Richtek RT8223AGQW, RT8223AZQW, RT8223BGQW, RT8223BZQW Schematic [ru]

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RT8223A/B

High Efficiency, Main Power Supply Controller for Notebook Computers

General Description

The RT8223A/B dual step-down, switch-mode powersupply controller generates logic-supply voltages in battery-powered systems. The RT8223A/B includes two pulse-width modulation (PWM) controllers fixed at 5V/ 3.3V or adjustable from 2V to 5.5V. This device also features 2 linear regulators providing fixed 5V and 3.3V outputs. The linear regulator each provides up to 70mA output current with automatic linear-regulator bootstrapping to the PWM outputs. The RT8223A/B includes on-board power-up sequencing, the power good output, internal softstart, and internal soft-discharge output that prevents negative voltages on shutdown.

A constant on-time PWM control scheme operates without sense resistor and provides 100ns response to load transients while maintaining a relatively constant switching frequency. The unique ultrasonic mode maintains the switching frequency above 25kHz, which eliminates noise in audio applications. Other features include diodeemulation mode (DEM), which maximizes efficiency in light-load applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive application

Ordering Information

RT8223

Package Type

QW : WQFN-24L 4x4 (W-Type)

Lead Plating System

G : Green (Halogen Free and Pb Free)

Z : ECO (Ecological Element with

Halogen Free and Pb free)

Pin Function

A : Default

B : With ENC

Note :

Richtek products are :

`RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.

`Suitable for use in SnPb or Pb-free soldering processes.

Features

zWide Input Voltage Range 6V to 25V

zDual Fixed 5V/3.3V Outputs or Adjustable from 2V to 5.5V, 1.5% Accuracy

zFixed 3.3V and 5V LDO Output : 70mA

z2V Reference Voltage ±1% : 50μA

zConstant ON-Time Control with 100ns Load Step Response

zFrequency Selectable via TONSEL Setting

zRDS(ON) Current Sensing and Programmable Current Limit combined with Enable Control

zSelectable PWM, DEM, or Ultrasonic Mode

zInternal Soft-Start and Soft-Discharge

zHigh Efficiency up to 97%

z5mW Quiescent Power Dissipation

zThermal Shutdown

zRoHS Compliant and Halogen Free

Applications

zNotebook and Sub-Notebook Computers

z3-Cell and 4-Cell Li+ Battery-Powered Devices

Marking Information

For marking information, contact our sales representative directly or through a Richtek distributor located in your area.

DS8223A/B-04 April 2011

www.richtek.com

 

1

RT8223A/B

Pin Configurations

(TOP VIEW)

 

VOUT1

PGOOD

BOOT1

UGATE1

PHASE1

LGATE1

 

 

24

23

22

21

20

19

 

ENTRIP1

1

 

 

 

 

18

NC

FB1

2

 

 

 

 

17

VREG5

REF

3

 

GND

 

16

VIN

TONSEL

4

 

 

15

PGND

 

 

 

 

FB2

5

 

 

 

25

14

SKIPSEL

ENTRIP2

6

 

 

 

 

13

EN

 

7

8

9

10

11

12

 

 

VOUT2

VREG3

BOOT2

UGATE2

PHASE2

LGATE2

 

 

 

RT8223A

 

 

 

WQFN-24L 4x4

 

 

VOUT1

PGOOD

BOOT1

UGATE1

PHASE1

LGATE1

 

 

24

23

22

21

20

19

 

ENTRIP1

1

 

 

 

 

18

ENC

FB1

2

 

 

 

 

17

VREG5

REF

3

 

GND

 

16

VIN

TONSEL

4

 

 

15

PGND

 

 

 

 

FB2

5

 

 

 

25

14

SKIPSEL

ENTRIP2

6

 

 

 

 

13

EN

 

7

8

9

10

11

12

 

 

VOUT2

VREG3

BOOT2

UGATE2

PHASE2

LGATE2

 

 

 

RT8223B

 

 

 

WQFN-24L 4x4

 

Typical Application Circuit

For Fixed Voltage Regulator

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IN

 

C1

 

R7

 

RT8223A

 

R9

 

 

C9

C8

 

 

3.9

 

 

 

 

 

10µF

 

 

 

16

VIN

UGATE2

10

 

