L9963E datasheet(54/184 Pages) STMICROELECTRONICS

54 / 184 page

4.8.1

Linear regulators

VREG

This is a linear regulator that exploits an external MOS in order to decrease the power dissipation inside L9963E.

It acts as pre-regulator supplying all other internal regulatos (VANA, VCOM, VTREF and VDIG). It is switched

OFF in low power modes (Sleep, Silent Balancing, OFF phase of Cyclic Wakeup). The source of the MOS is

connected to VREG pin, while the gate is connected to NPNDRV pin and the drain to VBAT. VREG regulator has

to be intended for L9963E use only. For the regulator external components, refer to Table 73.

VREG regulator has a dedicated UV/OV diagnostic:

•

if VREG voltage goes below VVREG_UV threshold for a time longer than TVREG_FILT a VREG undervoltage

condition is latched into VREG_UV flag and the bootstrap is disabled;

•

if VREG voltage goes over VVREG_OV threshold for a time longer than TVREG_FILT a VREG overvoltage

condition is latched into VREG_OV flag.

VANA

This low drop regulator supplies all the ADC, comparators, monitors, main bandgap, current generator and other

analogic blocks. An external stabilization capacitance placed close to the pin is needed (see Table 73). VANA

regulator has to be intended for L9963E use only.

VANA regulator has a dedicated UV/OV diagnostic:

•

if VANA voltage goes below VVANA_UV threshold for a time longer than TPOR_FILT a POR condition is

triggered;

•

if VANA voltage goes over VVANA_OV threshold for a time longer than TVANA_OV_FILT a VANA overvoltage

condition is latched into VANA_OV flag.

VANA regulator has an internal current limitation, its value is IVANA_curr_lim.

VCOM

The isolated communication receiver/transmitter and the GPIO output buffers are supplied by this low drop

regulator. An external stabilization capacitance placed close to the pin is needed (see Table 73).

VCOM regulator can also be used to supply external loads with IVCOM_ext max. current budget.

VCOM regulator has a dedicated UV/OV diagnostic:

•

if VCOM voltage goes below VVCOM_UV threshold for a time longer than TVCOM_FILT a VCOM undervoltage

condition is latched into VCOM_UV flag;

•

if VCOM voltage goes over VVCOM_OV threshold for a time longer than TVCOM_FILT a VCOM overvoltage

condition is latched into VCOM_OV flag.

VCOM regulator has an internal current limitation, its value is IVCOM_curr_lim.

VTREF

This low drop regulator is used as precise voltage reference to supply external components such as NTCs for

temperature sensing. An external stabilization capacitance placed close to the pin is needed (see Table 73).

VTREF regulator has IVTREF_ext max. current budget. The recommended application circuit in NTC Analog

Front End guarantees that each NTC channel sinks no more than 500 μA.

VTREF regulator has a dedicated UV/OV diagnostic:

•

if VTREF voltage goes below VVTREF_UV threshold for a time longer than TVTREF_FILT a VTREF

undervoltage condition is latched into VTREF_UV flag;

•

if VTREF voltage goes over VVTREF_OV threshold for a time longer than TVTREF_FILT a VTREF overvoltage

condition is latched into VTREF_OV flag.

VTREF regulator has an internal current limitation, its value is IVTREF_curr_lim.

VTREF regulator is disabled by default. Its operation can be controlled via SPI according to Table 55.

VDIG

VDIG regulator has a dedicated UV/OV diagnostic:

•

if VDIG voltage goes below VVDIG_UV threshold for a time longer than TPOR_FILT a POR condition is

triggered;

•

if VDIG voltage goes over VVDIG_OV threshold for a time longer than TVDIG_FILT a VDIG overvoltage

condition is latched into VDIG_OV flag.

L9963E

Device regulators

DS13636 - Rev 12

page 54/184

L9963E 数据表(PDF) 54 Page - STMicroelectronics

L9963E 数据表(HTML) 54 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载