LB11948T

No.7947-4/12

Pin Functions

Pin No.

Symbol

Functional descriptions

1

OUT1

−

Output

2

OUT1

Output

3

NC

Unused

4

NC

Unused

5

D

−GND

Lower side internal diode anode connection

6

E1

Constant current control sensing

The motor current is set by the value of the sensing resistor Re connected between the E1 pin and ground.

7

VS1

VS power supply

8

NC

Unused

9

10

CR

RC oscillator connection

11

VREF1

Current setting system reference voltage input

VREF1 voltage range: 0 to 0.5 V

12

NC

Unused

13

ENABLE1

Logic level input

The output is turned off when ENABLE1 is low, and the outputs are turned on (operating state) when ENABLE2 is high.

14

PHASE1

Logic level input: phase switching

When PHASE1 = high: Output pin states: OUTA: high, OUTA-: low.

When PHASE1 = low: Output pin states: OUTA: low, OUTA-: high.

15

ST

Standby mode setting

When ST = high: the IC operates in normal operating mode.

16

NC

Unused

17

1VREG

1 V regulator circuit output

The LB11948 includes an internal 1 V regulator circuit, and this pin is the output from that circuit. The VREF1 and VREF2

reference voltages can be set by voltage dividing the 1 V regulator output.

18

PHASE2

Logic level input: phase switching

When PHASE2 = high: Output pin states: OUTA: high, OUTA-: low.

When PHASE2 = low: Output pin states: OUTA: low, OUTA-: high.

19

ENABLE2

Logic level input

The output is turned off when ENABLE1 is low, and the outputs are turned on (operating state) when ENABLE2 is high.

20

VREF2

Current setting reference voltage input

VREF2 voltage range: 0 to 0.5 V

21

GND

Ground (small signal circuit system ground)

22

PGND

Power system ground (high current circuit system ground)

23

NC

Unused

24

VS2

VS power supply

25

E2

Constant current control sensing

The motor current is set by the value of the sensing resistor Re connected between the E2 pin and ground.

26

D

−GND

Lower side internal diode anode connection

27

NC

Unused

28

NC

Unused

29

OUT2

Output

30

OUT2

−

Output