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Analog Devices Inc. LTC3103IDD#PBF
- Part No.:
- LTC3103IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3103IDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 300MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:609
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Product details
Overview
LTC3103IDD#PBF 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, operates from 2.5V to 15V input, regulates down to 0.6V output, and achieves 95% peak efficiency with 1.8µA no-load quiescent current in Burst Mode - enabling multi-year operation in energy-harvesting sensor nodes.
For engineers reviewing the LTC3103IDD#PBF datasheet, LTC3103IDD#PBF pinout, LTC3103IDD#PBF application, or LTC3103IDD#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping to the 3mm × 3mm 10-pin DFN, and two rigorously cross-checked alternative parts for low-power buck conversion in industrial IoT and remote sensing designs.
Technical Context
The LTC3103IDD#PBF employs a current-mode architecture with internal N-channel MOSFETs (0.65Ω main switch, 0.85Ω synchronous rectifier) and fixed 1.2MHz PWM frequency in forced continuous mode. Its dual-mode control logic allows user-selectable automatic Burst Mode (1.8µA IQ) or forced continuous operation (low-noise, constant-frequency), with independent RUN comparator threshold (0.80V typ) and MODE pin logic interface.
It integrates thermal shutdown (150°C trip), power-good status (PGOOD with –10% VFB threshold and 2% hysteresis), internal soft-start (1.4ms typ), and slope-compensated current limiting (400mA min peak ILIM). The BST bootstrap circuit enables high-side gate drive, and the exposed-pad DFN package ensures thermal performance with θJA = 58°C/W.
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 regulators. |
| Output Current | 300mA max - sufficient to power microcontrollers, RF transceivers, and analog sensors simultaneously. |
| Quiescent Current (Burst Mode) | 1.8µA typical at no load - extends battery life in intermittently active wireless sensor nodes. |
| Feedback Reference Voltage | 0.600V ±2% - enables precise, resistor-programmable output voltages from 0.6V to 13.8V. |
| Switching Frequency | 1.2MHz fixed in forced continuous mode - allows use of compact, low-profile inductors (e.g., 10µH). |
| Power Good Threshold | –10% VFB (i.e., –60mV at 0.6V ref) - provides reliable system reset signaling under undervoltage conditions. |
| Operating Junction Temp | –40°C to +125°C - qualified for industrial and automotive-adjacent embedded environments. |
Pinout & Package
Package: 10-lead (3mm × 3mm × 0.75mm) plastic DFN with exposed GND pad (Pin 11), thermally enhanced for θJA = 58°C/W. Requires soldering of exposed pad to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main input supply connection | Accepts 2.5V–15V; requires ≥10µF ceramic decoupling adjacent to pin for stability and EMI suppression. |
| SW (Pin 2) | Switch node | Connects to inductor; carries high di/dt switching current; must be routed with minimal loop area. |
| BST (Pin 3) | Bootstrap supply for high-side gate driver | Requires 22nF ceramic capacitor between BST and SW; critical for reliable high-side FET turn-on. |
| GND (Pin 4) | Power ground reference | Primary return path for power stage; connects to exposed pad (Pin 11) for thermal and electrical integrity. |
| PGOOD (Pin 5) | Open-drain power-good status output | Pulls low if VOUT drops >10% below regulation or during thermal/UVLO fault; valid 1ms after enable. |
| VCC (Pin 6) | Internally regulated bias rail | ~3.3V regulated from VIN; powers control circuitry; requires ≥1µF local ceramic decoupling. |
| RUN (Pin 7) | Enable/disable comparator input | Active-high enable; 0.80V threshold with 60mV hysteresis; supports precision UVLO via external divider. |
| FB (Pin 8) | Feedback input to error amplifier | Senses resistive divider output; regulates VOUT to 0.6V reference; input current ≤20nA minimizes divider error. |
| NC (Pin 9) | No-connect terminal | Must be tied to GND per datasheet; not internally connected; prevents floating node noise coupling. |
| MODE (Pin 10) | Operation mode select | High (>1.2V) = Burst Mode; low (<0.5V) = forced continuous; controls trade-off between IQ and ripple/noise. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 1.8µA in Burst Mode - enables >10-year battery life in sub-100µA average-power sensor nodes. |
| Synchronous rectification | Integrated 0.65Ω/0.85Ω N-MOSFETs - eliminates external Schottky loss, achieving 95% peak efficiency at 300mA. |
| User-selectable operating mode | Dual-mode logic control (MODE pin) - lets designers lock out pulse-skipping noise or maximize light-load efficiency per application need. |
| Accurate programmable RUN threshold | 0.80V ±0.05V with 60mV hysteresis - supports robust, resistor-defined input UVLO without external comparators. |
| Integrated power-good monitoring | PGOOD open-drain output with –10% VFB trip and deglitching - provides deterministic system reset signaling under fault conditions. |
Applications
| Remote Sensor Networks | Distributed Power Systems |
|---|---|
Use Scenario: Wireless environmental sensors powered by coin-cell batteries or ambient energy harvesters. IC Role / Device Role / Timing Role: Primary voltage regulator converting harvested microwatts or battery voltage to stable 1.8V/3.3V for MCU and radio. Use Value: 1.8µA quiescent current enables >5-year operation on CR2032; Burst Mode eliminates idle power waste between transmissions. |
Use Scenario: Modular industrial subsystems requiring localized, isolated 3.3V rails from shared 12V/24V backplanes. IC Role / Device Role / Timing Role: Point-of-load (POL) buck converter delivering clean, regulated power to FPGA I/O banks or ADC front-ends. Use Value: Forced continuous mode suppresses switching harmonics near sensitive analog circuits; 1.2MHz operation minimizes filter size. |
| Multicell Battery Regulator | Energy Harvesters |
