Datasheet L4949N, L4949DR2, L4949D Datasheet (MOTOROLA)

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The L4949 is a monolithic integrated 5.0 V voltage regulator with a very low dropout and additional functions such as power–on reset and input voltage sense.

It is designed for supplying the micro–computer controlled systems especially in automotive applications.

• Operating DC Supply Voltage Range 5.0 V to 28 V

• Transient Supply Voltage Up to 40 V

• Extremely Low Quiescent Current in Standby Mode

• High Precision Standby Output Voltage 5.0 V ±1%

• Output Current Capability Up to 100 mA

• Very Low Dropout Voltage Less Than 0.4 V

• Reset Circuit Sensing The Output Voltage

• Programmable Reset Pulse Delay With External Capacitor

• Voltage Sense Comparator

• Thermal Shutdown and Short Circuit Protections

MULTIFUNCTION

VERY LOW DROPOUT

VOLTAGE REGULATOR

SILICON MONOLITHIC INTEGRATED CIRCUIT

8

1

N SUFFIX

PLASTIC PACKAGE

CASE 626

8

1

Supply

Voltage (VCC)

Sense

Input

(Si)

1

V

s

2

Representative Block Diagram

Output

Preregulator

6.0 V

Regulator

1.23 V

Voltage (V

V

38 4

Z

ref

out

2.0

Reset

Gnd

5

)

µ

A

C

T

Sense

+

2.0 V

–

+

1.23 V

–

Reset

6

Sense Output (So)

7

D SUFFIX

PLASTIC PACKAGE

CASE 751

PIN CONNECTIONS

V

1

CC

S

2

i

V

3

Z

C

4

T

(Top View)

8

7 6

5

V

out

S

o

Reset

Gnd

ORDERING INFORMATION

Operating

Device

L4949N L4949D

 Motorola, Inc. 1998 Rev 1

Temperature Range

TJ = –40° to +125°C

Package

DIP–8

SO–8

ABSOLUTE MAXIMUM RATINGS

ÁÁÁ

which damage to the device may occur.)

Rating

DC Operating Supply Voltage Transient Supply Voltage (t < 1.0 s) Output Current

Output Voltage Sense Input Current Sense Input Voltage Output Voltages

Reset Output Sense Output

Output Currents

Reset Output

Sense Output Preregulator Output Voltage Preregulator Output Current ESD Protection at any pin

Human Body Model

Machine Model Thermal Resistance, Junction–to–Air

P Suffix, DIP–8 Plastic Package, Case 626

D Suffix, SO–8 Plastic Package, Case 751 Maximim Junction Temperature Storage Temperature Range

NOTE: ESD data available upon request.

L4949

(Absolute Maximum Ratings indicate limits beyond

Symbol Value Unit

V

VCC

I

out

V

I

V

Reset

V

I

Reset

I

SO

V

R

θJA

T

CC

out SI

SI

SO

Z

I

Z

– –

J

stg

TR

28 40

Internally

Limited

20 ±1.0 V

CC

20

5.0

7.0

5.0

2000

400

100 200

150

–65 to +150

mA

°C/W

V V –

V

– V

V

°C °C

ELECTRICAL CHARACTERISTICS (V

= 14 V, –40°C < TJ < 125°C, unless otherwise specified.)

CC

Characteristic

Output Voltage (TJ = 25°C, I Output Voltage (6.0 V < VCC < 28 V, 1.0 mA < I Output Voltage (VCC = 35 V, t < 1.0 s, 1.0 mA < I

= 1.0 mA)

out

< 50 mA)

out

< 50 mA)

Dropout Voltage

I

= 10 mA

out

I

= 50 mA

out

I

= 100 mA

out

Input to Output Voltage Difference in Undervoltage Condition

(VCC = 4.0 V, I Line Regulation (6.0 V < VCC < 28 V, I Load Regulation (1.0 mA < I

= 35 mA)

out

< 100 mA)

out

= 1.0 mA)

out

Current Limit

V

= 4.5 V

out

V

= 0 V

out

Quiescent Current (I

БББББББББББББББББ

Quiescent Current (I

БББББББББББББББББ

= 0.3 mA, TJ < 100°C)

out

= 100 mA)

out

Symbol Min Typ Max Unit

V

out

V

out

V

out

V

drop

V

IO

Reg

line

Reg

load

I

Lim

I

QSE

ÁÁÁ

I

Q

ÁÁÁ

4.95

4.9

– – –

–

– –

105

–

ÁÁ–ÁÁ

ÁÁ–ÁÁ–ÁÁ

5.0

0.1

0.2

0.3

0.2

1.0

8.0

200 100

150

5.05

5.1

0.25

0.40

0.50

0.4

20 30

400

–

260

ÁÁ

5.0

ÁÁ

V V V V

V

mV mV mA

µA

mA

2

MOTOROLA ANALOG IC DEVICE DATA

L4949

ÁÁÁ

ÁÁÁ ÁÁÁ

ÁÁÁ

ÁÁÁ ÁÁÁ

ÁÁÁ

ELECTRICAL CHARACTERISTICS (continued) (V

= 14 V, –40°C < TJ < 125°C, unless otherwise specified.)

