Abstract: Two circuits are described. The first uses external MOSFETs driven by the Power OK (POK) output of a Li-cell charger IC (MAX8814), to switch a load between battery and charging source without intervention from a microcontroller or system software. For charger ICs without a POK output (such as the MAX1507), the second circuit does the same switching using MOSFETs and a comparator (MAX920). Maxim > Design support > App notes > Amplifier and Comparator Circuits > APP 4840 Maxim > Design support > App notes > Battery Management > APP 4840 Keywords: load switching, rechargeable battery-powered systems, Li+ battery chargers, power OK (POK) outputs Feb 10, 2011 APPLICATION NOTE4840 Battery/Charger Load Switch Approximates Ideal Diode By:Budge Ing Hubert Bugajski Abstract:Two circuits are described. The first uses external MOSFETs driven by the Power OK (POK) output of a Li-cell charger IC (MAX8814), to switch a load between battery and charging source without intervention from a microcontroller or system software. For charger ICs without a POK output (……