TSH690

3/14

ELECTRICAL DC CHARACTERISTICS

Tamb = 25°C, V

TSH690 DISSIPATION CONSIDERATIONS

In order to respect the dissipation limitation of the

package, you should consider the following equa-

tion:

with:

R

T

T

The respect of this condition forms a safe area on

the following figure:

Figure 1 : Dissipation capability vs T ambient

If VBIAS is DC connected to VCC, the operating

temperature can be directly determined without

determining ICC, thanks to the direct reading

curve:

In applications using a duty cycle, the average dis-

sipation is less than in continuous mode. The fol-

lowing figure gives the relation beetween the dis-

sipated power and the duty cycle.

Figure 3 : Dissipation vs Duty cycle

Parameter

Min.

Typ.

Max.

Unit

Supply Current

Vcc = 2V

Vcc = 2.7V

Vcc = 3V

Vcc = 4V

Vcc = 5V

33

29

46

53

79

105

mA

Rth-(j-a): Junction Ambient Thermal Resistance for SO-8 Package

140

180

°C/W

T

-40 -30 -20 -10 0

102030 40 5060708090

0

100

200

300

400

500

600

700

800

900

SAFE

AREA

V

BIAS

= V

CC

R

TH

= 180°C/W

T

AMB

(°C)

01

23456

0

20

40

60

80

100

120

140

160

SAFE

AREA

V

BIAS

=V

CC

R

THmax

=180°C/W

V

CC

(V)

0

102030405060

708090

100

0

100

200

300

400

500

600

700

800

900

V

CC

= 5V

V

CC

= 4V

V

CC

= 3V

V

CC

= 2V

Pd = V

CC

x I

CC

x Duty Cycle

Duty Cycle(%)