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Analog Devices Inc. LTC3129IUD-1#PBF
- Part No.:
- LTC3129IUD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3129IUD-1#PBF.pdf
- Description:
- IC REG BUCK BST PROG 200MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:592
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Product details
Overview
LTC3129IUD-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 LTC3129IUD-1#PBF datasheet, LTC3129IUD-1#PBF pinout, LTC3129IUD-1#PBF application, or LTC3129IUD-1#PBF equivalent, key selection considerations include its ultralow IQ in Burst Mode, MPPC programmability for solar input regulation, seamless buck/boost transitions, thermally enhanced 3mm × 3mm QFN package, and internal voltage divider eliminating external feedback resistors.
Technical Context
The LTC3129IUD-1#PBF employs average current mode control with an internally compensated transconductance amplifier, enabling rapid load transient response and inherent line rejection. Its proprietary four-switch buck-boost topology supports continuous regulation when VIN is above, below, or equal to VOUT without subharmonic oscillation or output discontinuity.
It integrates dual bootstrapped gate drivers (BST1/BST2), internal 4.1V LDO for VCC generation, and a dedicated MPPC comparator that servo-controls VIN to 1.175V × (1 + R5/R6) - critical for maximizing power extraction from high-impedance sources like PV cells or thermoelectric generators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.92V–15V after startup; enables direct operation from single AA/AAA, LiFePO₄, or solar panel outputs without pre-regulation. |
| Output Current | 200mA in buck mode; sufficient for powering wireless sensor nodes, RF transceivers, or low-power microcontrollers. |
| Quiescent Current | 1.3µA in Burst Mode; extends battery life in intermittently active IoT endpoints by >10× versus standard buck-boost ICs. |
| Switching Frequency | 1.2MHz (typ); allows use of 10µH inductors and ceramic capacitors, reducing solution footprint to <30mm². |
| Output Voltage Options | Eight fixed settings (2.5V–15V) selected via VS1/VS2/VS3 logic pins; eliminates external resistor divider and improves accuracy vs. adjustable solutions. |
| MPPC Input Threshold | 1.175V (typ); sets precise input voltage regulation point for photovoltaic or piezoelectric harvesters without external op-amps. |
| Shutdown Current | 10nA max; ensures near-zero leakage during deep sleep in intrinsically safe or explosion-proof equipment. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed PGND pad (Pin 17), optimized for thermal dissipation (θJA = 68°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 (Pin 1) | High-side NMOS gate drive supply | Connects via 22nF capacitor to SW1; sustains gate voltage for top switch in buck mode without external charge pump. |
| VIN (Pin 2) | Main input power rail | Accepts 1.92V–15V; powers internal circuitry and switches; requires ≥4.7µF local ceramic decoupling. |
| VCC (Pin 3) | Internal LDO output (4.1V) | Supplies bias for control logic; can be back-driven up to 5.5V; bypass with ≥2.2µF ceramic capacitor. |
| RUN (Pin 4) | Enable comparator input | Turns on VCC at 0.9V (typ), enables switching at 1.22V (typ); enables programmable VIN UVLO using resistor divider. |
| MPPC (Pin 5) | Maximum Power Point Control reference | Sets VIN regulation point at 1.175V × (1 + R5/R6); must be shielded from noise due to 10nA input bias current. |
| GND (Pin 6) | Signal ground reference | Low-impedance return path for analog circuitry; must connect directly to PCB ground plane. |
| VS3–VS1 (Pins 7–9) | Output voltage select inputs | Three logic pins configure eight fixed VOUT options (2.5V–15V); tied to GND or VCC per Table 1. |
| PWM (Pin 10) | Mode selection control | Low = Burst Mode (1.3µA IQ); High = fixed-frequency PWM (low-noise, 1.2MHz); internal 5MΩ pull-down. |
| 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 up to 200mA; requires ≥4.7µF ceramic output capacitor; voltage set solely by VS1–VS3 states. |
| BST2 (Pin 13) | High-side NMOS gate drive supply | Connects via 22nF capacitor to SW2; sustains gate voltage for top switch in boost mode. |
| SW2 (Pin 14) | Boost-mode switch node | Connects to one end of inductor; high di/dt node requiring short, wide PCB trace to minimize EMI. |
