ADP3020 查看數據表（PDF） - Analog Devices

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ADP3020

High-Efficiency Notebook Computer Power Supply Controller

Analog Devices 

ADP3020

Pin No. Mnemonic

1

CS5

2

FB5

3

EAN5

4

EAO5

5

ADJ/FX5

6

SS5

7

CLSET5

8

REF

9

AGND

10

CLSET3

11

MODE

12

SYNC

13

SS3

14

ADJ/FX3

15

EAO3

16

EAN3

17

FB3

18

CS3

19

PFI

20

PFO

21

PWRGD

22

CPOR

23

SD2

24

FB2

25

DRV2

26

BST3

27

DRVH3

28

SW3

29

DRVL3

30

VIN

PIN FUNCTION DESCRIPTIONS

Function

Current Sense Input for top N-Channel MOSFET of the 5 V Buck Converter. Connect to the drain of

the top N-channel MOSFET.

Feedback Input for the 5 V Buck Converter. Connect to the output sense point in fixed output mode.

Connect to an external resistor divider in adjustable output mode.

Inverting Input of the Error Amplifier of the 5 V Buck Converter. Use for external loop compensation

only in fixed output mode. In adjustable output mode, connect to an external resistor divider.

Error Amplifier Output for the 5 V Buck Converter.

TTL Logic Input. When ADJ/FX5 = 0 V, fixed output mode, connect FB5 to the output sense point.

When ADJ/FX5 = 5 V, adjustable output mode, connect FB5 to the external resistor divider.

Soft Start for the 5 V Buck Converter. Also used as an ON/OFF Pin.

Current Limit Setting. A resistor can be connected from AGND to CLSET5. A minimum current

limit is obtained by leaving it unconnected. A max current limit is obtained by connecting it to AGND.

1.2 V Bandgap Reference. Bypass it with a capacitor (1 nF typical) to AGND. REF cannot be used

directly with an external load.

Analog Signal Ground.

Current Limit Setting. A resistor can be connected from AGND to CLSET3. A minimum current

limit is obtained by leaving it unconnected. A max current limit is obtained by connecting it to AGND.

TTL Logic Input. MODE = 5 V, always in constant frequency PWM mode; MODE = 0 V, PWM

mode at moderate and heavy loads, and Power Saving (PSV) Mode at light load.

Oscillator Synchronization and Frequency Select. fOSC = 200 kHz, when SYNC = 0 V; fOSC = 300 kHz, if

SYNC is tied to the REF Pin; fOSC = 400 kHz, when SYNC = 5 V. Oscillator can be synchronized with an

external source through the SYNC Pin.

Soft Start for the 3.3 V Buck Converter. Also used as an ON/OFF Pin

TTL Logic Input. When ADJ/FX3 = 0 V, fixed output mode, connect FB3 to the output sense point.

When ADJ/FX3 = 5 V, adjustable output mode, connect FB3 to external resistor divider.

Error Amplifier Output for the 3.3 V Buck Converter.

Error Amplifier Inverting Input of the 3.3 V Buck Converter. Use for external loop compensation only in

fixed output mode. In adjustable output mode, connect to an external resistor divider.

Feedback Input for the 3.3 V Buck Converter. Connect to output sense point in fixed output mode.

Connect to an external resistor divider in adjustable output mode.

Current Sense Input for Top N-Channel MOSFET of the 3.3 V Buck Converter. It should be con-

nected to the drain of the N-channel MOSFET.

The (–) Input of a comparator that can be used as a power fail detector. The positive input is connected

to the 1.20 V reference. There is a 24 mV hysteresis for this comparator.

Open Drain Output. This pin will sink current when the PFI pin is lower than 1.20 V. Otherwise, PFO

is floating.

Power Good Output. PWRGD goes low with no delay, whenever the 5 V output drops 8% below its

nominal value. When the 5 V output is within –4% of its nominal value, PWRGD will be released after a

time delay determined by the timing capacitor on the CPOR pin.

Connect a capacitor between CPOR and AGND to set the delay time for the PWRGD pin. A 2.5 µA

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

by grounding this pin.

Shutdown input for the Linear Regulator Controller.

Feedback for the Linear Regulator Controller.

Open Collector Output for the Linear Regulator Controller.

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

High Side Gate Driver for 3.3 V Buck Converter.

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

Low Side Gate Driver of 3.3 V Buck Converter.

Main Supply Input (4.5 V to 25 V).

–4–

REV. 0

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