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Analog Devices Inc. LTC1503CMS8-1.8#PBF
- Part No.:
- LTC1503CMS8-1.8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1503CMS8-1.8#PBF.pdf
- Description:
- IC REG CHG PUMP 1.8V 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:296
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Product details
Overview
LTC1503CMS8-1.8#PBF from Analog Devices (formerly Linear Technology) is a fixed-output, inductorless switched-capacitor step-down DC/DC converter delivering 1.8V ±4% at up to 100mA from a 2.4V–6V input. It operates at 600kHz, achieves 82.9% efficiency at 3.6V/100mA, and features soft-start, shutdown disconnect, and short-circuit protection. It targets space-constrained battery-powered systems such as handheld medical instruments and smart card readers.
For engineers reviewing the LTC1503CMS8-1.8#PBF datasheet, LTC1503CMS8-1.8#PBF pinout, LTC1503CMS8-1.8#PBF application, or LTC1503CMS8-1.8#PBF equivalent, key selection considerations include its no-inductor architecture, 25µA no-load operating current, MSOP-8 package footprint, and compatibility with single-cell Li-ion or triple-cell NiMH inputs.
Technical Context
The LTC1503CMS8-1.8#PBF implements fractional charge-pump conversion using three selectable modes-2-to-1, 3-to-2, and 1-to-1-to optimize efficiency across varying input voltage and load conditions. Internal comparators dynamically select mode based on VIN/VOUT ratio and output droop detection.
Regulation is achieved via output voltage sensing and adaptive switching network enablement, enabling high efficiency even at light loads (e.g., 1mA). The SHDN/SS pin integrates both shutdown control (threshold: 0.2–0.5V) and soft-start via external capacitor ramping of the internal reference voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8V ±4% (1.728V–1.872V); tightly regulated for low-voltage logic rails |
| Input Voltage Range | 2.4V to 6V; supports single Li-ion (2.7–4.2V), 3-cell NiMH (3.6–4.5V), or USB-powered systems |
| Max Output Current | 100mA; sufficient for low-power microcontrollers, sensors, and interface ICs |
| Switching Frequency | 600kHz; enables use of small 1µF flying capacitors and minimizes EMI filtering burden |
| No-Load Operating Current | 25µA (typ); extends battery life in standby or intermittent-use applications |
| Shutdown Current | 5µA (typ); ensures minimal drain during system sleep states |
| Output Ripple | 25mVP-P (at 3.6V/100mA, 10µF ceramic COUT); manageable with standard bypassing |
| Efficiency | 82.9% (at 3.6V input, 100mA load); ~25% higher than comparable LDOs under same conditions |
Pinout & Package
Package: 8-pin MSOP (MS8), 3.0mm × 3.0mm body, 0.65mm pitch, exposed pad optional (not electrically connected per datasheet).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output voltage node | Delivers 1.8V; disconnected from VIN during shutdown; requires ≥10µF low-ESR ceramic/tantalum bypass |
| C1– (Pin 2) | Flying capacitor C1 negative terminal | Connects to negative lead of first external 1µF flying capacitor; part of charge-transfer path |
| C1+ (Pin 3) | Flying capacitor C1 positive terminal | Connects to positive lead of first external 1µF flying capacitor; used in all three conversion modes |
| VIN (Pin 4) | Main input supply | Accepts 2.4V–6V; requires ≥10µF low-ESR input bypass capacitor near pin |
| SHDN/SS (Pin 5) | Shutdown and soft-start control | Open-drain compatible; <0.25V = shutdown; external capacitor sets VOUT ramp rate and inrush current limit |
| C2+ (Pin 6) | Flying capacitor C2 positive terminal | Connects to positive lead of second external 1µF flying capacitor; essential for 3-to-2 mode operation |
| GND (Pin 7) | Analog/digital ground reference | Must connect to low-impedance ground plane; critical for ripple suppression and thermal performance |
| C2– (Pin 8) | Flying capacitor C2 negative terminal | Connects to negative lead of second external 1µF flying capacitor; completes dual-capacitor topology |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components, reducing BOM cost, board area, and EMI concerns in portable designs |
| Adaptive 2-to-1 / 3-to-2 / 1-to-1 mode selection | Maintains >80% efficiency across full VIN range (2.4V–6V) and load (1mA–100mA) without manual configuration |
| Integrated soft-start | External capacitor on SHDN/SS pin controls VOUT ramp time (e.g., 4.7nF → ~4ms), limiting inrush to ~5mA with 10µF COUT |
| Full protection suite | Indefinite short-circuit survival, overtemperature shutdown (150°C trip), and automatic recovery (125°C hysteresis) |
| Ultra-low quiescent current | 25µA operating / 5µA shutdown enables multi-year battery life in IoT and wearable devices |
| Industrial temperature rating | Specified from –40°C to +85°C; suitable for medical, industrial, and automotive cabin applications |
Applications
| Handheld Medical Instruments | Smart Card Readers |
|---|---|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by coin-cell or single Li-ion batteries requiring stable 1.8V for MCU and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator converting variable battery voltage to precise 1.8V rail for low-power ARM Cortex-M0+ and analog front-end ICs. Use Value: Eliminates inductor size penalty while sustaining >80% efficiency down to 1mA load, extending battery runtime between calibrations. | Use Scenario: Contact/contactless smart card readers in point-of-sale terminals where PCB space is constrained and EMI must be minimized. IC Role / Device Role / Timing Role: Supplies regulated 1.8V to ISO/IEC 7816-3 compliant smart card interface ICs and secure elements. Use Value: No-inductor design avoids magnetic coupling into card antenna circuits; 25µA quiescent current meets EN 14971 low-power standby requirements. |
| Low-Power DSP Supplies | Cellular Phone Peripherals |
