Richtek RT8223PZQW Schematic [ru]

RT8223P

High Efficiency, Main Power Supply Controller for Notebook Computer

General Description

The RT8223P is a dual step-down, switch-mode power supply controller generating logic-supply voltages in battery-powered systems. It includes two Pulse Width Modulation (PWM) controllers adjustable from 2V to 5.5V, and also features fixed 5V/3.3V linear regulators. Each linear regulator provides up to 100mA output current with automatic linear regulator bootstrapping to the PWM outputs. The RT8223P includes on-board power up sequencing, a power good output, internal soft-start, and soft-discharge output that prevents negative voltage during shutdown.

The constant on-time PWM scheme can operate without sense resistors and provide 100ns load transient response while maintaining nearly constant switching frequency. To eliminate noise in audio applications, an ultrasonic mode is included, which maintains the switching frequency above 25kHz. Moreover, the diode-emulation mode maximizes efficiency for light load applications. The RT8223P is available in a WQFN-24L 4x4 package.

Features

zConstant On-time Control with 100ns Load Step Response

zWide Input Voltage Range : 6V to 25V

zDual Adjustable Outputs from 2V to 5.5V

zFixed 3.3V and 5V LDO Output : 100mA

z2V Reference Voltage

zFrequency Selectable via TONSEL Setting

z4700ppm/°C RDS(ON) Current Sensing

zProgrammable 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

Ordering Information		Pin Configurations
RT8223P
	Package Type			(TOP VIEW)
	QW : WQFN-24L 4x4 (W-Type)			VOUT1	PGOOD	BOOT1	UGATE1	PHASE1	LGATE1
	Z : ECO (Ecological Element with
	Lead Plating System
Note :	Halogen Free and Pb free)			24	23	22	21	20 19
		ENTRIP1	1						18	ENC
Richtek products are :		FB1	2						17	VREG5
` RoHS compliant and compatible with the current require-		REF	3			GND			16	VIN
		TONSEL	4						15	GND
ments of IPC/JEDEC J-STD-020.		FB2	5					25	14	SKIPSEL
` Suitable for use in SnPb or Pb-free soldering processes.		ENTRIP2	6						13	EN
				7	8	9	10	11	12
Marking Information				VOUT2	VREG3	BOOT2	UGATE2	PHASE2	LGATE2
	20 : Product Code
20 YM	YMDNN : Date Code			WQFN-24L 4x4
DNN

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RT8223P

Typical Application Circuit

VIN

R8

6V to 25V

C1

RT8223P

R10

C13

C12

3.9

10µF

16

VIN

UGATE2 10

0

Q2

10µF

10µF

C10

BSC119

0

N03S

0.1µF

BOOT2

9

R

BOOT2

C11

L2

R4

0

Q1

21 UGATE1

PHASE2

11

0.1µF

4.7µH

VOUT2

BSC119

3.3V

N03S

0

22 BOOT1

12

Q4

LGATE2

R11

C17

R

BSC119

220µF

L1

C2

BOOT1

GND

15

N03S

C14

V

6.8µH

0.1µF

OUT1

20 PHASE1

5V

VOUT2

7

C3

Q3

19

LGATE1

R5

FB2

5

R14

C21

220µF

BSC119

R

N03S

ILIM1

6.5k

C4

1

150k

ENTRIP1

C20

24 VOUT1

RILIM2

R15

0.1µF

C18

R12

6

150k

10k

ENTRIP2

15k

2 FB1

25 (Exposed Pad)

