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Analog Devices Inc. LTC1503IS8-2#TRPBF
- Part No.:
- LTC1503IS8-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1503IS8-2#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 2V 100MA 8SO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC1503IS8-2#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 2V output, inductorless switched-capacitor step-down DC/DC converter optimized for space-constrained battery-powered systems. It operates from 2.4V to 6V input, delivers up to 100mA output current, achieves 82.9% efficiency at 3.6V/100mA, and features 600kHz switching frequency with integrated soft-start and shutdown disconnect. It is used in handheld medical instruments requiring stable low-noise 2V supply from single Li-ion cells.
For engineers reviewing the LTC1503IS8-2#TRPBF datasheet, LTC1503IS8-2#TRPBF pinout, LTC1503IS8-2#TRPBF application, or LTC1503IS8-2#TRPBF equivalent, key selection criteria include its no-inductor architecture, 25µA quiescent current, industrial temperature range (–40°C to 85°C), SO-8 package compatibility, and mode-switching charge-pump regulation supporting 2-to-1, 3-to-2, and 1-to-1 conversion ratios.
Technical Context
The LTC1503IS8-2#TRPBF implements fractional switched-capacitor voltage conversion using three dynamically selected modes: 2-to-1 (VIN > 4V), 3-to-2 (3V < VIN < 4V), and 1-to-1 (VIN < 3V), each optimized for efficiency across varying input and load conditions. Internal comparators (COMP1 and COMP2) govern mode selection and regulation, with COMP2 enabling mode skipping under heavy load to maintain VOUT regulation.
Regulation is achieved by sensing a resistive divider of VOUT and enabling the internal charge pump network only as needed - enabling high efficiency even at light loads (e.g., 25µA operating current at zero load). The SHDN/SS pin serves dual functions: logic-level shutdown (threshold 0.35V typ) and soft-start control via external capacitor ramping of the internal reference voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.0V ±4% (1.92V–2.08V); tightly regulated without external feedback components. |
| Input Voltage Range | 2.4V to 6V; supports single Li-ion (2.7–4.2V) and 3-cell NiMH (3.6–4.5V) sources directly. |
| Max Output Current | 100mA continuous; sufficient for low-power DSPs, smart card ICs, and microcontroller I/O rails. |
| Switching Frequency | 600kHz fixed; enables use of small 1µF ceramic flying capacitors and minimizes EMI filtering burden. |
| Quiescent Current | 25µA at no load; extends battery life in always-on portable devices such as handheld medical sensors. |
| Shutdown Current | 5µA max; ensures minimal drain during system sleep states, critical for long-term battery operation. |
| Operating Temperature | –40°C to +85°C (industrial grade); validated for use in clinical handheld instruments and ruggedized field equipment. |
| Output Ripple | 25mVP-P at 3.6V/100mA with 10µF ceramic COUT; manageable with standard bypassing, no LC filter required. |
Pinout & Package
Package: 8-lead plastic SO (Small Outline, narrow 0.150"), RoHS-compliant, tape-and-reel (TRPBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output voltage node | Delivers fixed 2V; disconnected from VIN during shutdown; requires ≥10µF low-ESR ceramic/tantalum bypass to GND. |
| C1– (Pin 2) | Flying capacitor C1 negative terminal | Connects to negative plate of first external 1µF flying capacitor; part of charge-transfer path in all conversion modes. |
| C1+ (Pin 3) | Flying capacitor C1 positive terminal | Connects to positive plate of first external 1µF flying capacitor; forms series/parallel switching network with C2. |
| VIN (Pin 4) | Main power input | Accepts 2.4–6V; must be bypassed with ≥10µF low-ESR capacitor; supplies energy to both flying caps and output stage. |
| SHDN/SS (Pin 5) | Shutdown and 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 C2 positive terminal | Connects to positive plate of second external 1µF flying capacitor; essential for 3-to-2 mode operation. |
| GND (Pin 7) | Analog and power ground reference | Must connect to low-impedance ground plane; shared return for VIN, VOUT, and flying caps to minimize noise coupling. |
| 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 and associated EMI, board area, and cost - ideal for ultra-thin portable designs. |
| Three-mode fractional conversion | Automatically selects 2-to-1, 3-to-2, or 1-to-1 charge-pump ratio 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 inrush to ~5mA with 10µF COUT. |
| Full protection suite | Indefinite short-circuit tolerance on VOUT plus overtemperature shutdown (trip ~150°C, resume ~125°C). |
| Ultra-low quiescent current | 25µA operating / 5µA shutdown enables multi-year battery life in intermittent-use medical and IoT edge sensors. |
Applications
| Handheld Medical Instruments | Smart Card Readers |
|---|---|
|
Use Scenario: Powering glucose meters, pulse oximeters, and portable ECG monitors powered by single Li-ion cells. IC Role / Device Role / Timing Role: Primary 2V supply rail for analog front-end (AFE) and low-voltage MCU core logic. Use Value: Delivers clean, regulated 2V without inductors - reducing PCB thickness and eliminating magnetic interference with sensitive analog measurements. |
Use Scenario: Providing regulated 2V to ISO 7816-compliant smart card interface ICs in point-of-sale terminals and access control readers. IC Role / Device Role / Timing Role: Dedicated voltage source for card VCC pin, meeting strict 2V ±4% specification under dynamic load transients. Use Value: Maintains regulation during card insertion/removal surges (1mA → 100mA step) with only 50mV AC-coupled overshoot and fast recovery. |
| Low-Power DSP Supplies | Cellular Phone Subsystems |
|