| PGND (Pin 15) | Power ground return | Primary return for high-current switches; exposed pad (Pin 17) must be soldered to PCB ground plane for thermal and electrical performance. |
| SW1 (Pin 16) | Buck-mode switch node | Connects to other end of inductor; complements SW2 in four-switch topology; same layout rules apply. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 1.3µA in Burst Mode enables >10-year battery life in wireless sensors with 10s-of-seconds wake intervals. |
| Integrated MPPC function | Directly regulates input voltage to maximize power from photovoltaic panels without external MPPT controller IC. |
| Seamless buck-boost transition | No output glitch or mode-hopping artifacts during VIN crossing VOUT - critical for noise-sensitive audio or RF circuits. |
| Fixed-output voltage selection | Eight factory-trimmed VOUT options eliminate feedback resistor tolerance errors and reduce BOM count by one component. |
| Thermally enhanced QFN | 3mm × 3mm package with exposed PGND pad achieves θJC = 7.5°C/W, supporting 200mA continuous output at 85°C ambient. |
| Accurate RUN pin threshold | 1.22V ±60mV enable threshold with hysteresis allows reliable cold-start from weak primary batteries down to 1.92V. |
Applications
| Solar-Powered Wireless Sensor Node | Post-Regulator for Energy Harvesting |
|---|---|
|
Use Scenario: Indoor/outdoor environmental sensor node powered by small monocrystalline PV cell under variable light conditions (100–1000 lux). IC Role / Device Role / Timing Role: Primary DC/DC regulator that maintains stable 3.3V rail while dynamically adjusting input impedance to extract maximum available power from the PV source. Use Value: Enables >3× longer runtime per mW/cm² compared to non-MPPC buck-boost converters; eliminates need for separate MPPT ASIC. |
Use Scenario: Battery-less wearable health monitor harvesting energy from body heat via thermoelectric generator (TEG) producing 0.5–2.5V at <1mA. IC Role / Device Role / Timing Role: Step-up/down regulator accepting ultra-low, variable TEG output and delivering regulated 2.5V to BLE SoC and analog front-end. Use Value: 1.3µA IQ and 1.92V startup allow operation even during lowest TEG output; seamless mode transition prevents data loss during voltage dips. |
| Intrinsically Safe Instrumentation | Avionics-Grade Wireless Headset |
|
Use Scenario: Hazardous-area gas detector using AA alkaline batteries, requiring certified low-power operation and fault-safe shutdown. IC Role / Device Role / Timing Role: Safety-critical power manager providing 5V rail to MCU and sensor interface, with 10nA shutdown current and thermal shutdown. Use Value: Meets IEC 60079-11 spark-energy limits; PGOOD flag enables system-level fault logging before thermal shutdown occurs. |
Use Scenario: Military-grade headset with digital ANC and Bluetooth LE, operating from two AAA cells across -40°C to +85°C. IC Role / Device Role / Timing Role: Main power supply delivering 6.9V to audio amplifier and 3.3V to radio subsystem via dual-output configuration (using external LDO). Use Value: Guaranteed -40°C to +125°C operation (I-grade), 95% peak efficiency at 100mA, and 1.2MHz switching minimizes audible coil whine in sensitive audio paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Higher IQ (22µA), no MPPC, adjustable VOUT only, 2A output capability | Better suited for high-current portable devices; lacks solar optimization and fixed-VOUT simplicity | Select when >200mA load current or adjustable output is required; avoid when MPPC or ultralow IQ is mandatory |
| LTC3129EMSE-1#PBF | Same silicon, 16-lead MSOP package (4mm × 4mm), higher θJA (40°C/W), identical electrical specs | Preferred for prototyping or manual assembly; lower thermal performance limits continuous 200mA at high ambient | Select for breadboarding or legacy MSOP-compatible designs; choose LTC3129IUD-1#PBF for production volume and thermal headroom |
Compared with TPS63020DSJR and LTC3129EMSE-1#PBF, the LTC3129IUD-1#PBF uniquely combines 1.3µA quiescent current, integrated MPPC, and eight factory-programmed output voltages in a thermally superior 3mm × 3mm QFN - making it optimal for space-constrained, solar-powered, and battery-life-critical applications where precision and efficiency outweigh raw current capability.
