电源备份开关

摘要：一个微处理器监控IC和两个外部MOSFET开关形成一个低电压的备用电源，当主电源发生故障时，可以提供几安培。

Maxim/Dallas > App Notes > CIRCUIT PROTECTION MICROPROCESSOR SUPERVISOR CIRCUITS

Keywords: backup power supplies, microprocessor supervisors, low voltage, MOSFET switches Aug 27, 2004

APPLICATION NOTE 3323
Power-Backup Switch

A microprocessor-supervisor IC and two external MOSFET switches form a low-voltage backup power supply
that can provide several amperes when the main supply fails.


Every subsystem in an electronic product depends on a reliable power supply. One way to achieve high reliability
is to have a backup power supply, in case the main supply fails. The classic method for adding backup power is
to have each supply connected with a series diode to a common output. But with today's lower supply voltages,
the power lost in the series diode's forward voltage dr