LTC1911 - Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter
Features
- Low Noise Constant Frequency Operation
- 2.7V to 5.5V Input Voltage Range
- No Inductors
- Typical Efficiency 25% Higher Than LDOs
- Shutdown Disconnects Load from VIN
- Output Voltage: 1.8V ±4% or 1.5V ±4%
- Output Current: 250mA
- Low Operating Current: IIN = 180µA Typ
- Low Shutdown Current: IIN = 10µA Typ
- Oscillator Frequency: 1.5MHz
- Soft-Start Limits Inrush Current at Turn On
- Short-Circuit and Overtemperature Protected
- Available in an 8-Pin MSOP Package
Typical Application
Description
The LTC1911 is a switched capacitor step-down DC/DC converter that produces a 1.5V or 1.8V regulated output from a 2.7V to 5.5V input. The part uses switched capacitor fractional conversion to achieve high efficiency over the entire input range. No inductors are required. Internal circuitry controls the step-down conversion ratio to optimize efficiency as the input voltage and load conditions vary. Typical efficiency is over 25% higher than that of a linear regulator.
A unique constant frequency architecture provides a low noise regulated output as well as lower input noise than conventional charge pump regulators. High frequency operation (fOSC = 1.5MHz) simplifies output filtering to further reduce conducted noise. To optimize efficiency,the part enters Burst Mode’ operation under light load conditions.
Low operating current (180µA with no load, 10µA in shutdown) and low external parts count (two 1µF flying capacitors and two 10µF bypass capacitors) make theLTC1911 ideally suited for space constrained battery powered applications. The part is short-circuit and over temperature protected, and is available in an 8-pin MSOP package.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC1911EMS8-1.5#PBF | MS-8 | MS8 | E | 05-08-1660 | Yes |
| LTC1911EMS8-1.5#TRPBF | MS-8 | MS8 | E | 05-08-1660 | Yes |
| LTC1911EMS8-1.8#PBF | MS-8 | MS8 | E | 05-08-1660 | Yes |
| LTC1911EMS8-1.8#TRPBF | MS-8 | MS8 | E | 05-08-1660 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC1911EMS8-1.5#PBF | MS-8 | E | $2.77 | $2.34 | Yes | |
| LTC1911EMS8-1.5#TRPBF | MS-8 | E | $2.40 | Yes | ||
| LTC1911EMS8-1.8#PBF | MS-8 | E | $2.77 | $2.34 | Yes | |
| LTC1911EMS8-1.8#TRPBF | MS-8 | E | $2.40 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC342A-A | LTC1911EMS8-1.8 | Low Noise, Constant Frequency Step-Down Charge Pump | Contact Factory | |
| DC342A-B | LTC1911EMS8-1.5 | Low Noise, Constant Frequency Step-Down Charge Pump | Contact Factory | |
| Buy Now | |||
Applications
- Handheld Computers
- Cellular Phones
- Smart Card Readers
- Portable Electronic Equipment
- Handheld Medical Instruments
- Low Power DSP Supplies
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Product Notifications
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC1911-1.5
LTC1911-1.8
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
