L4979D-E Datasheet L4979DTR-E, L4979MD, L4979D013TR | P7-P9

L4979D, L4979MD Electrical specifications

Doc ID 10262 Rev 9 7/22

2 Electrical specifications

2.1 Absolute maximum ratings

Stressing the device above the ratings listed in Tabl e 3 may cause permanent damage to

the device. These are stress ratings only and operation of the device at these or any other

conditions above those indicated in the operating sections of this specification is not implied.

Exposure to the conditions reported in this section for extended periods may affect device

reliability. Refer also to the STMicroelectronics SURE program and other relevant quality

documents.

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

V

vsdc

DC supply voltage -0.3 to 40 V

I

vsdc

Input current Internally limited

V

vo

DC output voltage -0.3 to 6

(1)

1. Using the typical application schematic with Cout= 10 µF and Iout=0 A, when the regulator is switched-on,

an overshoot exceeding 6 V could occur.This behavior does not impact the reliability of the regulator.

V

I

vo

DC output current Internally limited

V

wi

Watchdog input voltage -0.3 to V

vo

+0.3 V

V

od

Open drain output voltage (RES) -0.3 to V

vo

+0.3 V

I

od

Open drain output current (RES) Internally limited

V

cr

Reset delay voltage -0.3 to V

vo

+0.3 V

V

cw

Watchdog delay voltage -0.3 to V

vo

+0.3 V

V

en

Enable input voltage -0.3 to 40 V

T

j

Junction temperature -40 to 150 °C

V

ESD

ESD voltage level (HBM-MIL STD 883C) ±2 kV

Table 4. Thermal data

Symbol Parameter SO8 SO16+2+2 Unit

R

th j-amb

Thermal resistance junction to ambient 130 to 180 50 to 80 °C/W

Electrical specifications L4979D, L4979MD

8/22 Doc ID 10262 Rev 9

2.2 Electrical characteristics

V

s

= 5.6 V to 31 V; T

j

= -40 °C to 150 °C, unless otherwise specified.

Table 5. General

Pin Symbol Parameter Test condition Min. Typ. Max. Unit

V

s

, V

o

I

q

Quiescent current

V

s

= 13.5 V, I

o

=150mA,

enable high all

I/O currents = 0

1.5 3 mA

V

s

, V

o

I

q

Quiescent current

V

s

= 13.5 V, I

o

=0mA,

enable high all

I/O currents = 0

100 200 µA

V

s

, V

o

I

q

Quiescent current

V

s

= 13.5 V, I

o

=0mA,

enable low all

I/O currents = 0

6 20 µA

T

w

Thermal protection

temperature

150 190 °C

T

w_hy

Thermal protection

temperature

hysteresis

10 °C

Table 6. Voltage regulator

Pin Symbol Parameter Test condition Min. Typ. Max. Unit

V

o

V

o_ref

Output voltage

V

s

= 5.6 to 31 V;

I

o

= 1 to 150 mA

4.90 5.00 5.10 V

V

o

I

short

Output short circuit

current

(1)

1. See Figure 3: Behavior of output current versus regulated voltage V

o

.

V

s

= 13.5 V 150 280 400 mA

V

o

I

lim

Output current

limitation

(1)

V

s

= 13.5 V 150 320 500 mA

V

s

, V

o

V

line

Line regulation voltage

V

s

= 5.6 to 31 V

I

o

= 1 to 150 mA

25 mV

V

o

V

load

Load regulation voltage I

o

= 1 to 150 mA 25 mV

V

s

, V

o

V

dp

Drop voltage I

o

= 150 mA 200 400 mV

V

s

, V

o

SVR Ripple rejection

(2)

2. Guaranteed by design.

f

r

= 100 Hz 55 dB

Table 7. Reset

Pin Symbol Parameter Test condition Min. Typ. Max. Unit

R

es

V

res_l

Reset output low

voltage

R

ext

=5k to V

o

;

V

o

>1V

0.4 V

R

es

I

res_h

Reset output high

leakage current

V

res

=5V 1 µA

L4979D, L4979MD Electrical specifications

Doc ID 10262 Rev 9 9/22

R

es

R

_p_u

Internal pull-up

resistance

With respect to V

o

12 25 50 k

R

es

V

o_th

Reset threshold voltage

V

s

= 5.6 to 31 V

I

o

= 1 to 150 mA

6%

below

V

o_ref

8%

below

V

o_ref

10%

below

V

o_ref

V

cr

V

rhth

Reset timing high

threshold

V

s

= 13.5 V

44%

V

o_ref

47%

V

o_ref

50%

V

o_ref

V

cr

V

rlth

Reset timing low

threshold

V

s

= 13.5 V

10%

V

o_ref

13%

V

o_ref

16%

V

o_ref

V

cr

I

cr

Charge current V

s

= 13.5 V 8 17 30 µA

V

cr

I

dr

Discharge current V

s

= 13.5 V 8 17 30 µA

R

es

t

rr_2

Reset delay time

(1)

V

o

=V

o_th

- 100 mV 100 250 700 µs

R

es

t

rd

Reset pulse delay V

s

= 13.5 V; C

tr

= 1 nF 65 150 ms

1. When V

o

becomes lower than 4 V, the reset reaction time decreases down to 2 µs assuring a faster reset

condition in this particular case.

Table 8. Watchdog

Pin Symbol Parameter Test condition Min. Typ. Max. Unit

W

i

V

ih

Input high voltage V

s

= 13.5 V 3.5 V

W

i

V

il

Input low voltage V

s

= 13.5 V 1.5 V

W

i

V

ih

Input hysteresis V

s

= 13.5 V 300 mV

W

i

I

i

Pull down current V

s

= 13.5 V 10 20 µA

V

cw

V

whth

High threshold V

s

= 13.5 V 2.20 2.35 2.50 V

V

cw

V

wlth

Low threshold V

s

= 13.5 V 0.50 0.65 0.80 V

V

cw

I

cwc

Charge current V

s

= 13.5 V; V

cw

= 0.1 V 4 7.5 14 µA

V

cw

I

cwd

Discharge current V

s

= 13.5 V; V

cw

= 2.5 V 1.0 2.4 4.5 µA

V

cw

T

wop

Watchdog period

V

s

= 13.5 V;

C

tw

=47nF

25 50 90 ms

R

es

t

wol

Watchdog output low

time

V

s

= 13.5 V;

C

tw

=47nF

6 10 22 ms

Table 9. Enable

Pin Symbol Parameter Test condition Min. Typ. Max. Unit

E

n

V

en_l

Enable input low voltage 1 V

E

n

V

en_h

Enable input high

voltage

3 V

E

n

V

en_hy

Enable input hysteresis 700 1000 1100 mV

E

n

I

_leak

Pull down current E

n

= 5 V 2 10 20 µA

Table 7. Reset (continued)

Pin Symbol Parameter Test condition Min. Typ. Max. Unit

L4979D-E

L4979D-E

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