The MCP1601 is a synchronous buck (step-down) switching regulator that can continuously supply 500mA of load current. This DC/DC converter can provide output voltages of 0.9V to Vin with an operating efficiency that can exceed 92%. Althoug 500 mA synchronous buck Regulator From old datasheet system
Replaced by TPS40075 : Midrange Input synchronous buck controller With Voltage Feed-Forward 20-QFN -40 to 85 Mid Range Input synchronous buck controller with Advanced Sequencing and Output Margining 24-VQFN -40 to 85 3-TERMINAL 0.1A NEGATIVE VOLTAGE REGULATORS 三端0.1A负电压调节器