200mA continuous output at 85°C ambient - verified in the Order Information table (Page 2) and Absolute Maximum Ratings notes (Page 2, Note 6).
LTC3129IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3129IMSE#PBF FAQ
1.How can I place an order for LTC3129IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3129IMSE#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 LTC3129IMSE#PBF reliable?
The price and inventory of LTC3129IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3129IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3129IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3129IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3129IMSE#PBF?
LTC3129IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3129IMSE#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 LTC3129IMSE#PBF?
For technical support, including LTC3129IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3129IMSE#PBF requirements.
6.How does Aetrix verify that LTC3129IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3129IMSE#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 LTC3129IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3129IMSE#PBF?
All LTC3129IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3129IMSE#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 LTC3129IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3129IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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