NCP699

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7

APPLICATIONS INFORMATION

A typical application circuit for the NCP699 series is

shown in Figure 1, front page.

A 1.0

mF capacitor either ceramic or tantalum is

recommended and should be connected close to the NCP699

package. Higher values and lower ESR will improve the

overall line transient response.

TDK capacitor: C2012X5R1C105K, or C1608X5R1A105K

The NCP699 is a stable regulator and does not require any

specific Equivalent Series Resistance (ESR) or a minimum

output current. Capacitors exhibiting ESRs ranging from a

few m

W up to 5.0 W can thus safely be used. The minimum

decoupling value is 1.0

mF and can be augmented to fulfill

stringent load transient requirements. The regulator accepts

ceramic chip capacitors as well as tantalum capacitors.

Larger values improve noise rejection and load regulation

transient response.

TDK capacitor: C2012X5R1C105K, C1608X5R1A105K,

or C3216X7R1C105K

Enable Operation

The enable pin will turn on the regulator when pulled high

and turn off the regulator when pulled low. These limits of

threshold are covered in the electrical specification section

of this data sheet. If the enable is not used then the pin should

Hints

Please be sure the Vin and Gnd lines are sufficiently wide.

When the impedance of these lines is high, there is a chance

to pick up noise or cause the regulator to malfunction.

Set external components, especially the output capacitor,

as close as possible to the circuit, and make leads as short as

possible.

Thermal

As power across the NCP699 increases, it might become

necessary to provide some thermal relief. The maximum

power dissipation supported by the device is dependent

upon board design and layout. Mounting pad configuration

on the PCB, the board material and also the ambient

temperature effect the rate of temperature rise for the part.

This is stating that when the NCP699 has good thermal

conductivity through the PCB, the junction temperature will

be relatively low with high power dissipation applications.

The maximum dissipation the package can handle is

given by:

PD +

TJ(max) *TA

RqJA

If junction temperature is not allowed above the

maximum 125

°C, then the NCP699 can dissipate up to

400 mW @ 25

°C.

The power dissipated by the NCP699 can be calculated

from the following equation:

Ptot + Vin *Ignd (@Iout) ) [Vin * Vout] *Iout

or

VinMAX +

Ptot ) Vout * Iout

Ignd(@Iout) ) Iout

If an 150 mA output current is needed then the ground

current from the data sheet is 40

mA. For an NCP699 (3.0 V),

the maximum input voltage will then be 5.65 V.

ORDERING INFORMATION

Device

Nominal

Output Voltage*

Marking

Package

NCP699SN13T1G

1.3

LJY

TSOP−5

(Pb−Free)

3000 Units/

7″ Tape & Reel

NCP699SN14T1G

1.4

AA4

NCP699SN15T1G

1.5

LJP

NCP699SN18T1G

1.8

LJS

NCP699SN25T1G

2.5

LJT

NCP699SN28T1G

2.8

LJU

NCP699SN29T1G

2.9

ACP

NCP699SN30T1G

3.0

LJV

NCP699SN31T1G

3.1

AAE

NCP699SN33T1G

3.3

LJW

NCP699SN34T1G

3.4

ACF

NCP699SN45T1G

4.5

ACQ

NCP699SN50T1G

5.0

LJX

*Additional voltages in 100 mV steps are available upon request by contacting your ON Semiconductor representative.

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specification Brochure, BRD8011/D.