C19

GND

R13

VREF

3 REF

0.1µF

C15

10k

2V

0.22µF

VREG5

17

Frequency Control

4 TONSEL

C9

R6

5V Always On

PWM/DEM/Ultrasonic

14 SKIPSEL

4.7µF

PGOOD

23

100k

PGOOD Indicator

ON

13 EN

VREG3

8

3.3V Always On

OFF

C16

ON

18

4.7µF

ENC

OFF

Functional Pin Description

	Pin No.	Pin Name	Pin Function
			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
	1	ENTRIP1	current limit threshold is 1/10th the voltage seen at ENTRIP1 over a 0.515V to 3V
			range. There is an internal 10μA current source from VREG5 to ENTRIP1. Leave
			ENTRIP1 floating or short ENTRIP1 to GND to shut down channel 1.
	2	FB1	SMPS1 Feedback Input. Connect FB1 to a resistive voltage divider from VOUT1
			to GND to adjust output from 2V to 5.5V.
			2V Reference Output. Bypass to GND with a minimum 0.22μF capacitor. REF can
	3	REF	source up to 100μA for external loads. Loading REF degrades FBx and output
			accuracy according to the REF load-regulation error.
			Frequency Selectable Input for VOUT1/VOUT2 respectively.
	4	TONSEL	400kHz/500kHz : Connect to VREG5 or VREG3
			300kHz/375kHz : Connect to REF
			200kHz/250kHz : Connect to GND
	5	FB2	SMPS2 Feedback Input. Connect FB2 to a resistive voltage divider from VOUT2
			to GND to adjust output voltage from 2V to 5.5V.
			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
	6	ENTRIP2	current limit threshold is 1/10th the voltage seen at ENTRIP2 over a 0.515V to 3V
			range. There is an internal 10μA current source from VREG5 to ENTRIP2. Leave
			ENTRIP2 floating or short ENTRIP2 to GND to shut down channel 2.
	7	VOUT2	Bypass Pin for SMPS2. Connect to the SMPS2 output to bypass efficient power
			for VREG3 pin. VOUT2 is also for the SMPS2 output soft-discharge.
	8	VREG3	3.3V Linear Regulator Output.

	To be continued
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RT8223P

	Pin No.	Pin Name	Pin Function
	9	BOOT2	Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor
			according to the typical application circuits.
	10	UGATE2	Upper Gate Driver Output for SMPS2. UGATE2 swings between PHASE2 and
			BOOT2.
			Switch Node for SMPS2. PHASE2 is the internal lower supply rail for the
	11	PHASE2	UGATE2 high side gate driver. PHASE2 is also the current-sense input for the
			SMPS2.
	12	LGATE2	Lower Gate Driver Output for SMPS2. LGATE2 swings between GND and
			VREG5.
	13	EN	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.
			Operation Mode Selectable Input.
	14	SKIPSEL	Connect to VREG5 or VREG3 : Ultrasonic Mode
			Connect to REF : PWM Mode
			Connect to GND : DEM Mode
	16	VIN	Supply Input for 5V/3.3V LDO and Feed Forward On-Time circuitry.
	17	VREG5	5V Linear Regulator Output. VREG5 is also the supply voltage for the lower gate
			driver and analog supply voltage for the device.
	18	ENC	SMPS Enable Input. Pull up to VREG3 or VREG5 to turn on both switch channels.
			Short to GND to shutdown them.
	19	LGATE1	Lower Gate Driver Output for SMPS1. LGATE1 swings between GND and
			VREG5.
			Switch Node for SMPS1. PHASE1 is the internal lower supply rail for the
	20	PHASE1	UGATE1 high side gate driver. PHASE1 is also the current-sense input for the
			SMPS1.
	21	UGATE1	Upper Gate Driver Output for SMPS1. UGATE1 swings between PHASE1 and
			BOOT1.
	22	BOOT1	Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor
			according to the typical application circuits.
	23	PGOOD	Power Good Output for Channel 1 and Channel 2. (Logical AND).
	24	VOUT1	Bypass Pin for SMPS1. Connect to the SMPS1 output to bypass efficient power
			for VREG5 pin. VOUT1 is also for the SMPS1 output soft-discharge.
	15, 25	GND	Ground for SMPS Controller. The exposed pad must be soldered to a large PCB
	(Exposed Pad)		and connected to GND for maximum power dissipation.

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RT8223P

Function Block Diagram

		TONSEL SKIPSEL
BOOT1
					BOOT2
UGATE1
PHASE1					UGATE2
	VREG5				PHASE2
				VREG5
LGATE1		SMPS1	SMPS2
	VREG5	PWM Buck
			PWM Buck		LGATE2
		Controller		VREG5
			Controller
	10µA			10µA
FB1					VOUT2
ENTRIP1
					FB2
EN		Power-On			ENTRIP2
					PGOOD
		Sequence
ENC
	Clear Fault Latch
	SW5 Threshold		SW3 Threshold		GND
VOUT1
		Thermal
		Shutdown
VREG5					VREG3
	VREG5		REF	VREG3
VIN
			REF

