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LM26 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM26 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 16 page 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 re- duces battery consumption to 0.02µA (typ.). Current limit and thermal shutdown features protect the de- vice 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 tech- nology and offers the smallest possible size. A high switching frequency (600kHz) allows use of tiny surface-mount com- ponents. The LM2614 can be dynamically controlled for output volt- age changes from 1.0V to 3.6V in <30µs. The device fea- tures external compensation to tailor the response to a wide range of operating conditions. Key Specifications n Operates from a single LiION cell (2.8V to 5.5V) n Adjustable output voltage (1.0V to 3.6V) n ± 1% DC feedback voltage precision n 400mA maximum load capability(300mA for B grade) n 600µA typ PWM mode quiescent current n 0.02µA typ shutdown current n 600kHz PWM switching frequency n SYNC input for PWM mode frequency synchronization from 500kHz to 1MHz n High efficiency (96% typ at 3.9V IN, 3.6VOUT and 200mA) in PWM mode from internal synchronous rectification n 100% Maximum Duty Cycle for Lowest Dropout Features n Sub-miniature 10-bump thin micro SMD package n Uses small ceramic capacitors n 5mV typ PWM mode output voltage ripple(C OUT = 22µF) n Internal soft start n Current overload protection n Thermal Shutdown n External compensation Applications n Mobile Phones n Hand-Held Radios n RF PC Cards n Battery Powered RF Devices August 2002 © 2002 National Semiconductor Corporation DS200367 www.national.com |
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