LTC1773 Synchronous Step-Down DC/DC Controller
The LTC®1773 is a current mode synchronous buck regulator controller that drives external complementary power MOSFETs using a fixed frequency architecture. The operating supply range is from 2.65V to 8.5V, making it suitable for 1- or 2-cell lithium-ion battery powered applications. Burst Mode® operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation which extends operating time in battery-operated systems.
The operating frequency is internally set at 550kHz, allowing the use of small surface mount inductors. For switching-noise sensitive applications, it can be synchronized up to 750kHz. Peak current limit is user programmable with an external high side sense resistor. A SYNC/FCB control pin guarantees regulation of secondary windings regardless of load on the main output by forcing continuous operation. Burst Mode operation is inhibited during synchronization or when the SYNC/FCB pin is pulled low to reduce noise and RF interference. Soft-start is provided by an external capacitor.
Synchronous rectification increases efficiency and eliminates the need for a Schottky diode, saving components and board space. The LTC1773 comes in a 10-lead MSOP package
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LTC1773 订购信息和价格参考Package Variations and Pricing
| 器件型号 | 封装 | 引脚 | 温度 | 价格 (以 1 ~ 99 片为批量) | 价格 (以 1000 片为批量) * |
| LTC1773EMS | MSOP | 10 | E | $2.90 | $2.50 |
| LTC1773EMS#PBF | MSOP | 10 | E | $2.90 | $2.50 |
| LTC1773EMS#TR | MSOP | 10 | E | $2.56 | |
| LTC1773EMS#TRPBF | MSOP | 10 | E | $2.56 |
LTC1773 数据手册及相关资料下载
- 数据手册(英文) : LTC1773 - Synchronous Step-Down DC/DC Controller.PDF
- 可靠性数据 : R384Reliability Data .PDF
