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Analog Devices Inc. LTC3129EMSE-1#TRPBF
- Part No.:
- LTC3129EMSE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3129EMSE-1#TRPBF.pdf
- Description:
- IC REG BCK BST PROG 200MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,102
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Product details
Overview
LTC3129EMSE-1#TRPBF from Analog Devices (formerly Linear Technology) is a 200mA synchronous buck-boost DC/DC converter with 1.3µA quiescent current in Burst Mode, fixed 1.2MHz PWM switching, and eight user-selectable fixed output voltages (2.5V–15V). It features maximum power point control (MPPC), accurate RUN pin threshold (1.22V typ), and operates across 1.92V–15V input range - ideal for energy-harvesting systems powered by photovoltaic panels or low-voltage batteries.
For engineers reviewing the LTC3129EMSE-1#TRPBF datasheet, LTC3129EMSE-1#TRPBF pinout, LTC3129EMSE-1#TRPBF application, or LTC3129EMSE-1#TRPBF equivalent, key selection considerations include its MSOP-16 package thermal performance (θJA = 40°C/W), MPPC programmability for solar input regulation, 10nA shutdown current, and seamless buck/boost mode transitions without output transients.
Technical Context
The LTC3129EMSE-1#TRPBF employs average current mode control with an internally compensated transconductance amplifier and a 1.2MHz oscillator, enabling stable regulation across VIN < VOUT, VIN > VOUT, and VIN ≈ VOUT conditions. Its four-NMOS switch topology supports bidirectional power flow with no external diodes required.
It integrates an internal voltage regulator (VCC = 4.1V typ), programmable MPPC (1.175V reference), and digital output voltage selection via VS1–VS3 pins. The RUN comparator provides hysteresis (80mV typ) for predictable turn-on at 1.22V rising threshold, while PGOOD monitors output voltage with –7.5% falling threshold relative to programmed VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.92V–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 and low-power microcontrollers |
| Quiescent Current | 1.3µA in Burst Mode; extends battery life in always-on IoT edge devices |
| Switching Frequency | 1.2MHz nominal; allows use of compact 10µH inductors and ceramic capacitors |
| Output Voltage Options | Eight fixed settings (2.5V–15V) selected via VS1/VS2/VS3 logic pins; eliminates external feedback resistors |
| MPPC Reference Voltage | 1.175V ±25mV; sets precise input voltage regulation point for photovoltaic or thermoelectric harvesters |
| Shutdown Current | 10nA max; ensures negligible drain during system sleep states |
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 |
|---|---|---|
| BST1 (Pin 15) | Boot-strapped supply for SW1 high-side driver | Must connect to SW1 via 22nF capacitor; enables NMOS gate drive above VIN |
| VIN (Pin 16) | Main input power supply | Accepts 1.92V–15V; requires ≥4.7µF ceramic decoupling close to pin |
| VCC (Pin 1) | Internal LDO output (4.1V typ) | Powers internal circuitry; can be back-driven up to 5.5V; bypass with ≥2.2µF ceramic |
| RUN (Pin 2) | Enable comparator input | 1.22V rising threshold enables switching; hysteresis prevents chatter near UVLO |
| MPPC (Pin 3) | Maximum Power Point Control reference | 1.175V reference; connects to resistor divider from VIN to set optimal input voltage |
| GND (Pin 4) | Signal ground reference | Must tie directly to PCB ground plane; separate from PGND path |
| VS3 (Pin 5) | Output voltage select bit 2 | Digital input (0/VCC) selecting one of eight fixed VOUT values per Table 1 |
| VS2 (Pin 6) | Output voltage select bit 1 | Digital input (0/VCC); combined with VS1/VS3 determines final output setting |
| VS1 (Pin 7) | Output voltage select bit 0 | Digital input (0/VCC); all three pins define VOUT per documented binary mapping |
| PWM (Pin 8) | Mode selection control | Low = Burst Mode (1.3µA IQ); High = fixed-frequency PWM (low-noise operation) |
| PGOOD (Pin 9) | Open-drain power-good indicator | Pulls low when VOUT drops >7.5% below programmed value; sinks up to 15mA |
| VOUT (Pin 10) | Regulated output voltage | Delivers up to 200mA; requires ≥4.7µF ceramic output capacitor |
| BST2 (Pin 11) | Boot-strapped supply for SW2 high-side driver | Must connect to SW2 via 22nF capacitor; enables NMOS gate drive above VOUT |
