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Analog Devices Inc. LTC1503CMS8-1.8#TRPBF
- Part No.:
- LTC1503CMS8-1.8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1503CMS8-1.8#TRPBF.pdf
- Description:
- IC REG CHG PUMP 1.8V 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,657
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Product details
Overview
LTC1503CMS8-1.8#TRPBF from Analog Devices (formerly Linear Technology) is a switched-capacitor step-down DC/DC converter delivering a fixed 1.8V ±4% output from 2.4V–6V input, supporting up to 100mA load current with no inductor required. It operates at 600kHz, achieves typical efficiency 25% higher than LDOs, and features soft-start, shutdown disconnect, and full short-circuit/overtemperature protection - ideal for space-constrained Li-ion–powered handheld medical instruments.
For engineers reviewing the LTC1503CMS8-1.8#TRPBF datasheet, LTC1503CMS8-1.8#TRPBF pinout, LTC1503CMS8-1.8#TRPBF application, or LTC1503CMS8-1.8#TRPBF equivalent, key selection criteria include its inductorless architecture, 25µA no-load operating current, 5µA shutdown current, MSOP-8 package compatibility, and fixed 1.8V output regulation across industrial temperature range (–40°C to 85°C).
Technical Context
The LTC1503CMS8-1.8#TRPBF implements fractional switched-capacitor conversion using three dynamic modes: 2-to-1 (VIN > 3.6V), 3-to-2 (2.7V < VIN < 3.6V), and 1-to-1 gated-switch (VIN ≤ 2.7V), with internal mode-skipping logic triggered by VOUT droop to maintain regulation under varying load and input conditions. Its control loop senses output voltage via resistive divider feedback and enables charge-pump switching only as needed, enabling high light-load efficiency.
Regulation relies on dual comparators: COMP1 maintains nominal VOUT setpoint, while COMP2 (17mV hysteresis below regulation) forces mode transitions during heavy loads. The SHDN/SS pin integrates both shutdown control (0.2–0.5V threshold) and soft-start via external capacitor ramping of internal reference voltage, limiting inrush current without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8V ±4% (1.728V–1.872V); tightly regulated fixed output eliminates need for external feedback resistors. |
| Input Voltage Range | 2.4V to 6V; supports single-cell Li-ion (2.7–4.2V), 3-cell NiMH (3.6–4.5V), and USB-powered systems. |
| Max Output Current | 100mA continuous; sufficient for low-power DSP cores, smart card readers, and sensor interfaces. |
| Switching Frequency | 600kHz fixed; enables use of small 1µF ceramic flying capacitors and reduces EMI compared to lower-frequency charge pumps. |
| No-Load Operating Current | 25µA typical; extends battery life in always-on portable devices like handheld medical monitors. |
| Shutdown Current | 5µA typical; ensures minimal quiescent drain during system sleep states. |
| Output Ripple | 25mVP-P max (VIN = 3.6V, IOUT = 100mA, COUT = 10µF ceramic); manageable with standard bypassing. |
| Operating Temperature | –40°C to +85°C; qualified for industrial and portable medical equipment environments. |
Pinout & Package
Package: 8-pin MSOP (MS8), 3.0mm × 3.0mm × 0.85mm body, exposed pad not present, RoHS-compliant, tape-and-reel (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output | Delivers 1.8V ±4%; must be bypassed with ≥10µF low-ESR capacitor to ground for stability and ripple suppression. |
| C1– (Pin 2) | Flying capacitor negative terminal | Connects to negative plate of first 1µF external flying capacitor; part of charge-transfer network in all three conversion modes. |
| C1+ (Pin 3) | Flying capacitor positive terminal | Connects to positive plate of first 1µF external flying capacitor; forms half of dual-capacitor charge-pump topology. |
| VIN (Pin 4) | Input supply | Accepts 2.4V–6V; requires ≥10µF low-ESR bypass capacitor to minimize input ripple and source impedance. |
| SHDN/SS (Pin 5) | Shutdown/Soft-Start control | Drives shutdown when <0.35V; open-drain compatible; external capacitor sets VOUT ramp rate to limit inrush current. |
| C2+ (Pin 6) | Flying capacitor two positive terminal | Connects to positive plate of second 1µF external flying capacitor; essential for 3-to-2 mode operation. |
