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LM2706TLX Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM2706TLX Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 15 page  LM2706 Miniature, Variable, Step-Down DC-DC Converter with Bypass for RF Power Amplifiers General Description The LM2706 DC-DC converter is optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion cell. It may also be used in many other applications. It steps down an input voltage from 2.7V to 5.5V to a variable output from 1.5V to 3.25V up to 300 mA. Output voltage is set using a V CON analog input for controlling power levels and efficiency of the RF PA. An internal bypass switch allows direct con- nection to the battery for maximum power to the RF PA. The device offers 4 modes for mobile phones and similar RF PA applications. Fixed-frequency PWM mode minimizes RF interference. Forced Bypass mode turns on an internal by- pass switch to power the PA directly from the battery. Auto- matic bypass mode minimizes dropout by turning on the bypass switch when the battery decays to near the output voltage. Shutdown mode turns the device off and reduces battery consumption to 0.1 µA (typ.). The device also offers internal synchronous rectification for high efficiency (95% typ at 3.25 V OUT, 200 mA, 3.9 VIN). Current limit and thermal overload protection protects the device and system during fault conditions. The LM2706 is available in a 10-pin lead free micro SMD package. This packaging uses National’s chip-scale micro SMD technology and offers the smallest possible size. A high switching frequency (600 kHz) allows use of tiny surface- mount components. Only three small external surface-mount components, an inductor and two ceramic capacitors, are required. Key Specifications n Operates from a single LiION cell (2.7V to 5.5V) n Variable output voltage (1.5V to 3.25V) n ± 2% DC output voltage precision n Internal 105 m Ω (typ) bypass switch n 300 mA maximum load capability n 1.4 mA typ quiescent current n 0.1 µA typ shutdown current n 600 kHz PWM switching frequency n High efficiency (95% typ at 3.9 V IN, 3.25 VOUT at 200 mA) from internal synchronous rectification Features n Forced and Automatic Bypass modes n Miniature 10-pin lead free micro SMD package n Only three tiny surface-mount external components required n Uses small ceramic capacitors n Low output voltage ripple (<10 mV typ) n Internal soft start n Current overload protection n No external compensation Applications n Mobile Phones n Hand-Held Radios n RF PC Cards n Battery Powered RF Devices Typical Application Circuit 20040901 PRELIMINARY February 2004 © 2004 National Semiconductor Corporation DS200409 www.national.com |
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