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TPS61222应用问题

Other Parts Discussed in Thread: TPS61222

用TPS61222把3.6v锂电池升到5V,电感用的22微亨,当输出电流达到30MA的时候,TPS61222输出电压被拉低到2.6V。输入电容,输出电容都是47微法的钽电容,但是把电感增加到220微亨时,输出电流30MA时,电压4.8V,纹波在50mV左右。数据手册上写着4.7微亨电感就足够了,不明白问题出在哪里?请指教