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Analog Devices Inc. LTC1503IS8-1.8#TRPBF
- Part No.:
- LTC1503IS8-1.8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1503IS8-1.8#TRPBF.pdf
- Description:
- IC REG CHARG PUMP 1.8V 100MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,587
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Product details
Overview
LTC1503IS8-1.8#TRPBF 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, draws only 25µA quiescent current, and integrates soft-start and shutdown disconnect-ideal for space-constrained Li-ion–powered handheld medical instruments and smart card readers.
For engineers reviewing the LTC1503IS8-1.8#TRPBF datasheet, LTC1503IS8-1.8#TRPBF pinout, LTC1503IS8-1.8#TRPBF application, or LTC1503IS8-1.8#TRPBF equivalent, this page provides verified package mapping (SO-8), confirmed pin functions (e.g., SHDN/SS for controlled turn-on), efficiency vs. load curves, and two validated alternative parts with documented functional trade-offs.
Technical Context
The LTC1503IS8-1.8#TRPBF uses fractional charge-pump topology with automatic mode selection (2:1, 3:2, or 1:1) based on VIN/VOUT ratio and load, enabling >82% efficiency at 100mA with 3.6V input-25% higher than comparable LDOs. Regulation relies on output voltage sensing and dynamic switching network enablement, not feedback resistors.
It implements dual-protection architecture: short-circuit current limiting (8–50mA typical) and thermal shutdown at ~150°C, with indefinite short-circuit survival. Soft-start is externally programmable via capacitor on SHDN/SS (0.1–10nF), controlling VREF ramp rate and peak inrush current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8V ±4% (1.728V–1.872V); fixed internal reference eliminates external resistor network |
| Input Voltage Range | 2.4V to 6V; supports single-cell Li-ion (2.7–4.2V) and 3-cell NiMH (3.6–4.5V) without input pre-regulation |
| Max Output Current | 100mA continuous; sufficient for low-power DSP cores and microcontroller I/O rails |
| Switching Frequency | 600kHz fixed; enables use of small 1µF ceramic flying capacitors and reduces EMI filtering burden |
| Quiescent Current | 25µA at no load; extends battery life in always-on sensor nodes and standby peripherals |
| Shutdown Current | 5µA max; ensures minimal drain during system sleep modes |
| Output Ripple | 25mVP-P at 100mA/3.6V input with 10µF ceramic COUT; predictable low-frequency component aids filtering design |
Pinout & Package
Package: 8-lead plastic SO (narrow, 0.150-inch width), RoHS-compliant, rated for –40°C to +85°C industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output | Disconnected from VIN during shutdown; requires ≥10µF low-ESR bypass to ground for stability |
| C1– (Pin 2) | Flying capacitor negative terminal | Connects to negative plate of first external 1µF ceramic flying cap (C1) |
| C1+ (Pin 3) | Flying capacitor positive terminal | Connects to positive plate of first external 1µF ceramic flying cap (C1) |
| VIN (Pin 4) | Input supply | Accepts 2.4V–6V; bypassed with ≥10µF low-ESR capacitor to suppress input ripple |
| SHDN/SS (Pin 5) | Shutdown/Soft-start control | Open-drain compatible; <0.25V forces shutdown; capacitor to GND sets soft-start time (0.1–10nF → 0.1–8ms) |
| C2+ (Pin 6) | Flying capacitor positive terminal | Connects to positive plate of second external 1µF ceramic flying cap (C2) |
| GND (Pin 7) | Ground reference | Must connect to solid ground plane; critical for noise immunity and thermal performance |
| C2– (Pin 8) | Flying capacitor negative terminal | Connects to negative plate of second external 1µF ceramic flying cap (C2) |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and associated EMI; reduces BOM count to just four external capacitors |
| Auto-selecting conversion modes | Intelligently switches between 2:1, 3:2, and 1:1 charge-pump ratios to maintain >80% efficiency across full VIN and load range |
| Integrated soft-start | Externally adjustable via SHDN/SS capacitor; prevents inrush current spikes that could brown-out shared input rails |
| Robust protection suite | Indefinite short-circuit survival + overtemperature shutdown (150°C trip, 125°C recovery) ensure field reliability |
| Ultra-low quiescent power | 25µA operating / 5µA shutdown current enables multi-year battery life in portable diagnostics devices |
Applications
| Handheld Medical Instruments | Smart Card Readers |
|---|---|
Use Scenario: Powering low-noise analog front-ends and microcontrollers in portable blood glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Primary 1.8V rail generator for ADC reference and MCU core, replacing inefficient LDOs. Use Value: 25% higher efficiency vs. LDO extends single-CR2032 battery life by >30% under active measurement cycles. |
Use Scenario: Supplying secure element ICs and contact interface logic in ISO 7816-compliant payment terminals. IC Role / Device Role / Timing Role: Fixed 1.8V regulator for smart card VCC pin, meeting EMVCo transient response requirements. Use Value: Soft-start limits inrush to <5mA during card insertion, preventing reset glitches in host microcontroller. |
| Low-Power DSP Supplies | Cellular Phone Subsystems |
Use Scenario: Biasing audio codec and baseband DSP cores in feature phones and IoT voice modules. IC Role / Device Role / Timing Role: Dedicated 1.8V supply for digital signal processing blocks requiring clean, stable voltage. Use Value: 25mVP-P output ripple meets TI TAS57xx and ADI ADAU1701 PSRR requirements without additional LC filtering. |
Use Scenario: Powering camera module ISPs and RF transceiver bias rails in legacy GSM handsets. IC Role / Device Role / Timing Role: Secondary regulated rail derived from main Li-ion battery, supporting burst-mode operation. Use Value: 600kHz switching frequency avoids interference with 2G/3G RF bands; shutdown disconnect isolates subsystem during idle. |
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 |
|---|---|---|---|
| LTC1503CS8-1.8 | Same electrical specs; commercial-temp (0°C to 70°C) grade instead of industrial (–40°C to 85°C) | Not qualified for medical or automotive environments requiring extended temperature validation | Select when cost sensitivity outweighs need for full industrial temp range qualification |
| LTC1503CMS8-1.8 | Identical functionality in 8-lead MSOP package (3mm × 3mm); θJA = 200°C/W vs. SO-8's 150°C/W | Higher thermal resistance requires tighter layout control and lower ambient temps for 100mA operation | Choose for ultra-compact PCBs where SO-8 footprint is prohibitive, accepting derated thermal performance |
Compared with LTC1503CS8-1.8, the LTC1503IS8-1.8#TRPBF guarantees operation across –40°C to 85°C and is suitable for medical-grade designs; compared with LTC1503CMS8-1.8, it offers lower thermal resistance in the more manufacturable SO-8 package, easing thermal design for high-volume production.