| GND (Pin 7) | Power ground | Primary return path; must connect to solid ground plane to ensure thermal performance and noise immunity. |
| C2– (Pin 8) | Flying capacitor two negative terminal | Connects to negative plate of second 1µF external flying capacitor; completes dual-capacitor charge-pump path. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless step-down conversion | Eliminates magnetic components, reducing BOM count, board area, and EMI concerns in compact portable designs. |
| Three-mode fractional charge pump | Automatically selects 2-to-1, 3-to-2, or 1-to-1 conversion to maximize efficiency across full VIN and load range. |
| Integrated soft-start | External capacitor on SHDN/SS pin controls VOUT ramp time (e.g., 4.7nF → ~4ms), limiting peak inrush to ~5mA with 10µF COUT. |
| Full protection suite | Short-circuit tolerant (indefinite VOUT-to-GND fault), overtemperature shutdown (150°C trip), and current-limited startup. |
| Ultra-low quiescent current | 25µA operating / 5µA shutdown enables multi-year battery life in maintenance-free IoT and medical sensors. |
Applications
| Smart Card Readers | Handheld Medical Instruments |
|---|---|
Use Scenario: Powering ISO 7816-compliant contact-based smart cards in portable point-of-care diagnostic devices. IC Role / Device Role / Timing Role: Provides stable 1.8V supply to card interface ICs during insertion, polling, and data exchange sequences. Use Value: Delivers regulated 1.8V from variable Li-ion battery (2.7–4.2V) without inductors, minimizing PCB footprint and EMI near sensitive analog front-ends. |
Use Scenario: Supplying low-noise 1.8V power to microcontroller peripherals and biosensor signal chains in handheld glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Acts as primary regulated rail for ADC reference, op-amp biasing, and MCU I/O domains requiring tight voltage tolerance. Use Value: Maintains 1.8V ±4% accuracy across –40°C to 85°C and battery discharge, ensuring consistent sensor calibration and measurement repeatability. |
| Low-Power DSP Supplies | Cellular Phone Subsystems |
Use Scenario: Powering standby-mode DSP cores and memory in always-listening voice-activated edge nodes. IC Role / Device Role / Timing Role: Supplies 1.8V to low-voltage DSP I/O and SRAM retention circuits during ultra-low-power sleep states. Use Value: Draws only 25µA quiescent current, extending battery runtime between wake cycles without compromising fast turn-on response. |
Use Scenario: Generating auxiliary 1.8V rails for camera modules, NFC controllers, or audio codecs in multi-rail smartphone architectures. IC Role / Device Role / Timing Role: Functions as secondary regulator stepping down main PMIC output (e.g., 3.3V) to 1.8V for digital subsystems. Use Value: Achieves 82.9% efficiency at 100mA (VIN = 3.6V), reducing thermal load and improving overall power budget versus LDO alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor step-down DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1503IS8-1.8 | Same electrical specs and pinout; packaged in 8-lead SO (S8) instead of MSOP-8; θJA = 150°C/W vs 200°C/W for MSOP. | Better thermal performance in high-ambient or high-power-density layouts; larger footprint (SO-8) may conflict with space-constrained designs. | Select LTC1503IS8-1.8 if board layout allows SO-8 and thermal margin is critical; otherwise LTC1503CMS8-1.8#TRPBF offers superior size efficiency. |
| LTC1754-1.8 | Fixed 1.8V SOT-23 charge pump; 50mA max output; 13µA IQ; no soft-start or mode-skipping; simpler 5-pin interface. | Targeted at ultra-low-current applications (<50mA); lacks dynamic mode optimization and robust protection features of LTC1503CMS8-1.8#TRPBF. | Choose LTC1754-1.8 only for cost-sensitive, low-IOUT designs where 100mA capability and advanced regulation are unnecessary. |
Compared with LTC1503IS8-1.8, the LTC1503CMS8-1.8#TRPBF saves 40% board area but trades 50°C/W higher thermal resistance; versus LTC1754-1.8, it doubles output current and adds soft-start/mode-skipping - critical for reliable 100mA delivery in battery-powered medical and communication systems.
