L9396 datasheet(32/109 Pages) STMICROELECTRONICS

32 / 109 page

Power supply

L9396

32/109

DS12539 Rev 10

3.8

VCC5 regulator

This regulator provides a fixed 5V rail to supply µC I/Os and ADC. The VCC5 regulator has

over and under voltage detections and is also protected against short circuits and over

temperature with shared thermal sensor with VCC regulator.

All electrical characteristics are valid for the following conditions unless otherwise noted:

-40 °C ≤ Tj ≤ +175 °C; VPREREG_L(Min) ≤ VPREREG ≤ VPREREG_H(Max).

tflt_oc_vcore

Shut down filter

time for short to

ground

Filter time starts to

count from when

current in power

MOS is more than

ICOREL Ilimx

100

115

µs

tflt_restart

restart filter time for

short to ground

Filter time starts to

count from when

core buck is

disabled

1.7

2.3

PSRR

Power supply

rejection ratio

VPREREG = 6.5V,

Vnoise = 1Vpp

fnoise = 20 kHz,

CVCORE = 22µF

LVCORE = 22µH

Table 12. VCORE regulator electrical characteristics (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Table 13. VCC5 regulator electrical characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VCC5

Regulated output

voltage

0mA ≤ IVCC5 ≤

250mA

4.88

5.12

VCC5_UV

Undervoltage threshold -

VCC5 -

10%

VCC5 -

VCC5_OV

Overvoltage threshold

VCC5 +

10%

tflt_VCC5_UVOV

Under/overvoltage filter

time

µs

IVCC5

Output load current

250

CVCC5

Output capacitor

2.2

4.7

µF

CVCC5 ESR

Output capacitor ESR

0.01

0.1

Ω

dVSR_ac

Line Transient

Response

All line, load;

dt = 10 µs

-5%

dVLR_ac

Load Transient

Response

All line, load;

dt = 10 µs

-5%

RDSon

High side Rds_ON

Ω

VCC5_cur lim

Current limitation

300

600

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