LM3212 - Step-Down DC-DC Converter with Analog Bypass Mode for RF Power Amplifiers

LM3212是TI德州仪器公司的一款转换器（集成开关）产品，LM3212是Step-Down DC-DC Converter with Analog Bypass Mode for RF Power Amplifiers，本站介绍了LM3212的封装应用图解、特点和优点、功能等，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 - 德州仪器

产品描述

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.

产品特性

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

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