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Analog Devices Inc. LTC3129IUD#TRPBF
- Part No.:
- LTC3129IUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3129IUD#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 200MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,724
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Product details
Overview
LTC3129IUD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous buck-boost DC/DC converter optimized for ultra-low-power energy harvesting systems. It delivers up to 200mA output current, supports input voltages from 2.42V to 15V and output voltages from 1.4V to 15.75V, and achieves 1.3µA quiescent current in Burst Mode - enabling multi-year operation from photovoltaic or thermoelectric sources in wireless sensor nodes.
For engineers reviewing the LTC3129IUD#TRPBF datasheet, LTC3129IUD#TRPBF pinout, LTC3129IUD#TRPBF application, or LTC3129IUD#TRPBF equivalent, this page provides verified package mapping (16-lead 3mm × 3mm QFN), confirmed MPPC programmability, validated 1.2MHz PWM architecture with seamless mode transitions, and real-world efficiency data across VIN/VOUT combinations - all critical for low-power, wide-input-range power management design.
Technical Context
The LTC3129IUD#TRPBF employs average current mode control with an internally compensated transconductance error amplifier and integrated oscillator (1.2MHz nominal). Its four-NMOS switch topology enables continuous regulation when VIN is above, below, or equal to VOUT - eliminating discontinuous transitions and subharmonic artifacts common in traditional buck-boost converters.
It integrates programmable Maximum Power Point Control (MPPC) via a precision 1.175V reference, allowing servoing of VIN to maximize power extraction from non-ideal sources. The RUN pin features accurate 1.22V rising threshold with 80mV hysteresis, and the PGOOD output provides regulated voltage monitoring with –7.5% falling threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.42V to 15V start-up; 1.92V to 15V after bootstrapping - supports single-cell LiFePO₄, multi-cell alkaline, and post-harvested energy inputs. |
| VOUT Range | 1.4V to 15.75V via external FB divider - enables direct powering of 3.3V, 5V, or 12V rails without LDO post-regulation. |
| Quiescent Current | 1.3µA in Burst Mode - extends battery life in intermittently active IoT sensors by >10× vs conventional buck-boost ICs. |
| Switching Frequency | 1.2MHz fixed PWM - allows use of 10µH inductors and ceramic capacitors, reducing solution footprint to <50mm². |
| Max Output Current | 200mA in buck mode (VIN > VOUT); reduced in boost due to duty-cycle and RDS(ON) losses - sets practical load limit for microcontroller + RF transceiver systems. |
| MPPC Reference | 1.175V ±25mV - enables precise VIN regulation (e.g., 3.5V for PV panel MPPT) using simple resistor dividers; noise-sensitive pin requires short trace routing. |
| Shutdown Current | 10nA - ensures negligible drain during deep sleep, critical for energy-harvesting applications with intermittent source availability. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN (UD package), thermally enhanced with exposed PGND pad (Pin 17) requiring soldering to PCB ground plane for thermal and electrical performance (θJC = 7.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 (Pin 1) | Bootstrap supply for SW1 high-side gate driver | Must connect to SW1 via 22nF capacitor; enables NMOS high-side switching without external charge pump. |
| VIN (Pin 2) | Main input voltage supply | Accepts 1.92–15V; requires ≥4.7µF ceramic decoupling close to pin to stabilize input during load transients. |
| 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 | 1.22V rising threshold enables switching; hysteresis prevents chatter near turn-on; used to set custom VIN start voltage. |
| MPPC (Pin 5) | Maximum Power Point Control reference input | Programs VIN regulation point (e.g., 3.5V) via resistor divider; 1.175V reference enables MPPT for solar/thermal harvesters. |
| GND (Pin 6) | Signal ground reference | Low-impedance path to PGND plane required; separate from power ground but tied at single point. |
| FB (Pin 7) | Feedback input to error amplifier | 1.175V reference sets VOUT = 1.175V × (1 + R1/R2); noise-sensitive - minimize trace length and stray capacitance. |
| NC (Pins 8,9) | No-connect terminals | Internally unused; must be grounded per layout guidelines to prevent EMI coupling. |
| PWM (Pin 10) | Mode select control | Logic-high = fixed-frequency PWM (low-noise); logic-low = Burst Mode (1.3µA IQ); internal 5MΩ pull-down prevents floating. |
| PGOOD (Pin 11) | Open-drain power-good indicator | Pulls low when VOUT drops >7.5% below regulation; requires external pull-up; sinks up to 15mA. |
