L9788TR datasheet(70/264 Pages) STMICROELECTRONICS

70 / 264 page

Multi-voltage regulator supplies

L9788

70/264

DS12308 Rev 4

ILIMVPRE

Current limit

2.4

3.5

VPRE

VPRE_coupling

VPRE capacitive

coupling during

battery transients

VB_IN_SW from 0 to

13 V in 100 µs,

C = 40 µF, L = 22 µH,

device off



Design info, not tested

VPRE

Vuv_vpre_h

VPRE under

voltage hysteresis

threshold high;

VPRE voltage at

Power up to allow

Boost activation

threshold

Test condition:

VB_IN_SW = 5.4 V

4.38

4.65

VPRE

Vuv_vpre_l

VPRE under

voltage hysteresis

threshold low

Test condition:

VB_IN_SW = 5.4 V

4.25

4.51

VPRE

Tuv_filter_vpre

VPRE under

voltage filter time (2)

10.1

13.3

VPRE

VPRE_slope

Slope control

VB_IN_SW = 13 V

V/ms

VPRE

Tmsd_VPRE_H

Thermal

shutdown_High

Comparator threshold

and functionality are

tested in production

185

200

°C

VPRE

Tmsd_VPRE_L

Thermal

shutdown_Low

Comparator threshold

and functionality are

tested in production

175

190

°C

VPRE

Tmsd_hyst

Thermal hysteresis

for shutdown

°C

VPRE

tmsd_pre_an

Thermal shutdown

analog filter time

1.5

VPRE

tmsd_pre_dig

Thermal shutdown

digital filter time

VPRE

VPRE_rpd

VPRE pulldown

resistor

To keep VPRE below

10 V with Buck switch

leakage in OFF state

0.2

1.05

MΩ

VPRE

Fsw_VPRE

Switching

frequency

Fosc from main 15 MHz

oscillator, typical

462.5 kHz

450

Fosc/32

500

kHz

BUCK_SW

DCVPRE(BUCK) Duty cycle range

100%

BUCK_SW

Table 29. Pre-buck regulator output electrical characteristics (continued)

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

L9788TR Datasheet(PDF) 70 Page - STMicroelectronics

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