LTC1707 - High Efficiency Monolithic Synchronous Step-Down Switching Regulator
Features
- 600mA Output Current (VIN >/= 4V)
- High Efficiency: Up to 96%
- Constant Frequency: 350kHz Synchronizable to 550kHz
- 2.85V to 8.5V VIN Range
- 0.8V Feedback Reference Allows Low Voltage Outputs: 0.8V <= VOUT <= VIN
- No Schottky Diode Required
- 1.19V ±1% Reference Output Pin
- Selectable Burst Mode™ Operation/Pulse Skipping Mode
- Low Dropout Operation: 100% Duty Cycle
- Precision 2.7V Undervoltage Lockout
- Current Mode Control for Excellent Line and Load Transient Response
- Low Quiescent Current: 200µA
- Shutdown Mode Draws Only 11µA Supply Current
- Available in 8-Lead SO Package
Typical Application
Description
The LTC1707 is a high efficiency monolithic current mode synchronous buck regulator using a fixed frequency architecture. The operating supply range is from 8.5V down to 2.85V, making it suitable for both single and dual lithium-ion battery-powered applications. Burst Mode operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation, extending operating time in battery-powered systems.The switching frequency is internally set at 350kHz, allowing the use of small surface mount inductors. For noise sensitive applications it can be externally synchronized up to 550kHz. Burst Mode operation is inhibited during synchronization or when the SYNC/MODE pin is pulled low preventing low frequency ripple from interfering with audio circuitry. Soft-start is provided by an external capacitor.
The internal synchronous MOSFET switch increases efficiency and eliminates the need for an external Schottky diode, saving components and board space. Low output voltages down to 0.8V are easily achieved due to the 0.8V internal reference. The LTC1707 comes in an 8-lead SO 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 |
|---|---|---|---|---|---|
| LTC1707CS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1707CS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1707IS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LTC1707IS8#TRPBF | SO-8 | S8 | I | 05-08-1610 (S8) | 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 | |
|---|---|---|---|---|---|---|
| LTC1707CS8#PBF | SO-8 | C | $2.44 | $2.05 | Yes | |
| LTC1707CS8#TRPBF | SO-8 | C | $2.11 | Yes | ||
| LTC1707IS8#PBF | SO-8 | I | $4.35 | $3.05 | Yes | |
| LTC1707IS8#TRPBF | SO-8 | I | $3.11 | 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 |
|---|---|---|---|
| DC257A | LTC1707CS8 | 350kHz Constant Freq. Step Down Regulator, 1 or 2 Li-Ion or 2 to 6 NiCd Cell Input, 600mA Output | $100.00 | |
| Buy Now | |||
Applications
- Cellular Telephones
- Portable Instruments
- Wireless Modems
- RF Communications
- Distributed Power Systems
- Single and Dual Cell Lithium
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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:
LTC1707
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.
