LM3204

LM3204 www.ti.com SNVS351B – JUNE 2005 – REVISED NOVEMBER 2005 LM3204 Miniature, Adjustable, Step-Down DC-DC Converter with Bypass Mode for RF Power Amplifiers Check for Samples: LM3204 FEATURES 1 2 2MHz (typ.) PWM Switching Frequency Operates from a single Li-Ion cell (2.7V to 5.5V) Adjustable Output Voltage (0.8V to 3.6V) Fast Turn on time when Enabled (50µs Typ.), 3GPP Compliant 300mA Maximum load capability (PWM mode) 500mA Maximum load capability (Bypass mode) PWM, Forced and Automatic Bypass Mode High Efficiency (96% Typ. at 3.6VIN, 3.2VOUT at 120mA) 10-pin micro SMD Package Current Overload Protection Thermal Overload Protection APPLICATIONS Cellular Phones Hand-Held Radios RF PC Cards Battery Powered RF Devices DESCRIPTION The LM3204 is a DC-DC converter optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion cell. It steps down an input voltage of 2.7V to 5.5V to an adjustable output voltage of 0.8V to 3.6V. The output voltage is set using an analog input ( VCON) for optimizing efficiency of the RF PA at various power levels. The LM3204 offers superior features and performance for mobile phones and similar RF PA applications. Fixedfrequency PWM mode minimizes RF interference. Bypass mode turns on an internal bypass switch to power the PA directly from the battery. LM3204 has both forced and automatic bypass modes. Shutdown mode turns the device off and reduces battery consumption to 0.1µA (typ.). The LM3204 is ava...