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Analog Devices Inc. LTC3129EMSE-1#PBF
- Part No.:
- LTC3129EMSE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3129EMSE-1#PBF.pdf
- Description:
- IC REG BCK BST PROG 200MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,323
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Product details
Overview
LTC3129EMSE-1#PBF from Analog Devices (formerly Linear Technology) is a 200mA synchronous buck-boost DC/DC converter with 1.3µA quiescent current, 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#PBF datasheet, LTC3129EMSE-1#PBF pinout, LTC3129EMSE-1#PBF application, or LTC3129EMSE-1#PBF equivalent, key selection considerations include its MPPC programmability for solar input regulation, ultralow IQ in Burst Mode, seamless buck/boost mode transitions, and MSOP-16 thermal performance (θJA = 40°C/W).
Technical Context
The LTC3129EMSE-1#PBF employs average current mode control with internal loop compensation and a proprietary four-switch buck-boost topology enabling continuous regulation when VIN is above, below, or equal to VOUT. Its 1.2MHz fixed-frequency PWM architecture minimizes EMI and supports compact 10µH inductors and ceramic capacitors.
It integrates dual bootstrapped gate drivers (BST1/BST2), an internal VCC regulator (4.1V typ.), and three digital VS1–VS3 pins that configure one of eight precise output voltages via binary encoding. The MPPC pin servo-controls VIN to maximize power extraction from non-ideal sources using a 1.175V reference and external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1.92V to 15V after startup; enables operation from single AA/AAA cells up to industrial rails. |
| VOUT Options | Eight factory-fixed outputs (2.5V, 3.3V, 4.1V, 5.0V, 6.9V, 8.2V, 12V, 15V); selected via VS1–VS3 logic levels - no external feedback resistors required. |
| IOUT Max | 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 (typ.); allows use of small 10µH inductors and reduces solution footprint vs. lower-frequency alternatives. |
| MPPC Reference | 1.175V ±25mV; sets precise input voltage regulation point for photovoltaic or thermoelectric harvesters. |
| RUN Threshold | 1.22V (rising) with 80mV hysteresis; enables predictable, noise-immune turn-on at user-defined VIN levels. |
Pinout & Package
The LTC3129EMSE-1#PBF is housed in a thermally enhanced 16-lead plastic MSOP package (3mm × 4.9mm) with exposed PGND pad (Pin 17) requiring soldering to PCB ground plane for thermal and electrical integrity (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 16) | Main input supply rail | Accepts 1.92V–15V; requires ≥4.7µF ceramic decoupling close to pin. |
| VOUT (Pin 10) | Regulated output node | Delivers selected fixed voltage (2.5V–15V); requires ≥4.7µF ceramic output capacitance. |
| SW1 / SW2 (Pins 14 / 12) | Power switch terminals | Connect to opposite ends of single inductor; short/wide traces critical for EMI and efficiency. |
| BST1 / BST2 (Pins 15 / 11) | High-side gate drive supplies | Each connects via 22nF capacitor to respective SW pin; enables NMOS high-side drive without external charge pumps. |
| VS1–VS3 (Pins 7–9) | Output voltage select inputs | Digital inputs (0/VCC) setting one of eight VOUT values per Table 1; must not float. |
| RUN (Pin 4) | Enable comparator input | Turns on VCC at ~1.1V, enables switching at ~1.22V; supports resistor-divider VIN threshold programming. |
| MPPC (Pin 5) | Maximum Power Point Control | Programs VIN regulation point (VIN = 1.175V × [1 + R5/R6]); highly noise-sensitive - minimize trace length. |
| PGOOD (Pin 11) | Open-drain status flag | Pulls low when VOUT drops >7.5% below programmed value; requires external pull-up. |
| PWM (Pin 10) | Mode selection | Low = Burst Mode (1.3µA IQ); High = fixed 1.2MHz PWM (lower ripple, higher noise). |
| GND / PGND (Pins 6 / 13 & 17) | Signal and power ground | Separate GND (signal reference) and PGND (power return + thermal path); exposed pad (Pin 17) must be soldered to PCB ground. |
Key Features
| Feature | Design Value |
|---|---|
| Eight fixed VOUT options | Eliminates external feedback resistors and associated layout sensitivity - simplifies design and improves long-term stability. |
| 1.3µA Burst Mode IQ | Extends operational lifetime in battery-powered applications where load duty cycle is low (e.g., sensor wake-up every minute). |
| Seamless buck/boost transitions | No output glitches or subharmonic switching during VIN crossing VOUT - essential for noise-sensitive analog or RF circuits. |
| Integrated MPPC with 1.175V reference | Enables direct, accurate tracking of photovoltaic panel maximum power point without external op-amps or ADCs. |
| Thermally optimized MSOP-16 | 40°C/W junction-to-ambient thermal resistance with proper PGND pad soldering - supports 200mA continuous output in compact space-constrained layouts. |
Applications
| Industrial Wireless Sensor Nodes | Post-Regulator for Harvested Energy |
|---|---|
Use Scenario: Battery- or ambient-energy-powered temperature/humidity sensors transmitting data wirelessly every 5–60 seconds. IC Role / Device Role / Timing Role: Primary DC/DC regulator converting variable harvester output (e.g., 1.8–5V) to stable 3.3V for MCU and radio. Use Value: 1.3µA quiescent current preserves microamp-level harvester output; MPPC maximizes energy capture from thermoelectric or piezoelectric sources. | Use Scenario: Solar-powered soil moisture sensor operating outdoors with partial shading and wide temperature swings. IC Role / Device Role / Timing Role: Buck-boost post-regulator maintaining constant 5.0V output while adapting to PV panel voltage fluctuations (2.2–12V). Use Value: Programmable MPPC ensures panel operates at peak power point; fixed 5.0V output eliminates need for external LDO or feedback network. |
| Solar Panel Post-Regulator/Charger | Intrinsically Safe Power Supplies |
