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Analog Devices Inc. LTC1911EMS8-1.5#TRPBF
- Part No.:
- LTC1911EMS8-1.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1911EMS8-1.5#TRPBF.pdf
- Description:
- IC REG CHG PUMP 1.5V 250MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,671
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Product details
Overview
LTC1911EMS8-1.5#TRPBF from Analog Devices (formerly Linear Technology) is a switched-capacitor step-down DC/DC converter delivering a regulated 1.5V ±4% output from 2.7V–5.5V input, supporting up to 250mA load current with no inductor required. It operates at 1.5MHz constant frequency, achieves >25% higher efficiency than LDOs, and integrates short-circuit and overtemperature protection for battery-powered handheld medical instruments and smart card readers.
For engineers reviewing the LTC1911EMS8-1.5#TRPBF datasheet, LTC1911EMS8-1.5#TRPBF pinout, LTC1911EMS8-1.5#TRPBF application, or LTC1911EMS8-1.5#TRPBF equivalent, key selection considerations include its 8-pin MSOP package, 180µA no-load operating current, Burst Mode™ operation for light-load efficiency, soft-start control via SS/SHDN pin, and compatibility with ceramic flying and bypass capacitors only.
Technical Context
The LTC1911EMS8-1.5#TRPBF uses fractional switched-capacitor conversion with automatic mode selection (2:1, 3:2, or 1:1) based on input voltage and load conditions to maximize efficiency across the full 2.7V–5.5V input range. Its internal control loop regulates charge transfer per cycle using two flying capacitors and a programmable resistance (RA) to maintain tight 1.5V output regulation.
It features constant-frequency 1.5MHz oscillator operation, enabling low-noise output and simplified filtering, plus integrated Burst Mode™ that reduces quiescent current to 10µA in shutdown and limits inrush via external soft-start capacitor on the SS/SHDN pin. Protection includes 600mA short-circuit current limiting and thermal shutdown at ~160°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.5V ±4% - tightly regulated rail for low-voltage DSP cores or microcontroller I/O domains |
| Max Output Current | 250mA - sufficient for single-core ARM Cortex-M or low-power FPGA I/O banks |
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion (2.7–4.2V), 3-cell NiMH (3.6–4.5V), or USB-powered systems |
| No-Load Input Current | 180µA typical - extends battery life in always-on sensor nodes or standby peripherals |
| Shutdown Current | 10µA typical - enables deep-sleep modes without external load switches |
| Oscillator Frequency | 1.5MHz (1.2–1.8MHz range) - allows compact 1µF ceramic flying capacitors and minimizes EMI filter size |
| Output Ripple | 12mVP-P at 250mA - meets noise-sensitive analog supply requirements without ferrite beads |
| Operating Temp Range | –40°C to 85°C - qualified for industrial handheld and portable medical equipment environments |
Pinout & Package
Package: 8-pin MSOP (3.0mm × 3.0mm × 0.86mm height), exposed pad not electrically connected, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input power supply connection | Accepts 2.7V–5.5V; requires ≥10µF ceramic bypass to ground for stable high-frequency operation |
| C2+ (Pin 2) | Flying capacitor C2 positive terminal | Connects to one plate of second 1µF ceramic flying capacitor; polarity reversal occurs during switching |
| C2– (Pin 3) | Flying capacitor C2 negative terminal | Connects to other plate of second 1µF ceramic flying capacitor; must use non-polarized ceramic only |
| GND (Pin 4) | Power and signal reference ground | Must connect directly to solid ground plane; critical for thermal dissipation and noise control |
| C1– (Pin 5) | Flying capacitor C1 negative terminal | Connects to one plate of first 1µF ceramic flying capacitor; shares ground return path with GND |
| VOUT (Pin 6) | Regulated 1.5V output | Disengaged from VIN during shutdown; requires ≥10µF low-ESR ceramic capacitor for stability and ripple suppression |
| C1+ (Pin 7) | Flying capacitor C1 positive terminal | Connects to other plate of first 1µF ceramic flying capacitor; forms charge-transfer path with C1– |
