My Inquiry
My Account
Analog Devices Inc. LTC3129IMSE-1#PBF
- Part No.:
- LTC3129IMSE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3129IMSE-1#PBF.pdf
- Description:
- IC REG BCK BST PROG 200MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,540
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3129IMSE-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 seamless mode transitions-ideal for energy-harvesting wireless sensor nodes powered by photovoltaic or low-voltage battery sources.
For engineers reviewing the LTC3129IMSE-1#PBF datasheet, LTC3129IMSE-1#PBF pinout, LTC3129IMSE-1#PBF application, or LTC3129IMSE-1#PBF equivalent, key selection criteria include its 1.92V–15V input range, thermally enhanced 16-lead MSOP package, MPPC programmability for solar panels, Burst Mode efficiency at microamp loads, and internal voltage divider eliminating external feedback resistors.
Technical Context
The LTC3129IMSE-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 glitches.
Operation includes selectable fixed-frequency PWM (1.2MHz) or ultralow-power Burst Mode (1.3µA IQ), with MPPC servoing VIN to 1.175V × (1 + R5/R6) for optimal power extraction from non-ideal sources. The RUN pin provides precise turn-on control (1.22V rising threshold, 80mV hysteresis), while PGOOD indicates regulated output status with –7.5% dropout threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1.92V–15V after startup; enables operation from single AA/AAA batteries or wide-input industrial rails. |
| VOUT Options | Eight fixed outputs (2.5V, 3.3V, 4.1V, 5.0V, 6.9V, 8.2V, 12V, 15V) set via VS1–VS3 pins-no external resistors required. |
| Quiescent Current | 1.3µA in Burst Mode-extends battery life in always-on wireless sensors and IoT endpoints. |
| Switching Frequency | 1.2MHz nominal-permits use of compact 10µH inductors and ceramic capacitors for minimal PCB footprint. |
| Output Current | 200mA in buck mode; supports moderate-power RF transceivers, microcontrollers, and analog front-ends. |
| MPPC Input | 1.175V reference with <10nA input current-enables high-impedance resistor dividers for solar panel MPPT without loading source. |
| Shutdown Current | 10nA-ensures near-zero leakage during deep sleep or system standby states. |
| Package | 16-lead MSOP (3mm × 4.9mm), exposed PGND pad-optimized for thermal performance in space-constrained designs. |
Pinout & Package
Package: 16-lead plastic MSOP with exposed PGND pad (Pin 17), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 (Pin 15) | High-side NMOS gate drive supply | Connects via 22nF capacitor to SW1; sustains gate drive during buck operation. |
| VIN (Pin 16) | Main input supply | Accepts 1.92V–15V; requires ≥4.7µF ceramic decoupling close to pin. |
| VCC (Pin 1) | Internal LDO output | 4.1V regulated supply for internal circuitry; can be back-driven up to 5.5V. |
| RUN (Pin 2) | Enable comparator input | 1.22V rising threshold enables switching; allows programmable VIN turn-on using resistor divider. |
| MPPC (Pin 3) | Maximum Power Point Control input | 1.175V reference input; sets VIN regulation point for photovoltaic or weak-source optimization. |
| GND (Pin 4) | Signal ground reference | Low-impedance return path for analog circuitry; separate from PGND but tied on PCB. |
| VS3–VS1 (Pins 5–7) | Output voltage select inputs | Digital inputs (0/VCC) selecting one of eight fixed VOUT values per Table 1. |
| PWM (Pin 8) | Mode select | Low = Burst Mode (1.3µA IQ); High = fixed 1.2MHz PWM (low-noise operation). |
| PGOOD (Pin 9) | Power-good open-drain flag | Pulls low when VOUT drops >7.5% below programmed value; requires external pull-up. |
| VOUT (Pin 10) | Regulated output | Delivers selected fixed voltage; requires ≥4.7µF ceramic output capacitance. |
| BST2 (Pin 11) | High-side NMOS gate drive supply | Connects via 22nF capacitor to SW2; sustains gate drive during boost operation. |
| SW2 (Pin 12) | Boost-mode switch node | Connects to inductor; short/wide trace minimizes EMI and conduction loss. |
| PGND (Pin 13) | Power ground | Primary return for high-current switches; must connect to exposed pad and system ground. |
| SW1 (Pin 14) | Buck-mode switch node | Connects to inductor; short/wide trace critical for efficiency and thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Eight fixed VOUT options | Eliminates external feedback resistors and associated layout sensitivity-reduces BOM count and improves production yield. |
| 1.3µA Burst Mode IQ | Extends operational lifetime in battery-powered applications where load duty cycle is low (e.g., periodic sensor wake-ups). |
| Programmable MPPC | Enables direct integration with solar cells or thermoelectric generators without external MPPT controllers or op-amps. |
| Accurate RUN threshold (1.22V ±60mV) | Allows predictable, repeatable system power-up from weak or variable sources like depleted batteries or harvested energy. |
| Seamless buck-boost transitions | Prevents output voltage glitches during VIN crossing VOUT-critical for noise-sensitive analog or RF circuits. |
| Thermally enhanced MSOP | θJA = 40°C/W enables sustained 200mA output in ambient temperatures up to 85°C without heatsinking. |
Applications
| Industrial Wireless Sensor Nodes | Solar Panel Post-Regulator/Charger |
|---|---|
Use Scenario: Battery- or energy-harvesting–powered temperature/humidity sensors transmitting data every 5 minutes via LoRaWAN or BLE. IC Role / Device Role / Timing Role: Primary DC/DC regulator converting variable 1.8–5V harvested voltage to stable 3.3V for MCU and radio. Use Value: 1.3µA quiescent current extends multi-year battery life; MPPC maximizes energy capture from small PV cells under partial shading. |
Use Scenario: Indoor light-powered wearable health monitor using miniature amorphous silicon solar cell. IC Role / Device Role / Timing Role: MPPT-enabled post-regulator maintaining constant 5V output despite rapidly varying indoor light intensity. Use Value: MPPC pin accepts high-impedance divider to track changing Voc; 1.92V start-up enables operation even under dim lighting conditions. |
