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Analog Devices Inc. LTC3103EMSE#PBF
- Part No.:
- LTC3103EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3103EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 300MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,180
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Product details
Overview
LTC3103EMSE#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter delivering up to 300mA output current with 1.8µA quiescent current in Burst Mode, 2.5V–15V input range, and adjustable 0.6V–13.8V output voltage. It operates in either automatic Burst Mode for ultralow power or forced continuous 1.2MHz PWM mode for low-noise regulation-ideal for energy-harvesting nodes and remote sensor systems.
For engineers reviewing the LTC3103EMSE#PBF datasheet, LTC3103EMSE#PBF pinout, LTC3103EMSE#PBF application, or LTC3103EMSE#PBF equivalent, key selection considerations include its 10-pin MSOP package thermal performance (θJA = 40°C/W), accurate RUN pin threshold (0.80V typ), PGOOD status signaling, internal soft-start (1.4ms typ), and dual-mode operation trade-offs between light-load efficiency and output ripple/noise.
Technical Context
The LTC3103EMSE#PBF uses a current-mode control architecture with integrated N-channel main switch (RDS(ON) = 0.65Ω) and synchronous rectifier (RDS(ON) = 0.85Ω), enabling high efficiency across wide duty cycles (up to 92%). Its internal slope compensation ensures stable operation at >40% duty cycle without external components.
Burst Mode entry/exit is dynamically determined by peak inductor current, while forced continuous mode maintains fixed 1.2MHz switching with no pulse skipping. The device integrates thermal shutdown (150°C trip), UVLO (2.1V rising threshold), and a programmable RUN comparator with 60mV hysteresis for precise enable control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 15V - supports multicell Li-ion, supercapacitor, and industrial supply rails without external pre-regulation. |
| Output Current | 300mA max - sufficient for microcontrollers, RF transceivers, and low-power sensors in compact systems. |
| Quiescent Current | 1.8µA in Burst Mode - enables multi-year battery life in intermittently active IoT endpoints. |
| Switching Frequency | 1.2MHz fixed in forced continuous mode - allows use of small, low-profile inductors (e.g., 10µH) and reduces EMI filtering burden. |
| Feedback Reference | 0.600V ±2% - enables precise output voltage setting down to 0.6V with standard resistor dividers. |
| Power Good Threshold | –10% VFB (typ) - provides reliable system-level power sequencing and fault detection for downstream logic. |
| Thermal Shutdown | 150°C (typ), recovery at ~130°C - protects against sustained overload or poor PCB heatsinking without latch-up. |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm × 1.1mm), exposed pad (Pin 11) tied to GND for thermal management (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Main power input | 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 - critical for layout to minimize loop area and parasitic inductance. |
| BST (3) | Bootstrap supply | Drives high-side gate via 22nF capacitor to SW; must be placed within 2mm of IC for reliable start-up and regulation. |
| GND (4) | Power ground | Primary return path for power switches; connects to exposed pad for optimal thermal conduction. |
| PGOOD (5) | Open-drain status output | Pulls low if VOUT drops >10% below regulation, during thermal shutdown, or UVLO - requires external pull-up to ≤6V. |
| VCC (6) | Internal bias rail | Regulated ~3.3V supply for control circuitry; decoupled with ≥1µF ceramic cap close to pin. |
| RUN (7) | Enable comparator input | Active-high enable with 0.80V threshold and 60mV hysteresis - configurable as precision UVLO using external resistor divider. |
| FB (8) | Error amplifier input | Senses resistive divider from VOUT; sets output voltage as VOUT = 0.6V × (1 + R1/R2); input bias <20nA enables high-impedance dividers. |
| NC (9) | No-connect | Must be tied to GND per datasheet - floating connection may cause instability or EMI susceptibility. |
| MODE (10) | Operation mode select | High (>1.2V) enables Burst Mode; low (<0.5V) forces continuous 1.2MHz PWM - direct logic-level control without pull-ups. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 1.8µA in Burst Mode - extends battery life in always-on, low-duty-cycle applications such as environmental sensors. |
| Synchronous rectification | Integrated N-MOSFETs (0.65Ω/0.85Ω) - eliminates external Schottky loss, enabling >95% peak efficiency without heat sink. |
| User-selectable operating mode | Hardware-configurable MODE pin - eliminates firmware dependency for optimizing noise vs. efficiency in final design. |
| Accurate power-good signaling | PGOOD with 1ms delay and 2% hysteresis - enables robust system reset and sequencing without external monitoring ICs. |
| Internal soft-start | 1.4ms typical duration - prevents inrush current and output overshoot during cold start or wake-up events. |
Applications
| Remote Sensor Networks | Distributed Power Systems |
|---|---|
Use Scenario: Wireless temperature/humidity nodes powered by coin-cell or energy harvesters, transmitting data every 5–60 minutes. IC Role / Device Role / Timing Role: Primary voltage regulator converting harvested microwatts or battery voltage to stable 3.3V for MCU and radio. Use Value: 1.8µA quiescent current minimizes standby drain, enabling >10-year battery life; Burst Mode ensures rapid wake-up response without sacrificing efficiency. | Use Scenario: Industrial field devices with distributed 12V or 24V rails powering multiple low-voltage subsystems (e.g., analog front-ends, digital isolators). IC Role / Device Role / Timing Role: Local point-of-load regulator providing clean, regulated 1.8V/2.5V/3.3V from intermediate bus. Use Value: 1.2MHz fixed-frequency operation simplifies EMI filtering; PGOOD enables coordinated power-up sequencing across modules. |
| Multicell Battery or SuperCap Regulator | Energy Harvesters |
