EP5358xUI (X=L or H) is a 500mA PowerSOC. The EP5358xUI integrates MOSFET switching, control, compensation, and magnetics in an advanced 2.5mm x 2.25mm miniature QFN package. Magnetic integration technology enables tiny solution size, low output ripple, low component count, and high reliability while maintaining high efficiency. A complete solution can be implemented in as little as 15mm 2. The EP5358xUI uses 3-pin VID to easily select the output voltage setting. The output voltage settings operate within a range of 2 optimized to provide coverage for typical VOUT settings. The VID pin can change dynamic voltage scaling during fast operation. The EP5358LUI also has the option to use an external voltage divider. The EP5358xUI is the perfect solution for noise-sensitive and space-constrained applications requiring high efficiency.

Overview

EP5358xUI only needs 2 small MLCC capacitors for a complete DC-DC converter solution. The device integrates MOSFET switches, PWM controller gate drivers, compensation and inductors into a tiny 3mm x 3mm x 1.1mm tiny QFN package. Advanced package design, along with high level integration, provides very low output ripple and noise. EP5358xUI adopts voltage mode control for high noise immunity and load matching advanced ≤90nm load. 3-pin VID, allows the user to select the output voltage setting from 81. The EP5358xUI comes with two VID output voltage ranges. The EP5358HUI provides a VOUT setting from 1.8V to 3.3V, the EP5358LUI provides a VID setting from 0.8V to 1.5V, and also has an external resistor divider option to set the output in the 0.6V to VIN-0.25V range. The EP5358xUI provides the highest power density converter solution of any 500mA DCDC in the industry. The key enabler is this revolutionary integration of Enpirion's proprietary power MOSFET technology. Advanced MOSFET switches implemented in deep submicron CMOS provide high switching frequencies with very low switching losses and allow for high levels of integration. The semiconductor process allows all switches to seem less integrated, control and compensation circuits. Proprietary magnetic design provides a very high density/high value magnetic footprint in a small footprint. Enpirion's magnetically carefully matched control and compensation circuits yield an optimal guaranteed performance ratio solution over the entire operating range. Protection features include under voltage lock out (UVLO), over current protection (OCP), short circuit protection and thermal overload protection.

Integrated Inductors: Low Noise, Low EMI

The EP5358xUI uses a proprietary low-loss integrated inductor. The integrated inductor greatly simplifies the power supply design process. The inherent shielding and compactness of the integrated inductor reduces conducted and radiated noise that can couple into the printed circuit trace board. Additionally, the package layout is optimized to reduce electrical path lengths for high di/dt input AC ripple currents that are the main source of radiation from DC-DC converters. The integrated inductor provides an optimal solution to the complexity, design of low-power DCDC converters plagued by output ripple and noise.

Overcurrent/Short Circuit Protection

The current limit function is achieved by sensing the current flowing through the sense P-MOSFET and its reference current. When this level exceeds the P-FET turn-off, the N-FET turns on, pulling VOUT low. Hold this condition for about 0.5ms and then normal soft start begins. If the overcurrent condition persists, the cycle will repeat.

thermal shutdown

When too much power is dissipated in the chip, the junction temperature rises. Once the junction temperature exceeds the thermal shutdown temperature, the thermal shutdown circuit shuts down the output voltage of the converter to allow the device to cool. When the junction temperature is reduced by 15C °, the device will go through the normal startup process.

EP5358HUI application circuit diagram

EP5358LUI application circuit diagram