负-负开关转换器提供大电流和高效率

摘要： 外部运放 （MAX4322），使此开关升压转换器 （MAX668） 提供输出电流高达 4A 效率比 90%。运算放大器使对地规管电路 （而不是-5.2V 电源电压输入），从而避免输入的变化的影响上-3.6 v 输出。
Maxim > Design support > App notes > Amplifier and Comparator Circuits > APP 4834
Maxim > Design support > App notes > Power-Supply Circuits > APP 4834

Keywords: negative-to-negative supply, switch-mode converter, switch-mode boost converter, op amp

Feb 02, 2011
APPLICATION NOTE4834
Negative-to-Negative Switch-Mode Converter Offers High Current and
High Efficiency
By:Budge Ing

Abstract:An external op amp (MAX4322) enables this switch-mode boost converter (MAX668) to deliver output currents as high as
4A with efficiencies better than 90%. The op amp enables the circuit to regulate with respect to ground (instead of the -5.2V supply-
voltage input), thereby avoiding t