EP5358LUI datasheet(9/14 Pages) ENPIRION

9 / 14 page

03541

5/29/2009

Rev:A

EP5358LUI/EP5358HUI

www.enpirion.com

Detailed Description

Functional Overview

The EP5358xUI requires only 2 small MLCC

capacitors for a complete DC-DC converter

solution.

The device integrates MOSFET

switches,

PWM

controller,

Gate-drive,

compensation, and inductor into a tiny 3mm x

3mm x 1.1mm micro-QFN package. Advanced

package design, along with the high level of

integration, provides very low output ripple and

noise.

The EP5358xUI uses voltage mode

control for high noise immunity and load

matching to advanced ≤90nm loads. A 3-pin

VID allows the user to choose from one of 8

output voltage settings.

The EP5358xUI

comes with two VID output voltage ranges.

The EP5358HUI provides VOUT settings from

1.8V to 3.3V, the EP5358LUI provides VID

settings from 0.8V to 1.5V, and also has an

external resistor divider option to program

output setting over the 0.6V to VIN-0.25V

range. The EP5358xUI provides the industry’s

highest power density of any 500mA DCDC

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 seem-less 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: Low-Noise Low-EMI

The EP5358xUI 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 conducted and radiated 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 input AC ripple currents that

are a major source of radiated emissions from

DC-DC converters.

The integrated inductor

provides the optimal solution to the complexity,

output ripple, and noise that plague low power

DCDC converter design.

Control Matched to sub 90nm Loads

The EP5358xUI utilizes an integrated 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 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 EP5358HUI has a soft-start slew rate that

is twice that of the EP5358LUI.

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:

EP5358LUI:

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