L9788 datasheet(72/264 Pages) STMICROELECTRONICS

72 / 264 page

Multi-voltage regulator supplies

L9788

72/264

DS12308 Rev 4

6.3

Tracking regulator for sensors supply

There are three 5V tracking regulators with self protection from over-current, over-voltage

and short to battery. STB/OVC/OV don't disable tracking, but set a flag readable by MSC.

Those three tracking regulators track VDD5_in voltage with 150mA output. There is one

thermal sensor, shared between the three tracking regulators, to provide the thermal shut

down protection for those three tracking sensor supplies. The switching off of one internal

tracking occurs if that tracking is also in OVC.

Once the thermal shut down has happened, the tracking sensor in over-current condition

will be off until temperature decreases to thermal shut down threshold low. Those three

tracking regulators can be singularly disabled by dedicated MSC bit (TRK_EN

CONFIG_REG7 [3:5] in CONFIG_REG 7). VB_IN_OV fault can trigger the turn OFF of

Tracking regulators, as specified into reset matrix. This effect can be masked with bit

VB_IN_OV_RST_EN in CONFIG_REG 12.

Conditions:

5.5 V < VB_IN_SW ≤ 18 V, Tj -40 to 175 °C unless otherwise specified.

Table 31. Tracking sensor supplies electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

∆VTRK

Output voltage tracking

error (including voltage

aging and static

load/line transient

regulation)(1)

Vpre = 5.6 – 18 V



1 mA<IVSENS<150 mA

VDD5

-15m

VDD5

+15m

VSENSE1/2/3

IMAX_VS

Output current limitation VSENS = -1 V

150

250

VSENSE1/2/3

ITH_VS

Output over-current

threshold

Vpre = 5.6 – 18 V

150

Imax

_vs

VSENSE1/2/3

Vline_VS

Line regulation voltage

Vpre = 5.6 – 18 V

IVSENS=50mA

Ctrk=470nF (2)

VSENSE1/2/3

Vload_VS

Load regulation voltage

Vpre = 6 V

1 mA<IVSENS<150 mA

Ctrk = 470 nF Note(2)

VSENSE1/2/3

Vload_tran

Transient load

regulation

Vpre = 6 V IVSENS =1 mA

to 150 mA and viceversa

dI/dt = 150 mA/µs

Ctrk = 470 nF Guaranteed

by design(3)

-15

+15

VSENSE1/2/3

Vline_tran

Transient line regulation

VPRE step 5.6V to 7V and

viceversa

dVPRE/dt=3V/µs IVSENS

=1mA, 150mA Ctrk=470nF

Guaranteed by design(4),

(3)

-15

+15

VSENSE1/2/3

Isink_VS

Short circuit reverse

current

Output shorted to

VB_IN+2V

-4

VSENSE1/2/3

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