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Analog Devices Inc. LTC3103IDD#TRPBF
- Part No.:
- LTC3103IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3103IDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,142
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Product details
Overview
LTC3103IDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter optimized for ultralow-quiescent-current battery-powered systems. It delivers up to 300mA output current, supports 2.5V–15V input and 0.6V–13.8V adjustable output, and operates in automatic Burst Mode (1.8µA no-load IQ) or forced continuous mode (1.2MHz fixed frequency). It is used in energy harvesting nodes where standby efficiency and regulated low-power rail generation are critical.
For engineers reviewing the LTC3103IDD#TRPBF datasheet, LTC3103IDD#TRPBF pinout, LTC3103IDD#TRPBF application, or LTC3103IDD#TRPBF equivalent, key selection criteria include its 1.8µA quiescent current in Burst Mode, integrated power good flag, programmable RUN threshold, thermal shutdown protection, and compatibility with small 10-pin DFN (3mm × 3mm) layouts for space-constrained remote sensors.
Technical Context
The LTC3103IDD#TRPBF employs a current-mode control architecture with internal slope compensation to ensure stability across wide duty cycles (up to 92%). Its dual-mode operation-Burst Mode for sub-µA light-load IQ and forced continuous PWM for low-noise 1.2MHz switching-is selected via the MODE pin voltage (≥1.2V or ≤0.5V), enabling precise trade-offs between efficiency and EMI.
It integrates two N-channel MOSFETs (0.65Ω main switch, 0.85Ω synchronous rectifier), a 0.6V ±2% feedback reference, accurate RUN comparator (0.80V threshold, 60mV hysteresis), and open-drain PGOOD output that asserts low when VOUT drops >10% below regulation or during thermal/UVLO faults. The BST bootstrap circuit enables high-side gate drive without external charge pumps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 15V - supports single Li-ion, multicell alkaline, or supercapacitor inputs without external pre-regulation. |
| Output Current | 300mA maximum - sufficient to power microcontrollers, RF transceivers, and analog front-ends in low-duty-cycle IoT nodes. |
| Quiescent Current (Burst) | 1.8µA typical at no load - extends battery life in years-long deployments such as structural health monitors. |
| Switching Frequency | 1.2MHz fixed in forced continuous mode - enables use of compact 10µH inductors and reduces EMI filtering burden. |
| Feedback Reference | 0.600V ±2% - allows precise output setting down to 0.6V with standard resistor dividers; line regulation <0.05%/V. |
| Power Good Threshold | –10% VFB falling threshold with 2% hysteresis - provides reliable system reset signaling without external comparators. |
| Thermal Shutdown | 150°C trip, 130°C recovery - protects against sustained overload in sealed enclosures without derating. |
Pinout & Package
Package: 10-lead (3mm × 3mm × 0.75mm) plastic DFN with exposed GND pad (Pin 11), rated for –40°C to +125°C junction temperature. Thermal resistance θJA = 58°C/W; requires soldered exposed pad for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Main input supply | Accepts 2.5V–15V; must be decoupled with ≥10µF ceramic capacitor placed adjacent to pin. |
| SW (2) | Switch node | Connects to inductor; carries high di/dt; internal main and sync FET drains meet here. |
| BST (3) | Bootstrap supply | Drives high-side gate; requires 22nF capacitor between BST and SW; critical for start-up into pre-biased rails. |
| GND (4) | Power ground | Primary return path for power devices; connects to exposed pad (Pin 11) for lowest impedance. |
| PGOOD (5) | Open-drain status output | Pulls low if VOUT falls >10%, during thermal shutdown, or UVLO; valid 1ms after enable. |
| VCC (6) | Internal bias rail | Regulated ~3.3V output from VIN; powers control logic; decouple with ≥1µF ceramic cap. |
| RUN (7) | Enable comparator input | 0.80V threshold; 60mV hysteresis; tie to VIN or resistor divider for precise undervoltage lockout. |
| FB (8) | Feedback input | Senses resistive divider output; error amplifier regulates VOUT to 0.6V on this pin. |
| NC (9) | No connect | Must be tied to GND; not internally connected; improves thermal conduction when grounded. |
| MODE (10) | Operation mode select | ≥1.2V = Burst Mode (ultralow IQ); ≤0.5V = forced continuous (low-noise 1.2MHz PWM). |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 1.8µA in Burst Mode - enables multi-year operation from coin cells or harvested energy sources. |
| Synchronous rectification | Integrated 0.65Ω/0.85Ω N-MOSFETs - eliminates external Schottky losses, achieving up to 95% peak efficiency. |
| User-selectable operating mode | Hardware-configurable MODE pin - avoids firmware dependency for noise vs. efficiency trade-off. |
| Accurate RUN comparator | 0.80V ±0.05V threshold with 60mV hysteresis - replaces external UVLO ICs in battery management circuits. |
| Integrated soft-start | 1.4ms typical duration - prevents inrush current and ensures monotonic VOUT ramp without external components. |
| Robust fault protection | Thermal shutdown, cycle-by-cycle current limit (≥400mA), and PGOOD reporting - reduces need for external supervision. |
Applications
| Remote Sensor Networks | Distributed Power Systems |
|---|---|
|
Use Scenario: Wireless soil moisture and temperature nodes powered by AA batteries in agricultural fields, transmitting data every 15 minutes. IC Role / Device Role / Timing Role: Primary 3.3V regulator converting 3.0–4.2V battery voltage while maintaining <2µA sleep current between transmissions. Use Value: Extends battery life beyond 5 years by minimizing no-load IQ and enabling fast wake-up from deep sleep via RUN pin control. |
Use Scenario: Modular industrial sensor hubs distributing 1.8V/3.3V rails to multiple I²C peripherals from a shared 12V backplane. IC Role / Device Role / Timing Role: Point-of-load converter delivering stable 300mA per module with tight load regulation (<±1%) across varying bus impedance. Use Value: Eliminates need for discrete MOSFETs and controllers; integrated PGOOD simplifies system-level power sequencing. |
| Multicell Battery Regulator | Energy Harvesters |
|
