ADD8754

Rev. 0 | Page 8 of 28

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

24

1

2

3

4

5

6

18

17

16

15

14

13

23

22

21

20

19

78

9

10

11

12

TOP VIEW

(Not to Scale)

ADD8754

GND

VGH_M

VFLK

VDPM

VDD_1

VDD_2

LX

VIN_2

FREQ

COMP

SS

VIN_1

Figure 2. Pin Configuration

Table 7. Pin Function Descriptions

Pin

Mnemonic

Description

1

GND

Ground.

2

VGH_M

Gate Pulse Modulator Output. This pin supplies the gate drive signal.

3

VFLK

Gate Pulse Modulator Control Input.

4

VDPM

Gate Pulse Modulator Enable. VGH_M is enabled when the voltage on this pin is more than 2.2 V. VGH_M goes to

GND when this pin is connected to GND.

5

VDD_1

Gate Pulse Modulator Low Voltage Input.

6

VDD_2

V

Amplifier Supply.

COM

7

OUT

V

Amplifier Output.

COM

8

NEG

Inverting Input of V

Amplifier.

COM

9

POS

Noninverting Input of V

Amplifier.

COM

10

AGND

Analog Ground.

11

ADJ

LDO Output Voltage Select. Refer to Table 13 for details.

12

LDO_OUT

LDO Output.

13

VIN_1

Supply Input. This pin supplies power to the LDO and step-up switching regulator. Typically connected to VIN_2.

14

SS

Soft Start. A capacitor must be connected between GND and this pin to set the soft start time.

15

COMP

Compensation for the Step-Up Converter. A capacitor and resistor are connected in series between GND and this

pin for stable operation.

16

FREQ

Frequency Select. Set the switching frequency with a logic level. The step-up switching regulator operates at 650 kHz

when this pin is connected to GND and at 1.2 MHz when connected to VIN_1.

17

VIN_2

Step-Up Switching Regulator Power Supply. This pin supplies power to the driver for the switch. Typically

connected to VIN_1.

18

LX

Step-Up Switching Regulator Switch Node.

19

SHDN

Device Shutdown Pin. This pin allows users to shut the device off when connected to GND. The normal operating

mode is to pull this pin to VIN_1.

20

FB

Feedback Voltage Sense to Set the Output Voltage of the Step-Up Switching Regulator.

21

PGND

Step-Up Switching Regulator Power Ground.

22

CE

GPM Time Delay. A capacitor must be connected between GND and this pin to set the delay time.

23

RE

GPM Negative Ramp Rate. A resistor must be connected between GND and this pin to set the negative ramp rate.

24

VGH

Gate Pulse Modulator High Voltage Input.