My Inquiry
My Account
Analog Devices Inc. LTC1503CS8-2#TRPBF
- Part No.:
- LTC1503CS8-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1503CS8-2#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 2V 100MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,885
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1503CS8-2#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 2V output, inductorless switched-capacitor step-down DC/DC converter optimized for battery-powered portable electronics. 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 soft-start and shutdown control - enabling compact, low-noise power rails in handheld medical instruments and smart card readers.
For engineers reviewing the LTC1503CS8-2#TRPBF datasheet, LTC1503CS8-2#TRPBF pinout, LTC1503CS8-2#TRPBF application, or LTC1503CS8-2#TRPBF equivalent, key selection criteria include its 2V ±4% regulated output, 25µA no-load operating current, 5µA shutdown current, 8-pin SO package compatibility, and absence of inductors - critical for space-constrained, low-quiescent-power designs requiring stable 2V supply from single Li-ion or triple NiMH cells.
Technical Context
The LTC1503CS8-2#TRPBF implements fractional switched-capacitor conversion using three dynamic modes: 2-to-1 (VIN > 4V), 3-to-2 (3V < VIN < 4V), and 1-to-1 gated-switch (VIN < 3V), automatically selected by internal comparators to maintain regulation across varying input and load conditions. Its mode-skipping logic responds to VOUT droop with ~17mV hysteresis to sustain 100mA output without thermal runaway.
Regulation relies on sensing VOUT via an internal resistive divider and enabling the charge pump only as needed, achieving high light-load efficiency. The SHDN/SS pin integrates both shutdown control (0.35V threshold) and soft-start via external capacitor ramping of the internal reference, limiting inrush current without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.0V ±4% (1.92V–2.08V); enables direct replacement of LDOs in 2V logic rails without feedback resistor network. |
| 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, microcontroller I/O banks, and smart card ICs. |
| Operating Current | 25µA typical at no load; reduces battery drain in standby mode for multi-day portable operation. |
| Shutdown Current | 5µA typical; allows deep-sleep states in battery-backed devices without significant leakage. |
| Switching Frequency | 600kHz free-running oscillator; enables use of small 1µF ceramic flying capacitors and minimizes EMI filtering burden. |
| Output Ripple | 25mVP-P at 3.6V/100mA with 10µF ceramic COUT; meets noise requirements for analog sensor interfaces and RF front-ends. |
Pinout & Package
Package: 8-lead plastic SO (Small Outline, narrow 0.150-inch width), RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output voltage node | Delivers fixed 2V output; 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 ceramic flying capacitor; forms charge transfer path in all operating modes. |
| C1+ (Pin 3) | Flying capacitor C1 positive terminal | Connects to positive plate of first external 1µF ceramic flying capacitor; participates in 2-to-1 and 3-to-2 charge pumping cycles. |
| VIN (Pin 4) | Main input supply connection | Accepts 2.4–6V input; requires ≥10µF low-ESR bypass capacitor to minimize input ripple and ensure transient response. |
| SHDN/SS (Pin 5) | Combined shutdown and soft-start control | Drives shutdown when ≤0.35V; soft-start enabled by external capacitor to GND; internal 2µA pull-up enables open-drain interface. |
| C2+ (Pin 6) | Flying capacitor C2 positive terminal | Connects to positive plate of second external 1µF ceramic 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 all capacitors and flying paths to minimize noise coupling. |
| C2– (Pin 8) | Flying capacitor C2 negative terminal | Connects to negative plate of second external 1µF ceramic flying capacitor; completes dual-capacitor charge transfer network. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and associated EMI, reducing PCB area by >40% vs. buck regulators and simplifying layout for handheld form factors. |
| 25% higher efficiency than LDOs | Delivers 82.9% efficiency at 3.6V/100mA vs. ~65% for comparable LDOs, extending battery life in 100mA peak-load applications. |
| Soft-start with user-tunable ramp | External capacitor on SHDN/SS pin controls VOUT rise time (e.g., 4.7nF → 4ms ramp), limiting inrush to ~5mA and preventing input rail collapse. |
| Robust protection suite | Indefinite short-circuit survival at VOUT, overtemperature shutdown at ~150°C, and automatic recovery at ~125°C ensure field reliability. |
| Ultra-low quiescent current | 25µA operating / 5µA shutdown currents enable multi-week shelf life in coin-cell–powered devices and maintenance-free remote sensors. |
Applications
| Smart Card Readers | Handheld Medical Instruments |
|---|---|
Use Scenario: Powering ISO 7816-compliant smart card ICs during contact-based authentication and data exchange. IC Role / Device Role / Timing Role: Provides stable 2V supply to card interface logic and secure element, synchronized with reader command timing. Use Value: Eliminates need for bulky inductors while maintaining <25mV ripple under 100mA pulsed loads, ensuring error-free card communication per EMVCo standards. |
Use Scenario: Supplying analog front-end (AFE) and low-power MCU in portable blood glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Generates clean 2V rail for precision ADC reference and op-amp biasing during measurement bursts. Use Value: 25µA quiescent current extends single AAA battery life beyond 6 months in intermittent-use devices, meeting FDA Class II portability requirements. |
| Low-Power DSP Supplies | Cellular Phones (Baseband Subsystems) |
Use Scenario: Delivering regulated 2V to ultra-low-power DSP cores in voice-recognition edge nodes and acoustic sensors. IC Role / Device Role / Timing Role: Powers DSP I/O and memory interface during active inference cycles, entering 5µA shutdown between wake-ups. Use Value: Mode-skipping architecture maintains >80% efficiency across 2.7–4.2V Li-ion discharge curve, avoiding efficiency cliffs seen in fixed-ratio charge pumps. |
