LTC3251 500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converters
The LTC®3251/LTC3251-1.2/LTC3251-1.5 are 2-phase charge pump step-down DC/DC converters that produce a regulated output from a 2.7V to 5.5V input. The parts use switched capacitor fractional conversion to achieve twice the typical efficiency of a linear regulator. No inductors are required. VOUT is resistor programmable from 0.9V to 1.6V or fixed at 1.2V or 1.5V, with up to 500mA of load current available.
A unique 2-phase spread spectrum architecture provides a very low noise regulated output as well as low noise at the input.* The parts have four operating modes: Continuous Spread Spectrum, Spread Spectrum with Burst Mode operation, Super Burst™ mode operation and shutdown.
Low operating current (35µA in Burst Mode operation, 10µA in Super Burst mode operation) and low external parts count make the LTC3251/LTC3251-1.2/LTC3251-1.5 ideally suited for space-constrained battery-powered applications. The parts are short-circuit and overtemperature protected, and are available in a thermally enhanced 10-pin MSOP package.
*U.S. Patent #6, 411, 531
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LTC3251 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) * |
| LTC3251EMSE | MSOP | 10 | E | $2.79 | $1.95 |
| LTC3251EMSE#PBF | MSOP | 10 | E | $2.79 | $1.95 |
| LTC3251EMSE#TR | MSOP | 10 | E | $2.01 | |
| LTC3251EMSE#TRPBF | MSOP | 10 | E | $2.01 | |
| LTC3251EMSE-1.2 | MSOP | 10 | E | $2.79 | $1.95 |
| LTC3251EMSE-1.2#PBF | MSOP | 10 | E | $2.79 | $1.95 |
| LTC3251EMSE-1.2#TR | MSOP | 10 | E | $2.01 | |
| LTC3251EMSE-1.2#TRPBF | MSOP | 10 | E | $2.01 | |
| LTC3251EMSE-1.5 | MSOP | 10 | E | $2.79 | $1.95 |
| LTC3251EMSE-1.5#PBF | MSOP | 10 | E | $2.79 | $1.95 |
| LTC3251EMSE-1.5#TR | MSOP | 10 | E | $2.01 | |
| LTC3251EMSE-1.5#TRPBF | MSOP | 10 | E | $2.01 |
