LTC1879 - 1.2A Synchronous Step-Down Regulator with 15µA Quiescent Current
Features
- High Efficiency: Up to 95%
- Low Quiescent Current: Only 15µA with No Load
- 550kHz Constant Frequency Operation
- 2.65V to 10V Input Voltage Range
- VOUT from 0.8V to VIN, IOUT to 1.2A
- True PLL Frequency Locking from 350kHz to 750kHz
- Power Good Output Voltage Monitor
- Low Dropout Operation: 100% Duty Cycle
- Burst Mode or Pulse Skipping Operation
- Current Mode Operation for Excellent Line and Load Transient Response
- Shutdown Mode Draws <1µA Supply Current
- ±2% Output Voltage Accuracy
- Overcurrent and Overtemperature Protected
- Available in 16-Lead SSOP Package
Typical Application
Description
The LTC1879 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Operating supply current is only 15µA with no load and drops to <1µA in shutdown. The input supply voltage range of 2.65V to 10V makes the LTC1879 ideally suited for both single and dual Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.
The switching frequency is internally set to 550kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC1879 can be externally synchronized from 350kHz to 750kHz. Burst Mode operation is inhibited during synchronization or when the SYNC/MODE pin is pulled low.
The internal synchronous rectifier switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with a 0.8V feedback reference voltage. The LTC1879 is available in a 16-lead SSOP 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 |
|---|---|---|---|---|---|
| LTC1879EGN#PBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC1879EGN#TRPBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | 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 | |
|---|---|---|---|---|---|---|
| LTC1879EGN#PBF | SSOP-16 | E | $4.26 | $3.60 | Yes | |
| LTC1879EGN#TRPBF | SSOP-16 | E | $3.66 | 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 |
|---|---|---|---|
| DC432A | LTC1879EGN | High Efficiency Synchronous Step-Down Regulator, 2.65V - 10V Input, 1.8V/2.5V/3.3Vout @ 1.2A | $75.00 | |
| Buy Now | |||
Applications
- Cellular Telephones
- Portable Computers
- Wireless Modems
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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:
LTC1879
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.