Availability
LTC3129IUD-1#PBF 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 across extended temperature ranges and long production lifecycles.
Supply support for LTC3129IUD-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 continues its legacy of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LTC3129-1 product line was designed specifically for ultra-low-power, wide-input-range energy harvesting applications - emphasizing MPPC integration, nanoscale quiescent current, and seamless buck-boost operation in compact packages.
FAQ
What is the guaranteed operating temperature range for the LTC3129IUD-1#PBF?
The LTC3129IUD-1#PBF is specified and tested over –40°C to +125°C junction temperature. This Industrial grade rating ensures reliable operation in harsh environments such as outdoor sensor enclosures, avionics bays, and industrial control cabinets where ambient temperatures exceed commercial limits. The device's thermal design - including exposed PGND pad soldering - supports full-rated 200mA output across this range.
How does the MPPC function work in the LTC3129IUD-1#PBF, and what external components are required?
The MPPC function in the LTC3129IUD-1#PBF uses an internal 1.175V reference to regulate VIN to VMPP = 1.175V × (1 + R5/R6), where R5 connects from VIN to MPPC and R6 connects from MPPC to GND. Only two resistors are needed - no op-amps or microcontrollers. The MPPC pin draws just 10nA, so resistor values can be high (e.g., 1MΩ/100kΩ) to minimize power loss. Layout best practice: keep MPPC trace short and away from noisy nodes.
Can the LTC3129IUD-1#PBF operate with input voltages below 2.42V, and what happens during startup?
Yes - the LTC3129IUD-1#PBF starts regulating at 2.42V (min), but once running, it sustains regulation down to 1.92V (bootstrapped operation). During cold start from weak batteries, the RUN pin enables VCC at ~0.9V and full switching at ~1.22V, allowing turn-on even if initial VIN is marginal. If VIN drops below 1.92V while operating, the part enters UVLO and shuts down cleanly with 10nA leakage.
What are the key differences between the LTC3129IUD-1#PBF and the adjustable LTC3129 version?
The LTC3129IUD-1#PBF provides eight factory-programmed fixed output voltages (2.5V–15V) selected via VS1–VS3 logic pins, eliminating external feedback resistors and associated tolerance errors. In contrast, the LTC3129 uses external resistive dividers for fully adjustable VOUT. Both share identical MPPC, Burst Mode, and thermal specs - but the "-1" suffix denotes the fixed-output variant optimized for simplified, high-accuracy designs.
Is the LTC3129IUD-1#PBF pin-compatible with other members of the LTC3129 family, and what package options exist?
Yes - the LTC3129IUD-1#PBF shares identical pinout and functionality with LTC3129EMSE-1#PBF (MSOP) and LTC3129EUD-1#PBF (QFN), differing only in temperature grade (I-grade vs E-grade) and packaging. All variants use the same 16-pin arrangement and support identical VS1–VS3 programming, MPPC, and RUN configurations. No PCB redesign is needed when migrating between QFN and MSOP footprints beyond land pattern adaptation.
LTC3129IUD-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN 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-QFN (3x3)
LTC3129IUD-1#PBF FAQ
1.How can I place an order for LTC3129IUD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3129IUD-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 LTC3129IUD-1#PBF reliable?
The price and inventory of LTC3129IUD-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 LTC3129IUD-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3129IUD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3129IUD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3129IUD-1#PBF?
LTC3129IUD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3129IUD-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 LTC3129IUD-1#PBF?
For technical support, including LTC3129IUD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3129IUD-1#PBF requirements.
6.How does Aetrix verify that LTC3129IUD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3129IUD-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 LTC3129IUD-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3129IUD-1#PBF?
All LTC3129IUD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3129IUD-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 LTC3129IUD-1#PBF part is unused and in its original packaging.
Return procedure for LTC3129IUD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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