CC

Characteristic UnitMaxTypMinSymbol

RESET

Reset Threshold Voltage Reset Threshold Hysteresis

@ TJ = 25°C

@ TJ = –40 to +125°C Reset Pulse Delay (CT = 100 nF, tR ≥ 100 µs)

БББББББББББББББББ

Reset Reaction Time (CT = 100 nF)

БББББББББББББББББ

Reset Output Low Voltage (R

БББББББББББББББББ

Reset Output High Leakage Current (V

БББББББББББББББББ

Delay Comparator Threshold

БББББББББББББББББ

Delay Comparator Threshold Hysteresis

БББББББББББББББББ

Reset

= 10 kΩ to V

= 5.0 V)

Reset

, VCC ≥ 3.0 V)

out

SENSE

Sense Low Threshold (VSI Decreasing = 1.5 V to 1.0 V) Sense Threshold Hysteresis Sense Output Low Voltage

(VSI ≤ 1.16 V , VCC ≥ 3.0 V, RSO = 10 kΩ to V

out

) Sense Output Leakage (VSO = 5.0 V, VSI ≥ 1.5 V) Sense Input Current

PREREGULAT OR

Preregulator Output Voltage (IZ = 10 µA)

V

Resth

V

Resth,hys

t

ResD

ÁÁÁ

t

ResR

ÁÁÁ

V

ResL

ÁÁÁ

I

ResH

ÁÁÁ

V

CTth

ÁÁÁ

V

CTth, hys

ÁÁÁ

V

SOth

V

SOth,hys

V

SOL

I

SOH

I

SI

V

Z

–

V

– 0.5

out

50 50

ÁÁ55ÁÁ

ÁÁ–ÁÁ

ÁÁ–ÁÁ–ÁÁ

ÁÁ–ÁÁ

1.16 20

–

–1.0

–

100

–

100

5.0

2.0

100

1.23 100

–

0.1

6.3

–

200 300

180

ÁÁ

30

ÁÁ

0.4

1.0 –

ÁÁ

–

ÁÁ

1.35 200

0.4

1.0

–

V

mV

ms

ÁÁ

µs

ÁÁ

V

ÁÁ

µA

ÁÁ

V

ÁÁ

mV

ÁÁ

V

mV

V

µA µA

V

ÁÁ

1 2 3 4 5 6 7 8

5.04

5.02

5.0

, OUTPUT VOL TAGE (V)

4.98

out

V

Symbol

ÁÁÁÁ

V

CC

S

i

V

Z

C

T

Gnd Reset S

O

V

out

ББББББББББББББББББББББББ

Supply Voltage Input of Sense Comparator Output of Preregulator Reset Delay Capacitor Ground Output of Reset Comparator Output of Sense Comparator Main Regulator Output

TYPICAL CHARACTERIZA TION CUR VES

Figure 1. Output Voltage versus

Junction T emperature

VCC = 14 V I

= 1.0 mA

out

PIN FUNCTION DESCRIPTION

Description

6.0

5.0

4.0

3.0

2.0

, OUTPUT VOL TAGE (V)

out

V

1.0

Figure 2. Output Voltage versus

Supply V oltage

TJ = 25°C

RL = 5.0 k

RL = 100

Ω

4.96 –40 –20 0 40 6020 100 120

TJ, JUNCTION TEMPERATURE (

80

°

C)

MOTOROLA ANALOG IC DEVICE DATA

0

010

1.0

2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 V

, SUPPLY VOLT AGE (V)

CC

3

L4949

TYPICAL CHARACTERIZA TION CUR VES (continued)

Figure 3. Dropout Voltage versus

Output Current

250

TJ = 25°C

200

150

100

, DROPOUT VOLTAGE (mV)

50

drop

V

0

0.1 100 I

, OUTPUT CURRENT (mA)

out

101.0

Figure 5. Quiescent Current versus

Output Current

3.0 VCC = 14 V

2.5

TJ = 25

°

C

Figure 4. Dropout Voltage versus

Junction T emperature

0.40

I

= 100 mA

0.30

0.20

, DROPOUT VOLTAGE (mV)

