Datasheet | Intel® Enpirion® Power Solutions: EP5388QI
Page 10
FUNCTIONAL DESCRIPTION
Synchronous DC-DC Step-Down PowerSoC
The EP5388QI is a complete DC-DC converter solution requiring only two low cost MLCC capacitors. MOSFET
switches, PWM controller, Gate-drive, compensation, and inductor are integrated into the tiny 3mm x 3mm x
1.1mm package to provide the smallest footprint possible while maintaining high efficiency, low ripple, and
high performance. The converter uses voltage mode control to provide the simplest implementation and high
noise immunity. The device operates at a 4MHz switching frequency. The high switching frequency allows for
a wide control loop bandwidth providing excellent transient performance. The high switching frequency
further enables the use of very small components making possible this unprecedented level of integration.
Intel Enprion’s proprietary power MOSFET technology provides very low switching loss at frequencies of 4
MHz and higher, allowing for the use of very small internal components, and high performance. Integration of
the magnetics virtually eliminates the design/layout issues normally associated with switch-mode DC-DC
converters. All of this enables much easier and faster incorporation into various applications to meet
demanding EMI requirements.
Output voltage is chosen from seven preset values via a three pin VID voltage select scheme. An external
divider option enables the selection of any voltage in VIN to 0.6V range. This reduces the number of
components that must be qualified and reduces inventory burden. The VID pins can be toggled on the fly to
implement glitch free dynamic voltage scaling.
Protection features include under-voltage lock-out (UVLO), over-current protection (OCP), short circuit
protection, and thermal overload protection.
Integrated Inductor
Intel Enpirion has introduced the world’s first product family featuring integrated inductors. The EP5388QI
utilizes a proprietary low loss integrated inductor. The use of an internal inductor localizes the noises
associated with the output loop currents. The inherent shielding and compact construction of the integrated
inductor reduces the radiated noise that couples into the traces of the circuit board. Further, the package
layout is optimized to reduce the electrical path length for the AC ripple currents that are a major source of
radiated emissions from DC-DC converters. The integrated inductor significantly reduces parasitic effects that
can harm loop stability, and makes layout very simple.
Stable Over Wide Range of Operating Conditions
The EP5388QI utilizes an internal type III compensation network and is designed to provide a high degree of
stability over a wide range of operating conditions. The device operates over the entire input and output
voltage range with no external modifications required. The very high switching frequency allows for a very
wide control loop bandwidth.
Soft Start
Internal soft start circuits limit in-rush current when the device starts up from a power down condition or when
the “ENABLE” pin is asserted “high”. Digital control circuitry limits the VOUT ramp rate to levels that are safe for
the Power MOSFETS and the integrated inductor.
The EP5388QI has two soft start operating modes. When VOUT is programmed using a preset voltage in VID
mode, the device has a constant slew rate. When the EP5388QI is configured in external resistor divider mode,
the device has a constant VOUT ramp time. Output voltage slew rate and ramp time is given in the Electrical
Characteristics Table.
02377 January,18, 2019 Rev H