TEXAS INSTRUMENTS LM3242TM-EV/NOPB 评估模块, LM3242TM-EV/NOPB
The is an evaluation module for LM3242 step down DC DC Converter. The LM3242 DC to DC converter optimized for powering 3G/4G RF power amplifiers PAs from a single Lithium Ion cell. It steps down an input voltage from 2.7V to 5.5V to an adjustable output voltage from 0.4V to 3.6V. Output voltage is set using a VCON analogue input for controlling power levels and efficiency of the RF power amplifier. There are five modes of operation depending on the current required. PWM Pulse Width Modulation, ECOEconomy, BP Bypass, Sleep and Shutdown. The LM3242 operates in PWM mode at higher load current conditions. Lighter loads cause the device to automatically switch into ECO mode. Shutdown mode turns the device off and reduces battery consumption to 0.1 µA typ. In low battery condition, bypass mode reduces the voltage dropout to less than 50 mV typ when VCON is less than 80 mV in 10 µs, the LM3242 will go into Sleep mode.
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- PWM Switching Frequency is typically 6MHz
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- Operates from a Single Li Ion Cell 2.7V to 5.5V
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- Adjustable output voltage ranges from 0.4V to 3.6V
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- 750mA maximum load capability and up to 1A in Bypass mode
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- High efficiency typically 95% at 3.9VIN, 3.3VOUT at 500mA
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- Automatic ECO/PWM/BP mode change
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- Current overload protection
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- Thermal overload protection
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- Soft start function