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LM3218 Folha de dados(PDF) 1 Page - Texas Instruments |
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LM3218 Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 21 page FB EN VDD VIN 0.8V to 3.6V SGND GND LM3218 VOUT = 2.5 x VCON VIN COUT CIN GND VOUT Integrated Inductor LM3218 VCON LM3218 www.ti.com SNOSB11B – MARCH 2008 – REVISED MARCH 2013 LM3218 650 mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers Check for Samples: LM3218 1 FEATURES DESCRIPTION The LM3218 is a DC-DC converter with inductor 2 • Includes 2.6 µH Inductor in Very Small Form which is optimized for powering RF power amplifiers Factor (3mm x 2.5mm x 1.2mm) (PAs) from a single Lithium-Ion cell. It steps down an • 2 MHz (typ.) PWM Switching Frequency input voltage in the range from 2.7V to 5.5V to an • Operates from a Single Li-Ion Cell (2.7V to adjustable output voltage of 0.8V to 3.6V. Output voltage is set by using a VCON analog input to control 5.5V) power levels and efficiency of the RF PA. • Adjustable Output Voltage (0.8V to 3.6V) The LM3218 offers superior electrical performance for • Fast Output Voltage Transient (0.8V to 3.4V in mobile phones and similar RF PA applications with a 25 µs typ.) reduced footprint (3mm x 2.5mm x 1.2mm). Fixed- • 650 mA Maximum Load Capability frequency PWM operation minimizes RF interference. • High Efficiency (95% typ. at 3.9 VIN, 3.4 VOUT at A shutdown function turns the device off and reduces 400 mA) battery consumption to 0.01 µA (typ.). • 8-pin POS Package The LM3218 is available in an integrated inductor • Current Overload Protection 8–pin POS package. A high switching frequency (2 MHz typ.) allows use of tiny surface-mount • Thermal Overload Protection components. Only two small external surface-mount components, two ceramic capacitors, are required. APPLICATIONS The overall board space is reduced up to 25% from • Cellular Phones the typical discrete inductor solution. • Hand-Held Radios • RF PC Cards • Battery-Powered RF Devices TYPICAL APPLICATION Figure 1. LM3218 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 © 2008–2013, 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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