LP38512TS-1.8EV National Semiconductor, LP38512TS-1.8EV Datasheet

LP38512TS-1.8EV

Manufacturer Part Number

LP38512TS-1.8EV

Description

BOARD EVAL FOR LP38512TS-1.8

Manufacturer

National Semiconductor

Datasheets

1.LP38512TS-1.8EV.pdf (14 pages)

2.LP38512TS-1.8EV.pdf (6 pages)

Specifications of LP38512TS-1.8EV

Channels Per Ic

1 - Single

Voltage - Output

1.8V

Current - Output

1.5A

Voltage - Input

2.25 ~ 5.5V

Regulator Type

Positive Fixed

Operating Temperature

-40°C ~ 125°C

Board Type

Fully Populated

Utilized Ic / Part

LP38512

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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LP38512TS-1.8 Evaluation

Board

Introduction

This board is designed to enable the evaluation of the

LP38512TS-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 LP38512 is a linear regulator capable of supplying up to

1.5A 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 threshold is typically 1.2V, and typically has

200mV of hysteresis. The voltage signal should rise and fall

cleanly, and promptly, through these thresholds.

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

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

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

300283

30028310

pin.

and

National Semiconductor

Application Note 1676

Don Jones

November 5, 2007

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 LP38512 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

LP38512 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

1.25V the status of the ERROR flag output will not be reliable.

FIGURE 2. Enable Threshold

www.national.com

30028303

as current

pin.

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LP38512TS-1.8EV Summary of contents

Page 1

... LP38512TS-1.8 Evaluation Board Introduction This board is designed to enable the evaluation of the LP38512TS-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 LP38512 is a linear regulator capable of supplying up to 1.5A of output current, and incorporates Enable and Error flag features. The device has been designed to work with 10 µ ...

Page 2

... Although there is only approximately 0.28 square inches of copper area immediately under the tab, the top copper sur- face area is extended to additional copper area on the bottom of the board by nine thermal vias. With the 30°C/W thermal rating the LP38512TS evaluation board will deliver the rated 3A output current if V ≤ 1.8V, and T 25° ...

Page 3

Connection Diagram Schematic Diagram PCB Layout Evaluation Board Schematic Evaluation Board Component and Pin Layout 3 30028304 30028301 30028311 www.national.com ...

Page 4

... Terminal ; Blue Resistor: 10 kΩ ±1%; 0805 Resistor: 10 kΩ ±1%; 0805 Not Installed Turret Terminal : Mounting Hole Diameter = 0.062” 4 Manufacturer Part Number LP38512TS-1.8 NOPB Corporation AVX 1210ZC106KAT2A AXV 1210ZC106KAT2A 108–0901–001 108–0902–001 Johnson Components 108–0903–001 108– ...

Page 5

Notes 5 www.national.com ...

Page 6

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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