Features Packages • 2 MHz (typ.) PWM Switching Frequency • Operates from a single Li-Ion cell (2.7V to 5.5V) • Variable Output Voltage (0.8V to 3.6V) • Fast Output Voltage Transient (0.8V to 3.6V in 20µs) • 650mA Maximum load capability • High Efficiency (96% Typ at 4.2VIN, 3.4VOUT at 400mA) from internal synchronous rectification • Current Overload Protection • Thermal Overload Protection • 8-Pin microSMD (Lead Free) • 10-Pin LLP Description The LM3205 is a DC-DC converter optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion cell, however they may be used in many other applications. It steps down an input voltage from 2.7V to 5.5V to a variable output voltage from 0.8V(typ.) to 3.6V(typ.). Output voltage is set using a VCON analog input for controlling power levels and efficiency of the RF PA. The LM3205 offers superior performance for mobile phones and similar RF PA applications. Fixed-frequency PWM operation minimizes RF interference. Shutdown function turns the device off and reduces battery consumption to 0.01 µA (typ.). The LM3205 is available in micro SMD package and LLP package. For all other package options contact your local NSC sales office. A high switching frequency (2 MHz) 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 LM3204▲ Auto Bypass, 300 Ma Pwm, 500 Ma Bypass 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
	LM3205 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers	2024 Kbytes	27-May-09

Featured Application Notes

Title		Size	Date	Other Language
	AN-1413: Application Note 1413 LM3205 Evaluation Board	639 Kbytes	17-Jan-06	中文

More Application Notes

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	AN-103: Application Note 103 LM340 Series Three Terminal Positive Regulators	421 Kbytes	3-Oct-02
	AN-1419: Application Note 1419 LM3202 Evaluation Board	642 Kbytes	17-Jan-06
	AN-1505: Application Note 1505 LM3207 Evaluation Board	1400 Kbytes	9-Jul-07	中文
	AN-1373: Application Note 1373 LM3200 Evaluation Board	620 Kbytes	4-Oct-05	中文
	AN-1391: Application Note 1391 LM3204 Evaluation Board	633 Kbytes	7-Mar-06	中文
	AN-1390: Application Note 1390 LM3203 Evaluation Board	655 Kbytes	7-Mar-06	中文
	AN-1420: Copy of 201713 - Application Note 1420 LM3208 Evaluation Board	652 Kbytes	26-Mar-09
	AN-1438: Application Note 1438 A Simple Method to Reduce DC Power Consumption in CDMA RF Power Amplifiers Through the LMV225 and an Efficient Switcher	512 Kbytes	6-Jan-06	中文

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3205SD-2	CMOS7	0	18406	0	0	1089000	4	309006723
LM3205SDX-2	CMOS7	0	18406	0	0	1089000	4	309006723
LM3205TL	CMOS7	0	18406	0	0	1089000	4	309006723
LM3205TLX	CMOS7	0	18406	0	0	1089000	4	309006723

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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