L9961 datasheet(48/65 Pages) STMICROELECTRONICS

48 / 65 page

Application information

5.1

Power supply circuit

Figure 16. Power supply circuit

GADG220620221348SA

Table 33. Recommended power supply components

Components Value Unit

Max.

tolerance

Rating

Comments

μH

20%

100 mA

LPF inductance for battery path. The filter cut-off frequency is

fC= 1

2π LBCB1+CB2

CB1

μF

10%

50 V

Provide battery stabilization. Filter noise on VB sense line.

CB2

220

10%

50 V

Filter high frequency noise on VB sense line. Place as close as

possible to VB pin.

CCP

10%

25 V

Charge pump tank capacitor. Mount as close as possible to VCP pin.

CCP_1

6.8

10%

50 V

Charge pump flying capacitor. Mount as close as possible to

VCP1P/1M pin.

CCP_2

6.8

10%

50 V

Charge pump flying capacitor. Mount as close as possible to

VCP2P/2M pin.

CVREG

4.7

μF

10%

16 V

Tank for the VREG regulator. Mount as close as possible to VREG pin.

Part number C0805C475K4RACAUTO

The BAT54SWFILMY is recommended for protecting VB against

reverse battery

L9961

Application information

DS14012 - Rev 3

page 48/65

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