0

Q2

 

10µF

10µF

 

 

 

 

C6

 

 

 

BSC119

 

 

 

 

 

 

 

 

 

 

R8

0

N03S

 

 

 

 

 

 

 

0.1µF

 

 

BOOT2

9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R4 0

 

 

 

 

 

C7

 

 

L2

 

 

 

Q1

21

UGATE1

PHASE2

11

 

0.1µF

 

 

4.7µH

VOUT2

 

 

 

 

 

 

 

 

 

BSC119

 

 

 

 

 

 

 

 

 

 

3.3V

 

 

N03S

R3

0

22

 

 

12

 

 

Q4

 

 

 

 

BOOT1

LGATE2

 

 

 

R10

C13

 

 

 

 

 

 

 

 

 

 

 

C2

 

 

 

 

 

 

 

BSC119

 

220µF

 

L1

 

 

 

 

PGND 15

 

 

N03S

 

C10

 

 

0.1µF

 

 

 

 

 

 

 

OUT1

6.8µH

 

 

 

20

PHASE1

 

 

 

 

 

 

 

 

5V

 

 

 

 

VOUT2

7

 

 

 

 

 

 

C3

R5

Q3

 

 

19

LGATE1

 

 

 

 

 

 

 

 

VREG5

17

 

 

 

5V Always On

 

220µF

 

BSC119

 

 

 

 

 

C5

 

 

 

C4

N03S

 

 

 

 

 

 

 

R6

 

 

 

 

 

 

 

 

 

 

 

4.7µF

 

 

 

 

 

 

 

 

24

 

 

23

 

 

100k

 

 

 

 

 

 

 

 

VOUT1

PGOOD

 

 

 

PGOOD Indicator

 

 

 

C11

 

3 REF

VREG3

8

 

C12

 

3.3V Always On

 

 

 

0.22µF

 

 

 

 

 

 

4.7µF

R1

 

 

 

 

 

Frequency Control

 

 

4 TONSEL

ENTRIP1

1

 

 

150k

 

 

 

 

 

 

 

 

 

R2

 

 

 

 

PWM/DEM/Ultrasonic

 

 

14

SKIPSEL

 

 

 

 

 

 

 

 

 

 

ENTRIP2

6

 

 

150k

 

 

 

 

 

ON

 

 

13

EN

 

 

 

 

 

 

 

 

 

 

GND Exposed Pad (25)

 

 

 

 

 

 

OFF

 

 

2

FB1

 

 

 

 

 

 

 

 

 

5

FB2

 

 

 

 

 

 

 

 

www.richtek.com

DS8223A/B-04 April 2011

2

 

V

 

 

 

 

 

 

 

 

 

 

 

 

RT8223A/B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IN

 

C1

 

R7

 

RT8223B

 

R9

 

 

C13

C12

 

 

3.9

 

 

 

 

 

10uF

 

 

 

16

VIN

UGATE2

10

 

0

Q2

 

10µF

10µF

 

 

 

 

C10

 

 

BSC119

 

 

 

 

 

 

 

 

 

 

R8

0

N03S

 

 

 

 

 

 

 

0.1µF

 

 

BOOT2

9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R4 0

 

 

 

 

 

C7

 

 

L2

 

 

 

Q1

21

UGATE1

PHASE2

11

 

0.1µF

 

 

4.7µH

VOUT2

 

 

 

 

 

 

 

 

 

BSC119

 

 

 

 

 

 

 

 

 

 

3.3V

 

 

N03S

R3

0

22

 

 

12

 

 

Q4

 

 

 

 

BOOT1

LGATE2

 

 

 

R10

C17

 

 

 

 

 

 

 

 

 

 

 

C2

 

 

 

 

15

 

 

BSC119

 

220µF

 

L1

 

 

 

 

PGND

 

 

N03S

 

C14

 

OUT1

6.8µH

 

0.1µF

 

20

PHASE1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5V

 

 

 

 

VOUT2

7

 

 

 

 

 

 

C3

R5

Q3

 

 

19

LGATE1

 

 

 

 

 

 

 

 

VREG5

17

 

 

 

5V Always On

 

220µF

 

BSC119

 

 

 

 

 

C9

 

 

 

C4

N03S

 

 

 

 

 

 

 