0.10

drop

V

0 –40 –20 0 40 6020 100 120

TJ, JUNCTION TEMPERATURE (

out

I

out

I

out

= 50 mA

= 10 mA

80

°

C)

Figure 6. Quiescent Current versus

Supply V oltage

3.0

2.5

TJ = 25°C

2.0

1.5

1.0

, QUIESCENT CURRENT (mA)

Q

0.5

I

0

0.1 1.0 10 100 I

, OUTPUT CURRENT (mA)

out

Figure 7. Reset Output versus

Regulator Output Voltage

6.0 TJ = 25°C

5.0

Resistor 10 k from Reset Output

4.0

to 5.0 V

3.0

, RESET OUTPUT (V)

2.0

Reset

V

1.0

0

4.0 4.1

4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 V

, OUTPUT VOLTAGE (V)

out

2.0

RL = 100

1.5

1.0

, QUIESCENT CURRENT (mA)

Q

0.5

I

0

0 5.0 10 15 20 25 30

VCC, SUPPLY VOLT AGE (V)

Ω

RL = 5.0 k

Figure 8. Reset Thresholds versus

Junction T emperature

4.7

4.66

4.62

4.58

4.54

4.5

, RESET THRESHOLD VOLTAGE (V)

4.46

Reset

V

4.42

Upper Threshold

Lower Threshold

–40 –20

0 20 40 60 80 100 120

TJ, JUNCTION TEMPERATURE (

°

C)

4

MOTOROLA ANALOG IC DEVICE DATA

L4949

TYPICAL CHARACTERIZA TION CUR VES (continued)

Figure 9. Sense Output versus

Sense Input V oltage

6.0

TJ = 25°C

5.0

4.0

Resistor 10 k from Sense Output to 5.0 V

3.0

2.0

, SENSE OUTPUT VOL TAGE (V)

1.0

SO

V

0

1.0 1.15

1.11.05

1.2 1.25 1.3 1.35 1.4 1.45 1.5

VSI, SENSE INPUT VOLTAGE (V)

APPLICATION INFORMATION

Supply V oltage Transient

High supply voltage transients can cause a reset output signal perturbation. For supply voltages greater than 8.0 V the circuit shows a high immunity of the reset output against supply transients of more than 100 V/µs. For supply voltages

Figure 10. Sense Thresholds versus

Junction T emperature

1.4

1.38

1.36

1.34

1.32

1.3

1.28

, SENSE INPUT VOLTAGE (V)

1.24

SI

V

1.22

1.2

Upper Threshold

Lower Threshold1.26

–40 –20

0 20 40 60 80 100 120

°

TJ, JUNCTION TEMPERATURE (

C)

less than 8.0 V supply transients of more than 0.4 V/µs can cause a reset signal perturbation. To improve the transient behavior for supply voltages less than 8.0 V a capacitor at Pin 3 can be used. A capacitor at Pin 3 (C3 ≤ 1.0 µF) reduces also the output noise.

Figure 11. Application Schematic

V

out

Reset

C

2.0

O

C

T

µ

A

Sense

+ –

6

2.0 V

RSO10 k

7

1.23 V

10 k

Ω

V

Ω

Reset

out

S

o

C3

V

Z

(optional)

V

bat

V

CC

1

C

s

S

i

2

Preregulator

Regulator

V

CC

1.23 V

6.0 V

ref

38 4

NOTES: 1. For stability: Cs ≥ 1.0 µF, CO ≥ 4.7 µF, ESR < 10 Ω at 10 kHz

2. Recommended for application: Cs = CO = 10 µF

MOTOROLA ANALOG IC DEVICE DATA

5

Gnd

5

L4949

OPERA TING DESCRIPTION

The L4949 is a monolithic integrated low dropout voltage regulator. Several outstanding features and auxiliary functions are implemented to meet the requirements of supplying microprocessor systems in automotive applications. Nevertheless, it is suitable also in other applications where the present functions are required. The modular approach of this device allows the use of other features and functions independently when required.

V oltage Regulator

The voltage regulator uses an isolated Collector Vertical PNP transistor as a regulating element. With this structure, very low dropout voltage at currents up to 100 mA is obtained. The dropout operation of the standby regulator is maintained down to 3.0 V input supply voltage. The output voltage is regulated up to the transient input supply voltage of 35 V. With this feature no functional interruption due to overvoltage pulses is generated.

The typical curve showing the standby output voltage as a function of the input supply voltage is shown in Figure 13.

The current consumption of the device (quiescent current) is less than 200 µA.