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	RT8223P
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 (VREG5 + 0.3V)
< 20ns-----------------------------------------------------------------------------------------------------------	−5V to 7.5V
z LGATEx to GND
DC ----------------------------------------------------------------------------------------------------------------	−0.3V to (VREG5 + 0.3V)
< 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 Supply Voltage, VIN ------------------------------------------------------------------------------------------	6V to 25V
z Junction Temperature Range -------------------------------------------------------------------------------	−40°C to 125°C
z Ambient Temperature Range -------------------------------------------------------------------------------	−40°C to 85°C

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RT8223P

Electrical Characteristics

(VIN = 12V, VEN = VENC = 5V, VENTRIP1 = VENTRIP2 = 2V, No Load, TA = 25°C, unless otherwise specified)

	Parameter	Symbol	Test Conditions			Min	Typ	Max	Unit
	Input Supply
	VIN Standby Current	IVIN_SBY	VIN = 6V to 25V, ENTRIPx = GND			--	200	--	μA
	VIN Shutdown Supply	IVIN_SHDN	VIN = 6V to 25V,			--	20	40	μA
	Current		ENTRIPx = EN = GND
	Quiescent Power	PVIN	Both SMPS On, VFBx = 2.1V,
			SKIPSEL = GND, VOUT1 = 5V, VOUT2 = 3.3V			--	5	7	mW
	Consumption	+PPVCC
			(Note 5)
	SMPS Output and FB Voltage
			DEM Mode			1.975	2	2.025
	FBx Voltage	VFBx	PWM Mode (Note 6)			--	2	--	V
			Ultrasonic Mode			--	2.032	--
	Output Voltage Adjust	VOUTx	SMPS1, SMPS2			2	--	5.5	V
	Range
	VOUTx Discharge		VOUTx = 0.5V, VENTRIPx = 0V			10	45	--	mA
	Current
	On-Time
			TONSEL = GND	VOUT1 = 5.05V (200kHz)		1895	2105	2315
				VOUT2	= 3.33V (250kHz)	999	1110	1221
	On-Time Pulse Width	tON	TONSEL = REF	VOUT1 = 5.05V (300kHz)		1227	1403	1579	ns
				VOUT2	= 3.33V (375kHz)	647	740	833
			TONSEL = REG5	VOUT1 = 5.05V (400kHz)		895	1052	1209
				VOUT2 = 3.33V (500kHz)		475	555	635
	Minimum Off-Time	tOFF	VFBx = 1.9V			200	300	400	ns
	Ultrasonic Mode		SKIPSEL = VREG5 or VREG3			22	33	--	kHz
	Frequency
	Soft-Start
	Soft-Start Time	tSSx	Internal Soft-Start			--	2	--	ms
	Current Sense
	ENTRIPx Source	IENTRIPx	VENTRIPx = 0.9V			9.4	10	10.6	μA
	Current
	ENTRIPx Current
	Temperature	TCIENTRIPx	In Comparison with 25°C		(Note 6)	--	4700	--	ppm/°C
	Coefficient
	ENTRIPx Adjustment		VENTRIPx = IENTRIPx x RENTRIPx			0.515	--	3	V
	Range
	Current Limit		GND − PHASEx, VENTRIPx = 2V			180	200	220	mV
	Threshold
	Zero-Current		GND − PHASEx in DEM			--	3	--	mV
	Threshold

