ADP3025 データシートの表示（PDF） - Analog Devices

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ADP3025

High Efficiency Dual Output Power Supply Controller

Analog Devices 

ADP3025

Pin No.

19

20

21

22

23

24

25

26

27

28

29

30

32, 34

33

35

36

37

38

Mnemonic

PFI

PFO

PWRGD

CPOR

COMP2/SD2

FB2

DRV2

BST3

DRVH3

SW3

DRVL3

VIN

PGND2, 1

SD

DRVL5

SW5

DRVH5

BST5

Function

Negative Input of a Comparator that can be Used as a Power-Fail Detector. The positive input is connected to

the 800 mV reference. There is a 14 mV hysteresis for this comparator.

Power Failure Output, Open Drain Output. This pin sinks current when the PFI pin is lower than 800 mV.

Otherwise, PFO is floating.

Power Good Output. PWRGD goes low with no delay whenever the 5 V output drops 7% below its nominal

value. When the 5 V output is within –3% of its nominal value, PWRGD is released after a time delay determined

by the timing capacitor on the CPOR pin.

Power-On Reset Capacitor. Connect a capacitor between CPOR and AGND to set the delay time for the PWRGD

pin. A 1 µA pull-up current is used to charge the capacitor. A manual reset (MR) function can also be achieved

by pulling this pin low.

Compensation Input for the Linear Regulator Controller. Connect an RC network to GND for stable operation.

This pin is also used as an ON/OFF pin of the linear regulator controller.

Feedback for the Linear Regulator Controller.

NMOS Gate Drive Output for the Linear Regulator Controller.

Boost Capacitor Connection for High-Side Driver of the 3.3 V Buck Converter.

High-Side Gate Drive for the 3.3 V Buck Converter.

E Switching Node (Inductor) Connection of the 3.3 V Buck Converter.

Low-Side Gate Drive of the 3.3 V Buck Converter.

Main Supply Input (5.5 V to 25 V).

T Power Ground. Pins 32 and 34 must be connected together for proper operation.

Shutdown Control Input, Active Low. If SD = 0 V, the chip is in shutdown mode with very low quiescent current.

For automatic startup, connect SD to VIN via a resistor.

Low-Side Gate Drive for the 5 V Buck Converter.

E Switching Node (Inductor) Connection for the 5 V Buck Converter.

High-Side Gate Drive for the 5 V Buck Converter.

OBSOL Boost Capacitor Connection for the High-Side Driver of the 5 V Buck Converter.

Rev. A | Page 7 of 24

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