NCP436FCT2G datasheet(6/7 Pages) ONSEMI

Part #	NCP436FCT2G

Description	3A Ultra-Small Controlled Load Switch

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NCP436, NCP437

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6

APPLICATION INFORMATION

Power Dissipation

Main contributor in term of junction temperature is the

power dissipation of the power MOSFET. Assuming this,

the power dissipation and the junction temperature in

normal mode can be calculated with the following

equations:

P

D + RDS(on)

I

OUT

2

PD

= Power dissipation (W)

RDS(on)

= Power MOSFET on resistance (

W)

IOUT

= Output current (A)

T

J + RD

RqJA ) TA

TJ

= Junction temperature (

°C)

RqJA

= Package thermal resistance (

°C/W)

TA

= Ambient temperature (

°C)

PCB Recommendations

The NCP437 integrates an up to 3 A rated PMOS FET, and

the PCB design rules must be respected to properly evacuate

the heat out of the silicon. By increasing PCB area,

especially around IN and OUT pins, the RqJA of the package

can be decreased, allowing higher power dissipation.

Routing example: 2 oz, 4 layers with vias across two

internal inners.

Figure 4.

Example of application definition.

T

J * TA + R

qJA

P

D + R

qJA

R

DS(on)

I2

TJ: Junction Temperature.

TA: Ambient Temperature.

Rq = Thermal resistance between IC and air, through PCB.

RDS(on): Intrinsic resistance of the IC MOSFET.

I: Load DC current.

Taking into account of Rq obtain with:

• 1 oz, 2 layers: 100°C/W.

At 3 A, 25

°C ambient temperature, RDS(on 20 mW @ VIN

5 V, the junction temperature will be:

T

J + R

qJA

P

D + 25 ) 0.02

32

100

+ 43° C

Taking into account of Rq obtain with:

• 2 oz, 4 layers: 60°C/W.

At 3 A, 65

°C ambient temperature, RDS(on) 24 mW @ VIN

5 V, the junction temperature will be:

T

J + TA ) R

q

P

D + 65 ) 0.024

32

60

+ 78° C

ORDERING INFORMATION

Device

Marking

Option

Package

Shipping†

NCP437FCT2G

AR

Auto discharge

WLCSP 1 x 1.5 mm

(Pb−Free)

3000 / Tape & Reel

NCP436FCT2G

AQ

Without Auto discharge

WLCSP 1 x 1.5 mm

(Pb−Free)

3000 / Tape & Reel

†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.

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