L9396 datasheet(33/109 Pages) STMICROELECTRONICS

33 / 109 page

DS12539 Rev 6

33/109

L9396

Power supply

108

3.9

VCC regulator

This regulator provides a dedicated rail to supply µC I/Os. It can be configured via VCCSEL

pin to output either 3.3 V or 5 V. The VCC regulator has over and under voltage detections

and is also protected against short to ground and over temperature with shared thermal

sensor with VCC5.

The state of VCCSEL pin is latched at power up when VPREREG voltage exceeds the

VPREREG_UV threshold and stays latched until next POR event.

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

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

tsoftstart

Softstart time

From 10% to 90%

of nominal output

voltage

345

1035

µs

TJSDVCCx

Thermal Shutdown

175

200

°C

THYS_TSDVCCx

Thermal Shutdown

hysteresis

-5

°C

Table 13. VCC5 regulator electrical characteristics (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Table 14. VCC regulator electrical characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VCC_L

Regulated output

voltage

0mA ≤ IVCC ≤ 100mA;

VCCSEL = ‘0’

3.220

3.3

3.380

VCC_H

Regulated output

voltage

VPREREG ≥ 6V, 0mA

≤ IVCC ≤ 100mA;

VCCSEL = ‘1’

4.88

5.12

VCCSEL_IH

VCCSEL input high

voltage

-1.75

VCCSEL_IL

VCCSEL input low

voltage

0.75

VCCSEL_Ihys

VCCSEL input

hysteresis

100

1000

Ipd_VCCSEL

VCCSEL input Pull

down current

VCCSEL=3.3V

µA

VCC_UV

Undervoltage

threshold

VCC_x

- 10%

VCC_x -

VCC_OV

Overvoltage threshold

VCC_x

+ 5%

VCC_x +

10%

tflt_VCC_UVOV

Under/overvoltage

filter time

µs

IVCC

Output load current

100

CVCC

Output capacitor

2.2

4.7

µF

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