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Analog Devices Inc. LTC3129EUD-1#TRPBF
- Part No.:
- LTC3129EUD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3129EUD-1#TRPBF.pdf
- Description:
- IC REG BUCK BST PROG 200MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,249
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Product details
Overview
LTC3129EUD-1#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 eight user-selectable fixed output voltages (2.5V to 15V). It features maximum power point control (MPPC), accurate RUN pin threshold (1.22V typ), and seamless mode transitions-ideal for energy-harvesting systems powered by photovoltaic panels or low-voltage batteries.
For engineers reviewing the LTC3129EUD-1#TRPBF datasheet, LTC3129EUD-1#TRPBF pinout, LTC3129EUD-1#TRPBF application, or LTC3129EUD-1#TRPBF equivalent, key selection criteria include its ultralow IQ in Burst Mode, MPPC programmability for solar input regulation, 1.92V–15V input range after startup, thermally enhanced 3mm × 3mm QFN package, and internal voltage divider eliminating external feedback resistors.
Technical Context
The LTC3129EUD-1#TRPBF employs average current mode control with an internally compensated transconductance amplifier and a 1.2MHz oscillator, enabling stable regulation across buck, boost, and pass-through modes without subharmonic oscillation or output transients. Its proprietary four-switch topology uses internal N-channel MOSFETs with RDS(ON) ≤ 0.75Ω and supports seamless transitions between operating modes regardless of VIN/VOUT relationship.
It integrates MPPC functionality via a precision 1.175V reference on the MPPC pin, allowing servo control of input voltage to maximize power extraction from non-ideal sources. The RUN pin provides hysteresis (80mV typ) and dual-threshold enable logic (1.16V to start VCC, 1.22V to enable switching), while the PWM pin selects between Burst Mode (1.3µA IQ) and fixed-frequency PWM operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.92V to 15V after startup; enables operation from single AA/AAA cells or wide-input industrial rails. |
| Output Current | 200mA in buck mode; sufficient for wireless sensor nodes, low-power microcontrollers, and analog front-ends. |
| Quiescent Current | 1.3µA in Burst Mode; extends battery life in intermittently active IoT endpoints. |
| Switching Frequency | 1.2MHz nominal; allows use of compact 10µH inductors and ceramic capacitors for minimal PCB footprint. |
| Fixed Output Voltages | Eight factory-programmable settings (2.5V–15V) via VS1/VS2/VS3 pins; eliminates external feedback network and improves accuracy. |
| MPPC Reference | 1.175V ±25mV; enables precise input voltage regulation for maximum power transfer from PV cells or thermoelectric generators. |
| Efficiency | Up to 95%; achieved via low-RDS(ON) internal switches and optimized gate drive architecture. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed PGND pad (Pin 17), rated for –40°C to 125°C junction temperature. Thermal resistance θJA = 68°C/W (with proper PCB thermal pad connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 (Pin 1) | High-side NMOS gate drive supply for SW1 | Must be connected to SW1 via 22nF capacitor; enables efficient bootstrapped drive of top switch in buck mode. |
| VIN (Pin 2) | Main input power supply | 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) | Supplies internal circuitry; can be back-driven up to 5.5V; bypass with ≥2.2µF ceramic capacitor. |
| RUN (Pin 4) | Enable comparator input | 1.22V rising threshold enables switching; hysteresis ensures clean turn-on/turn-off; resistor divider sets custom VIN start point. |
| MPPC (Pin 5) | Maximum Power Point Control reference input | Connects to resistor divider from VIN; regulates input voltage to 1.175V × (1 + R5/R6) for optimal harvested power. |
| GND (Pin 6) | Signal ground reference | Must connect directly to PCB ground plane; separate from PGND path to minimize noise coupling. |
| VS3 (Pin 7) | Output voltage select bit 2 | Digital input (0 or VCC) selecting one of eight fixed VOUT values per Table 1; must not float. |
| VS2 (Pin 8) | Output voltage select bit 1 | Digital input (0 or VCC); combined with VS1/VS3, determines final regulated output voltage. |
| VS1 (Pin 9) | Output voltage select bit 0 | Digital input (0 or VCC); three-bit encoding defines VOUT from 2.5V to 15V in discrete steps. |
| PWM (Pin 10) | Mode selection control | Low = Burst Mode (1.3µA IQ); High = fixed 1.2MHz PWM; internal 5MΩ pull-down prevents floating. |
| PGOOD (Pin 11) | Open-drain power-good indicator | Asserts low when VOUT drops >7.5% below programmed value; sinks up to 15mA; requires external pull-up. |
