LM2614

LM2614 400mA Sub-Miniature Adjustable DC-DC Converter Optimized for RF Power Amplifiers August 2002 LM2614 400mA Sub-Miniature Adjustable DC-DC Converter Optimized for RF Power Amplifiers General Description The LM2614 DC-DC converter is optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion cell. It steps down an input voltage of 2.8V to 5.5V to an output of 1.0V to 3.6V at up to 400mA (300mA for B grade). Output voltage is set using an analog input to VCON in the application circuit. The device offers three modes for mobile phones and similar RF PA applications. Fixed-frequency PWM mode minimizes RF interference. A SYNC input allows synchronizing the switching frequency in a range of 500kHz to 1MHz. Low current hysteretic PFM mode reduces quiescent current to 160µA (typ.). Shutdown mode turns the device off and reduces battery consumption to 0.02µA (typ.). Current limit and thermal shutdown features protect the device and system during fault conditions. The LM2614 is available in a 10 bump micro SMD package. This packaging uses National’s chip-scale micro SMD technology and offers the smallest possible size. A high switching frequency (600kHz) allows use of tiny surface-mount components. The LM2614 can be dynamically controlled for output voltage changes from 1.0V to 3.6V in < 30µs. The device features external compensation to tailor the response to a wide range of operating conditions. Key Specifications Operates from a single LiION cell (2.8V to 5.5...