LP38859-1.2EVAL National Semiconductor, LP38859-1.2EVAL Datasheet

LP38859-1.2EVAL

Manufacturer Part Number

LP38859-1.2EVAL

Description

BOARD EVALUATION LP38859-1.2

Manufacturer

National Semiconductor

Series

PowerWise®r

Datasheets

1.LP38859-1.2EVAL.pdf (14 pages)

2.LP38859-1.2EVAL.pdf (4 pages)

Specifications of LP38859-1.2EVAL

Channels Per Ic

1 - Single

Voltage - Output

1.2V

Current - Output

Voltage - Input

3 ~ 5.5V

Regulator Type

Positive Fixed

Operating Temperature

-40°C ~ 125°C

Board Type

Fully Populated

Utilized Ic / Part

LP38859

Lead Free Status / RoHS Status

Not applicable / Not applicable

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LP38859S-1.2 Evaluation

Board

Introduction

This board is designed to enable the evaluation of the

LP38859 Voltage Regulator. Each board is assembled and

tested in the factory. This evaluation board has the TO-263

5–lead package mounted.

General Description

The LP38859 is a dual-rail LDO linear regulator capable of

supplying up to 3A of output current, and incorporates a

Soft-Start feature.

The device has been designed to work with 10 µF input and

output ceramic capacitors, and 1µF bias capacitors. Foot-

prints areas for C

Operation

The input voltage, applied between V

at least 1.0V greater than V

applied V

The bias voltage, applied between V

above the minimum bias voltage of 3.0V, and no higher than

the maximum of 5.5V.

Loads can be connected to V

accurate measurements directly on the evaluation board,

eliminating any voltage drop on the PCB traces or connect-

ing wires to the load.

The Soft-Start time for V

is adjusted by changing the Soft-Start capacitor (C

device pin one. An internal resistor (r

capacitor (C

considered to be the Soft-Start time.

Schematic Diagram

OUT

and V

BIAS

voltage.

test points are provided on the board to allow

) form an RC circuit. Five RC time constants is

and C

OUT

is an exponential function, and

will allow for a variety of sizes.

OUT

, and no higher than the

with reference to GND.

BIAS

and GND, should be

AN201936

and GND should be

) and the external

Evaluation Board Schematic

) on

National Semiconductor

Application Note 1480

Don Jones

November 2006

The installed soft-start capacitor (C

and the internal r

Hardware

The schematic and layout of the evaluation board are given

below:

Soft-Start Time = 5 x r

FIGURE 1. V

is typically 16 kΩ.

OUT

20193601

vs C

) is 10 nF (0.01 µF),

x C

www.national.com

20193605

Related parts for LP38859-1.2EVAL

LP38859-1.2EVAL Summary of contents

Page 1

... LP38859 Voltage Regulator. Each board is assembled and tested in the factory. This evaluation board has the TO-263 5–lead package mounted. General Description The LP38859 is a dual-rail LDO linear regulator capable of supplying output current, and incorporates a Soft-Start feature. The device has been designed to work with 10 µF input and output ceramic capacitors, and 1µ ...

Page 2

... With the 37˚C/W thermal rating the LP38859S evaluation board will dissipate a maximum of 2.75W with T FIGURE 2. Maximum Power Dissipation vs Ambient Temperature www ...

Page 3

... Not Installed Terminal - RED Terminal - BLACK Johnson Components Terminal - ORANGE Terminal - BLUE Not Installed Not Installed Not Installed Turret Terminal : 3 Part Number LP38859S-1.2 NOPB AVX 1210ZC106KAT2A AXV 0805ZC105KAT2A AVX 1210ZC106KAT2A — — AVX 0805YC103KAT2A — 108–0902–001 108–0903–001 108– ...

Page 4

... National Semiconductor and the National Semiconductor logo are trademarks or 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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