L9924TR datasheet(44/85 Pages) STMICROELECTRONICS

44 / 85 page

Electrical specifications

L9924

44/85

DocID029638 Rev 2

5.3.18

Pin "PH_OUT"

The PH_OUT pin exports the filtered PH signal. PH_OUT is driven by a push pull output and

must withstand 48V as absolute voltage.

If the PH_OUT current exceeds the IPHOX,LIM value, then the bit 10 of SPI register 0x12 is

set [13.4.6]

5.3.19

Charge pump output

The two-stage charge pump is supplied by A+/B+ pin. External flying capacitors are used to

achieve the requested charge pump current capability. This current capability has a current

limitation. In both standby mode and thermal shutdown the charge pump is disabled.

In case the charge pump output voltage V(CP) remains lower than VCP,LOW for longer than

tCP,LOW parameter a charge pump low output fault condition is latched and bit 8 of SPI

The following capacitors are suggested: CP1 = 22nF, CP2 = 22nF, CP = 100nF. CP must be

connected between CP and A+/B+ pins

Table 28. Electrical characteristics pin "PH_OUT"

Symbol

Parameter

Test Condition

Min.

Typ.

Max. Unit

VPHOL

Low side saturation

voltage

I(PH_OUT) = 5 mA

0.90

1.15

1.40

2IPHOL,LIM

Low-side current

limitation

-25

VPHOH

High side saturation

voltage

I(PH_OUT) = -5 mA

Charge pump in OFF state

0.90

1.15

1.40

4IPHOH,LIM

High-side current

limitation

--50

-25

5tPHOL

Low side current

limitation filter time

Analogue symmetrical filter time

μs

6tPHOH

High side current

limitation filter time

Analogue symmetrical filter time

μs

Table 29. Charge pump output electrical characteristics

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

1VCP

Charge pump output

voltage (both 12-V and

24-V systems)

V(A+/B+) ≥ 12 V

I(CP) = -13 mA

ICP,TAIL = 128 mA

V(A+/B+)+11

V(A+/B+)+13

V(A+/B+)+15

2ICP

Charge pump output

current

ICP = I(CP) < 0

assuring V(CP)-

V(A+/B+)>VCP,LOW

45 mA ≤ ICP,TAIL ≤

128 mA

-13

3VCP,LOW

Charge-pump-low

voltage threshold

V(A+/B+)+4.7 V(A+/B+)+5.4 V(A+/B+)+6.1

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