LP38513S-1.8EV National Semiconductor, LP38513S-1.8EV Datasheet

LP38513S-1.8EV

Manufacturer Part Number

LP38513S-1.8EV

Description

BOARD EVAL LP38513 1.8V

Manufacturer

National Semiconductor

Datasheets

1.LP38513S-1.8EV.pdf (8 pages)

2.LP38513S-1.8EV.pdf (14 pages)

Specifications of LP38513S-1.8EV

Channels Per Ic

1 - Single

Voltage - Output

1.8V

Current - Output

Voltage - Input

2.25 ~ 5.5V

Regulator Type

Positive Fixed

Operating Temperature

-40°C ~ 125°C

Board Type

Fully Populated

Utilized Ic / Part

LP38513

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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LP38513S-1.8 Evaluation

Board

Introduction

This board is designed to enable the evaluation of the

LP38513S-1.8 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 LP38513 is a linear regulator capable of supplying up to

3A of output current, and incorporates Enable and Error flag

features.

The device has been designed to work with 10 µF ceramic

input and output capacitors. Footprints areas for C

Operation

The input voltage, applied between V

at least 2.25V, and no higher than 5.5V.

Loads can be connected to V

Test points are provided on the board to allow monitoring of

If the application does not require the Enable function, the EN

pin should be connected to directly to the adjacent V

Enable Operation

The Enable On/Off threshold is typically 850 mV, and has no

hysteresis. The voltage signal must rise and fall cleanly, and

promptly, through this threshold.

The Enable pin (EN) has no internal pull-up or pull-down to

establish a default condition and, as a result, this pin must be

terminated either actively or passively.

If the Enable pin is driven from a single ended device (such

as the collector of a discrete transistor) a pull-up resistor to

OUT

, or a pull-down resistor to ground, will be required for

, V

will allow for a variety of sizes.

, Enable, and ERROR signals during operation

FIGURE 1. V

OUT

with reference to GND.

vs. V

and GND, should be

202046

20204610

pin.

and

National Semiconductor

Application Note 1518

Don Jones

August 2007

proper operation. A 1 kΩ to 100 kΩ resistor can be used as

the pull-up or pull-down resistor to establish default condition

for the EN pin. The resistor value selected should be appro-

priate to swamp out any leakage in the external single ended

device, as well as any stray capacitance.

If the Enable pin is driven from a source that actively pulls high

and low (such as a CMOS rail to rail comparator output), the

pull-up, or pull-down, resistor is not required.

If the application does not require the Enable function, the EN

pin should be connected to directly to the adjacent V

The status of the Enable pin also affects the behavior of the

ERROR Flag. While the Enable pin is high the regulator con-

trol loop will be active and the ERROR Flag will report the

status of the output voltage. When the Enable pin is taken low

the regulator control loop is shutdown, the output is turned off,

and the internal logic will immediately force the ERROR Flag

pin low.

ERROR Flag

When the LP38513 Enable pin is high, the ERROR Flag pin

will produce a logic low signal when the output drops by more

than 10% (typical) from the nominal output voltage. The drop

in output voltage may be due to low input voltage, current

limiting, or thermal limiting. This flag has a built in hysteresis.

The output voltage will need to rise to within 5% of the nominal

output voltage for the ERROR Flag to return to a logic high

state. It should also be noted that when the Enable pin is

pulled low, the ERROR Flag pin is forced to be low as well.

The internal ERROR flag comparator has an open drain out-

put stage. Hence, the ERROR pin requires an external pull-

up resistor. The value of the pull-up resistor should be in the

range of 2 kΩ to 100 kΩ, and should be connected to the

LP38513 output voltage pin. The ERROR Flag pin should not

be pulled-up to any voltage source higher than V

flow through an internal parasitic diode may cause unexpect-

ed behavior. When the input voltage is less than typically

FIGURE 2. Enable Threshold

www.national.com

20204603

as current

pin.

Related parts for LP38513S-1.8EV

LP38513S-1.8EV Summary of contents

Page 1

... LP38513S-1.8 Evaluation Board Introduction This board is designed to enable the evaluation of the LP38513S-1.8 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 LP38513 is a linear regulator capable of supplying output current, and incorporates Enable and Error flag features. The device has been designed to work with 10 µ ...

Page 2

... With the 30°C/W thermal rating the LP38513S-1.8 evaluation board will deliver the rated 3A output current if V ≤ 1.8V, and T 25° ...

Page 3

FIGURE 5. ERROR Flag when Pull-Up is from V 3 20204607 IN www.national.com ...

Page 4

Connection Diagram Schematic Diagram www.national.com 20204604 Evaluation Board Schematic 4 20204601 ...

Page 5

PCB Layout Evaluation Board Component and Pin Layout 5 20204609 www.national.com ...

Page 6

... Terminal ; Blue Resistor: 10 kΩ ±1%; 0805 Resistor: 10 kΩ ±1%; 0805 Not Installed Turret Terminal : Mounting Hole Diameter = 0.062” 6 Manufacturer Part Number LP38513S-1.8 NOPB Corporation AVX 1210ZC106KAT2A AXV 1210ZC106KAT2A 108–0901–001 108–0902–001 Johnson Components 108–0903–001 108– ...

Page 7

Notes 7 www.national.com ...

Page 8

... 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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