| SW2 (Pin 12) | High-side switch node (boost path) | Connects to inductor; short/wide trace minimizes EMI and conduction loss |
| PGND (Pin 13) | Power ground return | Primary return for high-current paths; must connect to exposed pad (Pin 17) |
| SW1 (Pin 14) | High-side switch node (buck path) | Connects to inductor; same layout rules as SW2 for low EMI and RDS(ON) efficiency |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost mode transition | Eliminates output voltage transients during VIN/VOUT crossover - critical for noise-sensitive analog sensors |
| Integrated MPPC with 1.175V reference | Enables direct solar panel interface without external op-amps or ADCs; reduces BOM count by ≥3 components |
| Eight fixed output voltages (2.5V–15V) | Programmed via three logic pins - removes need for precision feedback resistors and associated layout sensitivity |
| 10nA shutdown current | Supports ultra-low-power deep-sleep states in battery-operated devices with multi-year shelf life |
| Thermally enhanced MSOP package | 40°C/W junction-to-ambient thermal resistance enables 200mA continuous output without heatsink in standard PCB layouts |
| Accurate RUN pin threshold (1.22V ±60mV) | Allows precise brown-out protection and controlled power-up sequencing from weak energy sources |
Applications
| Industrial Wireless Sensor Nodes | Solar Panel Post-Regulator/Charger |
|---|---|
Use Scenario: Battery-less node powered by indoor light-harvesting PV cell delivering 1–5V at <100µA under ambient lighting. IC Role / Device Role / Timing Role: Primary DC/DC regulator maintaining stable 3.3V rail for MCU and RF transceiver despite highly variable input. Use Value: MPPC locks input at peak power point; 1.3µA quiescent current preserves harvested energy; seamless buck-boost avoids dropout during low-light periods. |
Use Scenario: Outdoor solar-powered environmental monitor using small monocrystalline panel (VOC ≈ 6.5V, ISC ≈ 80mA) charging Li-ion battery via regulated 4.2V output. IC Role / Device Role / Timing Role: Front-end buck-boost regulator extracting maximum power from panel and delivering precise 4.2V to charging IC. Use Value: Programmable MPPC sets VIN = 1.175V × (1 + R1/R2) to match panel's VMP; fixed 5V output option simplifies downstream USB-compatible charging. |
| Intrinsically Safe Power Supplies | Wireless Microphones |
Use Scenario: Hazardous-area gas detector requiring certified low-energy power delivery (<100mW) with fault containment. IC Role / Device Role / Timing Role: Isolated secondary-side regulator converting 12V loop supply to 3.3V for sensor and BLE radio, with strict current limiting. Use Value: 10nA shutdown current meets IEC 60079-11 energy storage limits; thermal shutdown and current foldback prevent ignition-capable faults. |
Use Scenario: Compact handheld UHF wireless microphone operating from two AAA alkaline cells (1.8–3.2V) with 200ms burst transmission every 5 seconds. IC Role / Device Role / Timing Role: Primary voltage regulator generating stable 5.0V for RF PA and audio codec, adapting to declining battery voltage. Use Value: Fixed 5V output (VS1=VCC, VS2=VCC, VS3=0V) eliminates feedback drift; 95% peak efficiency sustains runtime; Burst Mode extends standby time >10× vs PWM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3129IMSE-1#TRPBF | Same functionality and pinout; rated for –40°C to 125°C industrial temperature range vs. LTC3129EMSE-1#TRPBF's 0°C to 85°C | Required for automotive under-hood or outdoor industrial deployments where ambient exceeds 85°C | Select when extended temperature qualification is mandatory; otherwise identical design reuse |
| LTC3129EUD-1#TRPBF | Same electrical specs but in 3mm × 3mm QFN package (θJA = 68°C/W); exposes thermal pad on bottom for improved heat dissipation | Better thermal performance in space-constrained layouts; requires different PCB footprint and reflow profile | Choose for higher ambient temperatures or denser board layouts where MSOP thermal resistance is insufficient |
Compared with LTC3129EMSE-1#TRPBF, the IMSE-1 variant offers guaranteed operation up to 125°C for harsh environments, while the UDF-1 variant delivers lower thermal resistance in compact QFN form - both retain identical MPPC, RUN, and output selection logic but differ in temperature rating and package thermal behavior.