To be continued

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RT8223P

	Parameter	Symbol		Test Conditions	Min	Typ	Max	Unit
	Internal Regulator and Reference
			VOUT1 = GND, IVREG5 < 100mA		4.8	5	5.2
	VREG5 Output Voltage	VVREG5	VOUT1 = GND, 6.5V < VIN < 25V,		4.75	5	5.25	V
			IVREG5 < 100mA
			VOUT1 = GND, 5.5V < VIN < 25V,		4.75	5	5.25
			IVREG5 < 50mA
			VOUT2 = GND, IVREG3 < 100mA		3.2	3.33	3.46
	VREG3 Output Voltage	VVREG3	VOUT2 = GND, 6.5V < VIN < 25V,		3.13	3.33	3.5	V
			I	< 100mA
			VREG3
			VOUT2 = GND, 5.5V < VIN < 25V,		3.13	3.33	3.5
			IVREG3 < 50mA
	VREG5 Output Current	IVREG5	VVREG5 = 4.5V, VOUT1 = GND		100	175	250	mA
	VREG3 Output Current	IVREG3	VVREG3 = 3V, VOUT2 = GND		100	175	250	mA
	VREG5 Switch-over	VSW5	VOUT1 Rising Edge		4.6	4.75	4.9	V
	Threshold to VOUT1		VOUT1 Falling Edge		4.3	4.4	4.5
	VREG3 Switch-over	VSW3	VOUT2 Rising Edge		2.975	3.125	3.25	V
	Threshold to VOUT2		VOUT2 Falling Edge		2.775	2.875	2.975
	VREGx Switch-over	RSWx	VREGx to VOUTx, 10mA		--	1.5	3	Ω
	Equivalent Resistance
	REF Output Voltage	VREF	No External Load		1.98	2	2.02	V
	REF Load Regulation		0 < ILOAD < 100μA		--	10	--	mV
	REF Sink Current		REF in Regulation		5	--	--	μA
	UVLO
	VREG5 Under Voltage		Rising Edge		--	4.2	4.45	V
	Lockout Threshold		Falling Edge		3.7	3.9	4.1
	VREG3 Under Voltage		SMPSx off		--	2.5	--	V
	Lockout Threshold
	Power Good
	PGOOD Threshold		PGOOD Detect, FBx falling Edge		82	85	88	%
			Hysteresis, Rising Edge with SS Delay		--	6	--
			Time
	PGOOD Propagation		Falling Edge, 50mV Overdrive		--	10	--	μs
	Delay
	PGOOD Leakage Current		High State, Forced to 5.5V		--	--	1	μA
	PGOOD Output Low		ISINK = 4mA		--	--	0.3	V
	Voltage
	Fault Detection
	Over Voltage Protection	VFB_OVP	OVP Detect, FBx Rising Edge		109	112	116	%
	Trip Threshold
	Over Voltage Protection		FBx = 2.35V		--	5	--	μs
	Propagation Delay
	Under Voltage Protection	VFB_UVP	UVP Detect, FBx Falling Edge		49	52	56	%
	Trip Threshold
							To be continued
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RT8223P

Parameter			Symbol	Test Conditions	Min	Typ	Max	Unit
UVP Shutdown Blanking Time			tSHDN_UVP	From ENTRIPx Enable	--	5	--	ms
Thermal Shutdown
Thermal Shutdown			TSHDN		--	150	--	°C
Thermal Shutdown Hysteresis					--	10	--	°C
Logic Input
				Low Level (DEM Mode)	--	--	0.8
SKIPSEL Input Voltage								V
				REF Level (PWM Mode)	1.8	--	2.3
				High Level (Ultrasonic Mode)	2.7	--	--
				Low Level (SMPS Off)	--	--	0.25
ENTRIPx Input Voltage			VENTRIPx	On Level (SMPS On)	0.515	--	3	V
				High Level (SMPS Off)	4.5	--	--
ENTRIPx Low Level Threshold				Rising Edge	--	0.4	0.515	V
				Falling Edge	0.25	0.36	--
EN Threshold		Logic-High	VIH		2.4	--	--	V
Voltage		Logic-Low	VIL		--	--	0.4
EN Voltage			VEN	Floating, Default Enable	2.4	3.3	4.2	V
EN Current			IEN	VEN = 0.2V, Source	1.5	3	5	μA
				VEN = 5V, Sink	--	3	8
ENC Threshold		Logic-High	VIH_ENC		2	--	--	V
Voltage		Logic-Low	VIL_ENC		--	--	0.6
				VOUT1 / VOUT2 = 200kHz/250kHz	--	--	0.8
TONSEL Setting Voltage				VOUT1 / VOUT2 = 300kHz/375kHz	1.8	--	2.3	V
				VOUT1 / VOUT2 = 400kHz/500kHz	2.7	--	--
Input Leakage Current				VTONSEL, VSKIPSEL = 0V or 5V	−1	--	1	μA
				VENC = 0V or 5V	−1	--	1
Internal BOOT Switch
Internal Boost Switch				VREG5 to BOOTx, 10mA	--	40	80	Ω
On-Resistance
Power MOSFET Drivers
				UGATEx, High State,	--	4	8
UGATEx On-Resistance				BOOTx to PHASEx Forced to 5V				Ω
				UGATEx, Low State,	--	1.5	4
				BOOTx to PHASEx Forced to 5V
LGATEx On-Resistance				LGATEx, High State	--	4	8	Ω
				LGATEx, Low State	--	1.5	4
Dead Time				LGATEx Rising	--	30	--	ns
				UGATEx Rising	--	40	--

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