MP5519

The MP5519 is a monolithic power management solution designed to manage energy storage and release in enterprise solid-state drives (SSDs). It integrates an input current limit (I_{LIMIT_E-FUSE}) switch and a bidirectional buck-boost converter for energy management. The e-fuse features a low on resistance, current limiting, and reverse current blocking.

The configurable I_{LIMIT_E-FUSE} prevents inrush current during start-up. Reverse current blocking prevents backup energy from flowing to the failing input voltage (V_IN) port to fully utilize the backup energy during a power outage.

Backup energy is stored in the storage capacitors. MPS’s patented energy storage and release management control circuit minimizes the storage capacitor requirement. The IC provides a high storage voltage (V_STRG) to store energy in the capacitors. If an input outage occurs, this energy is released to the system during a hold time (t_HOLD). V_STRG and the buck release voltage (V_{BUCK_RLS}) are both configurable for different system applications.

The configurable charge current (I_CHARGE) is provided to ramp up V_STRG in a controllable manner. Constant-on-time (COT) control reduces the voltage dip during the transition between boost charge mode and buck release mode. Only one inductor is required, which minimizes the total solution size.

The device also features an I²C interface and an internal analog-to-digital converter (ADC). I_{LIMIT_E-FUSE} can be configured via the I²C. The I²C can also perform capacitor health tests. The internal ADC monitors V_IN, input current, and input power.

The MP5519 requires a minimal number of readily available, standard external components, and is available in a QFN-25 (4mmx4mm) package.