| VOUT (Pin 12) | Regulated output voltage | Delivers selected fixed voltage (e.g., 5V, 8.2V); requires ≥4.7µF ceramic output capacitor for stability. |
| BST2 (Pin 13) | High-side NMOS gate drive supply for SW2 | Must be connected to SW2 via 22nF capacitor; enables efficient bootstrapped drive of top switch in boost mode. |
| SW2 (Pin 14) | Boost-mode switch node | Connects to inductor; short/wide PCB trace minimizes EMI and conduction losses during boost operation. |
| PGND (Pin 15 / Exposed Pad Pin 17) | Power ground return | Primary return path for high-current switching; exposed pad must be soldered to PCB ground plane for thermal and electrical performance. |
| SW1 (Pin 16) | Buck-mode switch node | Connects to inductor; same layout requirements as SW2; carries peak inductor current in buck configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Eight fixed-output voltage options | Eliminates external feedback resistors and associated tolerance errors; improves long-term output accuracy and reduces BOM count. |
| 1.3µA Burst Mode quiescent current | Extends operational lifetime in battery-powered applications where load duty cycle is low (e.g., periodic sensor wake-ups). |
| Programmable MPPC with 1.175V reference | Enables direct interface with photovoltaic panels or other variable-source harvesters without external op-amps or ADCs. |
| Accurate RUN pin with 80mV hysteresis | Allows reliable cold-start from weak batteries and prevents oscillation near UVLO threshold during brown-out conditions. |
| Seamless buck/boost/pass-through transitions | Prevents output glitches or discontinuities during VIN crossing VOUT-critical for noise-sensitive RF and audio subsystems. |
| Thermally enhanced QFN with exposed PGND pad | Reduces thermal resistance by >50% vs. standard MSOP; supports continuous 200mA output at elevated ambient temperatures. |
Applications
| Solar-Powered Wireless Sensor Node | Post-Regulator for Energy Harvesting |
|---|---|
Use Scenario: Indoor/outdoor environmental monitoring using photovoltaic mini-panel and ultra-low-power MCU. IC Role / Device Role / Timing Role: Buck-boost regulator providing stable 3.3V from 2.2V–5.5V PV input; MPPC maximizes harvested power under varying light. Use Value: Enables >3-year battery-free operation; 1.3µA IQ preserves charge during dark periods; seamless mode transitions prevent MCU resets. |
Use Scenario: Powering BLE beacon from thermoelectric generator (TEG) with <100mV open-circuit voltage. IC Role / Device Role / Timing Role: Step-up regulator converting 0.5V–2.5V TEG output to regulated 5V; RUN pin disables converter until sufficient input voltage is available. Use Value: Eliminates need for external charge pump or boost controller; internal switches reduce solution size and component count. |
| Intrinsically Safe Portable Instrument | Avionics-Grade Wireless Headset |
Use Scenario: Handheld gas detector certified for hazardous locations with strict power-limiting requirements. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering 5V from two AAA cells; shutdown current <10nA ensures compliance with IEC 60079-11. Use Value: Meets Class I, Division 1 safety standards; 10nA shutdown current prevents thermal runaway in fault conditions. |
Use Scenario: Low-noise aviation headset requiring clean 3.3V rail for RF transceiver and MEMS microphone. IC Role / Device Role / Timing Role: Post-regulator filtering ripple from aircraft 28V bus; fixed-frequency PWM mode suppresses conducted EMI in sensitive avionics bands. Use Value: 1.2MHz switching avoids AM radio band; <20mVPP output ripple in PWM mode ensures SNR >95dB for voice transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3129EMSE-1#TRPBF | Same die, 16-lead MSOP package (4mm × 4mm); θJA = 40°C/W; no exposed thermal pad. | Better suited for prototyping or low-volume designs where QFN rework is impractical; lower thermal performance limits continuous 200mA output at >85°C ambient. | Select for hand-soldered or legacy MSOP-compatible layouts; avoid in thermally constrained enclosures or high-ambient environments. |
| LTC3129-1#TRPBF (adjustable version) | Requires external feedback resistors; supports adjustable VOUT (1.2V to 15V); identical MPPC, RUN, and Burst Mode features. | Used when output voltage must be fine-tuned beyond the eight fixed points or when dynamic VOUT adjustment is required via DAC. | Choose only if design requires non-standard output voltages; adds BOM cost and resistor tolerance error versus fixed-output LTC3129EUD-1#TRPBF. |
Compared with LTC3129EMSE-1#TRPBF, the LTC3129EUD-1#TRPBF delivers superior thermal performance and smaller footprint; compared with LTC3129-1#TRPBF, it eliminates feedback components and guarantees tighter output accuracy without resistor drift or layout sensitivity.
