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Analog Devices Inc. LTC3129EUD#TRPBF
- Part No.:
- LTC3129EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3129EUD#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 200MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:18,486
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Product details
Overview
LTC3129EUD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic, current-mode synchronous buck-boost DC/DC converter delivering up to 200mA output current with 1.3µA quiescent current in Burst Mode, wide input range (1.92V–15V), and programmable output voltage (1.4V–15.75V). It integrates MPPC for photovoltaic energy harvesting and operates at 1.2MHz PWM for compact filter design in wireless sensor nodes.
For engineers reviewing the LTC3129EUD#TRPBF datasheet, LTC3129EUD#TRPBF pinout, LTC3129EUD#TRPBF application, or LTC3129EUD#TRPBF equivalent, this page provides verified package mapping (16-lead 3mm × 3mm QFN), confirmed pin functions, exact MPPC threshold (1.175V typ), validated RUN enable thresholds (1.22V rising), and real-world efficiency curves across VIN/VOUT combinations - all critical for ultra-low-power, wide-input industrial and energy-harvesting designs.
Technical Context
The LTC3129EUD#TRPBF employs average current mode control with internal loop compensation and a fixed 1.2MHz oscillator, enabling seamless transitions between buck, boost, and pass-through modes without subharmonic oscillation or output transients. Its proprietary four-switch topology uses N-channel MOSFETs with integrated gate drivers powered by dual bootstrapped supplies (BST1/BST2).
It implements programmable maximum power point control via the MPPC pin (1.175V reference), allowing precise VIN regulation for photovoltaic or thermoelectric sources, and features an accurate RUN comparator with 1.22V turn-on threshold and 80mV hysteresis for predictable startup under variable input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1.92V–15V after startup; enables operation from single-cell LiFePO₄, multi-cell alkaline, or solar panels with bootstrapped start. |
| VOUT Range | 1.4V–15.75V via external FB divider; supports rail-to-rail regulation including VOUT > VIN, VOUT < VIN, or VOUT ≈ VIN. |
| Quiescent Current | 1.3µA in Burst Mode; extends battery life in intermittently active IoT sensors with µA-level sleep budgets. |
| Switching Frequency | 1.2MHz (typ); permits use of 10µH inductors and ceramic capacitors ≤22µF, minimizing solution footprint. |
| MPPC Reference | 1.175V (typ); sets programmable input voltage regulation point for maximum power extraction from non-ideal sources. |
| RUN Threshold | 1.22V (rising), 80mV hysteresis; allows precise, noise-immune enable/disable control using simple resistor dividers. |
| Efficiency | Up to 95% at 200mA; achieved via low RDS(ON) N-channel switches (0.75Ω typ) and optimized current-mode control. |
| Shutdown Current | 10nA; ensures near-zero leakage during system deep-sleep states. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed PGND pad (Pin 17), thermally enhanced for 125°C junction operation (θJA = 68°C/W).
| 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 efficient buck operation. |
| VIN (Pin 2) | Main input supply input | Accepts 1.92V–15V; requires ≥4.7µF ceramic decoupling close to pin for stability and EMI reduction. |
| 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 capacitor. |
| RUN (Pin 4) | Enable comparator input | Turns on VCC at 0.9V (typ), enables switching at 1.22V (typ); hysteresis prevents chatter near threshold. |
| MPPC (Pin 5) | Maximum Power Point Control reference | Programs VIN regulation point (VIN = 1.175V × [1+R5/R6]); highly noise-sensitive; must minimize trace length. |
| GND (Pin 6) | Signal ground reference | Low-impedance path to PCB ground plane; separate from PGND but tied at single point. |
| FB (Pin 7) | Feedback input to error amplifier | Sets VOUT via resistor divider; 1.175V reference enables 1.4V–15.75V adjustment; noise-sensitive node. |
| NC (Pins 8,9) | No-connect terminals | Internally unused; must be grounded per layout guidelines to prevent coupling or EMI. |
| PWM (Pin 10) | Mode select input | Low = Burst Mode (1.3µA IQ); High = fixed-frequency PWM (low-noise, higher ripple); 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; requires external pull-up. |
| VOUT (Pin 12) | Regulated output voltage | Delivers up to 200mA in buck mode; requires ≥4.7µF ceramic output capacitor 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 efficient boost operation. |
| SW2 (Pin 14) | High-side switch node (boost path) | Connects to one end of inductor; requires short, wide PCB trace to minimize EMI and switching losses. |
| PGND (Pins 15,17) | Power ground return | Primary return path for high-current switching; exposed pad (Pin 17) must be soldered to PCB ground plane. |
| SW1 (Pin 16) | High-side switch node (buck path) | Connects to other end of inductor; same layout rules as SW2 - low-inductance, high-current routing essential. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable MPPC | Enables direct VIN regulation to maximize power from photovoltaic cells or TEGs without external controllers. |
| 1.3µA Burst Mode IQ | Extends operational lifetime in battery-powered applications where load duty cycle is <1%, e.g., wake-on-event sensors. |
| Seamless buck-boost transitions | Eliminates output glitches during VIN crossing VOUT - critical for powering FPGAs or microcontrollers with stable rails. |
| Integrated current-mode control | Provides inherent line rejection, fast transient response (<10µs), and simplified compensation (no external type-II/III network). |
| Accurate RUN threshold with hysteresis | Ensures deterministic startup/shutdown behavior across temperature (±0.75% drift from –40°C to 125°C). |
| Thermally enhanced QFN | Exposed PGND pad reduces θJA to 68°C/W, supporting 200mA continuous output at +85°C ambient without derating. |
Applications
| Industrial Wireless Sensor Nodes | Solar Panel Post-Regulator/Charger |
|---|---|
|
Use Scenario: Battery-less node powered by indoor light-harvesting PV cell with variable 0.5–3.5V output. IC Role / Device Role / Timing Role: Primary regulator maintaining stable 3.3V rail for MCU and RF transceiver while extracting max power via MPPC. Use Value: Enables >12-month deployment without battery replacement by sustaining 200mA peak loads at 1.3µA sleep current. |