R6

 

 

 

 

 

 

 

 

 

 

 

4.7µF

 

 

 

 

 

 

 

 

 

 

 

 

100k

 

 

 

 

 

 

 

 

24

 

 

23

 

 

 

 

 

 

 

 

 

 

VOUT1

PGOOD

 

 

 

PGOOD Indicator

 

 

 

ON

 

18

ENC

VREG3

8

 

C16

 

3.3V Always On

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

3 REF

 

 

 

4.7µF

R1

 

 

 

 

 

 

C15

ENTRIP1

1

 

 

150k

 

 

 

 

 

 

0.22µF

 

 

 

 

 

 

R2

 

 

 

 

 

 

ON

 

13

 

ENTRIP2

6

 

 

150k

 

 

 

 

 

 

 

EN

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FB1

2

 

 

 

 

 

 

 

 

 

 

 

4

TONSEL

 

 

 

 

 

 

 

 

Frequency Control

FB2

5

 

 

 

 

 

 

 

 

 

 

 

14

 

Exposed Pad (25)

 

 

 

 

 

 

PWM/DEM/Ultrasonic

SKIPSEL

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DS8223A/B-04 April 2011

www.richtek.com

 

3

RT8223A/B

For Adjustable Voltage Regulator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IN

 

 

C1

 

R7

 

RT8223A

 

 

R9

 

 

 

C9

C8

 

 

 

 

3.9

 

 

 

 

 

 

 

 

 

10µF

 

 

 

16

VIN

UGATE2

10

 

 

0

 

Q2

 

10µF

10µF

 

 

 

 

 

 

C6

 

 

 

 

 

BSC119

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R8

0

 

N03S

 

 

 

 

 

 

 

 

 

0.1µF

 

BOOT2 9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R4 0

 

 

 

 

 

 

 

C7

 

 

L2

 

 

 

 

 

Q1

21 UGATE1

PHASE2

11

 

 

 

0.1µF

 

 

4.7µH

 

VOUT2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BSC119

 

 

 

 

 

 

 

 

 

 

 

 

 

3.3V

 

 

 

N03S

R3

0

22 BOOT1

LGATE2 12

 

 

 

 

Q4

 

 

 

 

 

 

 

 

 

 

R10

C13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C2

 

 

 

PGND 15

 

 

 

 

BSC119

 

 

220µF

V

 

L1

 

 

 

 

 

 

 

 

N03S

 

C10

 

 

OUT1

6.8µH

0.1µF

 

20 PHASE1

 

 

 

 

 

 

 

 

 

 

 

 

5V

 

 

 

 

VOUT2 7

 

 

 

 

 

 

 

 

 

 

C3

 

Q3

 

 

19

LGATE1

 

 

 

 

 

 

 

 

 

 

R5

 

 

FB2

5

 

 

 

 

 

 

 

R13

C17

 

220µF

BSC119

 

 

 

 

 

R1

 

 

 

 

 

 

 

N03S

 

 

 

 

 

 

 

 

 

 

 

 

6.5k

 

 

 

C4

 

 

 

 

ENTRIP1 1

 

 

150k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24 VOUT1

 

 

 

 

R2

 

 

 

 

R14

0.1µF

 

C14

R11

 

 

 

 

 

ENTRIP2 6

 

 

150k

 

 

 

 

10k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15k

 

 

 

2

FB1

 

Exposed Pad (25)

 

 

 

 

 

 

C15

 

 

 

 

GND

 

 

 

 

 

 

R12

 

 

 

3

REF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.1µF

 

C11

 

 

17

 

 

 

 

 

 

 

 

 

 

10k

 

 

 

 

VREG5

 

 

 

 

5V Always On

 

 

 

 

 

0.22µF

 

 

 

 

 

C5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R6

 

 

 

 

 

 

Frequency Control

 

 

4 TONSEL

 

 

 

 

4.7µF

 

 

 

 

 

 

 

 

 

 

 

 

100k

 

 

 

 

 

 

 

 

PGOOD 23

 

 

 

 

 

 

 

 

 

 

PWM/DEM/Ultrasonic

 

 

14 SKIPSEL

 

 

 

 

PGOOD Indicator

 

 

 

 

ON

 

 

13 EN

VREG3

8

 

 