Use Scenario: Supplying bias voltage to ultra-low-power voice-processing DSPs in hearing aids and voice recorders. IC Role / Device Role / Timing Role: Efficient intermediate rail generator stepping down from main battery to DSP I/O or core voltage domain. Use Value: Achieves 82.9% efficiency at 100mA while drawing only 25µA idle current - extending runtime between charges. |
Use Scenario: Powering auxiliary subsystems (e.g., camera sensor interface, SIM card power, backlight driver logic) in legacy GSM/UMTS handsets. IC Role / Device Role / Timing Role: Secondary DC/DC converter providing isolated, low-noise 2V rail independent of main PMIC. Use Value: Enables modular design with no layout impact from inductor placement; SO-8 footprint simplifies drop-in replacement in existing SOIC layouts. |
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 | Fixed 1.8V output (±4%), identical pinout, same SO-8 package and electrical specs otherwise. | Used where 1.8V logic rails (e.g., low-voltage FPGAs, memory interfaces) replace 2V requirements. | Select LTC1503IS8-1.8 only when system-level voltage tolerance mandates 1.8V; not a functional substitute for 2V loads. |
| LTC1515CMS8-2 | 2V output, but uses synchronous step-up/step-down topology with external inductor; higher 500mA output capability; 10µA IQ. | Suitable for higher-current applications where inductor integration is acceptable and efficiency above 90% is prioritized. | LTC1515CMS8-2 offers greater current headroom but requires inductor layout and lacks true inductorless simplicity of LTC1503IS8-2#TRPBF. |
Compared with LTC1503IS8-1.8, the LTC1503IS8-2#TRPBF provides 2V output essential for specific analog sensor and smart-card interfaces; compared with LTC1515CMS8-2, it trades peak current capacity for zero-inductor design, smaller footprint, and lower EMI - making it optimal for size- and noise-sensitive portable medical and consumer applications.
Availability
LTC1503IS8-2#TRPBF is available at Aetrix Electronics and suitable for handheld medical instruments, smart card readers, and low-power DSP supplies requiring stable component supply with guaranteed industrial temperature performance and long-term lifecycle support.
Supply support for LTC1503IS8-2#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 technical and manufacturing continuity for legacy Linear power products.
The LTC1503 family was designed specifically for ultra-compact, battery-powered applications needing efficient, inductorless voltage reduction - targeting portable instrumentation, secure transaction devices, and space-constrained embedded systems.
FAQ
What is the maximum input voltage rating for the LTC1503IS8-2#TRPBF?
The LTC1503IS8-2#TRPBF has an absolute maximum input voltage of 6.5V across VIN, C1+, C1−, C2+, and C2− pins relative to GND. Its operational input range is specified from 2.4V to 6V. Exceeding 6V may damage internal switches; sustained operation above 6V violates the recommended operating conditions and voids parametric guarantees.
Does the LTC1503IS8-2#TRPBF require external feedback resistors to set the output voltage?
No, the LTC1503IS8-2#TRPBF does not require external feedback resistors. It is a fixed-output device with an internally trimmed 2.0V reference, delivering 2.0V ±4% (1.92V–2.08V) across 0–100mA load and full temperature range. This eliminates resistor placement, trimming, and drift concerns - simplifying design and improving long-term stability.
Can the LTC1503IS8-2#TRPBF drive a 100mA load continuously at 3.6V input?
Yes, the LTC1503IS8-2#TRPBF is rated for continuous 100mA output current at 3.6V input, achieving 82.9% typical efficiency and 25mVP-P ripple with proper 10µF ceramic COUT. Thermal performance remains within limits (θJA = 150°C/W for SO-8) under these conditions, provided adequate PCB copper area is used for heat dissipation.
How does the SHDN/SS pin function in the LTC1503IS8-2#TRPBF?
The SHDN/SS pin on the LTC1503IS8-2#TRPBF serves dual roles: applying <0.35V forces shutdown (5µA current draw), while connecting an external capacitor to GND enables soft-start. A 2µA internal pull-up ramps the pin voltage, which linearly controls the internal reference - allowing precise inrush current limiting (e.g., 4.7nF yields ~4ms VOUT ramp with 10µF COUT).
Is the LTC1503IS8-2#TRPBF pin-compatible with other members of the LTC1503 family?
Yes, the LTC1503IS8-2#TRPBF is pin-compatible with all SO-8 variants in the LTC1503 family, including LTC1503IS8-1.8, LTC1503CS8-2, and LTC1503CS8-1.8. All share identical pin assignments, electrical characteristics, and thermal behavior - enabling direct substitution where output voltage and temperature grade match system requirements.
LTC1503IS8-2#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):
- 2V
- 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
LTC1503IS8-2#TRPBF FAQ
1.How can I place an order for LTC1503IS8-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1503IS8-2#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 LTC1503IS8-2#TRPBF reliable?
The price and inventory of LTC1503IS8-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1503IS8-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1503IS8-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1503IS8-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1503IS8-2#TRPBF?
LTC1503IS8-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1503IS8-2#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 LTC1503IS8-2#TRPBF?
For technical support, including LTC1503IS8-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1503IS8-2#TRPBF requirements.
6.How does Aetrix verify that LTC1503IS8-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1503IS8-2#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 LTC1503IS8-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1503IS8-2#TRPBF?
All LTC1503IS8-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1503IS8-2#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 LTC1503IS8-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC1503IS8-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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