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Analog Devices Inc. LTC1503CS8-1.8#PBF
- Part No.:
- LTC1503CS8-1.8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1503CS8-1.8#PBF.pdf
- Description:
- IC REG CHARG PUMP 1.8V 100MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,284
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Product details
Overview
LTC1503CS8-1.8#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 input/100mA load, and features soft-start, shutdown disconnect, and short-circuit protection. It is used in space-constrained battery-powered systems such as handheld medical instruments and smart card readers.
For engineers reviewing the LTC1503CS8-1.8#PBF datasheet, LTC1503CS8-1.8#PBF pinout, LTC1503CS8-1.8#PBF application, or LTC1503CS8-1.8#PBF equivalent, key selection criteria include its no-inductor architecture, 25µA no-load operating current, 5µA shutdown current, 25mVP-P output ripple with 10µF ceramic output capacitor, and compatibility with single-cell Li-ion or triple-cell NiMH inputs.
Technical Context
The LTC1503CS8-1.8#PBF implements fractional switched-capacitor conversion using three selectable modes-2-to-1, 3-to-2, and 1-to-1-to dynamically optimize efficiency across varying input voltage (2.4V–6V) and load (0–100mA) conditions. Internal comparators monitor VOUT and trigger mode skipping when regulation is compromised under heavy load.
Regulation is achieved via output voltage sensing and charge-pump enable control, enabling high efficiency even at light loads. The SHDN/SS pin integrates both shutdown control (threshold: 0.2–0.5V) and user-configurable soft-start via external capacitor, limiting inrush current by ramping the internal reference voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8V ±4% (1.728V–1.872V), fixed and factory-trimmed for stable low-voltage rail generation |
| Input Voltage Range | 2.4V to 6V - supports single Li-ion (2.7–4.2V) and triple NiMH (3.6–4.5V) batteries without external regulators |
| Max Output Current | 100mA - sufficient for low-power microcontrollers, sensors, and interface ICs in portable devices |
| Switching Frequency | 600kHz - enables use of small 1µF flying capacitors and minimizes EMI compared to lower-frequency charge pumps |
| No-Load Operating Current | 25µA (typ) - extends battery life in always-on or duty-cycled applications like smart cards |
| Shutdown Current | 5µA (typ) - ensures minimal drain during system sleep, critical for multi-year battery operation |
| Output Ripple | 25mVP-P (VIN = 3.6V, IOUT = 100mA, COUT = 10µF ceramic) - meets noise requirements for analog and mixed-signal circuits |
| Efficiency | 82.9% (VIN = 3.6V, IOUT = 100mA) - 25% higher than comparable LDOs, reducing thermal load and extending runtime |
Pinout & Package
Package: 8-pin SO (Small Outline, narrow 0.150", JEDEC MS-012). RoHS-compliant, lead-free, surface-mountable with standard reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output voltage node | Delivers 1.8V ±4%; must be bypassed with ≥10µF low-ESR capacitor to ground for stability and ripple suppression |
| C1– (Pin 2) | Flying capacitor C1 negative terminal | Connects to negative plate of first external 1µF flying capacitor; forms part of charge-transfer network |
| C1+ (Pin 3) | Flying capacitor C1 positive terminal | Connects to positive plate of first external 1µF flying capacitor; switches between VIN and VOUT during 2-to-1 mode |
| VIN (Pin 4) | Main power input | Accepts 2.4V–6V; requires ≥10µF low-ESR bypass capacitor to ground near pin for transient response and noise immunity |
| SHDN/SS (Pin 5) | Shutdown and soft-start control | Drives shutdown below 0.25V; open-drain compatible; external capacitor sets VOUT ramp rate and controls inrush current |
| C2+ (Pin 6) | Flying capacitor C2 positive terminal | Connects to positive plate of second external 1µF flying capacitor; active in 3-to-2 mode for higher current capability |
| GND (Pin 7) | Analog and power ground reference | Must connect to low-impedance ground plane; all bypass caps tie here to minimize noise coupling and improve regulation |
| C2– (Pin 8) | Flying capacitor C2 negative terminal | Connects to negative plate of second external 1µF flying capacitor; completes dual-capacitor charge-pump topology |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components, reducing board area, cost, and EMI - ideal for ultra-thin handhelds and wearables |
| Three-mode fractional conversion | Automatically selects 2-to-1, 3-to-2, or 1-to-1 switching ratio based on VIN/VOUT ratio and load, maximizing efficiency across full operating range |
| Integrated soft-start | External capacitor on SHDN/SS pin linearly ramps VOUT reference, limiting inrush current to predictable levels (e.g., ~5mA with 4.7nF/10µF) |
| Robust protection suite | Indefinite short-circuit tolerance on VOUT and thermal shutdown at ~150°C ensure field reliability without external circuitry |
| Ultra-low quiescent current | 25µA operating / 5µA shutdown enables >1-year battery life in intermittent-use devices like glucose meters and RFID readers |
Applications
| Handheld Medical Instruments | Smart Card Readers |
|---|---|
|
Use Scenario: Portable blood glucose meters powered by coin-cell or single Li-ion battery requiring regulated 1.8V for MCU and sensor interface. IC Role / Device Role / Timing Role: Primary step-down regulator generating clean 1.8V rail from variable battery voltage; replaces inefficient LDO to extend battery life. Use Value: 82.9% efficiency at 100mA and 25µA no-load current directly increase usable battery capacity by >25% versus LDO alternatives. |
Use Scenario: Contactless smart card reader in access control terminals, operating from 3.3V or 5V supply with need for isolated 1.8V logic rail. IC Role / Device Role / Timing Role: Standalone voltage translator providing isolated, low-noise 1.8V for ISO/IEC 14443-A/B transceivers and secure elements. Use Value: No-inductor design avoids magnetic interference with RF front-end; 25mVP-P ripple ensures reliable digital communication without bit errors. |
