L9788 datasheet(67/264 Pages) STMICROELECTRONICS

67 / 264 page

DS12308 Rev 4

67/264

L9788

Multi-voltage regulator supplies

263

Boost application information table:

R3_VBAT_sense

Resistor

divider string

element

Design info, not tested

18.15

36.3

54.45

kΩ

R4_VBAT_sense

Resistor

divider string

element

Design info, not tested

12.5

37.5

kΩ

R5_VBAT_sense

Resistor

divider string

element

Design info, not tested

67.5

135

202.5

kΩ

Table 27. Pre-boost regulator output electrical characteristics (continued)

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

Table 28. Pre-boost regulator external components electrical characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

COUT_BOOST

Capacitance at

VB_IN

150

µF

Min 4*10 µF,



10%,25 V, X7R, 1206,



CER CAP;

VB_IN

COUT_BOOST_ALU

Option ALU

Capacitance at

VB_IN

330

470

µF

ALU 35 V ESR 10 mΩ--3 Ω¸



330 µF, 20%, 25 V,

SMD,AL,ELEC CAP

VB_IN

VBoost_ripple

1.2

1.1

1.0

0.8

Vpp

triangular ripple @ 10 kHz

and 25 kHz @ 50 kHz @

100 kHz @ 350 kHz. All

characteristics of all blocks

supplied by VB_IN

guaranteed

VB_IN

IBOOST

Load current at

VB_IN

0.05

1.8

VB_IN

Q1_Boost

Choice: STD20NF06L

VB_IN

D1_Boost

Choice: STPS10H100C

VB_IN

L_boost

BOOST

inductance

0.8

1.2

µH

ESR = 10 mΩ

VB_IN

L_boost1

BOOST

inductance

2.5

µH

ESR = 25 mΩ, Isat = 23 A

VB_IN

L_boost1

BOOST

inductance

3.3

µH

VB_IN

Rsense

Resistor for

VB_sense pin

protection

kΩ

VBAT_Sense

2.2

BOOST_G

Rg_pd

150

kΩ

BOOST_G

L9788 Datasheet(PDF) 67 Page - STMicroelectronics

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