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Analog Devices Inc. LTC3129EMSE#PBF
- Part No.:
- LTC3129EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3129EMSE#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 200MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,502
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Product details
Overview
LTC3129EMSE#PBF from Analog Devices (formerly Linear Technology) is a 200mA synchronous buck-boost DC/DC converter with 1.3µA quiescent current, wide 1.92V–15V input range and 1.4V–15.75V programmable output, featuring integrated maximum power point control (MPPC) for photovoltaic energy harvesting and seamless mode transitions in industrial wireless sensor nodes.
For engineers reviewing the LTC3129EMSE#PBF datasheet, LTC3129EMSE#PBF pinout, LTC3129EMSE#PBF application, or LTC3129EMSE#PBF equivalent, key selection criteria include its 1.2MHz ultralow-noise PWM architecture, thermally enhanced 16-lead MSOP package, accurate RUN pin threshold (1.22V typ), and Burst Mode® operation enabling ultra-low-power operation in battery- and harvester-powered systems.
Technical Context
The LTC3129EMSE#PBF implements average current mode control with an internally compensated transconductance error amplifier and fixed 1.2MHz oscillator, enabling stable regulation across buck, boost, and buck-boost regions without subharmonic oscillation. Its proprietary four-switch topology supports continuous conduction mode (CCM) operation and eliminates discontinuities in inductor current during mode transitions.
It integrates dual bootstrapped gate drivers (BST1/BST2), programmable MPPC feedback (1.175V reference), and a dedicated RUN comparator with 80mV hysteresis to enable precise VIN turn-on control. The device uses internal N-channel MOSFETs with 0.75Ω typical RDS(ON) and supports single-inductor operation with no external compensation required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1.92V–15V after startup; enables direct connection to Li-ion, supercapacitors, or solar panels without pre-regulation. |
| VOUT Range | 1.4V–15.75V via external resistor divider; supports post-regulation of harvested energy sources across diverse system rails. |
| Output Current | 200mA in buck mode; sufficient for low-power microcontrollers, RF transceivers, and analog sensors in wireless nodes. |
| Quiescent Current | 1.3µA in Burst Mode; extends battery life in intermittently active IoT endpoints by minimizing standby loss. |
| Switching Frequency | 1.2MHz nominal; allows use of compact 10µH inductors and ceramic capacitors, reducing solution footprint by >40% vs lower-frequency alternatives. |
| MPPC Reference | 1.175V ±25mV; enables accurate servoing of input voltage to maximize power extraction from PV cells or thermoelectric generators. |
| RUN Threshold | 1.22V rising edge with 80mV hysteresis; permits reliable, noise-immune startup control using simple resistor dividers from VIN. |
Pinout & Package
The LTC3129EMSE#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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 16) | Main input supply rail | Accepts 1.92V–15V; powers internal VCC regulator and high-side switches; requires ≥4.7µF local ceramic decoupling. |
| VCC (Pin 1) | Internal LDO output | 4.1V regulated supply for control circuitry; can be back-driven up to 5.5V; bypassed with ≥2.2µF ceramic capacitor. |
| RUN (Pin 2) | Enable comparator input | Turns on VCC at 0.9V, enables switching at 1.22V (rising); hysteresis prevents chatter near threshold. |
| MPPC (Pin 3) | Maximum Power Point Control reference | Programs input voltage setpoint via resistor divider; 1.175V reference enables optimal PV panel operating point tracking. |
| FB (Pin 5) | Feedback node for output regulation | 1.175V reference; connects to resistor divider from VOUT; determines final output voltage with ±0.124V tolerance. |
| PWM (Pin 8) | Mode select input | Low = Burst Mode (1.3µA IQ); High = fixed 1.2MHz PWM; internal 5MΩ pull-down prevents floating. |
| PGOOD (Pin 9) | 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 10) | Regulated output rail | Delivers up to 200mA; requires ≥4.7µF local ceramic capacitance; low ESR critical for stability. |
| BST1 / BST2 (Pins 11, 13) | Floating gate drive supplies | Connect via 22nF capacitors to SW1/SW2; sustain high-side NMOS gate drive during 100% duty cycle conditions. |
| SW1 / SW2 (Pins 12, 14) | Power switch terminals | Drive opposite ends of single inductor; require short, wide PCB traces to minimize EMI and conduction loss. |
| PGND (Pin 13 + Exposed Pad 17) | Power ground return | Primary current return path for switches and inductor; exposed pad must be soldered to PCB ground plane for θJA = 40°C/W. |
| GND (Pin 4) | Signal ground reference | Reference for FB, RUN, MPPC, PWM; must connect directly to PGND near device to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate buck and boost converters; reduces BOM count and PCB area in space-constrained sensor nodes. |
| Programmable MPPC with 1.175V reference | Enables automatic optimization of input voltage for maximum power transfer from non-ideal sources like solar cells or TEGs. |
| 1.2MHz fixed-frequency PWM with Burst Mode | Provides low-noise operation for sensitive analog circuits while dropping to 1.3µA IQ during idle periods to extend battery life. |
| Accurate RUN pin with 80mV hysteresis | Allows deterministic startup/shutdown sequencing without external supervisors; supports brown-out protection in harsh environments. |
| Integrated loop compensation and soft-start | Removes requirement for external compensation components; ensures monotonic startup and prevents inrush current damage. |
Applications
| Industrial Wireless Sensor Nodes | Solar Panel Post-Regulator/Charger |
|---|---|
|
Use Scenario: Battery- or energy-harvesting–powered temperature/humidity sensors transmitting data via LoRaWAN or BLE. IC Role / Device Role / Timing Role: Primary DC/DC regulator converting variable solar or battery input into stable 3.3V rail for MCU and radio. Use Value: 1.3µA quiescent current extends multi-year battery life; MPPC maximizes harvest from partial-shade or low-light conditions. |