Availability
LTC1503IS8-1.8#TRPBF is available at Aetrix Electronics and suitable for handheld medical instruments, smart card readers, and low-power DSP supplies requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC1503IS8-1.8#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 full product support, including datasheets, SPICE models, and application notes for legacy Linear parts.
The LTC1503 series was designed specifically for battery-powered portable electronics needing compact, efficient, inductorless voltage reduction-targeting applications where PCB area, EMI, and quiescent power are critical constraints.
FAQ
What is the maximum recommended output current for LTC1503IS8-1.8#TRPBF?
The LTC1503IS8-1.8#TRPBF is specified for continuous output current up to 100mA across the full industrial temperature range (–40°C to +85°C). At 100mA and 3.6V input, typical efficiency is 82.9%, and output voltage remains within ±4% (1.728V–1.872V). Sustained loads above 100mA may trigger thermal shutdown or cause output droop due to internal current limiting.
Does LTC1503IS8-1.8#TRPBF require external feedback resistors?
No, the LTC1503IS8-1.8#TRPBF does not require external feedback resistors. It features an internal fixed 1.8V reference and regulation circuitry. The output voltage is factory-trimmed to 1.8V ±4%, eliminating resistor placement, tolerance errors, and board space typically needed for adjustable regulators.
Can LTC1503IS8-1.8#TRPBF operate from a single alkaline cell?
No, LTC1503IS8-1.8#TRPBF cannot reliably operate from a single alkaline cell. Its minimum input voltage is 2.4V, while a fresh alkaline cell starts at ~1.6V and drops below 1.0V under load. It is designed for single Li-ion (2.7–4.2V), 3-cell NiMH (3.6–4.5V), or regulated 3.3V/5V supplies-not primary alkaline or zinc-carbon cells.
How is soft-start implemented on LTC1503IS8-1.8#TRPBF?
Soft-start on LTC1503IS8-1.8#TRPBF is implemented by connecting a capacitor (CSS) between the SHDN/SS pin (Pin 5) and ground. A 2µA internal pull-up current charges CSS, ramping the SHDN/SS voltage and synchronously ramping the internal reference voltage. A 4.7nF CSS yields ~4ms startup time and limits average inrush current to ~5mA with a 10µF COUT.
Is LTC1503IS8-1.8#TRPBF pin-compatible with LTC1503CS8-1.8?
Yes, LTC1503IS8-1.8#TRPBF is pin-compatible with LTC1503CS8-1.8. Both use identical 8-lead SO packages, share identical pinout (VOUT, C1–, C1+, VIN, SHDN/SS, C2+, GND, C2–), and have identical electrical specifications except for temperature grading: the 'I' suffix denotes industrial (–40°C to +85°C), while 'C' denotes commercial (0°C to +70°C).
LTC1503IS8-1.8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SO
LTC1503IS8-1.8#TRPBF FAQ
1.How can I place an order for LTC1503IS8-1.8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1503IS8-1.8#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 LTC1503IS8-1.8#TRPBF reliable?
The price and inventory of LTC1503IS8-1.8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1503IS8-1.8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1503IS8-1.8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1503IS8-1.8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1503IS8-1.8#TRPBF?
LTC1503IS8-1.8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1503IS8-1.8#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 LTC1503IS8-1.8#TRPBF?
For technical support, including LTC1503IS8-1.8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1503IS8-1.8#TRPBF requirements.
6.How does Aetrix verify that LTC1503IS8-1.8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1503IS8-1.8#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 LTC1503IS8-1.8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1503IS8-1.8#TRPBF?
All LTC1503IS8-1.8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1503IS8-1.8#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 LTC1503IS8-1.8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1503IS8-1.8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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