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LM3205 Datasheet(PDF) 1 Page - Texas Instruments |
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LM3205 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 24 page  FB EN VDD PVIN VCON SW VIN 2.7V to 5.5V VOUT 0.8V to 3.6V 10 PF 4.7 PF SGND PGND 3.3 PH LM3205 VOUT = 2.5 x VCON LM3205 www.ti.com SNVS388D – JULY 2005 – REVISED MAY 2009 LM3205 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers Check for Samples: LM3205 1 FEATURES APPLICATIONS 2 • 2 MHz (typ.) PWM Switching Frequency • Cellular Phones • Operates from a single Li-Ion cell (2.7V to • Hand-Held Radios 5.5V) • RF PC Cards • Variable Output Voltage (0.8V to 3.6V) • Battery Powered RF Devices • 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 Packages • 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. TYPICAL APPLICATION Figure 1. LM3205 Typical Application 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2005–2009, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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