Use Scenario: Low-power gas detector in hazardous environments using miniature solar cell and supercapacitor buffer. IC Role / Device Role / Timing Role: Regulates solar input to charge storage and power analog sensing circuitry with strict current limiting. Use Value: Accurate RUN threshold prevents startup until sufficient solar voltage is available; 10nA shutdown current prevents leakage drain during darkness. | Use Scenario: Explosion-proof handheld instrument powered by two AAA batteries with stringent current and thermal limits. IC Role / Device Role / Timing Role: Efficient voltage translator delivering 3.3V to mixed-signal ASIC while meeting IEC 60079-11 intrinsic safety requirements. Use Value: Internal current limiting (275mA typ. inductor avg. limit) and thermal shutdown prevent fault-induced energy release; MSOP package supports conformal coating. |
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#PBF | Same functionality and pinout; rated for –40°C to 125°C industrial temp range vs. LTC3129EMSE-1#PBF's –40°C to 85°C. | Suitable for under-hood automotive or high-ambient industrial deployments where extended temperature validation is required. | Select when full industrial temperature qualification and tighter parametric guarantees over –40°C to 125°C are mandatory. |
| LTC3129EUD-1#PBF | Identical electrical specs; packaged in 3mm × 3mm QFN (16-lead) instead of MSOP - lower θJA (68°C/W vs. 40°C/W) but requires different PCB layout. | Better thermal performance in high-density layouts; preferred when board space is constrained and thermal vias can be implemented. | Choose for space-critical designs needing smaller footprint and higher power density, accepting QFN reflow and inspection requirements. |
Compared with LTC3129IMSE-1#PBF, the LTC3129EMSE-1#PBF offers identical features at commercial temperature grade, reducing cost where extended temp validation isn't needed; versus LTC3129EUD-1#PBF, it trades slightly higher thermal resistance for easier hand-soldering and legacy MSOP compatibility.
Availability
LTC3129EMSE-1#PBF is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, solar-powered environmental monitors, and intrinsically safe portable instrumentation requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC3129EMSE-1#PBF 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 global wafer fabrication.
The LTC3129-1 belongs to Linear's ultra-low-power buck-boost regulator family, designed specifically for energy-constrained applications such as battery-free IoT sensors, wearable medical devices, and maintenance-free remote monitoring systems.
FAQ
What is the minimum input voltage required for the LTC3129EMSE-1#PBF to start switching?
The LTC3129EMSE-1#PBF requires a minimum VIN of 2.42V to initiate switching after startup. During initial power-up, the device needs at least 2.42V on VIN (or VCC if back-driven) to exit UVLO and enable the internal regulators. Below this, only 10nA shutdown current flows. The RUN pin threshold (1.22V rising) controls enable timing but does not override the VIN UVLO requirement.
How do I configure the LTC3129EMSE-1#PBF for a 5.0V output?
To set the LTC3129EMSE-1#PBF to 5.0V output, tie VS1 to VCC and VS2/VS3 to ground (per Table 1 in the datasheet). This binary configuration (VS3=0, VS2=0, VS1=1) selects the fourth output option. Ensure all VS pins are actively driven - floating states cause undefined VOUT. No external resistors or compensation components are needed.
Does the LTC3129EMSE-1#PBF support true zero-load regulation in Burst Mode?
Yes, the LTC3129EMSE-1#PBF maintains regulated output voltage down to zero load in Burst Mode, drawing only 1.3µA from VIN. Unlike some converters that drop out of regulation at ultra-light loads, its average current mode control and internal compensation ensure stable 5mV–10mV output deviation even with no output current - critical for always-on sensor bias rails.
Can the MPPC function of the LTC3129EMSE-1#PBF be disabled safely?
Yes, the MPPC function is safely disabled by connecting the MPPC pin directly to VCC. This disables the input voltage servo loop and allows the converter to operate as a standard buck-boost regulator. Do not leave MPPC floating - its high-impedance input is noise-sensitive and may cause erratic behavior. Tie to VCC with a short, low-inductance trace.
What is the recommended inductor value and type for the LTC3129EMSE-1#PBF?
Analog Devices specifies a 10µH shielded power inductor (e.g., Coilcraft XAL5030-103MEB) for the LTC3129EMSE-1#PBF. It must handle ≥500mA peak current, have DCR < 150mΩ, and be rated for 1.2MHz operation. Shielded construction minimizes EMI coupling into adjacent analog circuits - essential for precision sensor applications using the LTC3129EMSE-1#PBF.
LTC3129EMSE-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3129EMSE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3129EMSE-1#PBF 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#PBF reliable?
The price and inventory of LTC3129EMSE-1#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3129EMSE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3129EMSE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3129EMSE-1#PBF?
LTC3129EMSE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3129EMSE-1#PBF 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#PBF?
For technical support, including LTC3129EMSE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3129EMSE-1#PBF requirements.
6.How does Aetrix verify that LTC3129EMSE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3129EMSE-1#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3129EMSE-1#PBF?
All LTC3129EMSE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3129EMSE-1#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3129EMSE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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