| SS/SHDN (Pin 8) | Soft-start and shutdown control | Open-drain compatible; <0.3V forces shutdown; external capacitor to GND controls VOUT ramp rate and inrush current |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components, reducing BOM cost, board area, and EMI concerns in space-constrained portable designs |
| Automatic 3-mode conversion | Selects optimal 2:1, 3:2, or 1:1 charge-pump ratio in real time to sustain >80% efficiency across full input and load range |
| Burst Mode™ operation | Reduces quiescent current to 10µA while maintaining 5mVP-P output ripple at light loads (≤30mA), ideal for intermittent sensing |
| Integrated protection | 600mA short-circuit current limit and thermal shutdown at ~160°C prevent damage during fault conditions without external circuitry |
| Soft-start programmability | External capacitor on SS/SHDN pin enables precise control of VOUT ramp time (e.g., 4.7nF → ~3ms), limiting inrush into 10µF output caps |
| Ceramic-only capacitor support | Requires only X7R/NP0 ceramics for all external caps-no tantalum or aluminum-ensuring reliability and avoiding reverse-voltage failure |
Applications
| Handheld Medical Instruments | Smart Card Readers |
|---|---|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by single-cell Li-ion batteries requiring clean, low-noise 1.5V rails for analog front-end and MCU I/O. IC Role / Device Role / Timing Role: Primary step-down regulator converting variable battery voltage (2.7–4.2V) to stable 1.5V supply with minimal ripple and no inductor-induced EMI. Use Value: Enables compact PCB layout with ceramic-only BOM, extends battery runtime via 180µA no-load current, and ensures measurement accuracy through low 12mVP-P ripple at full 250mA load. |
Use Scenario: Contactless EMV payment terminals using ISO/IEC 14443-A/B RF interfaces and secure microcontrollers needing tightly regulated 1.5V core voltage. IC Role / Device Role / Timing Role: Efficient, low-noise power source for secure element and NFC controller ICs, activated only during transaction sequences. Use Value: Burst Mode™ reduces average current during idle periods; shutdown disconnects VOUT from VIN to prevent leakage; 1.5V ±4% tolerance meets ISO 7816-3 voltage class requirements. |
| Low-Power DSP Supplies | Cellular Phone Baseband |
Use Scenario: Battery-powered voice processing modules in hearing aids or IoT edge nodes using TI C55x or ADI SHARC Lite DSPs with 1.5V I/O domains. IC Role / Device Role / Timing Role: Dedicated low-noise supply for DSP I/O banks, decoupled from noisy digital core rails via separate switched-capacitor regulation. Use Value: Constant 1.5MHz switching avoids beat frequencies with DSP clocks; 10µA shutdown current enables rapid power cycling between audio frames without voltage droop. |
Use Scenario: Auxiliary 1.5V rail for cellular phone baseband processors (e.g., Qualcomm QSC60x0) during low-power LTE idle states. IC Role / Device Role / Timing Role: Secondary regulator supporting sleep-mode logic and RF calibration circuits when main PMIC is in retention mode. Use Value: MSOP-8 footprint fits within tight baseband module spacing; 180µA operating current minimizes quiescent drain; soft-start prevents GSM burst interference during wake-up transitions. |
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 |
|---|---|---|---|
| LTC3250-1.5 | Higher efficiency (85% vs ~80%), lower IQ (35µA vs 180µA), ThinSOT-5 package (smaller footprint but no exposed pad) | Optimized for ultra-low-power wearables; lacks MSOP thermal performance for sustained 250mA loads | Select LTC3250-1.5 only if board space is critical and peak load duration is brief; LTC1911EMS8-1.5#TRPBF preferred for continuous 250mA operation with better thermal margin. |
| LTC3404 | Synchronous buck topology (inductor-based), 95% efficiency, 600mA output, 1.4MHz switching | Requires external inductor and diode; higher EMI but superior heavy-load efficiency and transient response | Choose LTC3404 where >250mA sustained current or tighter load regulation (<0.13mV/mA) is required; LTC1911EMS8-1.5#TRPBF remains optimal when inductor elimination and ceramic-only BOM are design priorities. |
Compared with LTC3250-1.5, the LTC1911EMS8-1.5#TRPBF offers superior thermal handling in MSOP-8 for continuous 250mA loads, while compared with LTC3404, it eliminates inductors and associated EMI filters-making it the only choice when board height, component count, and magnetic-free layout are mandatory.