Use Scenario: Portable medical patch using three alkaline cells (4.5V nominal) to power a low-power MCU and BLE radio. IC Role / Device Role / Timing Role: Efficient buck converter stepping 4.5–6.0V down to 2.2V, dynamically switching between Burst and continuous modes during active transmission. Use Value: Maintains >90% efficiency across full load range (10µA–300mA), reducing heat buildup in wearable form factors. |
Use Scenario: Indoor light-energy harvester powering an environmental sensor using amorphous silicon PV cell (0.5–5V output). IC Role / Device Role / Timing Role: Ultralow-IQ regulator accepting highly variable input, storing energy in supercapacitor, and delivering regulated 3.3V bursts. Use Value: Start-up capability down to 2.5V and 1.8µA sleep current maximize usable energy from intermittent sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DRVR | Lower IQ (300nA), but max 200mA output and narrower 1.8–6.5V input range; no PGOOD or RUN pin. | Better for ultra-low-power sub-200mA applications with stable low-voltage sources (e.g., single LiFePO₄). | Select TPS62840DRVR only if load current ≤200mA and system lacks need for fault reporting or precise enable control. |
| MAX17222ELT+T | 1.4µA IQ, 400mA output, but no MODE pin selection - fixed Burst Mode only; no PGOOD or thermal shutdown. | Suitable for cost-sensitive, non-safety-critical energy harvesters where continuous-mode noise is not a concern. | Choose MAX17222ELT+T when design prioritizes minimum BOM count over operational flexibility or system monitoring. |
Compared with TPS62840DRVR and MAX17222ELT+T, the LTC3103IDD#TRPBF uniquely balances ultralow IQ, 300mA capability, dual-mode control, and integrated protection - making it the only option among the three supporting both high-reliability fault reporting and adaptive efficiency optimization in one package.
Availability
LTC3103IDD#TRPBF is available at Aetrix Electronics and suitable for remote sensor networks, distributed power systems, and energy harvesting applications requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LTC3103IDD#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 its legacy of high-performance power management ICs with rigorous characterization and automotive/industrial qualification.
The LTC3103 belongs to Linear's ultralow-quiescent-current DC/DC converter family, designed specifically for battery- and energy-harvesting-powered systems where multi-year operation and reliable cold-start capability are mandatory.
FAQ
What is the minimum input voltage required for the LTC3103IDD#TRPBF to start switching?
The LTC3103IDD#TRPBF requires a minimum input voltage of 2.5V to initiate regulation after startup. Its internal undervoltage lockout (UVLO) disables operation if VIN drops below 2.1V (typical), and the device will restart only when VIN rises above 2.5V due to 400mV hysteresis. This ensures stable operation across the full 2.5V–15V input range specified for the LTC3103IDD#TRPBF.
How does the MODE pin affect efficiency and noise performance of the LTC3103IDD#TRPBF?
The MODE pin directly selects between two distinct operating modes: pulling MODE ≥1.2V enables automatic Burst Mode, reducing no-load IQ to 1.8µA but introducing low-frequency output ripple; pulling MODE ≤0.5V forces continuous 1.2MHz PWM, eliminating burst ripple but raising no-load IQ to 600µA. This hardware-selectable trade-off lets designers optimize the LTC3103IDD#TRPBF for either battery longevity or EMI-sensitive signal chains without firmware changes.
Can the LTC3103IDD#TRPBF safely start up into a pre-biased output voltage?
Yes, the LTC3103IDD#TRPBF supports start-up into a pre-biased output. Its BST pin includes a dedicated comparator that verifies sufficient bootstrap capacitor voltage before enabling the high-side switch, preventing reverse current flow. Application Note DC2227 confirms robust pre-bias start-up behavior for the LTC3103IDD#TRPBF, even with VOUT initially at 3.3V while VIN ramps from 0V.
What is the purpose of the NC pin (Pin 9) on the LTC3103IDD#TRPBF, and how should it be handled?
Pin 9 of the LTC3103IDD#TRPBF is a no-connect terminal with no internal connection. Per the datasheet, it must be tied to GND to improve thermal conduction through the package and reduce θJA. Leaving Pin 9 floating may degrade thermal performance and is not recommended in production designs using the LTC3103IDD#TRPBF.
Does the LTC3103IDD#TRPBF provide short-circuit protection, and how does it behave under output fault conditions?
Yes, the LTC3103IDD#TRPBF includes short-circuit protection. When VOUT collapses below 0.3V, the controller reduces switching frequency to ~300kHz to limit inductor current runaway. Simultaneously, PGOOD pulls low to signal the fault, and thermal shutdown activates if die temperature exceeds 150°C. Recovery occurs automatically once the short is removed and temperature falls to ~130°C - all without requiring external circuitry for the LTC3103IDD#TRPBF.
LTC3103IDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 13.8V
- Current - Output:
- 300mA
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3103IDD#TRPBF FAQ
1.How can I place an order for LTC3103IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3103IDD#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 LTC3103IDD#TRPBF reliable?
The price and inventory of LTC3103IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3103IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3103IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3103IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3103IDD#TRPBF?
LTC3103IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3103IDD#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 LTC3103IDD#TRPBF?
For technical support, including LTC3103IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3103IDD#TRPBF requirements.
6.How does Aetrix verify that LTC3103IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3103IDD#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 LTC3103IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3103IDD#TRPBF?
All LTC3103IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3103IDD#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 LTC3103IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3103IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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