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

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
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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

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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

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DS8223A/B-04

April 2011

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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)
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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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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.

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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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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
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