EN5312QI
Detailed Description
Protection features include under-voltage lock-
out (UVLO), over-current protection (OCP),
short circuit protection, and thermal overload
protection.
Functional Overview
The EN5312QI is a complete DCDC converter
solution requiring only two low cost MLCC
Integrated Inductor
capacitors.
MOSFET switches, PWM
controller, Gate-drive, compensation, and
inductor are integrated into the tiny 5mm x
4mm 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 high
switching frequency. The high switching
frequency allows for a wide control loop
Altera has introduced the world’s first product
family featuring integrated inductors. 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 DCDC
bandwidth
providing
excellent
transient
performance. The high switching frequency
enables the use of very small components
making possible this unprecedented level of
integration.
converters.
The
integrated
inductor
significantly reduces parasitic effects that can
harm loop stability, and makes layout very
simple.
Altera’s Enpirion 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
very wide control loop bandwidth. Unique
magnetic design allows for integration of the
inductor into the very low profile 1.1mm
package. Integration of the inductor virtually
eliminates the design/layout issues normally
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.
associated
with
switch-mode
DCDC
converters. All of this enables much easier
and faster integration into various applications
to meet demanding EMI requirements.
The EN5312QI operates in a constant slew
rate when the output voltage is programmed
with an internal VID code. The EN5312QI,
when in external resistor divider mode, has a
constant start up time. Please refer to the
Electrical Characteristics table for soft-start
slew rates and soft-start time
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 the 0.6V to VIN-
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.
Excess bulk capacitance on the output of the
device can cause an over-current condition at
startup. Assuming no-load at startup, the
maximum total capacitance on the output,
including the output filter capacitor, bulk and
decoupling capacitance, at the load, is given
as:
7
www.altera.com/enpirion
04535
December 14, 2015
Rev E
ALTERA [ ALTERA CORPORATION ]
