代理產線

LM3242

 2014-09-03

【基本資料】

【產品特性】

• PWM Mode w/ fixed freq (med to heavy load) to minimize RF interference
• ECO mode (light load) – reduced quiescent current
• Shutdown mode – battery consumption 0.1µA
• Bypass mode – reduces voltage dropout <50mV, extend longer battery usage time
• Sleep mode

• 6MHz (typ.) PWM Switching Frequency
• Operates from a Single Li-Ion Cell (2.7V to 5.5V)
• Adjustable Output Voltage (0.4V to 3.6V)
• 750 mA Maximum Load Capability (up to 1A in Bypass)
• High Efficiency (95% typ. at 3.9VIN, 3.3VOUT at 500 mA)
• Automatic ECO/PWM/BP mode change
• Current Overload Protection

【產品應用】

• HSDPA, LTE Cellular Phones
• Hand-Held Radios
• RF-PC Cards
• Battery Powered RF Devices

【文字介紹】

The LM3242 is a DC-DC converter optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion cell; however, it may be used in many other applications. 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 analog input for controlling power levels and efficiency of the RF PA.

The LM3242 offers five modes of operation. In PWM mode the device operates at a fixed frequency of 6MHz (typ.) at medium-to-heavy load range and minimizes RF interference. At light load, the device enters into ECO mode automatically and operates with reduced switching frequency. In ECO mode, the quiescent current is reduced and extends the battery life. 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.). The part also features a Sleep mode.