C12

3.3V Always On

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

 

 

4.7µF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IN

 

 

C1

 

 

R7

RT8223B

 

 

 

R9

 

 

C13

C12

 

 

 

 

 

3.9

 

 

 

 

 

 

 

 

10µF

 

 

 

 

16 VIN

UGATE2

10

 

0

 

Q2

 

10µF

10µF

 

 

 

 

 

 

 

C10

 

 

 

 

BSC119

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R8

0

N03S

 

 

 

 

 

 

 

 

 

 

0.1µF

 

BOOT2 9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R4 0

 

 

 

 

 

 

C7

 

 

L2

 

 

 

 

 

Q1

 

21 UGATE1

PHASE2

11

 

 

0.1µF

 

4.7µH

VOUT2

 

 

 

 

 

 

 

 

 

 

 

 

BSC119

 

 

 

 

 

 

 

 

 

 

 

 

3.3V

 

 

 

N03S

 

R3

0

22 BOOT1

LGATE2 12

 

 

 

Q4

 

 

 

 

 

 

 

 

 

 

 

R10

 

C17

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C2

 

 

 

PGND 15

 

 

 

BSC119

 

 

220µF

 

 

L1

 

 

 

 

 

 

 

N03S

 

C14

 

 

V

 

6.8µH

 

0.1µF

 

 

20 PHASE1

 

 

 

 

 

 

 

 

 

 

 

OUT1

 

 

 

 

 

VOUT2 7

 

 

 

 

 

 

 

 

5V

 

Q3

 

 

 

19 LGATE1

 

 

 

 

 

 

 

 

 

C3

R5

 

 

 

 

 

 

 

 

 

 

 

 

R13

C21

220µF

 

BSC119

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C4

N03S

 

 

 

 

FB2 5

 

 

 

 

 

 

6.5k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R1

 

 

 

 

 

 

 

 

 

 

24 VOUT1

 

 

 

 

 

 

 

 

R14

0.1µF

 

C18

 

 

 

 

 

ENTRIP1 1

 

 

 

150k

 

 

 

 

R11

 

 

 

 

 

 

 

 

R2

 

 

10k

 

 

 

15k

 

 

 

 

2 FB1

 

 

 

 

 

 

 

 

 

 

 

C19

 

 

 

ON

 

ENTRIP2

6

 

 

 

150k

 

 

 

 

 

R12

 

 

 

18 ENC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.1µF

 

 

 

GND Exposed Pad (25)

 

 

 

 

 

 

10k

 

OFF

 

 

 

 

 

 

 

 

 

 

 

 

3 REF

 

 

 

 

 

 

 

 

 

 

 

C15

VREG5 17

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5V Always On

 

 

 

 

 

 

 

0.22µF

 

 

C9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R6

 

 

 

 

 

 

 

 

 

ON

 

 

 

 

 

 

 

4.7µF

 

 

 

 

 

 

 

 

 

 

13 EN

 

 

 

 

 

100k

 

 

 

 

 

 

 

 

 

 

PGOOD 23

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

PGOOD Indicator

 

 

 

 

Frequency Control

4 TONSEL

VREG3 8

 

 

C16

 

3.3V Always On

 

 

 

 

PWM/DEM/Ultrasonic

14 SKIPSEL

 

 

 

 

 

4.7µF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

www.richtek.com

 

 

 

 

 

 

 

 

 

 

 

 

DS8223A/B-04

April 2011

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Richtek RT8223AGQW, RT8223AZQW, RT8223BGQW, RT8223BZQW Schematic

RT8223A/B

Function Block Diagram

 

TONSEL

SKIPSEL

 

BOOT1

 

 

BOOT2

UGATE1

 

 

UGATE2

PHASE1

VREG5

 

PHASE2

 

 

VREG5

 

SMPS1

SMPS2

 

LGATE1

PWM Buck

PWM Buck

LGATE2

Controller

Controller

PGND

 

 

 

VOUT1

 

 

VOUT2

FB1

 

 

FB2

ENTRIP1

 

 

ENTRIP2

EN

Power-On

 

PGOOD

 

 

Sequence

 

 

ENC

 

 

Clear Fault Latch

 

GND

 

 

 

 

SW Threshold

SW Threshold

 

Thermal

 

 

 

