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L9788 Datasheet(PDF) 71 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) 71 Page - STMicroelectronics

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DS12308 Rev 4
71/264
L9788
Multi-voltage regulator supplies
263
Note:
When 18 < VB_IN_SW< VOV_VB_IN_L, the function of Vpre is guaranteed and no reset
happens.
RVPRE
VPRE (Buck_POW
ER MOS) transistor
RDSON
-
-
-
200
mOhm BUCK_SW
TRVPRE
Rise Time (10-90%) BUCK_SLOW_SR=0
5
-
25
ns
BUCK_SW
TRVPRE_slow
Rise Time (10-90%) BUCK_SLOW_SR=1
10
-
30
ns
BUCK_SW
TFVPRE
Fall Time (10-90%) Iload = 1 A
5
-
27
ns
BUCK_SW
VPRE_SW_Ileak Leakage current
From 0 V to max pin
voltage
-
-
1
μA
BUCK_SW
1. Fault detection during power up sequence is masked until RSTN release to avoid false triggering at ramp-up phase.
2. No VDD5 UV/OV violation is expected during specified transient.
Table 29. Pre-buck regulator output electrical characteristics (continued)
Symbol
Parameter
Test condition
Min
Typ
Max
Unit
Pin
Table 30. Pre-buck regulator external components electrical characteristics (Vpre application
information)
Symbol
Parameter
Note
Min
Typ
Max
Unit
Pin
CVPRE
External
capacitor on
Vbuck supply
Min 2*10 µF Ceramic X7R 16 V in
parallel
CER,X7R,10 µF, 10%,16 V,1206,
Sn
15
40
150
µF
VPRE
LVPRE
Switching
regulator external
inductor
-15
22
29
µH
VPRE
CBST
Bootstrap
capacitor
Ceramic X7R 16V
47nF, 10%, 16 V, X7R, 0603,
TINNED, CER CAP/
-
47
-
nF
BUCK_C_BST
DVBUCK_CTRL
Switching
regulator external
diode (Schottky
or ultrafast)
Schottky Diode STPS5L60-Y
-
-
-
-
-



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