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Looking for medium voltage, external FETs, synchronous & capable of sinking current, buck-converter (for TEC / peltier driver)

Other Parts Discussed in Thread: TPS55288


I'm evaluating some options for driving a TEC / peltier device.  One such option is a buck converter, as opposed to H-bridge / motor-driver / etc. 

Ability to sink current is strictly necessary. 

External FETs almost strictly necessary, otherwise 5A minimum output current, 8A+ preferred.

Input voltage is 15V. Output voltage is <15V, buck style.  up to 28V would be ideal and cover practically all use-cases.

Higher frequency is best, for L/C size reasons. 

Down-to-0V regulation is ideal but not strictly necessary. 

high-volume or otherwise low risk of obsolence / stock-issues, preferred. 

I posted something similar in the motor-driver forum, as well. 

DRV8432: Looking for high power options for TEC (Peltier) driver - Motor drivers forum - Motor drivers - TI E2E support forums