Richtek RT8168BGQW Schematic [ru]

RT8168B

Dual Single-Phase PWM Controller for CPU and GPU Core Power Supply

General Description

The RT8168B is a dual single-phase PWM controller with integrated MOSFET drivers, compliant with Intel IMVP7 Pulse Width Modulation Specification to support both CPU core andGPU core power. This part adoptsG-NAVPTM (Green-NativeAVP), which is a Richtek proprietary topology derived from finite DC gain compensator in constant ontime control mode. G-NAVPTM makes this part an easy setting PWM controller to meet all Intel AVP (Active Voltage Positioning) mobile CPU/GPU requirements. The RT8168B uses SVID interface to control an 8-bit DAC for output voltage programming. The built-in high accuracy DAC converts the received VID code into a voltage value ranging from 0V to 1.52V with 5mV step voltage. The system accuracy of the controller can reach 0.8%. The RT8168B operates in continuous conduction mode or diode emulation mode, according to the SVID command. The maximum efficiency can reach up to 90% in different operating modes according to different load conditions. The droop function (load line) can be easily programmed by setting the DC gain of the error amplifier. With proper compensation, the load transient response can achieve optimized AVP performance.

The output voltage transition slew rate is set via the SVID interface. The RT8168B supports both DCR and sense resistor current sensing. The RT8168B provides VR_READY and thermal throttling output signals for IMVP7 CPU and GPU core. This part also features complete fault protection functions including over voltage, under voltage, negative voltage, over current and thermal shutdown.

The RT8168B is available in a WQFN-40L 5x5 small footprint package.

Features

zDual Single-Phase PWM Controller for CPU Core and GPU Core Power

zIMVP7 Compatible Power Management States

zSerial VID Interface

zG-NAVPTM Topology

zAVP for CPU VR Only

z0.5% DAC Accuracy

z0.8% System Accuracy

zDifferential Remote Voltage Sensing

zBuilt-in ADC for Platform Programming

`SETINI/SETINIA for CPU/GPU Core VR Initial Startup Voltage

`TMPMAX to Set Platform Maximum Temperature

`ICCMAX/ICCMAXA for CPU/GPU Core VR Maximum Current

zPower Good Indicator : VR_READY/VRA_READY for CPU/GPU Core Power

zThermal Throttling Indicator : VRHOT

zDiode Emulation Mode at Light Load Condition

zFast Line/Load Transient Response

zSwitching Frequency up to 1MHz per Phase

zOVP, UVP, NVP, OTP, UVLO, OCP

zSmall 40-Lead WQFN Package

zRoHS Compliant and Halogen Free

Applications

zIMVP7 Intel CPU/GPU Core Power Supply

zLaptop Computers

zAVP Step-Down Converter

DS8168B-00 November 2011	www.richtek.com
	1

RT8168B

Ordering Information	Pin Configurations
RT8168B	(TOP VIEW)

	Package Type			UGATE1	PHASE1 LGATE1	PVCC LGATEA PHASEA UGATEA	BOOTA EN	TONSETA
	Lead Plating System
	QW : WQFN-40L 5x5 (W-Type)
Note :	G : Green (Halogen Free and Pb Free)			40 39 38 37 36 35 34			33 32 31
		BOOT1	1					30	ISENAP
Richtek products are :		TONSET	2					29	ISENAN
		ISEN1P	3					28	COMPA
` RoHS compliant and compatible with the current require-
		ISEN1N	4					27	FBA
ments of IPC/JEDEC J-STD-020.		COMP	5			GND		26	RGNDA
		FB	6					25	VCLK
` Suitable for use in SnPb or Pb-free soldering processes.
		RGND	7					24	VDIO
		GFXPS2	8				41	23	ALERT
		VCC	9					22	VRA_READY
Marking Information				11 12 13 14 15 16 17
		SETINIA 10					18 19 20		VR_READY
								21
	RT8168BGQW : Product Number			SETINI	TMPMAX ICCMAX	ICCMAXA TSEN OCSET TSENA	OCSETA IBIAS	VRHOT
RT8168B	YMDNN : Date Code
GQW
YMDNN						WQFN-40L 5x5

www.richtek.com

DS8168B-00 November 2011

2

RT8168B

Typical Application Circuit

R1

VCC

RT8168B

R2

R3

5V

2.2

9

VCC

TONSET

2

130k

5.1

C1

C2

1µF

0.1µF

V

R4

0

Q1

CCP

R7

UGATE1

40

R6

R8

R9

R10

R11

BOOT1

1

R5

0

C4

0.1µF

130

130

150

10k

10k

75

25

VCLK

PHASE1

39

VCLK

24

VDIO

VDIO

38

R12

0

Q2

23

LGATE1

ALERT

ALERT

22

VRA_READY

VRA_READY

37

21

VR_READY

VR_READY

PVCC

5V

20

VRHOT

VRHOT

C8

1µF

V
CC
R17	R18	R19	R20
27k	8.7k	10k	10k
OCSETA			18	OCSETA
			16
OCSET				OCSET
			10
SETINIA				SETINIA
			11
SETINI				SETINI
R24	R25	R26	R27
10k	10k	NC	NC

