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NCP629

High Performance CMOS LDO Regulator with Enable and Enhanced ESD Protection in Chip Scale Package (CSP)

ON Semiconductor 

NCP629

Noise Decoupling

The NCP629 is a low noise regulator and needs no

external noise reduction capacitor. Unlike other low noise

regulators which require an external capacitor and have slow

startup times, the NCP629 operates without a noise

reduction capacitor, has a typical 15 ms startup delay and

achieves a 50 mVrms overall noise level between 10 Hz and

100 kHz.

Enable Operation

The enable pin will turn the regulator on or off. The

threshold limits are covered in the electrical characteristics

table in this data sheet. The turn-on/turn-off transient

voltage being supplied to the enable pin should exceed a

slew rate of 10 mV/ms to ensure correct operation. If the

enable function is not to be used then the pin should be

connected to Vin.

Thermal

As power in the NCP629 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 the ambient temperature

affect the rate of junction temperature rise for the part. When

the NCP629 has good thermal conductivity through the

PCB, the junction temperature will be relatively low with

high power applications. The maximum dissipation the

NCP629 can handle is given by:

PD(MAX)

+

TJ(MAX) *

RqJA

TA

(eq. 1)

Since TJ is not recommended to exceed 125_C, then the

NCP629 soldered on 645 mm2, 1 oz copper area, FR4 can

dissipate up to 360 mW when the ambient temperature (TA)

is 25_C. See Figure 26 for RthJA versus PCB area.

The power dissipated by the NCP629 can be calculated

from the following equations:

ǒ Ǔ PD [ Vin IGNDĂ@ĂIout ) IoutǒVin * VoutǓ

(eq. 2)

or

Vin(MAX)

[

PD(MAX) ) (Vout

Iout ) IGND

Iout)

(eq. 3)

340

320

300

280

260

240

220

200

0

(1 oz)

(2 oz)

100 200 300 400 500 600 700

PCB COPPER AREA (mm2)

Figure 26. RthJA vs. PCB Copper Area

Hints

Vin and GND printed circuit board traces should be as

wide as possible. When the impedance of these traces is

high, there is a chance to pick up noise or cause the regulator

to malfunction. Place external components, especially the

output capacitor, as close as possible to the NCP629, and

make traces as short as possible.

DEVICE ORDERING INFORMATION

Device

Version

Marking Code

Package

Shipping†

NCP629FC15T2G

1.5 V

AAA

NCP629FC18T2G

1.8 V

AAC

NCP629FC28T2G

2.8 V

AAD

NCP629FC30T2G

3.0 V

AAE

5 Pin Flip-Chip

3000/Tape & Reel

NCP629FC33T2G

3.3 V

AAF

NCP629FC35T2G

3.5 V

AAG

NCP629FC50T2G

5.0 V

AAH

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

Specifications Brochure, BRD8011/D.

http://onsemi.com

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