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Analog Devices Inc. LTC3103EDD#PBF
- Part No.:
- LTC3103EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3103EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 300MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,183
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Product details
Overview
LTC3103EDD#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter optimized for ultralow-quiescent-current operation in battery- and energy-harvesting systems. It delivers up to 300mA output current, supports 2.5V–15V input, regulates down to 0.6V, and achieves 95% peak efficiency with 1.8µA no-load quiescent current in Burst Mode.
For engineers reviewing the LTC3103EDD#PBF datasheet, LTC3103EDD#PBF pinout, LTC3103EDD#PBF application, or LTC3103EDD#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping to the 10-pin 3mm × 3mm DFN, real-world application constraints, and two rigorously cross-checked alternative parts for low-power step-down conversion.
Technical Context
The LTC3103EDD#PBF employs a current-mode control architecture with internal slope compensation to ensure stability across wide duty cycles (up to 92%). It integrates dual N-channel MOSFETs - main switch (RDS(ON) = 0.65Ω) and synchronous rectifier (RDS(ON) = 0.85Ω) - enabling high-efficiency regulation without external diodes.
It offers user-selectable operation modes: automatic Burst Mode (1.8µA IQ, variable-frequency) or forced continuous PWM (1.2MHz fixed frequency, low-noise). The RUN pin provides accurate undervoltage lockout (0.80V threshold, 60mV hysteresis), while PGOOD delivers open-drain power-good status with –10% VFB trip and 2% hysteresis.
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 Voltage Range | 0.6V to 13.8V - adjustable via external resistor divider; 0.6V reference enables low-voltage MCU core rail generation. |
| Max Output Current | 300mA - sufficient for powering microcontrollers, sensors, and RF transceivers in portable instrumentation. |
| Quiescent Current | 1.8µA (Burst Mode, no load) - extends battery life in always-on remote sensor nodes by minimizing standby loss. |
| Switching Frequency | 1.2MHz (forced continuous) - enables use of small, low-profile inductors (e.g., 10µH) and reduces EMI filtering burden. |
| Feedback Reference | 0.600V ±2% - tight tolerance ensures accurate output regulation across temperature (±0.25% drift from –40°C to 125°C). |
| Peak Current Limit | 0.50A - protects against short-circuit and overload while supporting transient load steps up to 300mA. |
Pinout & Package
Package: 10-lead (3mm × 3mm × 0.75mm) plastic DFN with exposed thermal pad (Pin 11 = GND). Requires soldering of exposed pad to PCB ground plane for θJA = 58°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Accepts 2.5V–15V; requires ≥10µF ceramic decoupling adjacent to pin for stable switching operation. |
| SW (Pin 2) | Switch node | Connects to inductor; carries high di/dt; must be routed with minimal loop area to reduce EMI. |
| BST (Pin 3) | Bootstrap supply | Drives high-side gate via 22nF capacitor to SW; enables efficient N-MOSFET top switch operation. |
| GND (Pin 4) | Power ground | Primary return path for power stage; connects to exposed pad (Pin 11) for thermal and electrical integrity. |
| PGOOD (Pin 5) | Open-drain status output | Pulls low if VOUT drops >10% below regulation, during thermal shutdown, or when disabled. |
| VCC (Pin 6) | Internal bias rail | Regulated ~3.3V supply for control circuitry; requires ≥1µF local ceramic decoupling. |
| RUN (Pin 7) | Enable/UVLO comparator input | Enables converter when >0.80V; configurable as precise UVLO using external resistor divider. |
| FB (Pin 8) | Feedback input | Senses resistive divider output; regulates VOUT = 0.6V × (1 + R1/R2); input bias current ≤20nA. |
| NC (Pin 9) | No-connect | Must be tied to GND per datasheet; floating connection may cause instability or latch-up. |
| MODE (Pin 10) | Operation mode select | High (>1.2V) = Burst Mode; low (<0.5V) = forced continuous; controls noise vs. light-load efficiency trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 1.8µA in Burst Mode - enables multi-year operation from coin cells or energy harvesters with µW-level sources. |
| Synchronous rectification | Integrated N-MOSFETs eliminate external Schottky losses, delivering up to 95% efficiency at 300mA. |
| User-selectable operating mode | Hardware-configurable MODE pin allows deterministic choice between low-noise PWM or high-efficiency Burst Mode. |
| Accurate power-good signaling | PGOOD asserts within 1ms of enable and provides fault indication for undervoltage, overtemperature, and regulation loss. |
| Thermal shutdown protection | Disables switching at ~150°C and auto-restarts at ~130°C - prevents permanent damage during sustained overload. |
Applications
| Remote Sensor Networks | Distributed Power Systems |
|---|---|
Use Scenario: Wireless environmental sensors powered by solar cells or thermoelectric generators with intermittent, low-power energy sources. IC Role / Device Role / Timing Role: Primary voltage regulator converting harvested microwatts into stable 1.8V or 3.3V for ultra-low-power MCU and BLE radio. Use Value: 1.8µA quiescent current minimizes drain on weak sources; Burst Mode maintains regulation during long idle periods without brownouts. |
Use Scenario: Industrial IoT nodes distributed across machinery, each requiring isolated, regulated 3.3V from a shared 12V bus. IC Role / Device Role / Timing Role: Local point-of-load (POL) regulator providing clean, ripple-free 3.3V to microcontroller and analog front-end. Use Value: Forced continuous mode eliminates burst-related noise coupling into sensitive ADC or sensor circuits. |
| Multicell Battery Regulator | Energy Harvesters |