Use Scenario: Off-grid environmental monitoring station powered by small photovoltaic panel with variable irradiance. IC Role / Device Role / Timing Role: MPPT-enabled post-regulator maintaining constant 5V output despite fluctuating panel voltage and load demand. Use Value: 1.175V MPPC reference enables precise input voltage servoing; 1.92V minimum VIN allows operation at dawn/dusk or under cloud cover. |
| Intrinsically Safe Power Supplies | Wireless Microphones |
|
Use Scenario: Hazardous-area instrumentation requiring certified low-energy power conversion in Zone 0/1 environments. IC Role / Device Role / Timing Role: Isolated secondary-side regulator delivering <100mW to explosion-proof sensor electronics. Use Value: 10nA shutdown current and thermal shutdown ensure compliance with IEC 60079-11; 1.2MHz switching avoids RF interference bands. |
Use Scenario: Compact handheld UHF wireless microphone with rechargeable Li-ion battery and low-noise audio front-end. IC Role / Device Role / Timing Role: Efficient buck-boost converter supplying clean 5V to RF transmitter and 3.3V to codec via LDO. Use Value: Ultralow-noise 1.2MHz PWM minimizes switching artifacts in audio band; 95% peak efficiency preserves runtime during transmission bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3129-1EMSE#PBF | Fixed-output variants (e.g., 3.3V, 5V); eliminates FB resistor divider but lacks programmability. | Best for cost-sensitive, volume production where output voltage is invariant across designs. | Select when VOUT is fixed and board space savings from omitting feedback resistors outweigh flexibility needs. |
| TPS63020DSJR | 2A output capability; higher 2.5V–5.5V VIN range; no MPPC; 2.4MHz switching; 25µA IQ in PFM mode. | Suitable for higher-current portable devices but not optimized for ultra-low-power harvesting or precise MPP tracking. | Choose for applications needing >200mA or tighter input voltage constraints, accepting higher IQ and no MPPC. |
Compared with LTC3129-1EMSE#PBF, the LTC3129EMSE#PBF offers full output voltage programmability at the cost of two external resistors; compared with TPS63020DSJR, it delivers 20× lower quiescent current and integrated MPPC-critical for energy-harvesting systems-but trades off peak current capability and input voltage range.
Availability
LTC3129EMSE#PBF is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, solar-powered remote monitors, and intrinsically safe instrumentation requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LTC3129EMSE#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 its legacy of high-performance power management ICs for precision, low-power, and ruggedized applications.
The LTC3129EMSE#PBF belongs to Linear's ultralow-quiescent-current buck-boost converter family, designed specifically for energy-constrained systems including wireless sensors, wearable medical devices, and ambient energy harvesters.
FAQ
What is the minimum input voltage required for the LTC3129EMSE#PBF to start switching?
The LTC3129EMSE#PBF 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 continued function during battery discharge or low-light solar conditions. This behavior is confirmed in the Electrical Characteristics table under "Input Voltage Range" and validated in Figure 3129 G11 showing maximum output current vs VIN/VOUT.
How does the MPPC function work in the LTC3129EMSE#PBF, and what external components are needed?
The MPPC function in the LTC3129EMSE#PBF uses a 1.175V internal reference to servo VIN to a user-defined voltage via a resistor divider from VIN to GND connected to the MPPC pin. For example, setting R5/R6 = 2.0 yields VIN = 1.175V × (1 + 2.0) = 3.525V. No active components are required-only two precision resistors-and the pin must be routed with minimal trace length to avoid noise-induced instability, as specified in the Pin Functions section.
Can the LTC3129EMSE#PBF operate with a single inductor, and what is the recommended inductance value?
Yes, the LTC3129EMSE#PBF uses a single inductor in its four-switch buck-boost topology, as shown in Figure 3129 F01. The recommended value is 10µH (±20%), with saturation current rating ≥400mA. This value balances size, ripple current (<30% peak-to-peak), and efficiency across the full VIN/VOUT range, per the Typical Application schematic (TA01a) and Efficiency curves (G01–G09).
What is the thermal performance difference between the MSOP and QFN packages for the LTC3129EMSE#PBF?
The LTC3129EMSE#PBF in the 16-lead MSOP package has θJA = 40°C/W (with exposed PGND pad soldered), versus 68°C/W for the QFN variant. This 28°C/W improvement significantly enhances power dissipation capability-allowing ~2.4× higher continuous output current at the same ambient temperature-making the MSOP preferred for thermally constrained layouts despite its larger footprint.
Does the LTC3129EMSE#PBF require external compensation components for stability?
No, the LTC3129EMSE#PBF features fully integrated loop compensation, including the transconductance error amplifier and average current mode control network. As stated in the Description and Operation sections, "Built-in loop compensation and soft-start simplify the design," and no external compensation capacitors or resistors are shown in any reference schematic-including TA01a-confirming complete internal implementation.
LTC3129EMSE#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:
- 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#PBF FAQ
1.How can I place an order for LTC3129EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3129EMSE#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#PBF reliable?
The price and inventory of LTC3129EMSE#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3129EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3129EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3129EMSE#PBF?
LTC3129EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3129EMSE#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#PBF?
For technical support, including LTC3129EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3129EMSE#PBF requirements.
6.How does Aetrix verify that LTC3129EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3129EMSE#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3129EMSE#PBF?
All LTC3129EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3129EMSE#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#PBF part is unused and in its original packaging.
Return procedure for LTC3129EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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