Features • 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 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. Fixed-frequency 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 available in a 10-pin lead free micro SMD package. A high switching frequency (2MHz) allows use of tiny surface-mount components. Only three small external surface-mount components, an inductor and two ceramic capacitors are required. Applications • Cellular Phones • Hand-Held Radios • RF PC Cards • Battery Powered RF Devices

Also Recommended LM3203▲ Manual Bypass, 300mA PWM, 500mA Bypass LM3205▲ No Bypass, 100% PWM, 650mA LMV221 50 MHz - 3.5 GHz, 40dB, RF Transmit Power Detector LMV225 450 MHz - 2 GHz, 30dB, RF Transmit Power Detector MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance *click for larger image

Datasheet

Title		Size	Date	Other Language
	LM3204 Miniature, Adjustable, Step-Down DC-DC Converter with Bypass Mode for RF Power Amplifiers	898 Kbytes	15-Nov-05

Featured Application Notes

Title		Size	Date	Other Language
	AN-1391: Application Note 1391 LM3204 Evaluation Board	633 Kbytes	7-Mar-06	中文

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