EP5357LUI datasheet(13/17 Pages) ENPIRION

13 / 17 page

03409

September 12, 2012

Rev: D

EP5357LUI/EP5357HUI

www.enpirion.com

Application Information

VIN

VSENSE

PVIN

VS1

VS2

VS0

μF

4.7

μF

VOUT

AGND

ENABLE

PGND

AVIN

LLM

Figure 9: Application Circuit, EP5357HUI, configured

for LLM Enabled. Note that all control signals should

be connected to AVIN or AGND.

VIN

VSENSE

PVIN

VS1

VS2

VS0

μF

VOUT

AGND

ENABLE

VFB

PGND

AVIN

LLM

Figure 10: Application Circuit, EP5357LUI,

configured for LLM Enabled, showing the VFB

function.

Output Voltage Programming

The EP5357xUI utilizes a 3-pin VID to program

the output voltage value. The VID is available

in two sets of output VID programming ranges.

The VID pins should be connected either to

AVIN or to AGND to avoid noise coupling into

the device.

The “Low” range is optimized for low voltage

applications. It comes with preset VID settings

ranging from 0.80V and 1.5V. This VID set

also has an external divider option.

To specify this VID range, order part number

EP5357LUI.

The “High” VID set provides output voltage

settings ranging from 1.8V to 3.3V.

This

version does not have an external divider

option. To specify this VID range, order part

number EP5357HUI.

Internally, the output of the VID multiplexer

sets the value for the voltage reference DAC,

which in turn is connected to the non-inverting

input of the error amplifier. This allows the use

of a single feedback divider with constant loop

gain and optimum compensation, independent

of the output voltage selected.

NOTE:

The VID pins must not be left floating.

EP5357L Low VID Range Programming

The EP5357LUI is designed to provide a high

degree of flexibility in powering applications

that require low VOUT settings and dynamic

voltage scaling (DVS). The device employs a

3-pin VID architecture that allows the user to

choose one of seven (7) preset output voltage

settings, or the user can select an external

voltage divider option. The VID pin settings

can be changed on the fly to implement glitch-

free voltage scaling.

Table 2: EP5357LUI VID Voltage Select Settings

VS2

VS1

VS0

VOUT

1.50

1.45

1.20

1.15

1.10

1.05

0.8

EXT

Table 2 shows the VS2-VS0 pin logic states for

the EP5357LUI and the associated output

voltage levels.

A logic “1” indicates a

connection to AVIN or to a “high” logic voltage

level.

A logic “0” indicates a connection to

AGND or to a “low” logic voltage level. These

pins can be either hardwired to AVIN or AGND

or alternatively can be driven by standard logic

levels. Logic levels are defined in the electrical

characteristics table. Any level between the

logic high and logic low is indeterminate.

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