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Analog Devices Inc. LTC3129IMSE#TRPBF
- Part No.:
- LTC3129IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3129IMSE#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 200MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,027
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Product details
Overview
LTC3129IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous buck-boost DC/DC converter optimized for ultra-low-power energy harvesting systems. It delivers up to 200mA output current, operates from 1.92V–15V input and regulates 1.4V–15.75V output, and achieves 1.3µA quiescent current in Burst Mode - enabling multi-year battery life in wireless sensor nodes.
For engineers reviewing the LTC3129IMSE#TRPBF datasheet, LTC3129IMSE#TRPBF pinout, LTC3129IMSE#TRPBF application, or LTC3129IMSE#TRPBF 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 across VIN/VOUT combinations.
Technical Context
The LTC3129IMSE#TRPBF implements average current mode control with an internal 1.2MHz oscillator and proprietary seamless mode transition logic - eliminating sub-harmonic switching and output transients when crossing VIN = VOUT. Its four-NMOS power stage uses BST1/SW1 and BST2/SW2 bootstrapped gate drives to sustain high-side switch operation across full input range.
It integrates a dedicated MPPC comparator referenced to 1.175V (±25mV), enabling precise input voltage servoing for photovoltaic or thermoelectric sources, and features a dual-threshold RUN pin (1.22V enable, 1.16V turn-on hysteresis) for predictable start-up sequencing in low-voltage harvested-energy systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1.92V–15V after start-up; enables direct connection to single-cell LiFePO₄, multi-cell NiMH, or solar panels without pre-regulation. |
| VOUT Range | 1.4V–15.75V via external FB divider; supports 3.3V microcontrollers, 5V USB peripherals, or 12V actuators from one IC. |
| Max Output Current | 200mA in buck mode (VIN > VOUT); sufficient for BLE/Wi-Fi SoCs and analog front-ends in industrial sensors. |
| Quiescent Current | 1.3µA in Burst Mode; extends shelf life of battery-backed devices beyond 10 years at 20µA load. |
| Switching Frequency | 1.2MHz (typ); allows use of 10µH inductors & 10µF ceramic caps - reducing solution size to <40mm². |
| MPPC Input Threshold | 1.175V ±25mV; sets accurate input voltage regulation point for maximum power extraction from PV cells or TEGs. |
| RUN Pin Hysteresis | 80–120mV; prevents oscillation during brown-in/brown-out near UVLO thresholds in unstable energy sources. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm), exposed PGND pad (Pin 17) requiring soldering to PCB ground plane for thermal and electrical performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 16) | Main input supply rail | Accepts 1.92V–15V; powers internal LDO (VCC) and high-side switches; requires ≥4.7µF local ceramic decoupling. |
| VCC (Pin 1) | Internal LDO output | 4.1V regulated supply for control circuitry; can be back-driven up to 5.5V to bypass startup delay. |
| RUN (Pin 2) | Enable comparator input | Turns on VCC at 1.16V (rising), enables switching at 1.22V; hysteresis ensures clean power sequencing. |
| MPPC (Pin 3) | Maximum Power Point reference | Compares VIN-derived voltage to 1.175V; adjusts inductor current to hold source at peak power point. |
| FB (Pin 5) | Feedback node for error amplifier | Sets VOUT via resistor divider; 1.175V reference enables 1.4V–15.75V adjustment with <1% initial accuracy. |
| PWM (Pin 8) | Mode select control | Low = Burst Mode (1.3µA IQ); High = fixed 1.2MHz PWM (low-noise operation); internal 5MΩ pull-down. |
| PGOOD (Pin 9) | Open-drain status indicator | Pulls 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; requires ≥4.7µF ceramic output cap; connects to load and FB divider. |
| BST1 / BST2 (Pins 11, 13) | Floating gate drive supplies | Bootstrapped rails for high-side NMOS drivers; each requires 22nF capacitor to respective SW pin. |
| SW1 / SW2 (Pins 12, 14) | Power switch terminals | Connect to opposite ends of single inductor; must use short/wide PCB traces to minimize EMI and conduction loss. |
| PGND (Pin 13 + Exposed Pad) | Power ground return | Carries high pulsed inductor current; exposed pad must be soldered to solid ground plane for thermal dissipation. |
| GND (Pin 4) | Signal ground reference | Reference for FB, RUN, MPPC, PWM; must tie directly to PGND near IC for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost transition | Zero-output-transient mode switching eliminates voltage glitches during VIN/VOUT crossover - critical for ADC references and RF transceivers. |
| Programmable MPPC | Enables >95% power extraction from photovoltaic panels by dynamically regulating input voltage to VMPP without external controllers. |
| 1.3µA Burst Mode IQ | Reduces no-load input current to nanoampere levels - enabling operation from microwatt ambient energy harvesters (e.g., 10µW indoor light). |
| Accurate RUN threshold | 1.22V ±60mV rising threshold with 80–120mV hysteresis ensures deterministic startup from weak batteries or cold-start solar conditions. |
| Integrated loop compensation | Eliminates external compensation components - simplifies design for space-constrained IoT nodes while maintaining stability across 10:1 load range. |
Applications
| Industrial Wireless Sensor Nodes | Solar Panel Post-Regulator/Charger |
|---|---|
|
Use Scenario: Battery-less temperature/humidity node powered by indoor light harvester. IC Role / Device Role / Timing Role: Primary regulator converting 1.8–4.2V PV output to stable 3.3V for MCU and BLE radio. Use Value: 1.3µA quiescent current extends operational uptime to >5 years under 200lux illumination; MPPC maximizes harvestable energy per lux. |
