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EN5312QI

1A PowerSoC Synchronous Buck Regulator With Integrated Inductor

Altera Corporation 

Detailed Description

Functional Overview

The EN5312QI is a complete DCDC converter

solution requiring only two low cost MLCC

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

bandwidth providing excellent transient

performance. The high switching frequency

enables the use of very small components

making possible this unprecedented level of

integration.

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

associated with switch-mode DCDC

converters. All of this enables much easier

and faster integration 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 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.

EN5312QI

Protection features include under-voltage lock-

out (UVLO), over-current protection (OCP),

short circuit protection, and thermal overload

protection.

Integrated Inductor

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

converters.

The integrated inductor

significantly reduces parasitic effects that can

harm loop stability, and makes layout very

simple.

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 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

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:

04535

7

December 14, 2015

www.altera.com/enpirion

Rev E

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