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NCP5666

3.0 A, Low Dropout Linear Regulator with Enable

Unspecified 

NCP5666

APPLICATION INFORMATION

The NCP5666 is a high performance low dropout 3.0 A

linear regulator with Enable suitable for high power

applications. It is thermally robust and includes the safety

features necessary during a fault condition, which provide

for an attractive high current LDO solution for server, ASIC

power supplies, networking equipment applications, and

many others.

Input Capacitor

An input bypass capacitor is recommended to improve

transient response or if the regulator is located more than a

few inches from the power source. This will reduce the

circuit's sensitivity to the input line impedance at high

frequencies and significantly enhance the output transient

response. Different types and different sizes of input

capacitors can be chosen dependent on the quality of power

supply. The range of 4.7 mF to 220 mF should cover most of

the applications. The higher the capacitance, the lower

change of input voltage due to line and load transients. The

bypass capacitor should be mounted with shortest possible

lead or track length directly across the regulator's input

terminals.

Output Capacitor

The output capacitor is required for stability. The

NCP5666 remains stable with ceramic, tantalum, and

aluminum electrolytic capacitors with a minimum value of

2.2 mF. See Figure 12 for stable region of ESR for various

output capacitors. The range of 2.2 mF to 220 mF should

cover most of the applications. The higher the capacitance,

the better load transient response. When a high value

capacitor is used, a low value capacitor is also recommended

to be put in parallel. The output capacitors should be placed

as close as possible to the output pin of the device. This

should help ensure ultrafast transient response times.

Current Limit Operation

As the peak output current increases beyond its limitation,

the device is internally clampled to 4.5 A, thus causing the

output voltage to decrease and go out of regulation. This

allows the device never to exceed the maximum power

dissipation.

Input Voltage Operating Range

The NCP5666 is guaranteed to protect itself from self

destruction due to excessive power dissipation by activating

current limit and thermal shutdown protections. These

destructive situations can happen during very fast startup

with large output capacitors or when output is short

circuited. As long as the input voltage is lower than

maximum operating voltage (9 V), the maximum power

dissipation is never exceeded.

If input voltage is between maximum operating voltage

(9 V) and absolute maximum voltage (18 V) power

dissipation must never exceed limits specified in Thermal

Consideration section for safety operation.

To use the device over maximum operating voltage the

slow startup, not large output capacitors and no short circuit

is recommended to maintain.

Thermal Consideration

The maximum device power dissipation can be calculated by:

TJ(max) * TA

PD +

RqJA

The bipolar process employed for this IC is fully

characterized and rated for reliable 18 V operation. To avoid

damaging the part or degrading it's reliability, power

dissipation transients should be limited to 30 W for D2PAK.

For open-circuit to short-circuit transient,

PDTransient = Vin(operating max) * ISC

ORDERING INFORMATION

Device

Nominal Output Voltage

Package

Shipping†

NCP5666DS25R4G (Note 7)

2.5 V

D2PAK

(Pb-Free)

800 / Tape & Reel

NCP5666DS50R4G (Note 7)

5.0 V

D2PAK

(Pb-Free)

800 / Tape & Reel

7. Other fixed output voltages available at 0.9 V, 1.2 V, 1.5 V, 1.8 V, 3.0 V, 3.3 V per request.

†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

8

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