RT8023 Ver la hoja de datos (PDF) - Richtek Technology

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Fabricante

RT8023

1.2MHz 1.5A Synchronous Step-Down Converter with Two LDOs

Richtek Technology 

RT8023

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

PGOO D1

2

VDD1

3, 4, 5

VIN1

6,

PGND

25 (Exposed Pad)

8, 9

PHASE1

11

VIN2

12

VOUT2

13

FB2

14

PGOO D2

15

EN2

16

EN3

17

PGOO D3

18

FB3

19

AGND

20

VOUT3

21

VIN3

Power Good Indicator of step-down converter. Open-drain logic output that is

opened when the output voltage exceeds 90% of the regulation point.

Signal Input Supply. Decouple this pin to GND with a capacitor. Normally VIN1 is

equal to VDD1. Keep the voltage difference between VDD1 and VIN1 less than

0.5V.

Power Input Supply of step-down converter. Decouple this pin to GND with a

capacitor.

Power Ground. Must be soldered to PCB ground for electrical contact and

optimum thermal performance. The exposed pad must be soldered to a large

PCB and connected to PGND for maximum power dissipation.

Internal Power MOSFET Switches Output of step-down converter. Connect this

pin to the inductor.

Power Input Supply of LDO1. Decouple this pin to GND with a 1Uf or greater

capacitor.

Output of LDO1. A 1Uf or greater output low-ESR ceramic capacitor is required

for stability..

Feedback Pin of LDO1. Receives the feedback voltage from a resistive divider

connected across the output.

Power Good Indicator of LDO1. Open-drain logic output that is opened when the

output voltage exceeds 90% of the regulation point.

LDO1 Enable. A logical high level at this pin enables LDO1, while a logical low

level causes LDO1 to shut down.

LDO2 Enable. A logic high level at this pin enables LDO2, while a logic low level

causes LDO2 to shut down.

Power Good Indicator of LDO2. Open-drain logic output that is opened when the

output voltage exceed 90% of regulation point.

Feedback Pin of LDO2. Receives the feedback voltage from a resistive divider

connected across the output.

Analog Grand. All small-signal of the IC should connect to this ground, which

connects to PGND at one point for away exposed pad.

Output of LDO2. A 1uF or greater output low-ESR ceramic capacitor is required

for stability.

Power Input Supply of LDO2. Decouple this pin to GND with a 1uF or greater

capacitor.

7, 10, 22

NC

No Internal Connection.

Feedback Pin of step-down converter. Receives the feedback voltage from a

23

FB1

resistive divider connected across the output.

Step-down converter Enable. A logic high level at this pin enables step-down

24

EN1

converter, while a logic low level causes step-down converter to shut down.

DS8023-03 March 2011

www.richtek.com

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