L4949DR2G datasheet(8/10 Pages) ONSEMI

Part #	L4949DR2G

Description	100 mA, 5.0 V, Low Dropout Voltage Regulator with Power?뭀n Reset

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Manufacturer	ONSEMI [ON Semiconductor]

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8 / 10 page

L4949, NCV4949

http://onsemi.com

8

Reset Circuit

The block circuit diagram of the reset circuit is shown in

Figure 16.

The reset circuit supervises the output voltage. The reset

threshold of 4.5 V is defined with the internal reference

voltage and standby output divider.

The reset pulse delay time tRD, is defined with the charge

time of an external capacitor CT:

t

RD +

C

T

x2.0 V

2.0

mA

The reaction time of the reset circuit originates from the

discharge time limitation of the reset capacitor CT and is

proportional to the value of CT. The reaction time of the reset

circuit increases the noise immunity.

1.23 V Vref

22 k

Out

Reg

2.0

mA

CT

2.0 V

+

−

Reset

Figure 16. Reset Circuit

Standby output voltage drops below the reset threshold

only a bit longer than the reaction time results in a shorter

reset delay time.

The nominal reset delay time will be generated for

standby output voltage drops longer than approximately

50

ms. The typical reset output waveforms are shown in

Figure 17.

VRT + 0.1 V

5.0 V

UKT

Vout

3.0 V

Reset

Vout1

Vin

40 V

t

tR

tRD

tRR

Switch On

Input Drop

Dump

Output

Overload

Switch Off

Figure 17. Typical Reset Output Waveforms

Sense Comparator

The sense comparator compares an input signal with an

internal voltage reference of typical 1.23 V. The use of an

external voltage divider makes this comparator very flexible

in the application.

It can be used to supervise the input voltage either before

or after the protection diode and to give additional

information to the microprocessor like low voltage warnings.

ORDERING INFORMATION

Device

Operating Temperature Range

Package

Shipping†

L4949N

TJ = −40°C to +125°C

PDIP−8

50 Units / Rail

L4949NG

PDIP−8

(Pb−Free)

50 Units / Rail

L4949D

SOIC−8

98 Units / Rail

L4949DG

SOIC−8

(Pb−Free)

98 Units / Rail

L4949DR2

SOIC−8

2500 Units / Tape & Reel

L4949DR2G

SOIC−8

(Pb−Free)

2500 Units / Tape & Reel

NCV4949DG*

SOIC−8

(Pb−Free)

98 Units / Rail

NCV4949DR2*

SOIC−8

2500 Units / Tape & Reel

NCV4949DR2G*

SOIC−8

(Pb−Free)

2500 Units / Tape & Reel

NCV4949DWR2*

SOIC−20W

1000 Units / Tape & Reel

NCV4949DWR2G*

SOIC−20W

(Pb−Free)

1000 Units / 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.

*NCV4949: Tlow = −40°C, Thigh = +125°C. Guaranteed by design.

NCV prefix is for automotive and other applications requiring site and change control.

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L4949DR2G Datasheet(PDF) 8 Page - ON Semiconductor

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