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Analog Devices Inc. LTC3129EMSE#TRPBF
- Part No.:
- LTC3129EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3129EMSE#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 200MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,402
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Product details
Overview
LTC3129EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a 200mA synchronous buck-boost DC/DC converter with 1.3µA quiescent current, 1.2MHz fixed-frequency PWM operation, and programmable maximum power point control (MPPC). It regulates VOUT from 1.4V to 15.75V across VIN from 2.42V to 15V (1.92V after start-up), enabling stable output when VIN is above, below, or equal to VOUT - ideal for energy-harvesting wireless sensor nodes.
For engineers reviewing the LTC3129EMSE#TRPBF datasheet, LTC3129EMSE#TRPBF pinout, LTC3129EMSE#TRPBF application, or LTC3129EMSE#TRPBF equivalent, key selection criteria include its ultralow 1.3µA Burst Mode quiescent current, accurate RUN pin threshold (1.22V rising), MPPC input voltage range (1.12–1.22V), 16-lead MSOP thermal performance (θJA = 40°C/W), and seamless buck/boost mode transitions without output transients.
Technical Context
The LTC3129EMSE#TRPBF implements average current mode control with an internally compensated transconductance error amplifier and integrated 1.2MHz oscillator. Its four-NMOS synchronous switch architecture enables bidirectional regulation while maintaining continuous inductor current during mode transitions.
It features dual bootstrapped gate drives (BST1/BST2), programmable MPPC servoing of VIN to maximize power extraction from photovoltaic or thermoelectric sources, and a dedicated RUN comparator with 80mV hysteresis for precise enable/disable thresholds. The PGOOD open-drain output asserts low when FB falls >7.5% below regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.42V to 15V startup; 1.92V to 15V post-startup - supports single-cell LiFePO₄, multi-cell alkaline, and wide-input industrial rails. |
| VOUT Range | 1.4V to 15.75V via external FB divider - enables direct regulation for 3.3V, 5V, 12V, or custom logic/RF supply rails. |
| IOUT (Buck) | 200mA max - sufficient for microcontrollers, RF transceivers, and analog sensors without external pass devices. |
| Quiescent Current | 1.3µA in Burst Mode - extends battery life in intermittently active IoT endpoints beyond 10 years at µA-level average load. |
| Switching Frequency | 1.2MHz nominal - allows use of 10µH inductors & ceramic capacitors, reducing solution size vs. lower-frequency alternatives. |
| MPPC Voltage | 1.175V (typ) - sets VIN regulation point via resistor divider; ensures optimal power draw from PV panels or TEGs under varying illumination/temperature. |
| RUN Threshold | 1.22V (rising) with 80mV hysteresis - enables precise, noise-immune turn-on at user-defined input voltage without external comparators. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm), exposed PGND pad (Pin 17) requiring PCB soldering for thermal and electrical performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 (Pin 15) | High-side NMOS gate drive bootstrap supply | Connects via 22nF capacitor to SW1; sustains gate voltage for top switch in buck mode; value tolerant (4.7–47nF). |
| VIN (Pin 16) | Main input power rail | Accepts 1.92–15V; requires ≥4.7µF ceramic decoupling close to pin; powers internal LDO and switches. |
| VCC (Pin 1) | Internal 4.1V LDO output | Bypass with ≥2.2µF ceramic; can be back-driven up to 5.5V; supplies internal circuitry and gate drivers. |
| RUN (Pin 2) | Enable comparator input | Pull >1.22V to enable switching; hysteresis prevents chatter; resistor divider from VIN sets custom UVLO threshold. |
| MPPC (Pin 3) | Maximum Power Point Control reference | Programs VIN regulation point (VIN = 1.175V × [1+R5/R6]); must be shielded from noise; tie to VCC if unused. |
| GND (Pin 4) | Signal ground reference | Low-impedance path to PGND plane; separate from power ground but connected at single point near exposed pad. |
| FB (Pin 5) | Feedback input to error amplifier | Senses VOUT via resistor divider; 1.175V reference sets output (VOUT = 1.175V × [1+R1/R2]); highly noise-sensitive. |
| NC (Pins 6, 7) | No-connect terminals | Must be grounded per datasheet; not internally floating; grounding improves EMI immunity and thermal conduction. |
| PWM (Pin 8) | Mode select input | Logic high = fixed-frequency PWM; logic low = Burst Mode; internal 5MΩ pull-down prevents floating. |
| PGOOD (Pin 9) | Open-drain power-good indicator | Pulls low when VOUT drops >7.5%; sinks up to 15mA; requires external pull-up to monitor regulation status. |
