ADP2102YCPZ-1-R7 데이터 시트보기 (PDF) - Analog Devices

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ADP2102YCPZ-1-R7

Low Duty Cycle, 600 mA, 3 MHz Synchronous Step-Down DC-to-DC Converter

Analog Devices 

ADP2102

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

MODE 1

8 AVIN

EN 2

FB/OUT 3

AGND 4

ADP2102

TOP VIEW

(Not to Scale)

7 PVIN

6 LX

5 PGND

Figure 3. Pin Configuration

Table 4. Pin Function Descriptions

Pin

No. Mnemonic Description

1

MODE

Mode Input. To set the ADP2102 to forced continuous conduction mode (CCM), drive MODE high. To set the ADP2102

to power save mode/auto mode (PSM), drive MODE low.

2

EN

Enable Input. Drive EN high to turn on the ADP2102. Drive EN low to turn it off and reduce the input current to 0.1 μA.

This pin cannot be left floating.

3

FB/OUT

Output Sense Input or Feedback Input. For fixed output versions, OUT is the top of the internal resistive voltage

divider. Connect OUT to the output voltage. For adjustable (no suffix) versions, FB is the input to the error amplifier.

Drive FB through a resistive voltage divider to set the output voltage. The FB regulation threshold is 0.8 V.

4

AGND

Analog Ground. Connect AGND to PGND at a single point as close to the ADP2102 as possible. The exposed paddle is

electrically common with the analog ground pin.

5

PGND

Power Ground.

6

LX

Switch Output. LX is the drain of the P-channel MOSFET switch and the N-channel synchronous rectifier. Connect the

output LC filter between LX and the output voltage.

7

PVIN

Power Source Input. Drive PVIN with a 2.7 V to 5.5 V power source. A ceramic bypass capacitor of 2.2 μF or greater is

required on this pin to the nearest PGND plane.

8

AVIN

Power Source Input. AVIN is the supply for the ADP2102 internal circuitry. This pin can be connected in three different ways.

For noise reduction, place an external RC filter between PVIN and AVIN. The recommended values for the

external RC filter are 10 Ω and 0.1 μF, respectively. This configuration can be used for all loads.

For light-to-medium loads up to 300 mA, the AVIN pin and the PVIN pin can be shorted together.

For light-to-heavy loads (greater than 300 mA), bypass the AVIN pin with a 1 pF to 0.01 μF capacitor to the

nearest PGND plane. Do not short the AVIN and PVIN pins when using only a bypass capacitor.

Rev. B | Page 5 of 24

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