TLE4699

Reset Function

Data Sheet

23

Rev. 1.0, 2010-11-30

8.2

Electrical Characteristics Reset Function

Electrical Characteristics: Reset Function

V

all voltages with respect to ground, direction of currents as shown in Figure 7 (unless otherwise specified).

Pos.

Parameter

Symbol

Limit Values

Unit

Conditions

Min.

Typ.

Max.

Output Undervoltage Reset Comparator Default Values (Pin RADJ = GND)

8.2.1

Output Undervoltage Reset

Lower Switching Threshold

V

RT,lo

4.6

4.7

4.8

V

V

V

RADJ = GND

8.2.2

Output Undervoltage Reset

Upper Switching Threshold

V

RT,hi

4.7

4.8

4.9

V

V

V

RADJ = GND

8.2.3

Output Undervoltage Reset

Switching Hysteresis

V

RT,hy

60

120

–

mV

V

RADJ = GND.

8.2.4

Output Undervoltage Reset

Headroom

V

RH

250

300

–

mV

Calculated Value:

V

V

I

RADJ = GND

Reset Threshold Adjustment

8.2.5

Reset Adjust

Lower Switching Threshold

V

RADJ,th

1.17

1.195 1.22

V

V

3.2 V

8.2.6

V

RT,range

3.20

–

4.70

V

–

Reset Output RO

8.2.7

Reset Output Low Voltage

V

RO,low

–

0.2

0.4

V

V

1V

R

8.2.8

Reset Output

External Pull-up Resistor

to Q

R

RO,ext

3–

–

k

Ω

V

1V

V

8.2.9

Reset Output

Internal Pull-up Resistor

R

RO

20

30

40

k

Ω

internally connected to Q

Reset Delay Timing

8.2.10

Upper Delay

Switching Threshold

V

DST,hi

–

1.21

–

V

–

8.2.11

Lower Delay

Switching Threshold

V

DST,lo

–

0.30

–

V

–

8.2.12

Delay Capacitor

Charge Current

I

D,ch

–

3.5

–

μA

V

8.2.13

Delay Capacitor

Reset Discharge Current

I

DR,dsch

–

80

–

mA

V

8.2.14

Undervoltage Reset Delay

Time

t

d,100nF

16

23

30

ms

Calculated value;

C

C