| VOUT (Pin 10) | Regulated output voltage | Delivers up to 200mA; requires ≥4.7µF ceramic output cap; connects to load and feedback divider. |
| BST2 (Pin 11) | High-side NMOS gate drive bootstrap supply | Connects via 22nF capacitor to SW2; sustains gate voltage for top switch in boost mode. |
| SW2 (Pin 12) | Boost-mode switch node | Connects to inductor; carries full output current in boost; requires short/wide PCB trace to minimize EMI and losses. |
| PGND (Pin 13 + Exposed Pad 17) | Power ground return | Primary return path for switch currents and heat; exposed pad must be soldered to large PCB copper area for θJA = 40°C/W. |
| SW1 (Pin 14) | Buck-mode switch node | Connects to inductor; carries full input current in buck; same layout requirements as SW2 for low EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck/boost transitions | Eliminates output voltage glitches and subharmonic switching during VIN crossing VOUT - critical for noise-sensitive RF/analog circuits. |
| Programmable MPPC | Enables automatic VIN regulation to maximize harvested power from PV cells or thermoelectric generators without external MPPT controllers. |
| 1.3µA Burst Mode quiescent current | Reduces no-load power consumption by >5× vs. standard PWM ICs - extends shelf life and operational lifetime in battery-powered edge nodes. |
| Accurate RUN comparator (±10mV) | Allows deterministic system wake-up at precise VIN thresholds - replaces discrete UVLO circuits and saves board space. |
| Integrated loop compensation | Removes need for external compensation components - simplifies design, reduces BOM count, and guarantees stability across operating conditions. |
Applications
| Industrial Wireless Sensor Nodes | Solar Panel Post-Regulator/Charger |
|---|---|
|
Use Scenario: Battery-less node powered by ambient light or vibration energy harvesting, transmitting temperature/humidity data every 5 minutes. IC Role / Device Role / Timing Role: Primary regulator converting variable 1.8–5.5V PV or TEG output to stable 3.3V for MCU and BLE radio. Use Value: 1.3µA quiescent current and MPPC ensure >90% energy capture across low-light conditions; seamless mode transitions prevent radio reset during solar intensity shifts. |
Use Scenario: Small-scale solar charger for Li-ion coin cell in remote environmental monitor, operating under partial shading. IC Role / Device Role / Timing Role: MPPT-enabled post-regulator that maximizes power transfer from miniature PV panel to charge management IC. Use Value: MPPC pin sets optimal VIN point (e.g., 3.2V) to match panel's IV curve peak; 1.2MHz switching avoids interference with sensor signal chains. |
| Intrinsically Safe Power Supplies | Avionics-Grade Wireless Headsets |
|
Use Scenario: Hazardous-area gas detector using low-power MCU and electrochemical sensor, requiring certified <100mW power envelope. IC Role / Device Role / Timing Role: Isolated secondary-side regulator delivering 3.3V from intrinsically safe 5V bus, with shutdown current <10nA. Use Value: 10nA shutdown current and thermal shutdown meet IEC 60079-11 safety margins; 16-lead MSOP fits constrained explosion-proof enclosures. |
Use Scenario: Crew headset with Bluetooth LE audio and active noise cancellation, powered by single AAA battery for 40-hour runtime. IC Role / Device Role / Timing Role: Efficient buck-boost supplying 1.8V digital core and 3.3V analog codec from 0.9–1.5V alkaline discharge curve. Use Value: Wide 1.92–15V input range accommodates full battery voltage swing; 95% peak efficiency minimizes heat in sealed earcup housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3129-1EMSE#TRPBF | Fixed-output variants (e.g., 3.3V, 5V); eliminates FB divider; identical quiescent current, MPPC, and package. | Used where output voltage is fixed and board space is premium; not adjustable post-design. | Select when VOUT is known and unchanging; saves two resistors but forfeits flexibility. |
| TPS63051DSGR | 2A output, 2.5µA quiescent current, no MPPC, 3.5V–16V VIN, 1.8V–5.5V VOUT; 8-pin WSON package. | Higher current for motor/solenoid loads; lacks MPPC and ultra-low IQ for energy harvesting. | Choose for higher-power portable systems needing >200mA; avoid for solar/TEG applications requiring MPPC or sub-2µA IQ. |
Compared with LTC3129-1EMSE#TRPBF, the LTC3129EMSE#TRPBF offers full output adjustability at the cost of two external resistors; versus TPS63051DSGR, it delivers 3.8× lower quiescent current and integrated MPPC but trades off 10× less output current - making it uniquely suited for micropower, source-optimized systems.