	ISEN1P	3
		4
	ISEN1N
	FB	6
	COMP	5
		7
	RGND

Optional	Optional
C10	C11
R21	R22
71k	10k

						R33		R34
V				TONSETA	31	130k		5.1
CC								C12
R29	R30	R31	R32					0.1µF
						R35	0	Q3
51k	150k	100k	NC	UGATEA	34

TMPMAX			12	TMPMAX			R36	0
			13			33			C13
ICCMAX				ICCMAX	BOOTA
			14						0.1µF
ICCMAXA				ICCMAXA
			8			35
				GFXPS2
GFXPS2					PHASEA
R37	R38	R39	R40		LGATEA	36	R41	0	Q4
33k	5.1k	1.6k	10k

VCC

R46	NTC		NTC
		R47		TA
	T1		10k
12k	10k	12k
			ß = 3380
	ß = 3380
	R71	R72
	750	750		17	TSENA
				15
					TSEN
				19
	R52	R53			IBIAS
	1k		R54
		1k
			53.6k
	Chip Enable			32	EN

	ISENAP 30
	ISENAN	29
	FBA	27	Optional	Optional
			C19	C20
	COMPA	28	R48	R49
		26	42k	10k
	RGNDA
	GND	41	(Exposed Pad)

			V
			IN
			5V to 25V
C3
10µF
	DCR = 7.6m				V
			L1		CORE
Optional		1µH
R13					C5	C26
	R14		C6		330µF	330µF
						/9m
			0.068µF		/9m
C7	3.9k
				R15	NTC
					1
			R16	4.7k	4.7k
			2.4k		ß = 3500
	C9	Optional
			CORE V	SENSE
			CC
R23			VCORE
100
			CORE VSS	SENSE
	R28
	100
			V
			IN
			5V to 25V
C14
10µF

		DCR = 14.6m
				L2
	Optional		2µH
	R42	R43		C16
				0.1µF
		11k
	C15
				R45
				1.2k

					V
					GFX
					C17						C27
					330µF						330µF
					/15m						/15m
R44					NTC	A
1k					1k
					ß = 3650

	C18	Optional
		GFX V	SENSE
		CC
R50		V
100		GFX
		GFX V	SENSE
		SS
	R51
	100

DS8168B-00 November 2011	www.richtek.com
	3

RT8168B

Table 1. IMVP7/VR12 Compliant VID Table

VID7	VID6	VID5	VID4	VID3	VID2	VID1	VID0	H1	H0	VDAC Voltage
0	0	0	0	0	0	0	0	0	0	0.000
0	0	0	0	0	0	0	1	0	1	0.250
0	0	0	0	0	0	1	0	0	2	0.255
0	0	0	0	0	0	1	1	0	3	0.260
0	0	0	0	0	1	0	0	0	4	0.265
0	0	0	0	0	1	0	1	0	5	0.270
0	0	0	0	0	1	1	0	0	6	0.275
0	0	0	0	0	1	1	1	0	7	0.280
0	0	0	0	1	0	0	0	0	8	0.285
0	0	0	0	1	0	0	1	0	9	0.290
0	0	0	0	1	0	1	0	0	A	0.295
0	0	0	0	1	0	1	1	0	B	0.300
0	0	0	0	1	1	0	0	0	C	0.305
0	0	0	0	1	1	0	1	0	D	0.310
0	0	0	0	1	1	1	0	0	E	0.315
0	0	0	0	1	1	1	1	0	F	0.320
0	0	0	1	0	0	0	0	1	0	0.325
0	0	0	1	0	0	0	1	1	1	0.330
0	0	0	1	0	0	1	0	1	2	0.335
0	0	0	1	0	0	1	1	1	3	0.340
0	0	0	1	0	1	0	0	1	4	0.345
0	0	0	1	0	1	0	1	1	5	0.350
0	0	0	1	0	1	1	0	1	6	0.355
0	0	0	1	0	1	1	1	1	7	0.360
0	0	0	1	1	0	0	0	1	8	0.365
0	0	0	1	1	0	0	1	1	9	0.370
0	0	0	1	1	0	1	0	1	A	0.375
0	0	0	1	1	0	1	1	1	B	0.380
0	0	0	1	1	1	0	0	1	C	0.385
0	0	0	1	1	1	0	1	1	D	0.390
0	0	0	1	1	1	1	0	1	E	0.395
0	0	0	1	1	1	1	1	1	F	0.400
0	0	1	0	0	0	0	0	2	0	0.405
0	0	1	0	0	0	0	1	2	1	0.410
0	0	1	0	0	0	1	0	2	2	0.415