To reduce the quiescent current peak in the undervoltage region and to improve the transient response in this region, the dropout voltage is controlled. The quiescent current as a function of the supply input voltage is shown in Figure 14.

Short Circuit Protection:

The maximum output current is internally limited. In case of short circuit, the output current is foldback current limited as described in Figure 12.

Figure 13. Output V oltage versus Supply Voltage

V

out

V

5.0 V

out

V

CC

Figure 14. Quiescent Current versus Supply V oltage

3.0

2.5

2.0

1.5

1.0

, QUIESCENT CURRENT (mA)

Q

0.5

I

TJ = 25°C

RL = 100

RL = 5.0 k

Ω

35 V5.0 V2.0 V0 V

Figure 12. Foldback Characteristic of V

10

(V)

5.0

out

V

0

20 100 200

I

(mA)

out

0

0 5.0 10 15 20 25 30

VCC, SUPPLY VOLT AGE (V)

Preregulator

T o improve the transient immunity a preregulator stabilizes the internal supply voltage to 6.0 V. This internal voltage is present at Pin 3 (VZ). This voltage should not be used as an output because the output capability is very small (≤ 100 µA).

This output may be used as an option when better transient behavior for supply voltages less than 8.0 V is required. In this case a capacitor (100 nF – 1.0 µF) must be connected between Pin 3 and Gnd. If this feature is not used Pin 3 must be left open.

6

MOTOROLA ANALOG IC DEVICE DATA

Reset Circuit

The block circuit diagram of the reset circuit is shown in

Figure 15.

The reset circuit supervises the output voltage. The reset thereshold of 4.5 V is defined with the internal reference voltage and standby output drivider.

The reset pulse delay time tRD, is defined with the charge time of an external capacitor CT:

CTx2.0V

tRD+

2.0mA

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 .

Figure 15. Reset Circuit

1.23 V V

ref

2.0

µ

Out

Reg

22 k

A

C

T

+

2.0 V

–

Reset

L4949

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 µs. The typical reset output waveforms are shown in Figure 16.

Figure 16. T ypical Reset Output Waveforms

t

RD

40 V

t

R

Output

Overload

V

out

5.0 V

VRT + 0.1 V

UKT

3.0 V

Reset

V

in

V

out1

t

RD

t

RR

Switch On Input Drop Dump

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.

t

Switch Off

MOTOROLA ANALOG IC DEVICE DATA

7

NOTE 2

–T–

SEATING PLANE

H

A

E

B

C

A1

58

–B–

14

F

–A–

C

N

D

G

0.13 (0.005) B

M

D

58

0.25MB

1

H

4

e

A

B

SS

A0.25MCB

L4949

OUTLINE DIMENSIONS

N SUFFIX

PLASTIC PACKAGE

CASE 626–05

ISSUE K

L

J

K

T

SEATING PLANE

0.10

A

M

D SUFFIX

PLASTIC PACKAGE

CASE 751–05

ISSUE S

M

h

X 45

_

q

STYLE 1:

PIN 1. AC IN

2. DC + IN

3. DC – IN

4. AC IN

5. GROUND

6. OUTPUT

7. AUXILIARY

8. V

C

L

CC

NOTES:

1. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL.

2. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS).

3. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.

DIM MIN MAX MIN MAX

A 9.40 10.16 0.370 0.400 B 6.10 6.60 0.240 0.260 C 3.94 4.45 0.155 0.175 D 0.38 0.51 0.015 0.020 F 1.02 1.78 0.040 0.070 G 2.54 BSC 0.100 BSC H 0.76 1.27 0.030 0.050 J 0.20 0.30 0.008 0.012 K 2.92 3.43 0.115 0.135 L 7.62 BSC 0.300 BSC M ––– 10 ––– 10 N 0.76 1.01 0.030 0.040

NOTES:

1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994.

2. DIMENSIONS ARE IN MILLIMETERS.

3. DIMENSION D AND E DO NOT INCLUDE MOLD PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.

5. DIMENSION B DOES NOT INCLUDE MOLD PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION.

MILLIMETERS

DIM MIN MAX

A 1.35 1.75

A1 0.10 0.25

B 0.35 0.49 C 0.18 0.25 D 4.80 5.00 E

3.80 4.00

1.27 BSCe

H 5.80 6.20 h

0.25 0.50

L 0.40 1.25

0 7

q

INCHESMILLIMETERS

__

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty , representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “T ypical” parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.

Mfax is a trademark of Motorola, Inc.

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8

◊

MOTOROLA ANALOG IC DEVICE DATA

L4949/D