NCP551 데이터 시트보기 (PDF) - ON Semiconductor

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NCP551

150 mA CMOS Low Iq Low−Dropout Voltage Regulator

ON Semiconductor 

Input

Q1

R

1

1.0 mF

2

3

NCP551, NCV551

Input

R1

Q1

R2

Q2

R3

Output

5

1

1.0 mF

1.0 mF

2

4

3

Output

5

1.0 mF

4

Figure 21. Current Boost Regulator

The NCP551 series can be current boosted with a PNP transis-

tor. Resistor R in conjunction with VBE of the PNP determines

when the pass transistor begins conducting; this circuit is not

short circuit proof. Input/Output differential voltage minimum is

increased by VBE of the pass resistor.

Figure 22. Current Boost Regulator with

Short Circuit Limit

Short circuit current limit is essentially set by the VBE of Q2 and

R1. ISC = ((VBEQ2 − ib * R2) / R1) + IO(max) Regulator

Input

Enable

1

1.0 mF

2

3

Output

5

1.0 mF

4

1

1.0 mF

2

3

R

C

Output

5

1.0 mF

4

Figure 23. Delayed Turn−on

If a delayed turn−on is needed during power up of several volt-

ages then the above schematic can be used. Resistor R, and

capacitor C, will delay the turn−on of the bottom regulator.

Input

R

Q1

1.0 mF

11 V

Output

1

5

1.0 mF

2

3

4

Figure 24. Input Voltages Greater than 12 V

A regulated output can be achieved with input voltages that

exceed the 12 V maximum rating of the NCP551 series with

the addition of a simple pre−regulator circuit. Care must be

taken to prevent Q1 from overheating when the regulated

output (Vout) is shorted to GND.

ORDERING INFORMATION

Device

Nominal

Output Voltage

Marking

Package

Shipping†

NCP551SN15T1

1.5

LAO

TSOP−5

3000 / Tape & Reel

NCP551SN15T1G

1.5

LAO

TSOP−5

(Pb−Free)

3000 / Tape & Reel

NCP551SN18T1

1.8

LAP

TSOP−5

3000 / Tape & Reel

NCP551SN18T1G

1.8

LAP

TSOP−5

(Pb−Free)

3000 / Tape & Reel

NCP551SN25T1

2.5

LAQ

TSOP−5

3000 / Tape & Reel

NCP551SN25T1G

2.5

LAQ

TSOP−5

(Pb−Free)

3000 / Tape & Reel

NCP551SN27T1

2.7

LAR

TSOP−5

3000 / Tape & Reel

NCP551SN27T1G

2.7

LAR

TSOP−5

(Pb−Free)

3000 / Tape & Reel

NOTE: 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 Specifi-

cations Brochure, BRD8011/D.

6. NCV551 is qualified for automotive use.

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