Data Sheet

13

Rev. 1.2, 2009-11-18

TLE4254

Electrical Characteristics

5.3

Adjust / Enable Input

In order to reduce the quiescent current to a minumum, the TLE4254 can be switched to stand-by mode by setting

the adjust/enable input “ADJ/EN” to “low”.

In case the pin “ADJ/EN is left open, an internal pull-down resistors keeps the voltage at the pin low and therefore

ensures that the regulator is switched off.

Table 3

Electrical Characteristics Adjust / Enable

V

all voltages with respect to ground (unless otherwise specified).

Pos.

Parameter

Symbol

Limit Values

Unit

Test Condition

Min.

Typ.

Max.

5.3.16 Adjust / Enable

Low Signal Valid

V

ADJ/EN,low

––0.4

V

V

I

5.3.17 Adjust / Enable

High Signal Valid

(Tracking Region)

V

ADJ/EN,high

2––

V

V

5.3.18 Adjust / Enable

Input Current

I

ADJ/EN

–23

µA

V

5.3.19 Adjust / Enable

Input Current

if Input tied to GND

I

ADJ/EN

–0.3

0.6

mA

V

V

5.3.20 Adjust / Enable

internal pull-down resistor

R

ADJ/EN

1.7

2.5

3.3

M

Ω

Typical Performance Characteristics Adjust / Enable Input

Adjust / Enable Input

Current

I

Adjust / Enable Input

Current

I

Startup Sequence

V

-50

50

100

IADJ-Tj .vsd

2.3

2.2

2.1

2.4

0

150

2.5

0

V

10

30

IADJ _ VI.v s d

10

1

40

I

100

20

T

T

V

VQ-VADJ.vsd

3

2

1

4

V

23

4

1

V

T