看了下TPS61170 感觉可行
TPS61170 特性
3-V to 18-V Input Voltage Range
High Output Voltage: Up to 38 V
1.2-A integrated Switch
1.2-MHz Fixed Switching Frequency
12 V at 300 mA and 24 V at 150 mA from 5-V Input (Typical)
Up to 93% Efficiency
On-The-Fly Output Voltage Reprogramming
Skip-Switching Cycle for Output Regulation at Light Load
Built-in Soft Start
6-Pin, 2 mm × 2 mm QFN Package
APPLICATIONS
5-V to 12-V and 24-V, 12-V to 24-V Boost Converter
Buck Boost Regulation Using SEPIC Topology
ADSL Modems
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