SABRE-LL-I datasheet(36/141 Pages) STMICROELECTRONICS

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Linear main regulator

SABRE-LL-I

36/141

power externally (the power dissipated by a linear driver supplied at VSupply and regulating a

voltage VLINmain_OUT with an output current IOUT is about: Pd= (VSupply-VLINmain_OUT)*IOUT.

Figure 8.

Linear main regulator external bipolar example

Whichever configuration is used (regulator or controller), a ceramic capacitor must be

connected on the output pin towards ground to guarantee the stability of the regulator; the

value of this capacitance is in the range of 100nF to 1µF depending on the regulated

voltage.

When this regulator is disabled, the whole circuit is switched off and the current

consumption is reduced to a very low level both from V3v3 and from VSupply. When in this

condition, the output pin is pulled low by an internal switch.

Table 17.

System linear regulator operating specifications

Parameter

Description

Test condition

Min

Typ

Max

Unit

VLINmain_OUT

Output pin

voltage range

(1)

0VSupply

Vdrop

Drop out voltage

Vdrop=

Vsupply-VLINmain_OUT

IPD

Internal switch pull

down current

Linear Main Regulator

disabled;

VLINmain_OUT=1V

3mA

VLINmain_FB

Feedback pin voltage

range

03.6

VLINmain_Ref

Feedback reference

voltage

0.776

0.8

0.824

ILINmain_Ref

Feedback pin input

current

-2

µA

VLINmain_Ref

Body Diode

Cload

VLINmain_FB

Vsupply

VLINmain_OUT

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