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Analog Devices Inc. LTC3103IMSE#PBF
- Part No.:
- LTC3103IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3103IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 300MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:370
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Product details
Overview
LTC3103IMSE#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 LTC3103IMSE#PBF datasheet, LTC3103IMSE#PBF pinout, LTC3103IMSE#PBF application, or LTC3103IMSE#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (Burst vs. forced continuous), real-world efficiency curves, and two rigorously cross-checked alternative parts for low-power buck conversion.
Technical Context
The LTC3103IMSE#PBF employs a current-mode control architecture with internal slope compensation to ensure stability across wide duty cycles (up to 92%). Its dual-mode operation-user-selectable via the MODE pin-enables either automatic Burst Mode (1.8µA IQ, variable-frequency) or forced continuous PWM (1.2MHz fixed frequency, low-noise).
It integrates both N-channel main switch (RDS(ON) = 0.65Ω) and synchronous rectifier (RDS(ON) = 0.85Ω), features an accurate 0.6V feedback reference (±2% over temperature), and includes thermal shutdown (150°C trip), power-good monitoring (–10% VFB threshold), and programmable RUN comparator (0.80V typical threshold, 60mV hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 15V - supports multicell Li-ion, supercapacitors, and energy harvesters without external LDO pre-regulation. |
| Output Voltage Range | 0.6V to 13.8V - adjustable via external resistor divider; 0.6V reference enables sub-1V core rail generation. |
| Max Output Current | 300mA - sufficient for microcontrollers, RF transceivers, and sensor nodes with bursty load profiles. |
| Quiescent Current (Burst) | 1.8µA - enables multi-year battery life in always-on IoT endpoints with intermittent activity. |
| Oscillator Frequency | 1.2MHz (fixed, forced continuous) - allows use of small, low-profile inductors (e.g., 10µH) and reduces EMI filtering burden. |
| Feedback Reference | 0.600V ±2% - high-accuracy reference minimizes output voltage drift across temperature and line/load variations. |
| Power Good Threshold | –10% of VFB (i.e., –60mV) - provides reliable system-level power sequencing and fault detection. |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm × 1.1mm), exposed pad (Pin 11) tied to GND for thermal performance. θJA = 40°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Main input supply | Accepts 2.5V–15V; requires ≥10µF ceramic decoupling adjacent to pin for stability and EMI suppression. |
| SW (2) | Switch node | Connects to inductor; carries high di/dt switching current; must be routed with minimal loop area to reduce radiated noise. |
| BST (3) | Bootstrap supply | Drives high-side gate via 22nF capacitor to SW; critical for proper high-side MOSFET turn-on above VIN. |
| GND (4) | Power ground | Primary return path for power switches; connects to exposed pad (Pin 11) for optimal thermal conduction. |
| PGOOD (5) | Open-drain status output | Pulls low if VOUT drops >10% below regulation, during thermal shutdown, or UVLO - used for system enable sequencing. |
| VCC (6) | Internal bias rail | Regulated ~3.3V supply derived from VIN; powers control circuitry; requires ≥1µF local ceramic decoupling. |
| RUN (7) | Enable/UVLO comparator input | Enables IC when >0.80V; configurable as precision undervoltage lockout using external resistor divider. |
| FB (8) | Feedback input | Monitors resistive divider from VOUT; error amplifier compares to 0.6V reference to regulate output voltage. |
| NC (9) | No-connect | Must be tied to GND per datasheet - floating NC can cause instability or ESD susceptibility. |
| MODE (10) | Operation mode select | High (>1.2V) = Burst Mode; low (<0.5V) = forced continuous - determines tradeoff between IQ and output ripple/noise. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 1.8µA in Burst Mode enables >10-year shelf life in coin-cell-powered remote sensors. |
| Synchronous rectification | Integrated 0.65Ω/0.85Ω N-MOSFET pair eliminates external Schottky loss, enabling >90% efficiency at 10mA loads. |
| User-selectable operating mode | Single MODE pin toggles between Burst Mode (efficiency-optimized) and forced continuous (noise-optimized) - no firmware or external logic required. |
| Accurate RUN comparator | 0.80V threshold with 60mV hysteresis allows precise, stable input UVLO without external components. |
| Integrated soft-start | 1.4ms nominal duration prevents inrush current, ensures monotonic VOUT rise, and maintains regulation during startup transients. |
Applications
| Remote Sensor Networks | Distributed Power Systems |
|---|---|
Use Scenario: Wireless environmental sensor node powered by AA batteries or thermoelectric harvester, transmitting data every 5 minutes. IC Role / Device Role / Timing Role: Primary step-down regulator converting 3.6V–12V source to stable 1.8V or 3.3V MCU/radio rail. Use Value: 1.8µA quiescent current extends battery life beyond 5 years; Burst Mode eliminates switching noise during sleep, preserving ADC accuracy. | Use Scenario: Industrial field device with multiple isolated subsystems requiring independent 3.3V, 5V, and 12V rails from a common 24V bus. IC Role / Device Role / Timing Role: Point-of-load (POL) buck converter delivering 300mA to FPGA I/O banks or analog front-end circuits. Use Value: Wide 2.5V–15V input range accommodates brownout conditions; PGOOD output enables coordinated power-up sequencing across distributed modules. |
| Multicell Battery Regulator | Energy Harvesters |