Availability
LTC3129EMSE-1#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 with full traceability and long-term lifecycle support.
Supply support for LTC3129EMSE-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 its legacy of high-performance power management ICs with rigorous characterization and reliability testing.
The LTC3129-1 product line was designed specifically for ultra-low-power energy harvesting applications, integrating MPPC, sub-µA quiescent operation, and seamless buck-boost regulation to replace discrete boost+buck solutions in battery-free and long-life systems.
FAQ
What is the minimum input voltage required for startup of the LTC3129EMSE-1#TRPBF?
The LTC3129EMSE-1#TRPBF requires a minimum VIN of 2.42V to initiate startup. Once running, it sustains operation down to 1.92V due to bootstrap operation - verified in Electrical Characteristics table under "Input Voltage Range" with condition "VCC > 2.42V (Back-Driven)". This enables reliable wake-up from depleted alkaline cells.
How does the MPPC function work in the LTC3129EMSE-1#TRPBF, and what external components are needed?
The LTC3129EMSE-1#TRPBF uses its MPPC pin (Pin 3) as a 1.175V reference input. Connecting it to a resistor divider from VIN to GND sets the regulated input voltage as VIN = 1.175V × (1 + Rtop/Rbottom). No op-amp or ADC is required - the internal comparator servo-controls inductor current to hold VIN at this point, maximizing power extraction from PV or TEG sources.
Can the LTC3129EMSE-1#TRPBF deliver 200mA continuously across its full input and output voltage range?
No - the LTC3129EMSE-1#TRPBF delivers 200mA only in buck mode (VIN > VOUT). In boost mode (VIN < VOUT), maximum output current decreases as the ratio VOUT/VIN increases, per Figure 11 ("Maximum Output Current vs VIN and VOUT"). At VIN = 2.5V and VOUT = 15V, max output is ~50mA; full 200mA is achievable only when VIN ≥ VOUT and thermal limits permit.
What is the purpose of the BST1 and BST2 pins on the LTC3129EMSE-1#TRPBF, and how should they be routed?
BST1 and BST2 (Pins 15 and 11) provide bootstrapped gate drive supplies for the high-side NMOS switches. Each must connect to its respective switch node (SW1/SW2) via a 22nF ceramic capacitor placed within 2mm of the IC. This ensures sufficient gate voltage (>VGS(th)) for full enhancement. Traces must be short and wide to minimize impedance and ringing - critical for efficiency and EMI compliance.
Is the LTC3129EMSE-1#TRPBF pin-compatible with the adjustable-output LTC3129 version?
Yes - the LTC3129EMSE-1#TRPBF is functionally identical to the LTC3129 in MSOP-16 package and shares the same pinout, including VS1–VS3, PWM, RUN, and MPPC. The only difference is that LTC3129EMSE-1#TRPBF has factory-trimmed internal feedback for fixed outputs, while LTC3129 uses external resistors for adjustable VOUT. No PCB changes are needed for migration between them.
LTC3129EMSE-1#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:
- 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-MSOP-EP
LTC3129EMSE-1#TRPBF FAQ
1.How can I place an order for LTC3129EMSE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3129EMSE-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 LTC3129EMSE-1#TRPBF reliable?
The price and inventory of LTC3129EMSE-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 LTC3129EMSE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3129EMSE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3129EMSE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3129EMSE-1#TRPBF?
LTC3129EMSE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3129EMSE-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 LTC3129EMSE-1#TRPBF?
For technical support, including LTC3129EMSE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3129EMSE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3129EMSE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3129EMSE-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 LTC3129EMSE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3129EMSE-1#TRPBF?
All LTC3129EMSE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3129EMSE-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 LTC3129EMSE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3129EMSE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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