LTC3772B Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller
The LTC®3772B is a constant frequency current mode step-down DC/DC controller in a low profile 8-lead SOT-23 (ThinSOTTM) and a 3mm × 2mm DFN package. The No RSENSE TM architecture eliminates the need for a current sense resistor, improving efficiency and saving board space.
The LTC3772B automatically switches into pulse skipping operation at light loads. It consumes only 200μA of quiescent current under a no-load condition.
The LTC3772B incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2V. To maximize the runtime from a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High switching frequency of 550kHz allows the use of a small inductor and capacitors. An internal soft-start smoothly ramps the output voltage from zero to its regulation point
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LTC3772B 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) * |
| LTC3772BEDDB | DFN | 8 | E | $2.73 | |
| LTC3772BEDDB#PBF | DFN | 8 | E | $2.73 | |
| LTC3772BEDDB#TR | DFN | 8 | E | $2.73 | $1.91 |
| LTC3772BEDDB#TRM | DFN | 8 | E | $2.73 | $1.93 |
| LTC3772BEDDB#TRMPBF | DFN | 8 | E | $2.73 | $1.93 |
| LTC3772BEDDB#TRPBF | DFN | 8 | E | $2.73 | $1.91 |
| LTC3772BETS8 | SOT | 8 | E | $2.71 | |
| LTC3772BETS8#PBF | SOT | 8 | E | $2.73 | |
| LTC3772BETS8#TR | SOT | 8 | E | $2.71 | $1.91 |
| LTC3772BETS8#TRM | SOT | 8 | E | $2.71 | $1.93 |
| LTC3772BETS8#TRMPBF | SOT | 8 | E | $2.71 | $1.93 |
| LTC3772BETS8#TRPBF | SOT | 8 | E | $2.71 | $1.91 |
| LTC3772EDDB | DFN | 8 | E | $2.73 | |
| LTC3772EDDB#PBF | DFN | 8 | E | $2.73 | |
| LTC3772EDDB#TR | DFN | 8 | E | $2.73 | $1.91 |
| LTC3772EDDB#TRM | DFN | 8 | E | $2.73 | $1.93 |
| LTC3772EDDB#TRMPBF | DFN | 8 | E | $2.73 | $1.93 |
| LTC3772EDDB#TRPBF | DFN | 8 | E | $2.73 | $1.91 |
| LTC3772ETS8 | SOT | 8 | E | $2.71 | |
| LTC3772ETS8#PBF | SOT | 8 | E | $2.73 | |
| LTC3772ETS8#TR | SOT | 8 | E | $2.71 | $1.91 |
| LTC3772ETS8#TRM | SOT | 8 | E | $2.71 | $1.93 |
| LTC3772ETS8#TRMPBF | SOT | 8 | E | $2.71 | $1.93 |
| LTC3772ETS8#TRPBF | SOT | 8 | E | $2.71 | $1.91 |
LTC3772B 数据手册及相关资料下载
- 数据手册(英文) : LTC3772B - Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller.PDF
- 可靠性数据 : R421 Reliability Data .PDF