| Intrinsically Safe Power Supplies | Avionics-Grade Wireless Headsets |
Use Scenario: Hazardous-area gas detector requiring certified low-energy power architecture compliant with IEC 60079-11. IC Role / Device Role / Timing Role: Isolated secondary-side regulator delivering ≤100mW at 3.3V from intrinsically safe barrier supply. Use Value: 10nA shutdown current ensures no hazardous energy accumulation; 125°C max junction rating supports Class T4 ambient requirements. |
Use Scenario: Crew-worn headset with Bluetooth audio and active noise cancellation operating from dual AAA cells. IC Role / Device Role / Timing Role: Efficient buck-boost supplying 3.3V to codec and 5V to amplifier from 2.4–4.2V battery stack. Use Value: Seamless VIN-to-VOUT crossover prevents audio dropouts during battery discharge; 1.2MHz switching avoids audible noise in sensitive analog 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 |
|---|---|---|---|
| LTC3129EMSE-1#PBF | Same functionality and pinout; rated for 0°C to 85°C junction temperature (vs. –40°C to 125°C for LTC3129IMSE-1#PBF). | Suitable for commercial-grade consumer electronics but not extended-temperature industrial or avionics use. | Select when ambient operating temperature remains below 85°C and cost sensitivity outweighs extended temp qualification. |
| LTC3129IUD-1#PBF | Identical electrical specs and temperature rating, but in 3mm × 3mm QFN package (vs. MSOP); exposes thermal pad on bottom. | Better thermal performance (θJA = 68°C/W vs. 40°C/W) but requires rework for board layout and soldering process. | Choose for higher-power density designs where PCB real estate is constrained and thermal management via PCB copper is feasible. |
Compared with LTC3129EMSE-1#PBF, the LTC3129IMSE-1#PBF offers guaranteed operation down to –40°C and up to 125°C-critical for outdoor sensors or automotive-adjacent systems-while compared with LTC3129IUD-1#PBF, it delivers identical reliability in a legacy-compatible MSOP footprint that simplifies assembly and avoids QFN reflow challenges.
Availability
LTC3129IMSE-1#PBF is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, solar-powered IoT devices, and intrinsically safe instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3129IMSE-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 product support, documentation, and manufacturing continuity for all Linear-branded power management ICs.
The LTC3129-1 series was designed specifically for ultra-low-power, wide-input-range energy harvesting applications-emphasizing micropower operation, programmable MPPT, and seamless buck-boost regulation in compact packages.
FAQ
What is the minimum input voltage required for startup of the LTC3129IMSE-1#PBF?
The LTC3129IMSE-1#PBF requires a minimum VIN of 2.42V to initiate startup. After startup, it sustains regulation down to 1.92V when back-driven-enabling operation from partially discharged alkaline or lithium batteries. This specification is verified across the –40°C to 125°C temperature range for the I-grade part.
How does the MPPC function work in the LTC3129IMSE-1#PBF?
The MPPC pin on the LTC3129IMSE-1#PBF references an internal 1.175V threshold. When connected to a resistor divider from VIN to GND, it regulates VIN to 1.175V × (1 + R5/R6), maximizing power extraction from photovoltaic cells or other high-impedance sources. Input bias current is under 10nA, preserving accuracy with high-value resistors.
Can the LTC3129IMSE-1#PBF operate with an output voltage higher than the input voltage?
Yes-the LTC3129IMSE-1#PBF is a true buck-boost converter capable of regulating VOUT both above and below VIN. In boost mode, it delivers up to 200mA at VOUT = 15V from VIN as low as 2.42V, using its four-NMOS switch architecture and internal charge pumps (BST1/BST2) to sustain gate drive.
What is the purpose of the exposed pad on the LTC3129IMSE-1#PBF MSOP package?
The exposed pad (Pin 17) on the LTC3129IMSE-1#PBF is designated PGND and must be soldered to the PCB ground plane. It serves dual functions: providing a low-inductance, high-current return path for power switches and conducting heat away from the die-reducing θJA to 40°C/W and enabling full 200mA output at elevated ambient temperatures.
How do I select a fixed output voltage on the LTC3129IMSE-1#PBF?
Use the three digital pins VS1 (Pin 9), VS2 (Pin 8), and VS3 (Pin 7) to select one of eight factory-programmed VOUT values. Tie each pin to GND (0) or VCC (1) per Table 1 in the datasheet-for example, VS3=0, VS2=1, VS1=1 selects 5.0V. Floating these pins is prohibited; unused pins must be terminated to GND or VCC.
LTC3129IMSE-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
LTC3129IMSE-1#PBF FAQ
1.How can I place an order for LTC3129IMSE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3129IMSE-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 LTC3129IMSE-1#PBF reliable?
The price and inventory of LTC3129IMSE-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 LTC3129IMSE-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3129IMSE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3129IMSE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3129IMSE-1#PBF?
LTC3129IMSE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3129IMSE-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 LTC3129IMSE-1#PBF?
For technical support, including LTC3129IMSE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3129IMSE-1#PBF requirements.
6.How does Aetrix verify that LTC3129IMSE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3129IMSE-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 LTC3129IMSE-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3129IMSE-1#PBF?
All LTC3129IMSE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3129IMSE-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 LTC3129IMSE-1#PBF part is unused and in its original packaging.
Return procedure for LTC3129IMSE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3129IMSE-1#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