Use Scenario: Portable medical monitors using 3×AA alkaline or Li-SOCl₂ primary cells, requiring stable 3.0V output over full discharge curve (3.0V–4.5V input). IC Role / Device Role / Timing Role: Efficient buck converter maintaining constant output despite falling input voltage and variable load. Use Value: Wide 2.5V–15V input range accommodates full battery stack voltage swing; 95% peak efficiency preserves usable capacity. | Use Scenario: Solar-powered soil moisture sensors harvesting µW–mW under indoor lighting or partial sun, storing energy in supercapacitors. IC Role / Device Role / Timing Role: Low-input-voltage regulator stepping down supercap voltage (1.5V–5.5V) to 2.2V for ultra-low-power MCU. Use Value: 2.5V minimum input enables operation down to near-dead supercap; internal soft-start prevents startup failure into pre-biased output. |
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 6-pin WSON package, but 2A max output and higher minimum input (1.8V) | Better for sub-µA always-on systems; less suitable for 15V input or 300mA+ loads | Select when lowest possible quiescent current dominates; verify 15V input compatibility with external clamping. |
| MAX17552ATC+ | Higher current (400mA), wider temp range (–40°C to +125°C), but 12µA IQ and no Burst Mode | Preferred for industrial environments requiring extended temperature operation and higher load margin | Choose when thermal robustness and load headroom outweigh ultralow-IQ needs; accept higher light-load power loss. |
Compared with TPS62840DLCR and MAX17552ATC+, the LTC3103EMSE#PBF uniquely balances 1.8µA quiescent current, 15V input capability, and hardware-selectable modes in a thermally enhanced MSOP - making it optimal for battery-supplied remote sensors where input voltage range and mode flexibility are critical.
Availability
LTC3103EMSE#PBF is available at Aetrix Electronics and suitable for remote sensor networks, energy harvesting systems, and distributed power supplies requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3103EMSE#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 continues its legacy of high-performance analog and power management ICs, emphasizing precision, efficiency, and reliability for demanding applications.
The LTC3103 belongs to Linear's ultralow-quiescent-current DC/DC converter product line, designed specifically for energy-constrained systems including wireless sensor nodes, portable instrumentation, and battery-backed industrial controls.
FAQ
What is the maximum input voltage rating for the LTC3103EMSE#PBF?
The LTC3103EMSE#PBF has an absolute maximum input voltage rating of 18V, with recommended operating range of 2.5V to 15V. Exceeding 18V risks permanent damage. The device includes internal undervoltage lockout (UVLO) that disables operation below 2.1V (typical) to prevent erratic behavior during brownout conditions. For designs approaching 15V, ensure proper PCB layout and input capacitance to limit transient overshoot.
How does the MODE pin affect the operation of the LTC3103EMSE#PBF?
The MODE pin on the LTC3103EMSE#PBF selects between two distinct operating modes: applying >1.2V enables automatic Burst Mode for ultralow 1.8µA quiescent current at light loads, while applying <0.5V forces continuous 1.2MHz PWM operation for minimal output ripple and noise. The pin accepts direct logic-level control without pull-up resistors, and its 0.8V threshold hysteresis prevents oscillation near the transition point. This hardware-selectable feature avoids firmware dependencies in safety-critical or resource-limited systems.
Can the LTC3103EMSE#PBF start up into a pre-biased output?
Yes, the LTC3103EMSE#PBF supports start-up into a pre-biased output, as confirmed by typical performance curves (Figure 3103 G14–G16). Its internal BST charge pump and comparator monitor boot capacitor voltage to ensure reliable high-side gate drive even when VOUT is initially non-zero. During pre-biased start-up, the device enters soft-start with controlled current ramp, avoiding reverse current flow or output collapse. This capability is essential for hot-swap and redundant power applications.
What thermal performance can be expected from the LTC3103EMSE#PBF in its MSOP package?
The LTC3103EMSE#PBF in the 10-lead MSOP package has a junction-to-ambient thermal resistance (θJA) of 40°C/W under standard JEDEC 2-layer board conditions. With its exposed pad soldered to a 1-in² copper pour, it can sustain 300mA output continuously at ambient temperatures up to ~85°C (assuming 15V input and 3.3V output). Thermal shutdown activates at ~150°C (typical), and recovery occurs at ~130°C. For high-temperature environments, derating or additional copper area is recommended.
Is the PGOOD output of the LTC3103EMSE#PBF compatible with standard logic voltage levels?
The PGOOD output of the LTC3103EMSE#PBF is an open-drain NMOS device rated for ≤6V pull-up voltage, making it compatible with 1.8V, 3.3V, and 5V logic families when paired with an appropriate external pull-up resistor. It asserts low when VFB falls >10% below 0.6V (i.e., VOUT < 0.54V), during thermal shutdown, or UVLO. The output remains valid 1ms after enable and includes built-in deglitching to reject transient load-induced dips. Do not connect PGOOD directly to supplies >6V to avoid exceeding absolute maximum ratings.
LTC3103EMSE#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
LTC3103EMSE#PBF FAQ
1.How can I place an order for LTC3103EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3103EMSE#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 LTC3103EMSE#PBF reliable?
The price and inventory of LTC3103EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3103EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3103EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3103EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3103EMSE#PBF?
LTC3103EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3103EMSE#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 LTC3103EMSE#PBF?
For technical support, including LTC3103EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3103EMSE#PBF requirements.
6.How does Aetrix verify that LTC3103EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3103EMSE#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 LTC3103EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3103EMSE#PBF?
All LTC3103EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3103EMSE#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 LTC3103EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3103EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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