This Quanum 40A Multi-Copter Brushless Speed Controller is exactly what you are looking for in a lightweight, super powerful speed controller. The first  ESC with Synchronous Rectification hardware design in the market.

This Quanum 40A Multi-Copter Brushless Speed Controller Programmable ESC with 5V/3A BEC. The ESC power input use is extremely low output resistance greatly enhances the power stability and has a protective effect on the battery. Separately voltage regulator IC for the microprocessor. providing good anti-jamming capability. Using Simon K’s a dedicated multi-copter program tgy_debug, and the master chip with high stability crystal oscillator, making the motor control more precise.

Features:

1. Drive tube and high-power Mos, and Mos tube plus a separate heat sink, Extreme low output resistance of the PCB(printed circuit board), super current endurance.
2. The power input uses extremely low output resistance greatly enhancing the power stability and having a protective effect on the battery.
3. Safety electrical function: when the power is turned on, regardless of the throttle stick in any position does not start the motor immediately, to avoid personal injury.
4. Separately voltage regulator IC for the microprocessor. providing good anti-jamming capability.
5. Supported motor speed (Maximum): 210000 RPM (2 poles), 70000 RPM (6 poles), 35000 RPM (12 poles).
6. Using Simon K’s a dedicated multi-copter program tgy_debug, and the master chip with high stability crystal oscillator, making the motor control more precise.