L9961_V01 datasheet(53/65 Pages) STMICROELECTRONICS

53 / 65 page

Components Value Unit Max. tolerance Rating

Comments

RNSHIP_PD

100

kΩ

10%

1/10 W Pull-down resistor

RWAKEUP

kΩ

10%

1/10 W Debouncing filter resistor for pushbutton

CNSHIP

100

10%

50 V

Debouncing filter capacitor for pushbutton

CWAKEUP

100

10%

50 V

Debouncing filter capacitor for pushbutton

CRDY

100

10%

16 V

LPF capacitor for RDY signal. The filter cut-off frequency is

fC= 1

2πRRDYCRDY

Pushbutton to wakeup L9961 from SHIPMENT - DEEP SLEEP state

DWAKEUP

Blocking diode

5.8

Charger connection

In case of LS configuration if the charger is hot-plugged (that is with its two terminals not in HiZ condition), the

VSC pin needs to be protected against AMR violation. ST recommends the application circuit in Figure 23.

On the contrary, the HS configuration does not require any additional component but requires to connect FET’s

common drain to Vb in order to feed the CP with the higher voltage between battery stack and battery charger,

thus ensuring the right overdrive to switch on discharge MOSFET.

Figure 23. Application circuit in LS/HS configuration

GADG220620221409SA

L9961

VSD

DCHG CHG

VSC

P+

P-

RDCHG

RCHG

MDCHG

MCHG

LS configuration

DZCHG

DCX144EU-7-F

RGCHG

HS configuration

L9961

P-

P+

VSD

DCHG

CHG

VSC

RDCHG

RCHG

MDCHG

MCHG

P-

P+

Table 40. BOM in LS configuration when charger is hot-plugged

Components

Value Unit Max. tolerance Rating

Comments

RCHG

220

kΩ

10%

1/10 W Pull-down resistor

RGCHG

kΩ

10%

1/10 W Limits Zener current

DZCHG

Clamps the VGS of the CHG MOSFET

DCX144EU-7-F

Level shifter used to drive the CHG MOSFET. DCX144EU-7-F NPN-

PNP transistor switch pair is suggested.

L9961

Charger connection

DS14012 - Rev 3

page 53/65

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