EP5348UI datasheet(7/12 Pages) ENPIRION

7 / 12 page

05721

September 12, 2012

Rev: C

EP5348UI

www.enpirion.com

Detailed Description

Functional Overview

The EP5348UI requires only 2 small MLCC

capacitors and a few small-signal components

for a complete DC-DC converter solution. The

device integrates MOSFET switches, PWM

controller,

Gate-drive,

part

the

loop

compensation, and inductor into a tiny 2.0mm x

1.75mm

0.9mm

micro-QFN

package.

Advanced package design, along with the high

level of integration, provides very low output

ripple and noise. The EP5348UI uses voltage

mode control for high noise immunity and load

matching to advanced ≤90nm loads.

external resistor divider is used to program

output setting over the 0.6V to VIN-VDROPOUT as

specified in the Electrical Characteristics Table.

The EP5348UI provides the industry’s highest

power density of any 400mA DC-DC converter

solution.

The

key

enabler

this

revolutionary

integration is Enpirion’s proprietary power

MOSFET technology. The advanced MOSFET

switches are implemented in deep-submicron

CMOS to supply very low switching loss at high

switching frequencies and to allow a high level

of integration. The semiconductor process

allows seamless integration of all switching,

control, and compensation circuitry.

The proprietary magnetics design provides

high-density/high-value magnetics in a very

small footprint.

Enpirion magnetics are

carefully

matched

the

control

and

compensation circuitry yielding an optimal

solution with assured performance 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 Inductor

The EP5348UI utilizes a proprietary low loss

integrated inductor.

The integration of the

inductor greatly simplifies the power supply

design process. The inherent shielding and

compact construction of the integrated inductor

reduces the noise that can couple into the

traces of the printed circuit board. Further, the

package layout is optimized to reduce the

electrical path length for the high di/dT currents

that are always present in DC-DC converters.

The integrated inductor provides the optimal

solution to the complexity, output ripple, and

noise that plague low power DC-DC converter

design.

Control Matched to sub 90nm Loads

The EP5348UI utilizes a type III compensation

network. Voltage mode control is inherently

impedance matched to the sub 90nm process

technology that is used in today’s advanced

ICs. Voltage mode control also provides a high

degree of noise immunity at light load currents

so that low ripple and high accuracy are

maintained over the entire load range. The

very high switching frequency allows for a very

wide control loop bandwidth and hence

excellent transient performance.

Soft Start

Internal soft start circuits limit the rate of output

voltage rise when the device starts up from a

power down condition, or when the “ENABLE”

pin is asserted “high”. Digital control circuitry

controls the VOUT rise time to ensure a smooth

turn-on ramp.

The EP5348UI has a fixed VOUT turn-on time.

Therefore, the ramp rate will vary with the

output voltage setting. Output voltage rise time

is given in the Electrical Characteristics Table.

Excess bulk capacitance on the output of the

device can cause an over-current condition at

startup. The maximum total capacitance on

the output, including the output filter capacitor,

and bulk and decoupling capacitance at the

load, is given as:

COUT_TOTAL_MAX = 9.333 x 10-4 / VOUT

The nominal value for the output filter capacitor

is 10uF. See the applications section for more

details.

Over Current/Short Circuit Protection

The current limit function is achieved by

sensing the current flowing through a sense P-

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