ADD8754ACPZ-REEL7 Просмотр технического описания (PDF) - Analog Devices
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ADD8754ACPZ-REEL7 Datasheet PDF : 28 Pages
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ADD8754
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
24 23 22 21 20 19
GND 1
VGH_M 2
VFLK 3
VDPM 4
VDD_1 5
VDD_2 6
ADD8754
TOP VIEW
(Not to Scale)
18 LX
17 VIN_2
16 FREQ
15 COMP
14 SS
13 VIN_1
7 8 9 10 11 12
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
VCOM Amplifier Supply.
7
OUT
VCOM Amplifier Output.
8
NEG
Inverting Input of VCOM Amplifier.
9
POS
Noninverting Input of VCOM Amplifier.
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.
Rev. 0 | Page 8 of 28
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