Availability
LTC1911EMS8-1.5#TRPBF is available at Aetrix Electronics and suitable for handheld medical instruments, smart card readers, low-power DSP supplies, and cellular phone baseband subsystems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LTC1911EMS8-1.5#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 product lines with full technical documentation and long-term manufacturing commitment.
The LTC1911EMS8-1.5#TRPBF belongs to Linear's switched-capacitor DC/DC converter family, designed specifically for space-constrained, battery-powered applications where inductor elimination, low noise, and multi-mode efficiency optimization are essential.
FAQ
What is the maximum continuous output current capability of the LTC1911EMS8-1.5#TRPBF?
The LTC1911EMS8-1.5#TRPBF delivers up to 250mA continuous output current while maintaining regulation and thermal safety under worst-case conditions (85°C ambient, 5.5V input). At this load, output ripple remains ≤12mVP-P, and junction temperature stays below 125°C with proper PCB copper pour on the GND pin. Exceeding 250mA risks thermal shutdown activation.
Can the LTC1911EMS8-1.5#TRPBF operate from a single-cell Li-ion battery throughout its full discharge curve?
Yes - the LTC1911EMS8-1.5#TRPBF supports input voltages from 2.7V to 5.5V, fully covering the usable range of a single-cell Li-ion battery (2.7V–4.2V). Its automatic 2:1 → 3:2 → 1:1 mode switching maintains >75% efficiency even at 2.7V input and 250mA load, unlike fixed-ratio charge pumps that fail below 3.0V.
Why must polarized capacitors be avoided for the flying capacitors in the LTC1911EMS8-1.5#TRPBF?
The LTC1911EMS8-1.5#TRPBF reverses voltage polarity across flying capacitors during startup and mode transitions. Tantalum or aluminum electrolytic capacitors cannot withstand reverse bias and will fail catastrophically. Only ceramic (X7R/NP0) capacitors - inherently non-polarized and rated for ≥6.3V - ensure safe, reliable operation per the datasheet's explicit warning.
How does the SS/SHDN pin control both shutdown and soft-start functions in the LTC1911EMS8-1.5#TRPBF?
The SS/SHDN pin on the LTC1911EMS8-1.5#TRPBF serves dual roles: pulling it below 0.3V forces immediate shutdown (disconnecting VOUT from VIN), while connecting an external capacitor to GND enables soft-start. The internal 2µA pull-up current ramps the pin voltage, which linearly controls the internal reference voltage - thereby controlling VOUT slew rate and limiting inrush into output capacitance.
Is the LTC1911EMS8-1.5#TRPBF pin-compatible with the LTC1911EMS8-1.8#TRPBF?
Yes - the LTC1911EMS8-1.5#TRPBF and LTC1911EMS8-1.8#TRPBF share identical 8-pin MSOP packaging, pinout, electrical interface, and functional behavior. The only difference is factory-trimmed output voltage (1.5V vs 1.8V); both support the same input range, load current, protection features, and external component requirements.
LTC1911EMS8-1.5#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):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 250mA
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1911EMS8-1.5#TRPBF FAQ
1.How can I place an order for LTC1911EMS8-1.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1911EMS8-1.5#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 LTC1911EMS8-1.5#TRPBF reliable?
The price and inventory of LTC1911EMS8-1.5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1911EMS8-1.5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1911EMS8-1.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1911EMS8-1.5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1911EMS8-1.5#TRPBF?
LTC1911EMS8-1.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1911EMS8-1.5#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 LTC1911EMS8-1.5#TRPBF?
For technical support, including LTC1911EMS8-1.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1911EMS8-1.5#TRPBF requirements.
6.How does Aetrix verify that LTC1911EMS8-1.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1911EMS8-1.5#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 LTC1911EMS8-1.5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1911EMS8-1.5#TRPBF?
All LTC1911EMS8-1.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1911EMS8-1.5#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 LTC1911EMS8-1.5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1911EMS8-1.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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