LP3991TL-1.8EV National Semiconductor, LP3991TL-1.8EV Datasheet

LP3991TL-1.8EV

Manufacturer Part Number

LP3991TL-1.8EV

Description

BOARD EVALUATION LP3991TL-1.8

Manufacturer

National Semiconductor

Series

PowerWise®r

Datasheets

1.LP3991TL-1.2EV.pdf (4 pages)

2.LP3991TL-1.2EV.pdf (12 pages)

Specifications of LP3991TL-1.8EV

Channels Per Ic

1 - Single

Voltage - Output

1.8V

Current - Output

300mA

Voltage - Input

1.65 ~ 4V

Regulator Type

Positive Fixed

Operating Temperature

-40°C ~ 85°C

Board Type

Fully Populated

Utilized Ic / Part

LP3991

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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LP3991TL micro SMD

Evaluation Board

Information

Introduction

This board is designed to allow the evaluation of the LP3991

Low Voltage CMOS Regulator. Each board is pre-assembled

and tested in the factory. The board contains the LP3991 in

a 4 bump micro SMD package and input and output capaci-

tors connected to GND . The LP3991 is capable of operating

with an input voltage as low as 1.65V for output voltage op-

tions of 1.5V or less. The LP3991 can supply a maximum

output current of 300mA and is particularly suitable for pow-

ering digital circuits, where good transient behavior is re-

quired. It can be employed in applications requiring post

regulation of switching regulators to provide maximum effi-

ciency in battery powered products.

Operation

The input voltage, applied between V

at least 0.5V above the output voltage with a minimum of

Schematic Diagram

and GND should be

201707

Evaluation Board Schematic

National Semiconductor

Application Note 1416

Morgan Bryce

February 2007

1.65V and a maximum of 3.3V. For output voltages of 1.5V or

higher, the LP3991 will operate with an input voltage of only

0.2V above V

PSSR and transient behavior can be expected when operat-

ing the device with such a low V

connections should be kept reasonably short (<300mm) to

minimize input inductance and ensure optimum transient per-

formance. If longer leads are used, then it may be required to

increase the input capacitor value to 2.2µF or 4.7µF.

ON/OFF control of the LP3991 is provided on the evaluation

board by a logic signal applied to the V

0.95V is required to guarantee the device to be on and the

device will be shutdown with V

ON/OFF control is not required, the V

to V

(R1) for this purpose.

A load may be connected from the V

The schematic and board layout are shown below:

. The evaluation board has provision for an optional link

OUT

. However, some loss in performance of

to V

OUT

set to 0.4V or less. If

20170701

pin can be connected

OUT

pin to GND.

pin. A minimum of

difference. Input

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Related parts for LP3991TL-1.8EV

LP3991TL-1.8EV Summary of contents

Page 1

... LP3991TL micro SMD Evaluation Board Information Introduction This board is designed to allow the evaluation of the LP3991 Low Voltage CMOS Regulator. Each board is pre-assembled and tested in the factory. The board contains the LP3991 bump micro SMD package and input and output capaci- tors connected to GND . The LP3991 is capable of operating with an input voltage as low as 1 ...

Page 2

PCB Layout Bill of Materials for LP3991 Micro SMD Evaluation Board Item Value U1 LP3991SD-X.X C 1.0µ 4.7µF OUT 0Ω R1 Test Pins www.national.com Evaluation Board Component and Pin Layout Board Size:- 1.200" X 1.000" Qty Footprint 1 ...

Page 3

Notes 3 www.national.com ...

Page 4

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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