L9945 datasheet(27/151 Pages) STMICROELECTRONICS

27 / 151 page

Figure 14. Clamping for LS configuration

To load

To PGND

IPU

IPD

VGBHI

Internal

clamping

Control

signal

Control

signal

Device side

Board side

LS NFET

GNSPxx

SNGPxx

DRNxx

External

clamping

VBATT

GADG2702171519PS

Figure 14 shows the recommended clamping solutions for the LS configuration. Voltage on the DRNx pin has to

be limited to prevent component damage. A suppressor circuit can be used to clamp the voltage on DRNx pin

(AMR is 60 V). For the freewheeling of inductive loads:

•

A Zener feedback to the gate can be a solution to allow active freewheeling;

•

A diode on DRNx pin can be used to allow passive freewheeling towards battery.

5.4.6

Electrical characteristics

The table below lists the electrical characteristics for the output pre-drivers.

Note:

Tj = Tj_op; VVPS_UV < VVPS < 60 V, all supplies are independent; 4.5 V < VDD5 < 5.5 V; 3.0 V < VIO < 5.5 V,

unless otherwise noted. A current flowing out of L9945 has minus (-) sign; a current flowing into L9945 has plus

(+) sign. Charge currents turn ON the NMOS and OFF the PMOS. Discharge currents turn OFF the NMOS and

ON the PMOS.

Table 15. Output pre-driver stages electrical characteristics

Symbol

Parameter

Test condition

Min. Typ. Max. Unit

VGNSP -VSNGP Gate Output voltage (Reversed for PMOS)

ICh3Gx

Gate charge current NMOS

GCC[1:0] = [1, 1]

-1.88

-1.1

Gate charge current PMOS

-1.85

-0.55 mA

ICh2Gx

Gate charge current NMOS and PMOS

GCC[1:0] = [1, 0]

-8.6

-4

ICh1Gx

Gate charge current NMOS and PMOS

GCC[1:0] = [0, 1]

-32.4

-19.6 mA

ICh0Gx

Gate charge current NMOS

GCC[1:0] = [0, 0]

-100

-40

Gate charge current PMOS

-77

-43.5 mA

IDCh3Gx

Gate discharge current NMOS and PMOS

GCC[1:0] = [1, 1]

0.75

1.9

IDCh2Gx

Gate discharge current NMOS and PMOS

GCC[1:0] = [1, 0]

3.8

7.4

IDCh1Gx

Gate discharge current NMOS and PMOS

GCC[1:0] = [0, 1]

16.8

27.4

IDCh0Gx

Gate discharge current NMOS and PMOS

GCC[1:0] = [0, 0]

101

Tsw_GC

Delay to switch from GCC[a,b] to GCC[c,d]

0.1

µs

L9945

Output pre-drivers

DS12275 - Rev 8

page 27/151

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