Use Scenario: Supplying 2V auxiliary rail for SIM card interface, audio codec biasing, and backlight driver logic in legacy GSM/EDGE handsets. IC Role / Device Role / Timing Role: Replaces discrete LDO + external pass transistor in space-limited phone mainboard layouts. Use Value: SO-8 footprint matches legacy LDO footprints, enabling drop-in upgrade to 25% longer talk-time without PCB redesign. |
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 | Identical electrical specs but in 8-lead MSOP package (3mm × 3mm vs. SO-8's 4.9mm × 3.9mm); 150°C/W θJA vs. 200°C/W for SO-8. | Better thermal performance in dense layouts; requires rework of land pattern and stencil. | Select for thermally constrained designs where board space permits MSOP footprint. |
| LTC1515CS8 | Adjustable output (1.5V–5V via external resistors); 50mA max output; 40µA operating current; same SO-8 package. | Supports multiple voltage rails from one BOM; lower current capability limits use to sub-50mA logic domains. | Select when system requires flexible 2V+ outputs and load current stays below 50mA. |
Compared with LTC1503CS8-2#TRPBF, the LTC1503CMS8-2 offers superior thermal dissipation in compact spaces, while the LTC1515CS8 trades fixed 2V accuracy and 100mA drive for programmable output and simpler multi-rail integration - making LTC1503CS8-2#TRPBF optimal for cost-sensitive, high-current 2V applications where layout space and thermal headroom are constrained.
Availability
LTC1503CS8-2#TRPBF is available at Aetrix Electronics and suitable for handheld medical instruments, smart card readers, and low-power DSP supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1503CS8-2#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 its portfolio of high-performance power management ICs, known for innovation in switched-capacitor, LDO, and DC/DC architectures.
The LTC1503 series was designed specifically for battery-powered portable electronics needing efficient, inductorless 1.8V/2V step-down conversion - targeting applications where PCB area, EMI, and quiescent current are primary constraints.
FAQ
What is the maximum input voltage rating for the LTC1503CS8-2#TRPBF?
The LTC1503CS8-2#TRPBF has an absolute maximum input voltage rating of 6.5V across VIN, C1+, C1−, C2+, and C2− terminals relative to GND. Its operational input range is specified from 2.4V to 6V; applying voltages above 6V may cause permanent damage even if within the absolute maximum limit, as internal charge pump switches are rated for 6V continuous operation per the datasheet's recommended conditions.
Does the LTC1503CS8-2#TRPBF require external compensation components?
No, the LTC1503CS8-2#TRPBF does not require external compensation components. Its regulation loop is fully internal and optimized for standard 1µF flying capacitors and 10µF output capacitors. Stability is guaranteed across the full input range (2.4V–6V) and load range (0–100mA) when using low-ESR ceramic or tantalum capacitors as specified - eliminating design iteration time for loop compensation.
Can the LTC1503CS8-2#TRPBF operate with ceramic flying capacitors smaller than 1µF?
Yes, the LTC1503CS8-2#TRPBF can operate with ceramic flying capacitors as small as 0.47µF in low-output-current applications (<10mA), as confirmed in the Applications Information section. However, for full 100mA capability and specified ripple performance, 1µF is required - using smaller values degrades output regulation and increases ripple due to reduced charge transfer per cycle.
How does the LTC1503CS8-2#TRPBF behave during a sustained VOUT short-circuit condition?
The LTC1503CS8-2#TRPBF survives indefinite VOUT-to-GND short circuits by limiting output current to 8–50mA (typical 22mA) when VOUT drops below 150mV, as stated in the Electrical Characteristics table. Internal thermal protection shuts down the device if junction temperature exceeds ~150°C, then auto-restarts once cooled to ~125°C - ensuring no latch-up or damage occurs during field-level fault events.
Is the LTC1503CS8-2#TRPBF pin-compatible with the LTC1503CS8-1.8 variant?
Yes, the LTC1503CS8-2#TRPBF is pin-compatible with the LTC1503CS8-1.8 variant - both share identical 8-pin SO package dimensions, pinout assignment, and electrical interface. The only difference is the factory-trimmed output voltage (2.0V vs. 1.8V), allowing direct substitution in designs where 2V regulation is acceptable, provided system-level voltage tolerance permits.
LTC1503CS8-2#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
LTC1503CS8-2#TRPBF FAQ
1.How can I place an order for LTC1503CS8-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1503CS8-2#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 LTC1503CS8-2#TRPBF reliable?
The price and inventory of LTC1503CS8-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1503CS8-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1503CS8-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1503CS8-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1503CS8-2#TRPBF?
LTC1503CS8-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1503CS8-2#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 LTC1503CS8-2#TRPBF?
For technical support, including LTC1503CS8-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1503CS8-2#TRPBF requirements.
6.How does Aetrix verify that LTC1503CS8-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1503CS8-2#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 LTC1503CS8-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1503CS8-2#TRPBF?
All LTC1503CS8-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1503CS8-2#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 LTC1503CS8-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC1503CS8-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1503CS8-2#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