Availability
LTC3129EUD-1#TRPBF is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, solar panel post-regulators, and intrinsically safe power supplies requiring stable component supply, full temperature-range qualification (–40°C to 125°C), and long-term production continuity.
Supply support for LTC3129EUD-1#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 product support, documentation, and manufacturing continuity for all Linear-branded power management ICs.
The LTC3129EUD-1#TRPBF belongs to Linear's ultralow-power buck-boost converter family, designed specifically for energy-constrained applications including energy harvesting, battery-powered IoT, and safety-critical portable instrumentation.
FAQ
What is the minimum input voltage required for the LTC3129EUD-1#TRPBF to start switching?
The LTC3129EUD-1#TRPBF 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-enabling compatibility with partially discharged alkaline or lithium primary cells. Startup behavior is controlled by the RUN pin threshold (1.22V rising), which can be set higher using an external resistor divider.
How does the MPPC function work in the LTC3129EUD-1#TRPBF?
The MPPC function in the LTC3129EUD-1#TRPBF uses an internal 1.175V reference to regulate the input voltage (VIN) to a user-defined level via an external resistor divider on the MPPC pin. When the connected energy source cannot deliver full load current, the LTC3129EUD-1#TRPBF reduces inductor current to hold VIN at VMPPC = 1.175V × (1 + Rtop/Rbottom), ensuring maximum power extraction from photovoltaic or thermoelectric sources.
Can the LTC3129EUD-1#TRPBF operate with an output voltage lower than its input voltage?
Yes-the LTC3129EUD-1#TRPBF operates seamlessly in buck mode when VOUT < VIN, boost mode when VOUT > VIN, and pass-through mode when VOUT ≈ VIN. Its four-switch architecture and average current mode control eliminate mode-transition transients, making it suitable for applications where VIN may cross VOUT during operation (e.g., battery discharge curves).
What is the purpose of the BST1 and BST2 pins on the LTC3129EUD-1#TRPBF?
BST1 and BST2 are bootstrapped gate-drive supplies for the high-side N-channel MOSFETs controlling SW1 and SW2, respectively. Each must be connected to its corresponding switch node via a 22nF capacitor (4.7nF–47nF acceptable) to generate the ~5V gate drive voltage needed to fully enhance the internal high-side switches-ensuring low conduction losses in both buck and boost configurations.
Does the LTC3129EUD-1#TRPBF require external compensation components?
No-the LTC3129EUD-1#TRPBF includes fully integrated loop compensation. Its average current mode control architecture uses internal transconductance amplifiers and fixed compensation networks, eliminating the need for external Type-II or Type-III compensation components. This simplifies design, reduces BOM count, and ensures stable operation across all eight output voltage settings and input conditions.
LTC3129EUD-1#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:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.92V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 15V
- 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-1#TRPBF FAQ
1.How can I place an order for LTC3129EUD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3129EUD-1#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-1#TRPBF reliable?
The price and inventory of LTC3129EUD-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3129EUD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3129EUD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3129EUD-1#TRPBF?
LTC3129EUD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3129EUD-1#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-1#TRPBF?
For technical support, including LTC3129EUD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3129EUD-1#TRPBF requirements.
6.How does Aetrix verify that LTC3129EUD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3129EUD-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3129EUD-1#TRPBF?
All LTC3129EUD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3129EUD-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3129EUD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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