Use Scenario: Portable medical monitor using 3× alkaline cells (4.5V–6V) powering low-power ARM Cortex-M0+ MCU and BLE radio. IC Role / Device Role / Timing Role: Main system regulator stepping down varying battery voltage to constant 3.0V for digital logic and analog sensors. Use Value: Input UVLO (2.1V) prevents deep discharge; internal compensation eliminates need for external compensation network - saves board space and BOM cost. | Use Scenario: Solar-powered soil moisture sensor harvesting µW-level energy from miniature PV cell, storing in supercapacitor. IC Role / Device Role / Timing Role: Supercapacitor-to-load regulator maintaining stable 2.2V rail despite highly variable input (0.8V–5.5V) and intermittent charge cycles. Use Value: 2.5V minimum start-up voltage and 1.8µA sleep current maximize usable harvested energy; automatic Burst Mode adapts seamlessly to ultra-low, sporadic power availability. |
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 |
|---|---|---|---|
| TPS62840DLCR | Lower IQ (300nA), smaller 1.5mm × 2.0mm DFN, but max 200mA output and narrower 1.8V–6.5V input range. | Better for coin-cell wearables; unsuitable for 12V input or >200mA loads like RF transceivers. | Select TPS62840DLCR only when IQ <500nA is mandatory and load ≤200mA - not a drop-in replacement for LTC3103IMSE#PBF. |
| MAX17690ATP+ | Higher 600mA output, wider 4.5V–60V input, but IQ = 2.5mA - 1400× higher than LTC3103IMSE#PBF in sleep. | Designed for industrial 24V/48V systems; inappropriate for battery longevity-critical designs. | Choose MAX17690ATP+ only for high-voltage, high-current industrial POL where ultralow IQ is secondary to robustness. |
Compared with TPS62840DLCR and MAX17690ATP+, the LTC3103IMSE#PBF uniquely balances 300mA capability, 15V input support, and 1.8µA IQ - making it the only viable option for mid-power energy-harvesting and long-life battery systems requiring both headroom and efficiency.
Availability
LTC3103IMSE#PBF is available at Aetrix Electronics and suitable for remote sensor networks, distributed power systems, and energy harvesting applications requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term obsolescence management.
Supply support for LTC3103IMSE#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 the LTC portfolio.
The LTC3103IMSE#PBF belongs to Linear's ultralow-power DC/DC converter family, designed specifically for energy-constrained systems including battery-powered IoT nodes, wireless sensors, and ambient energy harvesters.
FAQ
What is the guaranteed operating junction temperature range for the LTC3103IMSE#PBF?
The LTC3103IMSE#PBF is guaranteed over the full –40°C to 125°C operating junction temperature range. This "I-grade" rating is explicitly confirmed in the Order Information table and Electrical Characteristics notes, distinguishing it from the "E-grade" (0°C to 85°C) variants. Thermal resistance is θJA = 40°C/W for the MSOP package, enabling reliable operation in sealed enclosures or high-ambient environments when properly mounted to a thermal pad.
How does the MODE pin affect efficiency and noise performance in the LTC3103IMSE#PBF?
The MODE pin directly selects between two mutually exclusive operating modes in the LTC3103IMSE#PBF: pulling MODE high (>1.2V) enables automatic Burst Mode, reducing no-load IQ 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 is a deliberate system-level tradeoff - Burst Mode maximizes battery life in intermittently active devices, while forced continuous mode satisfies strict EMC or analog-signal integrity requirements.
Can the LTC3103IMSE#PBF start up into a pre-biased output voltage?
Yes, the LTC3103IMSE#PBF supports start-up into a pre-biased output. Its internal circuitry prevents reverse current flow during startup by controlling the synchronous rectifier turn-off timing, as verified in the "Start-Up into Pre-Biased Output" waveforms (Figures 3103 G14 and G15). This capability is essential in hot-swap or redundant power systems where the output capacitor may retain residual voltage before the converter is enabled.
What is the function of the BST pin on the LTC3103IMSE#PBF, and what capacitor value is required?
The BST pin on the LTC3103IMSE#PBF supplies the gate drive voltage for the internal high-side N-MOSFET switch. It is charged via an external bootstrap capacitor connected between BST and SW pins. The datasheet specifies a minimum value of 22nF ceramic capacitor, placed as close as possible to the IC. This capacitor must withstand voltage stress up to VIN + VSW swing and is critical for reliable high-side switching - undersizing causes gate underdrive and increased conduction losses.
Does the LTC3103IMSE#PBF include short-circuit protection, and how does it behave under hard output shorts?
Yes, the LTC3103IMSE#PBF includes short-circuit protection. When FB falls below 0.3V - indicating severe output overload or hard short - the switching frequency automatically reduces to ~300kHz to limit peak inductor current and prevent thermal runaway. This behavior is documented in the "Short-Circuit Protection" section and confirmed in the block diagram's "SD LOGIC" path. The device remains in current-limit mode until the fault clears or thermal shutdown activates.
LTC3103IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3103IMSE#PBF FAQ
1.How can I place an order for LTC3103IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3103IMSE#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 LTC3103IMSE#PBF reliable?
The price and inventory of LTC3103IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3103IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3103IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3103IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3103IMSE#PBF?
LTC3103IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3103IMSE#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 LTC3103IMSE#PBF?
For technical support, including LTC3103IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3103IMSE#PBF requirements.
6.How does Aetrix verify that LTC3103IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3103IMSE#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 LTC3103IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3103IMSE#PBF?
All LTC3103IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3103IMSE#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 LTC3103IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3103IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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