Use Scenario: Portable medical devices using 3×AA alkaline packs (4.5V–6V) powering low-voltage digital logic. IC Role / Device Role / Timing Role: Main system regulator stepping down variable battery voltage to fixed 2.5V/3.3V while maintaining efficiency across discharge curve. Use Value: Wide 2.5V–15V input range accommodates full battery swing; internal compensation simplifies layout vs. external-compensated controllers. |
Use Scenario: Solar- or thermal-energy-harvested nodes charging supercapacitors and powering intermittent telemetry bursts. IC Role / Device Role / Timing Role: Supercapacitor buffer regulator managing variable input (e.g., 2.8V–12V) to deliver consistent 3.3V output during burst transmission. Use Value: Automatic Burst Mode adapts seamlessly to irregular energy availability; PGOOD signals readiness for data upload. |
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 |
|---|---|---|---|
| TPS62840DRLR | Lower IQ (300nA), smaller 6-pin WSON, but only 200mA output and 2.7V–6.5V input range. | Better for ultra-low-power wearables with tight space constraints; unsuitable for >6.5V inputs or >200mA loads. | Select when IQ <1µA is mandatory and input stays ≤6.5V; verify thermal margin at 200mA in WSON. |
| MAX17690ATP+ | Higher 600mA output, 4.5V–60V input, but 12µA IQ and larger 16-pin TQFN package. | Designed for industrial 24V/48V systems; overqualified for low-voltage battery apps but offers wider VIN and higher current. | Choose for harsher environments requiring >15V input or >300mA; accept higher IQ penalty for ruggedness and headroom. |
Compared with LTC3103IDD#PBF, the TPS62840DRLR trades output current and input range for extreme ultralow IQ, while the MAX17690ATP+ sacrifices quiescent current for industrial-grade voltage range and current capability - making LTC3103IDD#PBF the balanced choice for 2.5V–15V, 300mA, sub-2µA IQ applications.
Availability
LTC3103IDD#PBF is available at Aetrix Electronics and suitable for remote sensor networks, distributed power systems, and energy harvesting applications requiring stable component supply, long-lifecycle assurance, and guaranteed lead-free compliance.
Supply support for LTC3103IDD#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 high-performance analog and power management portfolio. Linear's legacy design ethos emphasizes precision, reliability, and application-specific integration.
The LTC3103 belongs to Linear's ultralow-IQ DC/DC converter family, engineered specifically for battery-constrained and energy-harvesting systems where multi-year operational life and adaptive efficiency modes are essential.
FAQ
What is the absolute maximum input voltage rating for the LTC3103IDD#PBF?
The LTC3103IDD#PBF has an absolute maximum VIN rating of 18V. Exceeding this voltage - even momentarily - may cause permanent damage. The recommended operating input range remains 2.5V to 15V, and the internal UVLO disables operation below 2.1V (typical) to protect downstream circuitry. Always include appropriate input transient protection when operating near the 18V limit.
How does the MODE pin affect efficiency and noise performance in the LTC3103IDD#PBF?
In the LTC3103IDD#PBF, pulling MODE high (>1.2V) enables automatic Burst Mode operation, reducing no-load IQ to 1.8µA but introducing low-frequency output voltage ripple. Pulling MODE low (<0.5V) forces continuous conduction mode, delivering constant 1.2MHz switching with lower ripple and noise - at the cost of ~600µA no-load IQ. The choice directly determines system-level trade-offs between battery life and signal integrity.
Can the LTC3103IDD#PBF start up into a pre-biased output?
Yes, the LTC3103IDD#PBF supports start-up into a pre-biased output. Its internal circuitry prevents reverse current flow during startup, and the soft-start feature ensures controlled ramp-up without output overshoot. This capability is confirmed in the datasheet's "Start-Up into Pre-Biased Output" waveforms (Figures 3103 G14 and G15), making it suitable for hot-swap and redundant power applications.
What is the purpose of the NC pin (Pin 9) on the LTC3103IDD#PBF, and how should it be handled?
Pin 9 of the LTC3103IDD#PBF is designated NC (No Connect) and must be tied to GND per the official datasheet. Although unconnected internally, leaving it floating can introduce noise coupling or parasitic oscillation due to its proximity to sensitive analog nodes like FB and RUN. Grounding ensures electromagnetic compatibility and matches the validated layout practices used in Linear's reference designs.
Does the LTC3103IDD#PBF require an external feedforward capacitor for stability?
The LTC3103IDD#PBF does not require an external feedforward capacitor for basic stability - its internal compensation is fully integrated. However, adding a feedforward capacitor (e.g., 12pF) across the upper feedback resistor improves transient response and phase margin, especially with large output capacitors. The datasheet confirms stable operation without it, but recommends it for demanding load-step applications per Table 3 in the Applications Information section.
LTC3103IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3103IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3103IDD#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 LTC3103IDD#PBF reliable?
The price and inventory of LTC3103IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3103IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3103IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3103IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3103IDD#PBF?
LTC3103IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3103IDD#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 LTC3103IDD#PBF?
For technical support, including LTC3103IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3103IDD#PBF requirements.
6.How does Aetrix verify that LTC3103IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3103IDD#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 LTC3103IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3103IDD#PBF?
All LTC3103IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3103IDD#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 LTC3103IDD#PBF part is unused and in its original packaging.
Return procedure for LTC3103IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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