BUY LT1172 https://www.utsource.net/itm/p/37843.html
100kHz, 1.25A, High Efficiency Switching Regulators100kHz, 1.25A,,
Description: The LT1172 is a micropower, high speed, low power operational amplifier. Features: * Low power consumption: 1.5mA/amplifier * High speed: 1MHz gain bandwidth product * Low input offset voltage: 2mV * Low input bias current: 10nA * Low input offset current: 5nA * Low noise: 5nV/√Hz Applications: * Battery-powered instrumentation * Portable medical equipment * Portable communications * Portable consumer products * Portable test equipment (For reference only)