Availability
LTC1503CMS8-1.8#TRPBF is available at Aetrix Electronics and suitable for handheld medical instruments, smart card readers, and low-power DSP supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1503CMS8-1.8#TRPBF 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 precision analog and power management portfolio with rigorous qualification standards and long-term product roadmaps.
The LTC1503 series was designed specifically for battery-powered portable electronics needing high-efficiency, inductorless voltage reduction - addressing size, cost, and EMI constraints unmet by traditional buck regulators or LDOs.
FAQ
What is the maximum continuous output current supported by the LTC1503CMS8-1.8#TRPBF?
The LTC1503CMS8-1.8#TRPBF delivers up to 100mA continuous output current while maintaining 1.8V ±4% regulation across its full input range (2.4V–6V) and operating temperature (–40°C to 85°C). This rating assumes proper thermal design with recommended 10µF input/output capacitors and adequate PCB copper area for heat dissipation in the MSOP-8 package.
Does the LTC1503CMS8-1.8#TRPBF require external inductors?
No, the LTC1503CMS8-1.8#TRPBF is an inductorless switched-capacitor DC/DC converter. It uses two external 1µF ceramic flying capacitors (C1+, C1–, C2+, C2–) and two 10µF bypass capacitors (CIN, COUT) - eliminating magnetic components, reducing EMI, and minimizing PCB area compared to inductive buck solutions.
How does the soft-start function work on the LTC1503CMS8-1.8#TRPBF?
The LTC1503CMS8-1.8#TRPBF implements soft-start via the SHDN/SS pin (Pin 5): connecting an external capacitor (e.g., 4.7nF) between SHDN/SS and GND causes the internal reference voltage to ramp linearly, controlling VOUT slew rate. This limits inrush current - for example, with 4.7nF and 10µF COUT, average inrush is ~5mA - preventing input rail collapse during power-up.
What protection features are integrated into the LTC1503CMS8-1.8#TRPBF?
The LTC1503CMS8-1.8#TRPBF includes short-circuit protection (indefinite VOUT-to-GND survival with 20mA current limit below 150mV), overtemperature shutdown (150°C trip, 125°C restart), and automatic mode-skipping to sustain regulation under overload. These features eliminate need for external current-sense or thermal monitoring circuitry in end equipment.
Can the LTC1503CMS8-1.8#TRPBF operate from a single-cell Li-ion battery?
Yes, the LTC1503CMS8-1.8#TRPBF operates across 2.4V–6V input, fully covering the discharge curve of a single-cell Li-ion battery (2.7V–4.2V). Its 2-to-1 and 3-to-2 fractional charge-pump modes maintain >80% efficiency across this range, making it ideal for Li-ion–powered handheld medical and communication devices.
LTC1503CMS8-1.8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC1503CMS8-1.8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1503CMS8-1.8#TRPBF 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#TRPBF reliable?
The price and inventory of LTC1503CMS8-1.8#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1503CMS8-1.8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1503CMS8-1.8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1503CMS8-1.8#TRPBF?
LTC1503CMS8-1.8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1503CMS8-1.8#TRPBF 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#TRPBF?
For technical support, including LTC1503CMS8-1.8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1503CMS8-1.8#TRPBF requirements.
6.How does Aetrix verify that LTC1503CMS8-1.8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1503CMS8-1.8#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1503CMS8-1.8#TRPBF?
All LTC1503CMS8-1.8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1503CMS8-1.8#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1503CMS8-1.8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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