RT8015BGQW 데이터 시트보기 (PDF) - Richtek Technology

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RT8015BGQW

3A, 2MHz, Synchronous Step-Down Converter

Richtek Technology 

RT8015B

Typical Application Circuit

VIN

5V

CIN

22µF

PGOOD

R4

100k

RT8015B

6 PVDD

LX 3, 4

L1

2.2µH

R3

1

C1

0.1µF

7 VDD

8 PGOOD

FB 9

COMP 10

RCOMP

27k

CF

22pF

CCOMP

1nF

ROSC

332k

1 SHDN/RT

GND 2

PGND 5

Note : Using all Ceramic Capacitors

R1

510k

R2

240k

VOUT

2.5V/3A

COUT

22µF x 2

Table 1. Recommended Component Selection

VOUT (V)

R1 (kΩ)

R2 (kΩ)

RCOMP (kΩ)

3 .3

75 0

2 40

30

2 .5

51 0

2 40

27

1 .8

30 0

2 40

22

1 .5

21 0

2 40

18

1 .2

12 0

2 40

15

1 .0

60

2 40

13

CCOMP (nF)

1

1

1

1

1

1

L1 (μH)

2. 2

2. 2

2. 2

2. 2

1. 0

1. 0

COUT (μF)

22 x 2

22 x 2

22 x 2

22 x 2

22 x 2

22 x 2

Functional Pin Description

Pin No.

WDFN

SOP-8

-10L 3x3 (Exposed Pad)

Pin Name

1

1

SHDN/RT

2

2

GND

3, 4

3

LX

5

4

PGND

Pin Function

Oscillator Resistor Input. Connecting a resistor to ground from this

pin sets the switching frequency. Forcing this pin to VDD causes the

device to be shut down.

Signal Ground. All small signal components and compensation

components should connect to this ground, which in turn connects to

PGND at one point.

Internal Power MOSFET Switches Output. Connect this pin to the

inductor.

Power Ground. Connect this pin close to the negative terminal of CIN

and COUT.

6

5

PVDD

Power Input Supply. Decouple this pin to PGND with a capacitor.

7

6

VDD

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

Normally VDD is equal to PVDD.

Power Good Indicator. This pin is open drain logic output that is

8

--

PGOOD

pulled to ground when the output voltage is not within ±12.5% of

regulation point.

9

7

FB

Feedback Pin. This pin receives the feedback voltage from a

resistive divider connected across the output.

Error Amplifier Compensation Point. The current comparator

10

8

COMP

threshold increases with this control voltage. Connect external

compensation elements to this pin to stabilize the control loop.

11

--

(Exposed Pad)

No Internal Connection. The exposed pad must be soldered to a

large PCB and connected to GND for maximum power dissipation.

--

9

GND

The exposed pad must be soldered to a large PCB and connected to

GND for maximum power dissipation.

www.richtek.com

2

DS8015B-04 March 2011

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