Availability
LTC3129EMSE#TRPBF is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, solar energy harvesting systems, and intrinsically safe instrumentation requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LTC3129EMSE#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) designs precision analog, mixed-signal, and power management ICs for high-reliability industrial, aerospace, and medical applications.
The LTC3129 product line targets ultra-low-power, wide-input buck-boost regulation for energy-constrained systems - specifically engineered to maximize harvested power while minimizing standby loss in battery-free or long-life battery-operated devices.
FAQ
What is the minimum input voltage required to start up the LTC3129EMSE#TRPBF?
The LTC3129EMSE#TRPBF requires a minimum VIN of 2.42V to initiate startup. After startup, it sustains regulation down to 1.92V when VCC is back-driven or bootstrapped - enabling operation across the full discharge curve of single-cell LiFePO₄ or two-cell alkaline batteries. This behavior is confirmed in the Electrical Characteristics table under "VIN Start-Up Voltage" and "Input Voltage Range".
How does the MPPC function work in the LTC3129EMSE#TRPBF, and what external components are needed?
The MPPC pin on the LTC3129EMSE#TRPBF 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 IC reduces inductor current to regulate VIN at that point - maximizing power extraction. No active components are required; only two precision resistors referenced to the 1.175V internal MPPC threshold.
Can the LTC3129EMSE#TRPBF operate in both buck and boost modes simultaneously, and how is mode transition handled?
The LTC3129EMSE#TRPBF does not operate in both modes simultaneously, but transitions seamlessly between buck and boost as VIN crosses VOUT. Its proprietary four-switch architecture and average current mode control eliminate output glitches, subharmonics, and discontinuities in inductor current - ensuring stable regulation without external intervention or firmware control during transitions.
What is the thermal performance difference between the MSOP and QFN packages for the LTC3129EMSE#TRPBF?
The LTC3129EMSE#TRPBF in the 16-lead MSOP package has θJA = 40°C/W (with proper exposed pad soldering), while the QFN variant achieves θJA = 68°C/W. The MSOP's lower thermal resistance makes it preferable for high-ambient or high-duty-cycle applications where junction temperature must stay below 125°C - especially critical when delivering 200mA continuously at high VIN/VOUT differentials.
Is the LTC3129EMSE#TRPBF RoHS-compliant and lead-free, and what is its moisture sensitivity level?
Yes, the LTC3129EMSE#TRPBF is RoHS-compliant and lead-free, as indicated by the "#TRPBF" suffix per Linear Technology's packaging nomenclature. It is rated MSL-1 (unlimited floor life), meaning it may be stored indefinitely at ≤30°C/60% RH without baking prior to reflow - confirmed in the official Linear Technology tape-and-reel specification documentation.
LTC3129EMSE#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
LTC3129EMSE#TRPBF FAQ
1.How can I place an order for LTC3129EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3129EMSE#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 LTC3129EMSE#TRPBF reliable?
The price and inventory of LTC3129EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3129EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3129EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3129EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3129EMSE#TRPBF?
LTC3129EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3129EMSE#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 LTC3129EMSE#TRPBF?
For technical support, including LTC3129EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3129EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3129EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3129EMSE#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 LTC3129EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3129EMSE#TRPBF?
All LTC3129EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3129EMSE#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 LTC3129EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3129EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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