05721

September 12, 2012

Rev: C

EP5348UI

400mA Synchronous Buck Regulator

with Integrated Inductor

RoHS Compliant; Halogen Free

www.enpirion.com

Description

The EP5348UI delivers the optimal trade-off

between footprint and efficiency. It is a perfect

alternative to replace less efficient LDOs in space

constrained applications that require improved

efficiency.

The EP5348UI is a 400mA PowerSoC which

integrates

MOSFET

switches,

control,

compensation, and the magnetics in a micro-

QFN Package. This highly integrated DCDC

solution offers up to 46-points better efficiency

than the comparable LDO.

A significant

reduction in power loss and improved thermals

are achieved. It enables extended battery life

and helps Meet Energy Star requirements.

Integrated magnetics enables a tiny solution

footprint, low output ripple, and high reliability,

while maintaining high efficiency. The complete

solution size is similar to an LDO and much

smaller than a comparable DCDC.

Features

• Integrated Inductor Technology

• 400mA continuous output current

• 2.0mm x 1.75mm x 0.9mm uQFN package

• Small Solution Footprint

• Efficiency, up to 90%

• Short circuit and over current protection

• UVLO and thermal protection

• IC level reliability in a PowerSoC solution

Applications

• Applications where poor LDO efficiency

creates:

o

Thermal challenges

o

Battery Life challenges

o

Failure to meet Energy Star

requirements

• Space-constrained applications

• Portable media players and USB peripherals

EP5348

10µF

0603

VOUT

PVIN

AGND

ENABLE

AVIN

PGND

VFB

2.2µF

0603

0.1µF

Figure 1: Typical Application Schematic

15

25

35

45

55

65

75

85

95

0.0

0.1

0.2

0.3

Load Current (A)

EP5348UI

LDO

Δ = 46-points

VIN = 5.0V

VOUT = 1.2V