Use Scenario: Portable medical devices using 3×AA alkaline batteries (4.5V–6.0V fresh) powering a 2.2V ASIC core. IC Role / Device Role / Timing Role: Efficient step-down converter maintaining constant output despite battery voltage decay over discharge cycle. Use Value: Wide 2.5V–15V input range accommodates full battery voltage swing; 0.6V reference enables precise low-VOUT setting. |
Use Scenario: Piezoelectric vibration harvesters generating <100µW average power feeding a 1.2V logic rail. IC Role / Device Role / Timing Role: Ultralow-IQ buck converter accumulating charge in storage capacitor and regulating output only during active bursts. Use Value: 1.8µA sleep current ensures net energy gain even under sub-100µW input; integrated soft-start prevents startup surge. |
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), smaller 1.5mm × 2.0mm WSON, but max IOUT = 1A and VIN = 1.8V–6.5V - narrower input range than LTC3103EDD#PBF. | Best suited for single-cell Li-ion or coin-cell applications where input never exceeds 6.5V and sub-1A load suffices. | Select TPS62840DRVR only if input voltage stays ≤6.5V and ultra-deep sleep (≤500nA) is prioritized over 15V input capability. |
| MAX17690ATP+T | Higher IQ (12µA), wider VIN (4.5V–60V), same 300mA IOUT, but no Burst Mode - uses pulse-skipping at light loads. | Targeted at industrial 24V/48V bus systems requiring robustness, not energy harvesting or battery longevity. | Choose MAX17690ATP+T only when input exceeds 15V or when high-voltage industrial compliance (e.g., EN 55022 Class B) is mandatory. |
Compared with TPS62840DRVR and MAX17690ATP+T, the LTC3103EDD#PBF uniquely balances 15V input capability, 1.8µA quiescent current, and hardware-selectable Burst/continuous modes - making it irreplaceable in multicell battery and ambient energy harvesting designs where both voltage range and microamp-level sleep current are non-negotiable.
Availability
LTC3103EDD#PBF is available at Aetrix Electronics and suitable for remote sensor networks, distributed power systems, and energy harvester designs requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LTC3103EDD#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 ICs including the LTC3103 series.
The LTC3103 belongs to Linear's ultralow-power DC/DC converter family, specifically engineered for energy-constrained applications such as battery-powered instrumentation, wireless sensor nodes, and ambient energy harvesting systems.
FAQ
What is the absolute maximum input voltage rating for the LTC3103EDD#PBF?
The LTC3103EDD#PBF has an absolute maximum VIN rating of 18V. Exceeding this voltage - even momentarily - risks permanent damage. The recommended operating input range remains 2.5V to 15V, and the internal undervoltage lockout activates at ~2.1V to prevent erratic startup. Always include appropriate input transient suppression if system-level surges exceed 18V.
How does the MODE pin affect efficiency and noise in the LTC3103EDD#PBF?
In the LTC3103EDD#PBF, pulling MODE high (>1.2V) enables automatic Burst Mode operation, reducing no-load quiescent current to 1.8µA but introducing low-frequency output voltage ripple. Pulling MODE low (<0.5V) forces continuous 1.2MHz PWM operation, eliminating burst ripple but increasing no-load IQ to 600µA. The choice directly trades off battery life versus signal integrity.
Can the LTC3103EDD#PBF start up into a pre-biased output?
Yes, the LTC3103EDD#PBF supports start-up into a pre-biased output. Its internal BST voltage monitor and controlled soft-start sequence prevent reverse current flow during startup. Verified waveforms in the datasheet (Figure 3103 G13) confirm clean, monotonic VOUT rise without undershoot or oscillation when COUT is pre-charged to 2.2V before enable.
What is the function of the NC pin (Pin 9) on the LTC3103EDD#PBF?
Pin 9 of the LTC3103EDD#PBF is designated NC (No Connect) and must be tied to GND per the official datasheet. Leaving it floating may cause unpredictable behavior due to capacitive coupling or internal leakage paths. This requirement applies strictly to the LTC3103EDD#PBF in its 10-pin DFN package and is not optional.
Does the LTC3103EDD#PBF include internal compensation?
Yes, the LTC3103EDD#PBF features fully internal compensation - no external compensation components are required. Its current-mode architecture incorporates fixed slope compensation and a compensated error amplifier, enabling stable operation with standard output capacitor values (e.g., 22µF–47µF ceramic) and typical inductor selections (e.g., 10µH).
LTC3103EDD#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)
LTC3103EDD#PBF FAQ
1.How can I place an order for LTC3103EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3103EDD#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 LTC3103EDD#PBF reliable?
The price and inventory of LTC3103EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3103EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3103EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3103EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3103EDD#PBF?
LTC3103EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3103EDD#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 LTC3103EDD#PBF?
For technical support, including LTC3103EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3103EDD#PBF requirements.
6.How does Aetrix verify that LTC3103EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3103EDD#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 LTC3103EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3103EDD#PBF?
All LTC3103EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3103EDD#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 LTC3103EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3103EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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