Shutdown

 

 

VREG5

 

 

VREG3

 

VREG5

REF

VREG3

VIN

 

 

 

 

 

REF

 

Function Block Diagram

TONSEL VIN

VOUT

 

On-Time

 

TON

Q

R

 

Compute

 

1-Shot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TRIG

 

REF

-

+

 

-

Comp

 

 

+

-

 

+

 

 

 

FB

 

 

Over-Voltage

 

 

1.1 x VREF

+

 

 

Fault

 

 

-

 

 

Latch

 

 

0.6 x VREF

-

 

 

Blanking

 

+

 

 

Time

 

 

 

 

Under-Voltage

 

 

 

 

-

 

 

 

 

 

0.9 x VREF

+

 

 

 

 

PGOOD

 

 

 

 

 

 

 

 

 

 

 

UGATE

 

TRIG

TOFF

 

 

1-Shot

 

 

 

Q

 

 

 

 

 

 

LGATE

 

 

 

 

VREG5

 

 

 

+

ENTRIP

 

 

 

-

 

 

 

 

Current

 

SS

S

+ Limit

 

Time

-

 

 

-

 

 

 

 

+

 

25kHz

 

 

+

PHASE

Detector

Zero

 

-

 

 

Detector

 

 

 

SKIPSEL

 

 

PWM Controller (One Side)

 

 

DS8223A/B-04 April 2011

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5

RT8223A/B

Functional Pin Description

ENTRIP1 (Pin 1)

Channel 1 enable and Current Limit setting Input. Connect a resistor to GND to set the threshold for channel 1 synchronous RDS(ON) sense. The GND − PHASE1 currentlimit threshold is 1/10th the voltage seen at ENTRIP1 over a 0.5V to 2V range. There is an internal 10μA current source from VREG5 to ENTRIP1.

FB1 (Pin 2)

SMPS1 Feedback Input. Connect FB1 to VREG5 or GND for fixed 5V operation. Or connect FB1 to a resistive voltagedivider from VOUT1 to GND to adjust output from 2V to 5.5V.

REF (Pin 3)

2V Reference Output. Bypass to GND with a 0.22μF capacitor. REF can source up to 50μA for external loads. Loading REF degrades FBx and output accuracy according to the REF load regulation error.

TONSEL (Pin 4)

Frequency Selectable Input for VOUT1/VOUT2 respectively.

400kHz/500kHz : Connect to VREG5 or VREG3

300kHz/375kHz : Connect to REF

200kHz/250kHz : Connect to GND

FB2 (Pin 5)

SMPS2 Feedback Input. Connect FB2 to VREG5 or GND for fixed 3.3V operation. Or connect FB2 to a resistive voltage-divider from VOUT2 to GND to adjust output from 2V to 5.5V.

ENTRIP2 (Pin 6)

Channel 2 enable and Current Limit setting Input. Connect a resistor to GND to set the threshold for channel 2 synchronous RDS(ON) sense. The GND − PHASE2 current limit threshold is 1/10th the voltage seen at ENTRIP2 over a 0.5V to 2V range. There is an internal 10μA current source from VREG5 to ENTRIP2.

VOUT2 (Pin 7)

SMPS2 Output Voltage Sense Input. Connect to the SMPS2 output. VOUT2 is an input to the on-time one shot circuit. It also serves as the SMPS2 feedback input in fixed voltage mode.

VREG3 (Pin 8)

3.3V Linear Regulator Output.

BOOT2 (Pin 9)

Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor according to the typical application circuits.

UGATE2 (Pin 10)

High-Side MOSFET Floating Gate Driver Output for SMPS2. UGATE2 swings between PHASE2 and BOOT2.

PHASE2 (Pin 11)

Inductor Connection for SMPS2. PHASE2 is the internal lower supply rail for the UGATE2 high side gate driver. PHASE2 is also the current-sense input for the SMPS2.

LGATE2 (Pin 12)

SMPS2 Synchronous-Rectifier Gate-Drive Output. LGATE2 swings between PGND and VREG5.

EN (Pin 13)

Master Enable Input. The REF/VREG5/VREG3 are enabled if it is within logic high level and disabled if it is less than the logic low level.

SKIPSEL (Pin 14)

Operation Mode Selectable Input.

