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请帮忙找一款合适的DCDC电源芯片

Other Parts Discussed in Thread: UC2843, LM317L, TPS61170, LM2585, TPS54061

您好,

       我们需要这样一款芯片,既可升压也可降压。我们的输入电源是+15V,现在想得到一路为24V /max 220mA,  另一路位12V /max 100mA. 。24V /max 220mA这一路设计比较有困难,功率要达到5W,我找了很多芯片但没发现合适的。请TI专家们指点一款合适的芯片。要求芯片封装不能太大,最好是SOT系列封装。先谢谢了!!!