L4989

4/10

Note: 1. see fig1 (behavior of output current versus regulated voltage Vo)

RESET

2. When Vo becomes lower than 4V, the reset reaction time decreases down to 2 s assuring a faster reset condition in this particular

case.

Vs, Vo

Current consumption

with watchdog not active

Vs=13.5V,

Io=10mA,

WEn low

127

300

µA

Vs, Vo

Current consumption

with watchdog not active

Vs=13.5V, Io=50mA,

WEn low

498

900

µA

Vs, Vo

Current consumption

with watchdog not active

Vs=13.5V, Io=150mA,

WEn low

1.40

2

mA

Vs, Vo

Current consumption

with watchdog active

Vs=13.5V, Io<1mA,

WEn high

110

170

µA

Vs, Vo

Current consumption

with watchdog active

Vs=13.5V,

Io=10mA,

WEn high

168

350

µA

Vs, Vo

Current consumption

with watchdog active

Vs=13.5V,

Io=50mA,

WEn high

538

1000

µA

Vs, Vo

Current consumption

with watchdog active

Vs=13.5V,

Io=150mA,

WEn high

1.45

2.00

mA

Tw

Thermal protection temperature

150

190

°C

Tw_hy

Thermal protection temperature

hysteresis

10

°C

Pin

Symbol

Parameter

Test condition

min

typ

max

Unit

Res

Vres_l

Reset output low voltage

Rext = 5k

Ω to Vo,

Vo > 1V

0.4

V

Res

Reset output high leakage

current

1

µA

Res

Internal Pull up resistance

versus Vo

10

20

40

k

Ω

Res

Vo_th

Reset threshold voltage

Vs = 5.6 to 31V Io = 1 to

150mA

6%

8%

10%

below

Vcr

Vrhth

Reset timing low threshold

Vs =13.5V

10%

13%

16%

Vcr

Vrlth

Reset timing high threshold

Vs =13.5V

44%

47%

50%

Vcr

Icr

Charge current

Vs =13.5V

8

15

30

µA

Vcr

Idr

Discharge current

Vs =13.5V

8

15

30

µA

Res

trr_2

Reset reaction time (2)

100

250

700

µs

Res

trd

Reset delay time

Vs =13.5V, Ctr =1nF

65

115

165

ms

Pin

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit