By Keyue Ma Smedley; R D Middlebrook; Slobodan Ćuk; California Institute of Technology. Division of Engineering and Applied Science
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All rights reserved. Power conditioning for notebook and palmtop systems Many other features have been incorporated into the LT1432 to enhance operation in battery powered applications. An accurate current limit uses only 60mV sense voltage, allows for foldback, and uses ‘‘free’’ PC board trace material for the sense resistor. Logic controlled shutdown mode draws only 15mA battery current to allow for extremely long shutdown periods. 5V. The LT1432 has optional Burst Mode operation to achieve high efficiency at very light load currents (0mA to 100mA).
R10 and C3 provide a short delay. The mP can restart the regulator by turning the second input, pin-5, off and then back on. 6V. The standby current for the 5V, 2A regulator is less than 10mA. The regulator is switched on again when the battery voltage rises during charging. 20 * LCD Bias Circuit Generates À24V *Kool Mm is a registered trademark of Magnetics, Inc. 21 * The LTC1155 Dual MOSFET Driver Provides Gate Drive and Protection for a 4-Cell NiCad Charger and Regulator Power dissipation in the notebook computer itself is generally quite low.
The total load is less than 5mA. The LT1173 requires 110mA quiescent current, taken from the main logic supply line. 4V. 6V at 10mA. 27’s circuit, the backup converter will automatically kick in when the main AA cells are removed or dead. A lowbattery detector function is provided using the gain block inside the LT1173. 4V. 25, uses the LT1173 as a controller driving the FZT749, a 2A PNP in a SOT-223 package. 25V between its FB pin and its GND pin. 25V across R1. This forces the ‘‘GND’’ pin negative.