MPM3686 Step-Down Power Module
MPS' MPM3686 18 V, 20 A, step-down power module in a 12 mm x 15 mm x 4 mm QFN
Monolithic Power Systems' MPM3686 is an easy-to-use, fully integrated, 20 A step-down DC/DC power module. It integrates the DC/DC converter, power inductor, input/output capacitors, and the necessary resistors/capacitors in a compact QFN 12 mm x 15 mm x 4 mm package. This total power solution needs as few as two external components (one resistor and one capacitor) to work. The MPM3686 can deliver a 20 A output current over a wide input supply voltage range with excellent load and line regulation.
The MPM3686 uses constant-on-time (COT) control to provide fast transient response and ease loop stabilization.
The default under-voltage lockout threshold is internally set around 4.1 V, but a resistor network on the ENABLE pin can increase this threshold. The MPM3686 has an internal LDO to power the control circuits and the integrated power devices. This LDO can be disabled by an external 5 V to boost the efficiency.
The MPM3686 has an internal soft-start (SS) timer (about 3 ms). It can be increased with an extra SS capacitor. An open drain power good signal indicates that the output voltage is within nominal voltage range.
The MPM3686 has fully integrated protection features that include over-current protection, over-voltage protection, and thermal shutdown.