Use Scenario: Powering ultra-low-power DSPs (e.g., TI TMS320C55xx derivatives) in battery-operated audio analyzers or voice recorders. IC Role / Device Role / Timing Role: Provides clean, ripple-controlled 1.8V core supply synchronized to DSP clock domain via stable regulation loop. Use Value: 25mVP-P output ripple at 100mA meets typical DSP core noise floor specs; soft-start prevents supply sag during wake-from-sleep transitions. | Use Scenario: Secondary power rail for camera modules, Bluetooth radios, or display drivers in legacy GSM/EDGE handsets with limited board real estate. IC Role / Device Role / Timing Role: Generates 1.8V from main 3.6V Li-ion rail for I²C peripherals and low-voltage logic interfaces. Use Value: MSOP-8 footprint matches legacy SO-8 layouts; 600kHz switching allows compact 1µF flying caps, freeing space for RF shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1503CMS8-2 | Fixed 2.0V output (±4%), identical pinout, package, and electrical specs otherwise | Used where 2.0V logic or specific sensor biasing is required instead of 1.8V | Select when system-level voltage tolerance permits 2.0V; shares same layout and bill-of-materials except output cap value |
| LTC1754ES5-1.8#TRMPBF | SOT-23-5 package, 50mA max output, 13µA quiescent current, no soft-start, fixed 1.8V | Targeted at ultra-small footprints and lower-current applications (<50mA) | Choose for space-critical designs with ≤50mA load; trade-off is reduced current capability and missing soft-start/shutdown disconnect |
Compared with LTC1503CMS8-1.8#PBF, LTC1503CMS8-2 offers identical performance at 2.0V for systems needing higher logic margin, while LTC1754ES5-1.8#TRMPBF provides a smaller SOT-23 footprint at half the output current and without soft-start-making it suitable only for simpler, lower-power implementations.
Availability
LTC1503CMS8-1.8#PBF is available at Aetrix Electronics and suitable for handheld medical instruments, smart card readers, low-power DSP supplies, and cellular phone peripherals requiring stable component supply, long-term manufacturability, and industrial-temperature-grade reliability.
Supply support for LTC1503CMS8-1.8#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 legacy Linear parts.
The LTC1503 series belongs to Linear's precision switched-capacitor DC/DC converter product line, designed specifically for battery-powered portable electronics where inductor elimination, ultra-low quiescent current, and robust protection are mandatory.
FAQ
What is the maximum input voltage the LTC1503CMS8-1.8#PBF can handle?
The LTC1503CMS8-1.8#PBF supports an absolute maximum input voltage of 6.5V across VIN, C1+, C1−, C2+, and C2− pins relative to GND. Its specified operating range is 2.4V to 6V. Exceeding 6V risks permanent damage, and operation above 6.5V violates absolute maximum ratings per the datasheet. For reliable long-term use, keep VIN ≤6V with appropriate input filtering.
Does the LTC1503CMS8-1.8#PBF require external compensation components?
No, the LTC1503CMS8-1.8#PBF does not require external compensation components. Its regulation loop is fully internal and factory-trimmed. Stability is ensured across all operating conditions using only the specified external components: two 1µF flying capacitors (C1, C2), one 10µF input bypass capacitor (CIN), and one 10µF output capacitor (COUT). Adding extra RC networks or feedback dividers will disrupt regulation.
Can the LTC1503CMS8-1.8#PBF drive a 100mA load continuously at 85°C ambient?
Yes, the LTC1503CMS8-1.8#PBF is rated for continuous 100mA output across the full industrial temperature range (–40°C to +85°C), provided thermal design guidelines are followed. With the MSOP-8 package (θJA = 150°C/W), maintaining a PCB copper area ≥1 cm² connected to Pin 7 (GND) and minimizing ambient airflow resistance ensures junction temperature stays below 125°C under worst-case 6V/100mA conditions.
Is the LTC1503CMS8-1.8#PBF RoHS-compliant and lead-free?
Yes, the LTC1503CMS8-1.8#PBF is RoHS-compliant and lead-free. The "#PBF" suffix explicitly denotes lead-free (Pb-free) packaging per Analog Devices' product marking convention. It meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is compatible with standard SnPb and lead-free reflow profiles.
How does the LTC1503CMS8-1.8#PBF behave during output short-circuit events?
During a sustained VOUT-to-GND short, the LTC1503CMS8-1.8#PBF limits output current to 8–50mA (typical 22mA) and remains functional indefinitely without latch-off or damage. Once the short is removed, it automatically recovers normal regulation within milliseconds. This behavior is enabled by internal current limiting and thermal foldback-no external circuitry is needed for short-circuit survivability.
LTC1503CMS8-1.8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.4V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1503CMS8-1.8#PBF FAQ
1.How can I place an order for LTC1503CMS8-1.8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1503CMS8-1.8#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 LTC1503CMS8-1.8#PBF reliable?
The price and inventory of LTC1503CMS8-1.8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1503CMS8-1.8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1503CMS8-1.8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1503CMS8-1.8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1503CMS8-1.8#PBF?
LTC1503CMS8-1.8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1503CMS8-1.8#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 LTC1503CMS8-1.8#PBF?
For technical support, including LTC1503CMS8-1.8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1503CMS8-1.8#PBF requirements.
6.How does Aetrix verify that LTC1503CMS8-1.8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1503CMS8-1.8#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 LTC1503CMS8-1.8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1503CMS8-1.8#PBF?
All LTC1503CMS8-1.8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1503CMS8-1.8#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 LTC1503CMS8-1.8#PBF part is unused and in its original packaging.
Return procedure for LTC1503CMS8-1.8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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