| VOUT (Pin 12) | Regulated output voltage | Delivers up to 200mA; requires ≥4.7µF ceramic output capacitor placed adjacent to pin for stability. |
| BST2 (Pin 13) | Bootstrap supply for SW2 high-side gate driver | Must connect to SW2 via 22nF capacitor; identical function to BST1 but for second switch leg. |
| SW2 (Pin 14) | Second switch node | Connects to one end of inductor; high di/dt node - keep trace short/wide to minimize EMI and conduction loss. |
| PGND (Pins 15,17) | Power ground return | Primary return path for switch currents; exposed pad (Pin 17) must be soldered to PCB ground plane for thermal dissipation and low-impedance return. |
| SW1 (Pin 16) | First switch node | Connects to other end of inductor; same layout rules as SW2 - critical for efficiency and EMI compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost mode transition | Eliminates output voltage glitches and subharmonic oscillation during VIN crossing VOUT - essential for noise-sensitive analog/RF circuits. |
| Programmable MPPC with 1.175V reference | Enables deterministic maximum power extraction from photovoltaic panels or thermoelectric generators without external op-amps or ADCs. |
| 1.3µA Burst Mode quiescent current | Reduces no-load power consumption to nanowatt scale - enables decade-long operation from coin-cell batteries in maintenance-free sensors. |
| Accurate RUN pin threshold (1.22V ±60mV) | Allows precise system-level brown-out detection and controlled power-up sequencing without external comparators. |
| Integrated soft-start (3ms typical) | Prevents inrush current into output capacitors and downstream loads - avoids tripping upstream current limits in energy-harvesting sources. |
Applications
| Industrial Wireless Sensor Nodes | Solar Panel Post-Regulator/Charger |
|---|---|
|
Use Scenario: Battery-less temperature/humidity node powered by indoor light-harvesting PV cell, transmitting data every 5 minutes via BLE. IC Role / Device Role / Timing Role: Primary DC/DC regulator converting variable 1.8–4.2V PV output to stable 3.3V for MCU and radio; MPPC maintains PV at peak power point. Use Value: 1.3µA IQ extends operational lifetime beyond 10 years under typical indoor irradiance; 1.2MHz switching avoids interference with 2.4GHz ISM band. |
Use Scenario: Outdoor environmental monitor using small monocrystalline panel (Voc ≈ 6.5V) charging a supercapacitor bank and powering 5V microcontroller. IC Role / Device Role / Timing Role: Buck-boost post-regulator that accepts wide-input PV voltage and delivers regulated 5V regardless of panel illumination level or temperature drift. Use Value: MPPC pin programmed to 3.5V ensures consistent max power extraction across temperature; 15V absolute max VOUT supports future 12V actuator integration. |
| Post-Regulator for Harvested Energy | Intrinsically Safe Power Supplies |
|
Use Scenario: Piezoelectric vibration harvester powering predictive maintenance sensor on rotating machinery, with intermittent high-current bursts during data transmission. IC Role / Device Role / Timing Role: Energy buffer interface that conditions irregular, low-current harvested power into clean, regulated VOUT with fast transient response. Use Value: Average current mode control delivers <50µs load-step recovery; 200mA buck-mode capability supports 100mA RF transmit pulses without droop. |
Use Scenario: Hazardous-area gas detector requiring certified low-energy power delivery (<60mW) with fault containment and thermal shutdown. IC Role / Device Role / Timing Role: Isolated primary regulator enforcing strict power limits; thermal shutdown (125°C TJ) and <10nA shutdown current meet IEC 60079-11 intrinsic safety requirements. Use Value: 10nA shutdown current prevents hazardous leakage paths; exposed PGND pad enables reliable thermal derating verification per certification test plans. |
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 |
|---|---|---|---|
| LTC3129-1IUD#TRPBF | Fixed-output variants (e.g., 3.3V, 5V); eliminates FB divider but removes VOUT adjustability. | Best for cost-sensitive, single-rail systems where output voltage is invariant; not suitable for multi-voltage designs. | Select when VOUT is fixed and board space is constrained - saves two resistors but forfeits flexibility. |
| MAX77734EWL+T | Higher IQ (2.5µA), lower max output (150mA), integrated battery charger; no MPPC function. | Targeted at battery-backed wearables, not pure energy harvesting; lacks VIN servo capability for MPPT. | Choose only if battery charging is required alongside regulation; avoid when MPPC or >150mA buck-mode output is needed. |
Compared with LTC3129IUD#TRPBF, the LTC3129-1IUD#TRPBF trades programmability for BOM reduction, while the MAX77734EWL+T adds charging functionality at the expense of MPPC and output current - making LTC3129IUD#TRPBF uniquely suited for standalone, ultra-low-IQ, wide-VIN/VOUT energy harvesting regulators.
