03409

September 12, 2012

Rev: D

EP5357LUI/EP5357HUI

©Enpirion 2012 all rights reserved, E&OE

2

www.enpirion.com

Ordering Information

Part Number

Comment

Package

EP5357LUI

LOW VID Range

16-pin QFN T&R

EP5357HUI

HIGH VID Range

16-pin QFN T&R

EP5357LUI-E

EP5357LUI Evaluation Board

EP5357HUI-E

EP5357HUI Evaluation Board

Pin Assignments (Top View)

PVIN

AVIN

ENABLE

VS0

VS1

VS2

NC(SW)

PGND

LLM

VFB

VSENSE

AGND

3

1

4

2

6

5

16

15

78

12

11

13

10

9

14

Figure 3: EP5357LUI Pin Out Diagram (Top View)

PVIN

AVIN

ENABLE

VS0

VS1

VS2

NC(SW)

PGND

LLM

NC

VSENSE

AGND

3

1

4

2

6

5

16

15

78

12

11

13

10

9

14

Figure 4: EP5357HUI Pin Out Diagram (Top View)

Pin Description

PIN

NAME

FUNCTION

1, 15,

16

NC(SW)

NO CONNECT – These pins are internally connected to the common switching node of the

internal MOSFETs. NC (SW) pins are not to be electrically connected to any external signal,

ground, or voltage. However, they must be soldered to the PCB. Failure to follow this

guideline may result in part malfunction or damage to the device.

2

PGND

Power ground. Connect this pin to the ground electrode of the Input and output filter

capacitors.

3

LLM

LLM (Light Load Mode – “LLM”) pin. Logic-High enables automatic LLM/PWM and logic-

low places the device in fixed PWM operation. LLM pin should be connected to ENABLE,

or should be disabled before ENABLE is pulled low.

4

VFB/NC

EP5357LUI: Feed back pin for external divider option.

EP5357HUI: No Connect

5

VSENSE

Sense pin for preset output voltages. Refer to application section for proper configuration.