Data Sheet

15

Rev. 1.2, 2009-11-09

TLE4253

Electrical Characteristics

5.3

Adjust / Enable Input

In order to reduce the quiescent current to a minimum, the TLE4253 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 resistor keeps the voltage at the pin low and therefore

ensures that the regulator is switched off.

Typical Performance Characteristics Tracking Regulator

V

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.

5.3.1

Adjust / Enable

Low Signal Valid

V

ADJ/EN,low

––0.4

V

V

I

T

5.3.2

Adjust / Enable

High Signal Valid

(Tracking Region)

V

ADJ/EN,high

2––

V

V

|

V

I

5.3.3

Adjust / Enable

Input Current

I

ADJ/EN

–3.8

5.5

µA

V

5.3.4

Adjust / Enable

internal pull-down resistor

R

ADJ/EN

11.5

2

M

Ω

Startup Sequence

0

20

60 80

120 140

4253_startup.vsd

3

2

1

4

40

100

V

ADJ

d

V

(

I

Overshoot depends on

load current, C