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L9788 Datasheet(PDF) 64 Page - STMicroelectronics

Part # L9788
Description  Multifunction IC for automotive engine management system
PDF  264 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9788 Datasheet(HTML) 64 Page - STMicroelectronics

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Multi-voltage regulator supplies
L9788
64/264
DS12308 Rev 4
Figure 24. Power supply block diagram with charge pump and MRD without pre-boost
6.1
Pre-boost regulator
The boost regulator will provide a higher voltage than battery to the buck regulator when
battery voltage is too low to maintain 5 V regulator out of reset conditions. Once the output
of the pre-boost is higher than VB_IN_th (typ 8.5 V), the pre-boost will stop working.
The boost is disabled at the beginning of the power down sequence. When Boost_EN
(CONFIG_REG 1 D5) = 0 the internal driver keeps OFF the external MOS.
The parameters of Pre-boost regulator can be guaranteed when Vbat goes down to 3.0 V
during cranking phase. The block diagram of the pre-boost is Figure 25.
Figure 25. Pre-boost block diagram
GADG2911161247PS
VB_IN_SW
Vpre
C_BST
BUCK_C_BST
VB_STBY
WK
VBAT
CP
VB_IN
Charge Pump
Vtrack 1/2/3
Track Regulator
Buck
U-chip power structure
5V
6V
WK_IN
KEY
Supply
Internal
Linear
5V Regulator
GADG2911161323PS
VBAT
Vpre
Inside chip
Boost_G
L_Boost
SW
D1_Boost
VB_IN
Output voltage sense
Rg_pd
Rg
Q1_Boost
PWM
AND
ADC buffer
VB_sense
Logic
Duty cycle control
Enable
Vth
Boost_En
stage
driver
Boost



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