| Low-Power DSP Supplies | Cellular Phone Subsystems |
|
Use Scenario: Powering ultra-low-power DSP cores in voice-recognition edge nodes where thermal headroom and PCB area are constrained. IC Role / Device Role / Timing Role: Dedicated supply for DSP I/O and memory interface, decoupled from main SoC rail to reduce noise coupling. Use Value: Soft-start prevents supply droop during wake-up, ensuring deterministic boot timing; shutdown mode cuts leakage to 5µA during idle cycles. |
Use Scenario: Backlight driver or camera module auxiliary supply in legacy GSM handsets using NiMH battery packs. IC Role / Device Role / Timing Role: Secondary regulator converting 4.2V battery output to precise 1.8V for CMOS image sensor bias and interface logic. Use Value: 600kHz switching frequency allows compact 1µF flying caps; 8-pin SO package fits tight layouts near camera flex connectors. |
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 |
|---|---|---|---|
| LTC1503CMS8-1.8#PBF | Same electrical specs, but in 8-pin MSOP (3mm × 3mm) instead of SO (4.9mm × 3.9mm); θJA = 200°C/W vs 150°C/W | Better suited for ultra-dense layouts where board area is more critical than thermal margin | Select when footprint reduction outweighs thermal derating needs; requires MSOP-specific layout and reflow profile |
| LTC1754-1.8 | Fixed 1.8V SOT-23 charge pump (50mA max, 13µA IQ); no soft-start, no mode skipping, lower current capability | Targeted at simpler, lower-cost applications with <50mA loads and no inrush sensitivity | Choose only for cost-sensitive, low-current roles where soft-start and 100mA capability are unnecessary |
Compared with LTC1503CMS8-1.8#PBF, the LTC1503CS8-1.8#PBF offers better thermal performance in larger SO packages but occupies more PCB area; versus LTC1754-1.8, it delivers 2× output current, integrated soft-start, and adaptive mode control - essential for robust battery-powered designs.
Availability
LTC1503CS8-1.8#PBF 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 LTC1503CS8-1.8#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 its precision analog and power management portfolio with rigorous testing and long-term product commitments.
The LTC1503 series belongs to Linear's legacy high-efficiency charge pump DC/DC converter family, designed specifically for battery-powered portable electronics needing compact, inductorless, low-quiescent-power voltage regulation.
FAQ
What is the maximum continuous output current of the LTC1503CS8-1.8#PBF?
The LTC1503CS8-1.8#PBF delivers up to 100mA continuously under specified conditions (TA = 25°C, VIN = 3.6V, COUT = 10µF). At higher ambient temperatures or with reduced input voltage, derating applies - e.g., ~85mA at 85°C ambient due to thermal limits. Short-circuit current is internally limited to 8–50mA depending on VIN.
Does the LTC1503CS8-1.8#PBF require external inductors?
No, the LTC1503CS8-1.8#PBF is an inductorless switched-capacitor DC/DC converter. It uses two external 1µF flying capacitors (C1, C2) and two 10µF bypass capacitors (CIN, COUT) - eliminating magnetic components, size constraints, and EMI concerns associated with inductive buck regulators.
How does the soft-start function work on the LTC1503CS8-1.8#PBF?
The SHDN/SS pin on the LTC1503CS8-1.8#PBF serves dual purpose: applying <0.25V forces shutdown, while connecting an external capacitor (e.g., 4.7nF) between SHDN/SS and GND enables soft-start. An internal 2µA pull-up charges this capacitor, ramping the internal reference voltage and thus controlling VOUT slew rate to limit inrush current.
What protection features are built into the LTC1503CS8-1.8#PBF?
The LTC1503CS8-1.8#PBF includes short-circuit protection (limits VOUT current to 20mA typ when VOUT < 150mV), overtemperature shutdown (~150°C trip, ~125°C recovery), and automatic mode skipping to maintain regulation under dynamic load. It tolerates indefinite VOUT-to-GND shorts without damage.
Can the LTC1503CS8-1.8#PBF operate from a single-cell Li-ion battery?
Yes - the LTC1503CS8-1.8#PBF supports input voltages from 2.4V to 6V, fully covering the discharge curve of a single-cell Li-ion battery (2.7V–4.2V). Its 2-to-1 and 3-to-2 modes maintain >80% efficiency across this range, making it ideal for direct battery connection without pre-regulation.
LTC1503CS8-1.8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SO
LTC1503CS8-1.8#PBF FAQ
1.How can I place an order for LTC1503CS8-1.8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1503CS8-1.8#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 LTC1503CS8-1.8#PBF reliable?
The price and inventory of LTC1503CS8-1.8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1503CS8-1.8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1503CS8-1.8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1503CS8-1.8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1503CS8-1.8#PBF?
LTC1503CS8-1.8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1503CS8-1.8#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 LTC1503CS8-1.8#PBF?
For technical support, including LTC1503CS8-1.8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1503CS8-1.8#PBF requirements.
6.How does Aetrix verify that LTC1503CS8-1.8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1503CS8-1.8#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 LTC1503CS8-1.8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1503CS8-1.8#PBF?
All LTC1503CS8-1.8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1503CS8-1.8#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 LTC1503CS8-1.8#PBF part is unused and in its original packaging.
Return procedure for LTC1503CS8-1.8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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