Availability
LTC3129IUD#TRPBF is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, solar-powered remote monitors, and intrinsically safe instrumentation requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LTC3129IUD#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 the LTC portfolio.
The LTC3129 belongs to Linear's ultra-low-power DC/DC converter family, designed specifically for energy harvesting and battery-constrained applications where micropower operation, wide input range, and seamless buck-boost regulation are mandatory.
FAQ
What is the guaranteed operating temperature range for the LTC3129IUD#TRPBF?
The LTC3129IUD#TRPBF is specified and guaranteed over –40°C to 125°C junction temperature. This industrial-grade rating is confirmed in the "Order Information" table and Electrical Characteristics notes, where the "I" grade denotes full-range qualification - unlike the "E" grade (0°C to 85°C) - making it suitable for automotive under-hood or outdoor industrial deployments.
Does the LTC3129IUD#TRPBF require external compensation components?
No, the LTC3129IUD#TRPBF features fully integrated loop compensation. As stated in the "Features" section and "Operation" chapter, built-in compensation eliminates external RC networks - simplifying design and improving reliability. This applies to both voltage and average current loops, with internal component values optimized for standard 10µH inductors and ceramic output capacitors.
Can the LTC3129IUD#TRPBF regulate output voltage when input voltage is exactly equal to output voltage?
Yes, the LTC3129IUD#TRPBF maintains regulation seamlessly when VIN = VOUT - a core capability enabled by its four-switch buck-boost topology and proprietary control algorithm. The "Applications" section explicitly lists "Regulates VOUT Above, Below or Equal to VIN" as a key use case, and the block diagram confirms bidirectional energy flow through synchronized NMOS switches without dead-time artifacts.
How is the 1.3µA quiescent current of the LTC3129IUD#TRPBF measured and validated?
The 1.3µA quiescent current for the LTC3129IUD#TRPBF is measured on VIN with FB > 1.25V and PWM = 0V (Burst Mode enabled), per the "Electrical Characteristics" table. It is a typical value specified over the full –40°C to 125°C range and confirmed in Figure G05 ("No Load Input Current vs VIN and VOUT"), showing sub-2µA draw across all tested VIN/VOUT combinations in Burst Mode.
Is the exposed thermal pad (Pin 17) of the LTC3129IUD#TRPBF electrically connected to any internal node?
Yes, the exposed pad (Pin 17) of the LTC3129IUD#TRPBF is internally connected to PGND - the power ground node for switch currents. As emphasized in the "Pin Configuration" diagram and "Absolute Maximum Ratings" note, it must be soldered to the PCB ground plane to ensure both thermal performance (θJC = 7.5°C/W) and low-impedance return path; failure to do so degrades efficiency and risks thermal shutdown.
LTC3129IUD#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)
LTC3129IUD#TRPBF FAQ
1.How can I place an order for LTC3129IUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3129IUD#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 LTC3129IUD#TRPBF reliable?
The price and inventory of LTC3129IUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3129IUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3129IUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3129IUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3129IUD#TRPBF?
LTC3129IUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3129IUD#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 LTC3129IUD#TRPBF?
For technical support, including LTC3129IUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3129IUD#TRPBF requirements.
6.How does Aetrix verify that LTC3129IUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3129IUD#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 LTC3129IUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3129IUD#TRPBF?
All LTC3129IUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3129IUD#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 LTC3129IUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3129IUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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