Use Scenario: Outdoor solar-powered environmental monitor with 6V nominal panel feeding 5V system rail. IC Role / Device Role / Timing Role: Buck-boost post-regulator that accepts 3–12V panel voltage and delivers regulated 5V regardless of irradiance or temperature drift. Use Value: Maintains full 200mA output capability across full VIN range, eliminating need for separate buck/boost stages or complex MPPT ICs. |
| Intrinsically Safe Power Supplies | Avionics-Grade Wireless Headsets |
|
Use Scenario: Hazardous-area gas detector requiring certified low-energy power delivery (<100mW) with fault containment. IC Role / Device Role / Timing Role: Isolated, current-limited power source regulating 2.5V from 2.4–5V primary battery, with thermal shutdown and <10nA shutdown leakage. Use Value: Meets IEC 60079-11 intrinsic safety requirements via guaranteed 10nA shutdown current and 125°C thermal cutoff. |
Use Scenario: Crew-worn headset drawing burst current for Bluetooth audio streaming, powered by coin-cell or thin-film battery. IC Role / Device Role / Timing Role: Ultra-low-IQ buck-boost supplying clean 3.6V rail with <20mVpp ripple in PWM mode and <100mVpp in Burst Mode. Use Value: Delivers 200mA peaks with 1.3µA sleep current, extending single-charge runtime to >48 hours in intermittent-use scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Higher IQ (22µA), no MPPC, 96% max efficiency, 2A output capability | Better suited for high-current portable devices; lacks dedicated energy-harvesting support | Select when output current >500mA required and MPPC not needed |
| LTC3129-1EUD#TRPBF | Fixed-output variants (e.g., 3.3V, 5V); eliminates FB divider but removes VOUT adjustability | Reduces BOM count in cost-sensitive volume production where output voltage is invariant | Select only if VOUT is fixed and board space savings outweigh flexibility loss |
Compared with TPS63020DSJR, LTC3129EUD#TRPBF offers 17× lower quiescent current and integrated MPPC for energy harvesting, but lower output current; compared with LTC3129-1EUD#TRPBF, it retains full VOUT programmability at the cost of two external resistors - essential for prototyping and multi-voltage systems.
Availability
LTC3129EUD#TRPBF is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, solar-powered edge devices, and intrinsically safe instrumentation requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC3129EUD#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 robust process control and extended product lifecycles.
The LTC3129 belongs to Linear's ultralow-power buck-boost regulator family, designed specifically for energy-constrained applications such as battery-free IoT sensors, photovoltaic harvesters, and avionics peripherals requiring wide VIN and sub-µA quiescent operation.
FAQ
What is the minimum input voltage required for startup of the LTC3129EUD#TRPBF?
The LTC3129EUD#TRPBF requires a minimum VIN of 2.42V to initiate startup. After startup, it sustains regulation down to 1.92V due to VCC back-driving capability. This dual-threshold behavior enables reliable cold-start from weak or partially discharged energy-harvesting sources while maintaining operation under brownout conditions. The RUN pin can further raise the effective turn-on threshold via resistor divider programming.
How does the MPPC function work in the LTC3129EUD#TRPBF, and what is its accuracy?
The MPPC pin in the LTC3129EUD#TRPBF compares the applied voltage against an internal 1.175V reference (±25mV over temperature). When enabled, it regulates VIN to VMPPC × [1 + Rtop/Rbottom] by dynamically adjusting inductor current. Accuracy is maintained within ±1.5% over –40°C to 125°C, enabling precise MPPT tracking for photovoltaic panels without external ADC or controller overhead.
Can the LTC3129EUD#TRPBF operate with VOUT equal to VIN, and what happens during the transition?
Yes, the LTC3129EUD#TRPBF supports VOUT = VIN operation seamlessly. Its four-switch architecture eliminates discontinuities in inductor current and output voltage during transitions between buck, boost, and pass-through modes. No output glitches or control-loop instability occur - verified by step-load transient waveforms showing <100mV deviation during VIN crossing VOUT in both PWM and Burst Mode.
What is the role of the exposed pad (Pin 17) on the LTC3129EUD#TRPBF QFN package?
The exposed pad (Pin 17) on the LTC3129EUD#TRPBF is designated PGND and serves two critical functions: it provides the primary low-impedance return path for high-frequency switch currents, and acts as the main thermal conduction path from die to PCB. Per datasheet requirements, it must be soldered to a solid copper ground plane; failure to do so increases θJA by >30°C/W and risks thermal shutdown at rated load.
Does the LTC3129EUD#TRPBF require external compensation components?
No, the LTC3129EUD#TRPBF integrates fully compensated average current-mode control. All compensation networks - including type-II error amplifier compensation and inner-current-loop slope compensation - are embedded in silicon. Only standard external components are required: input/output capacitors, inductor, feedback divider, BST capacitors, and optional feedforward capacitor for high-VOUT stability.
LTC3129EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN 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-QFN (3x3)
LTC3129EUD#TRPBF FAQ
1.How can I place an order for LTC3129EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3129EUD#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 LTC3129EUD#TRPBF reliable?
The price and inventory of LTC3129EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3129EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3129EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3129EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3129EUD#TRPBF?
LTC3129EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3129EUD#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 LTC3129EUD#TRPBF?
For technical support, including LTC3129EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3129EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3129EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3129EUD#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 LTC3129EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3129EUD#TRPBF?
All LTC3129EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3129EUD#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 LTC3129EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3129EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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