Ultrasonic Mode : Connect to VREG5 or VREG3

Diode Emulation Mode : Connect to GND

PWM Mode : Connect to REF

GND [Exposed Pad (25)]

Analog Ground for SMPS controller. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation.

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DS8223A/B-04 April 2011

6

 

RT8223A/B

PGND (Pin 15)

Power Ground for SMPS controller. Connect PGND externally to the underside of the exposed pad.

VIN (Pin 16)

High Voltage Power Supply Input for 5V/3.3V LDO and Feed-forward ON-Time circuitry.

VREG5 (Pin 17)

5V Linear Regulator Output.VREG5 is also the supply voltage for the low-side MOSFET driver and analog supply voltage for the device.

NC (Pin 18) (RT8223A)

No Internal Connection.

ENC (Pin 18) (RT8223B)

SMPSx Enable Input. Pull up to VREG3 or VREG5 to turn on both switcher channels. Short to GND to shutdown them.

LGATE1 (Pin 19)

SMPS1 Synchronous RectifierGateDrive Output. LGATE1 swings between PGND and VREG5.

PHASE1 (Pin 20)

Inductor Connection for SMPS1. PHASE1 is the internal lower supply rail for the UGATE1 high side gate driver. PHASE1 is also the current sense input for the SMPS1.

UGATE1 (Pin 21)

High-Side MOSFET Floating Gate Driver Output for SMPS1. UGATE1 swings between PHASE1 and BOOT1.

BOOT1 (Pin 22)

Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor according to the typical application circuits.

PGOOD (Pin 23)

Power Good Output for channel 1 and channel 2. (Logical AND)

VOUT1 (Pin 24)

SMPS1 Output Voltage-Sense Input. Connect to the SMPS1 output. VOUT1 is an input to the on-time one shot circuit. It also serves as the SMPS1 feedback input in fixed-voltage mode.

DS8223A/B-04 April 2011

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7

RT8223A/B

Absolute Maximum Ratings (Note 1)

z VIN, EN to GND --------------------------------------------------------------------------------------------------------------

–0.3V to 30V

z PHASEx to GND

 

DC -------------------------------------------------------------------------------------------------------------------------------

–0.3V to 30V

< 20ns -------------------------------------------------------------------------------------------------------------------------

−8V to 38V

z BOOTx to PHASEx ---------------------------------------------------------------------------------------------------------

–0.3V to 6V

z ENTRIPx, SKIPSEL, TONSEL, PGOOD, to GND -------------------------------------------------------------------

–0.3V to 6V

z VREG5, VREG3, FBx, VOUTx, ENC, REF to GND ----------------------------------------------------------------

–0.3V to 6V

z UGATEx to PHASEx

 

DC -------------------------------------------------------------------------------------------------------------------------------

–0.3V to 6V

< 20ns -------------------------------------------------------------------------------------------------------------------------

−5V to 7.5V

z LGATEx to GND

 

DC -------------------------------------------------------------------------------------------------------------------------------

–0.3V to 6V

< 20ns -------------------------------------------------------------------------------------------------------------------------

−2.5V to 7.5V

z Power Dissipation, PD @ TA = 25°C

 

WQFN-24L 4x4 --------------------------------------------------------------------------------------------------------------

1.923W

z Package Thermal Resistance (Note 2)

 

WQFN-24L 4x4, θJA ---------------------------------------------------------------------------------------------------------

52°C/W

WQFN-24L 4x4, θJC --------------------------------------------------------------------------------------------------------

7°C/W

z Lead Temperature (Soldering, 10 sec.) ---------------------------------------------------------------------------------

260°C

z Junction Temperature -------------------------------------------------------------------------------------------------------

150°C

z Storage Temperature Range ----------------------------------------------------------------------------------------------

–65°C to 150°C

z ESD Susceptibility (Note 3)

 

HBM (Human Body Mode) ------------------------------------------------------------------------------------------------

2kV

MM (Machine Mode) --------------------------------------------------------------------------------------------------------

200V

Recommended Operating Conditions

(Note 4)

z Input Voltage, VIN ------------------------------------------------------------------------------------------------------------

6V to 25V

z Junction Temperature Range ----------------------------------------------------------------------------------------------

40°C to 125°C

z Ambient Temperature Range ----------------------------------------------------------------------------------------------

