LM3212是TI公司的一款转换器（集成开关）产品，LM3212是Step-Down DC-DC Converter with Analog Bypass Mode for RF Power Amplifiers，本页介绍了LM3212的产品说明、应用、特性等，并给出了与LM3212相关的TI元器件型号供参考。
LM3212 - Step-Down DC-DC Converter with Analog Bypass Mode for RF Power Amplifiers - 转换器（集成开关） - DC/DC开关稳压器 - TI公司（Texas Instruments，德州仪器）
The LM3212 is a DC-DC converter optimized for powering GSM RF power amplifiers (PAs) from a single Lithium-Ion cell; however, it may also be used in other applications. The LM3212 steps down an input voltage from 2.7V to 5.5V to a dynamically adjustable output voltage of 0.5V to 3.4V. The output voltage is set through a VCON analog input that adjusts the output voltage to ensure efficient operation at all power levels of the RF PA.
The LM3212 has a unique Active Current Bypass (ACB) feature that speeds up output voltage transition times, provides extra drive and a low-resistance analog bypass. The LM3212 has an AUTO_BY pin to force the LM3212 into bypass mode during low input-voltage operation thus overriding the automatic analog bypass feature. Forced bypass can also be achieved by setting VCON > VIN/2.5.
In addition the LM3212 offers a fixed-frequency PWM mode to minimize RF interference and a shutdown mode to turn the device off and reduce battery consumption to 0.02 µA (typ.)
The LM3212 is available in a 16-bump lead-free DSBGA package. A 1.6 MHz switching frequency allows use of tiny surface-mount components for the required inductor and two ceramic capacitors.
- 1.6 MHz (typ.) PWM Switching Frequency
- ACB Reduces Inductor Requirements and Size
- Operates From a Single Li-Ion Cell (2.7V to 5.5V)
- Dynamically Adjustable Output Voltage (0.5V to 3.4V)
- 2.5A Maximum Load Current
- Analog Bypass Function With Low Bypass Resistance (33 mΩ typ.)
- High Efficiency to 95% with Internal Synchronous Rectification
- 16-bump DSBGA Package
- Current Overload Protection
- Thermal Overload Protection