Use Scenario: Outdoor solar-powered environmental monitor with Li-ion backup. IC Role / Device Role / Timing Role: Buck-boost post-regulator between solar panel and battery charger IC. Use Value: Wide 1.92V–15V input accepts partial shading or low-light conditions; 95% peak efficiency preserves marginal harvest energy. |
| Post-Regulator for Harvested Energy | Intrinsically Safe Power Supplies |
|
Use Scenario: Piezoelectric vibration harvester powering predictive maintenance sensor. IC Role / Device Role / Timing Role: Voltage stabilizer converting erratic 2–8V AC-rectified output to regulated 5V for signal conditioning. Use Value: 1.2MHz switching avoids audible noise; RUN pin hysteresis prevents cycling during intermittent vibration events. |
Use Scenario: Hazardous-area gas detector using isolated 3.3V logic powered from 24V loop supply. IC Role / Device Role / Timing Role: Secondary regulator providing low-noise 3.3V rail from isolated DC-DC output. Use Value: Burst Mode IQ limits worst-case power dissipation to <10mW - satisfying IEC 60079-11 spark-energy 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 |
|---|---|---|---|
| LTC3129EUD#TRPBF | Same silicon, 3mm × 3mm QFN package (θJA = 68°C/W vs MSOP's 40°C/W); no exposed pad thermal path in standard footprint. | Better for space-constrained layouts where thermal mass is less critical than board area. | Select when PCB real estate is premium and ambient temperature stays below 60°C. |
| LTC3129-1IMSE#TRPBF | Fixed-output variants (e.g., 3.3V, 5V); eliminates FB divider but removes VOUT adjustability and MPPC functionality. | Used in cost-sensitive, high-volume designs where output voltage is invariant and source impedance is stable. | Choose only if VOUT is fixed and MPPC is unnecessary - sacrifices flexibility for BOM reduction. |
Compared with LTC3129IMSE#TRPBF, the QFN variant trades thermal performance for smaller footprint, while the LTC3129-1 sacrifices programmability for simplicity - making the MSOP version optimal for field-deployable, adaptable energy harvesting systems requiring both wide VOUT tuning and MPPC.
Availability
LTC3129IMSE#TRPBF is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, solar-powered environmental monitors, and intrinsically safe instrumentation requiring stable component supply over extended production lifecycles.
Supply support for LTC3129IMSE#TRPBF 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 products, including rigorous AEC-Q200-aligned reliability testing and long-term product roadmaps.
The LTC3129 belongs to Linear's ultra-low-power energy harvesting regulator family, designed specifically for battery-free or battery-extending applications in remote sensing, structural monitoring, and IIoT edge nodes.
FAQ
What is the minimum input voltage required for LTC3129IMSE#TRPBF to start switching?
The LTC3129IMSE#TRPBF requires a minimum VIN of 2.42V to initiate regulation. After startup, it sustains operation down to 1.92V due to VCC back-driving capability. This two-threshold behavior enables reliable cold-start from partially discharged batteries or low-light photovoltaic sources while maintaining regulation during voltage sag.
Can LTC3129IMSE#TRPBF operate with input voltage equal to output voltage?
Yes, the LTC3129IMSE#TRPBF supports VIN = VOUT operation seamlessly. Its four-switch buck-boost topology and average current mode control eliminate discontinuities or output glitches when VIN crosses VOUT - unlike traditional SEPIC or flyback converters - making it ideal for applications like 3.3V-to-3.3V post-regulation with variable input sources.
How does the MPPC function work in LTC3129IMSE#TRPBF?
The MPPC pin in LTC3129IMSE#TRPBF compares a resistor-divided VIN to an internal 1.175V reference. When load demand exceeds source capability, the controller reduces inductor current to regulate VIN at the programmed MPP voltage - ensuring maximum power transfer from non-ideal sources like solar cells or thermoelectric generators without external MPPT circuitry.
What is the purpose of the exposed pad on the LTC3129IMSE#TRPBF MSOP package?
The exposed pad (Pin 17) on the LTC3129IMSE#TRPBF is electrically and thermally connected to PGND. It must be soldered to a PCB ground plane to achieve specified θJA = 40°C/W and prevent thermal shutdown under 200mA load. Omitting this connection raises junction temperature by >40°C at full load, risking premature failure.
Does LTC3129IMSE#TRPBF support forced PWM mode to reduce output ripple?
Yes, driving the PWM pin high (to VCC) forces continuous 1.2MHz PWM operation in LTC3129IMSE#TRPBF, eliminating Burst Mode switching artifacts. This reduces output voltage ripple to <20mVpp at 200mA load and suppresses conducted EMI - essential for noise-sensitive analog or RF circuits sharing the same power domain.
LTC3129IMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3129IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3129IMSE#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3129IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3129IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3129IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3129IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3129IMSE#TRPBF?
LTC3129IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3129IMSE#TRPBF 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#TRPBF?
For technical support, including LTC3129IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3129IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3129IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3129IMSE#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3129IMSE#TRPBF?
All LTC3129IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3129IMSE#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3129IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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