40°C to 100°C

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DS8223A/B-04 April 2011

8

 

RT8223A/B

Electrical Characteristics

(VIN = 12V, EN = ENC = 5V, ENTRIP1 = ENTRIP2 = 2V, No Load on VREG5, VREG3, VOUT1, VOUT2 and REF, TA = 25°C, unless otherwise specified)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

 

 

 

 

 

 

 

 

 

Input Supply

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VIN Standby Supply

IVIN_SBY

VIN = 6V to 25V, Both SMPS Off,

--

200

--

μA

Current

EN = 5V, ENC = GND

 

 

 

 

 

 

 

VIN Shutdown Supply

IVIN_SHDH

VIN = 6V to 25V, ENTRIPx = EN = GND

--

20

40

μA

Current

 

 

 

 

 

 

 

 

Quiescent Power

 

Both SMPSs On, FBx = SKIPSEL = REF

--

5

7

mW

Consumption

 

VOUT1 = 5.3V, VOUT2 = 3.5V

(Note 5)

 

 

 

 

 

SMPS Output and FB Voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOUT1 Output Voltage in

VOUT1

VIN = 6V to 25V, FB1= REF or 5V,

4.975

5.05

5.125

V

Fixed Mode

SKIPSEL = REF

 

 

 

 

 

 

 

 

 

VOUT2 Output Voltage in

VOUT2

VIN = 6V to 25V, FB2 = REF or 5V,

3.285

3.33

3.375

V

Fixed Mode

SKIPSEL = REF

 

 

FBx in Output Adjustable

FBx

VIN = 6V to 25V

 

 

1.975

2

2.025

V

Mode

 

 

 

 

 

 

 

 

 

 

Output Voltage

VOUTx

SMPS1, SMPS2

 

 

2

--

5.5

V

Adjustment Range

 

 

 

 

 

 

 

 

 

 

FBx Adjustable-mode

 

Fixed or Adj-Mode comparator threshold

0.2

0.4

0.55

V

Threshold Voltage

 

 

 

 

 

 

 

 

 

DC Load Regulation

VLOAD

Either SMPS, SKIPSEL = REF, 0 to 5A

--

−0.1

--

%

Either SMPS, SKIPSEL = VREG5, 0 to 5A

--

−1.7

--

 

 

Either SMPS, SKIPSEL = GND, 0 to 5A

--

−1.5

--

 

Line Regulation

VLINE

Either SMPS, VIN = 6V to 25V

--

0.005

--

%/V

On Time

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TONSEL = GND

VOUT1 = 5.05V

1895

2105

2315

 

 

 

VOUT2

= 3.33V

999

1110

1221

 

 

 

 

 

On-Time Pulse Width

tUGATEx

TONSEL = REF

VOUT1 = 5.05V

1227

1403

1579

ns

VOUT2

= 3.33V

647

740

833

 

 

 

 

 

 

TONSEL = VREG5

VOUT1 = 5.05V

895

1052

1209

 

 

 

VOUT2 = 3.33V

475

555

635

 

 

 

 

 

Minimum Off-Time

tLGATEx

 

 

 

200

300

400

ns

Ultrasonic Mode

 

SKIPSEL = VREG5 or VREG3

20

28

--

kHz

Frequency

 

 

 

 

 

 

 

 

 

Soft Start

 

 

 

 

 

 

 

 

Soft-Start Time

tSSx

Zero to Full Limit from ENTRIPx Enable

--

2

--

ms

Current Sense

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Current Limit Threshold

 

VENTRIPx = VREG5, GND−PHASEx

180

200

220

mV

(Default)

 

 

 

 

 

 

 

 

 

ENTRIPx Source Current

IENTRIPx

VENTRIPx = 0.9V

 

 

9.4

10

10.6

μA

ENTRIPx Current

TCIENTRIPx

 

 

 

--

1600

--

PPM/°C

Temperature Coefficient

 

 

 

 

 

 

 

 

 

 

 

ENTRIPx Adjustment

 

VENTRIPx = IENTRIPx x RENTRIPx

0.5

--

2

V

Range

 

 

 

 

 

 

 

 

 

 

To be continued

 

 

DS8223A/B-04 April 2011

www.richtek.com

 

9

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