LM3691是TI公司的一款转换器（集成开关）产品，LM3691是用于便携式应用的高准确度、微型 1A、降压 DC-DC 转换器，本页介绍了LM3691的产品说明、应用、特性等，并给出了与LM3691相关的TI元器件型号供参考。
LM3691 - 用于便携式应用的高准确度、微型 1A、降压 DC-DC 转换器 - 转换器（集成开关） - DC/DC开关稳压器 - TI公司（Texas Instruments，德州仪器）
The LM3691 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 1A load current, over an input voltage range from 2.3V to 5.5V. There are several different fixed voltage output options available.
LM3691 has a mode-control pin that allows the user to select Forced PWM mode or ECO mode that changes modes between gated PWM mode and PWM automatically depending on the load. In ECO, LM3691 offers superior efficiency and very low Iq under light load conditions. ECO mode extends the battery life through reduction of the quiescent current during light load conditions and system standby.
The LM3691 is available in a 6-bump DSBGA package. Only three external surface-mount components, a 1 μH inductor, a 4.7 μF input capacitor and a 4.7 μF output capacitor, are required.
- VOUT = 0.75V to 3.3V
- ±1% DC Output Voltage Precision
- 2.3V ≤ VIN ≤ 5.5V
- 4 MHz Switching Frequency
- 64 μA (typ.) Quiescent Current in ECO Mode
- 1A Maximum Load Capability
- Automatic ECO/PWM Mode Switching
- Mode Pin to Select ECO/Forced PWM Mode
- 1 μH Inductor, 4.7 μF Input Capacitor (0603(1608) Case Size) and 4.7 μF Output Capacitor (0603(1608) Case Size)
- Current Overload and Thermal Shutdown Protections
- Only Three Tiny Surface-Mount External Components Required (Solution Size Less Than 15 mm2)