	To be continued
www.richtek.com	DS8168B-00 November 2011

4

											RT8168B
VID7		VID6	VID5	VID4	VID3	VID2	VID1	VID0	H1	H0		DAC Voltage
0		0	1	0	0	0	1	1	2	3		0.420
0		0	1	0	0	1	0	0	2	4		0.425
0		0	1	0	0	1	0	1	2	5		0.430
0		0	1	0	0	1	1	0	2	6		0.435
0		0	1	0	0	1	1	1	2	7		0.440
0		0	1	0	1	0	0	0	2	8		0.445
0		0	1	0	1	0	0	1	2	9		0.450
		0								A
0			1	0	1	0	1	0	2			0.455
0		0	1	0	1	0	1	1	2	B		0.460
0		0	1	0	1	1	0	0	2	C		0.465
0		0	1	0	1	1	0	1	2	D		0.470
0		0	1	0	1	1	1	0	2	E		0.475
0		0	1	0	1	1	1	1	2	F		0.480
0		0	1	1	0	0	0	0	3	0		0.485
0		0	1	1	0	0	0	1	3	1		0.490
0		0	1	1	0	0	1	0	3	2		0.495
0		0	1	1	0	0	1	1	3	3		0.500
0		0	1	1	0	1	0	0	3	4		0.505
0		0	1	1	0	1	0	1	3	5		0.510
0		0	1	1	0	1	1	0	3	6		0.515
0		0	1	1	0	1	1	1	3	7		0.520
0		0	1	1	1	0	0	0	3	8		0.525
0		0	1	1	1	0	0	1	3	9		0.530
0		0	1	1	1	0	1	0	3	A		0.535
0		0	1	1	1	0	1	1	3	B		0.540
0		0	1	1	1	1	0	0	3	C		0.545
0		0	1	1	1	1	0	1	3	D		0.550
0		0	1	1	1	1	1	0	3	E		0.555
0		0	1	1	1	1	1	1	3	F		0.560
0		1	0	0	0	0	0	0	4	0		0.565
0		1	0	0	0	0	0	1	4	1		0.570
0		1	0	0	0	0	1	0	4	2		0.575
0		1	0	0	0	0	1	1	4	3		0.580
0		1	0	0	0	1	0	0	4	4		0.585
0		1	0	0	0	1	0	1	4	5		0.590
												To be continued
DS8168B-00		November 2011										www.richtek.com
											5

RT8168B

VID7	VID6	VID5	VID4	VID3	VID2	VID1	VID0	H1		H0	DAC Voltage
0	1	0	0	0	1	1	0	4		6	0.595
0	1	0	0	0	1	1	1	4		7	0.600
0	1	0	0	1	0	0	0	4		8	0.605
0	1	0	0	1	0	0	1	4		9	0.610
0	1	0	0	1	0	1	0	4		A	0.615
0	1	0	0	1	0	1	1	4		B	0.620
0	1	0	0	1	1	0	0	4		C	0.625
0	1	0	0	1	1	0	1	4		D	0.630
0	1	0	0	1	1	1	0	4		E	0.635
0	1	0	0	1	1	1	1	4		F	0.640
0	1	0	1	0	0	0	0	5		0	0.645
0	1	0	1	0	0	0	1	5		1	0.650
0	1	0	1	0	0	1	0	5		2	0.655
0	1	0	1	0	0	1	1	5		3	0.660
0	1	0	1	0	1	0	0	5		4	0.665
0	1	0	1	0	1	0	1	5		5	0.670
0	1	0	1	0	1	1	0	5		6	0.675
0	1	0	1	0	1	1	1	5		7	0.680
0	1	0	1	1	0	0	0	5		8	0.685
0	1	0	1	1	0	0	1	5		9	0.690
0	1	0	1	1	0	1	0	5		A	0.695
0	1	0	1	1	0	1	1	5		B	0.700
0	1	0	1	1	1	0	0	5		C	0.705
0	1	0	1	1	1	0	1	5		D	0.710
0	1	0	1	1	1	1	0	5		E	0.715
0	1	0	1	1	1	1	1	5		F	0.720
0	1	1	0	0	0	0	0	6		0	0.725
0	1	1	0	0	0	0	1	6		1	0.730
0	1	1	0	0	0	1	0	6		2	0.735
0	1	1	0	0	0	1	1	6		3	0.740
0	1	1	0	0	1	0	0	6		4	0.745
0	1	1	0	0	1	0	1	6		5	0.750
0	1	1	0	0	1	1	0	6		6	0.755
0	1	1	0	0	1	1	1	6		7	0.760
0	1	1	0	1	0	0	0	6		8	0.765
			0		0	0		6			0.770
0	1	1		1			1			9
											To be continued
www.richtek.com									DS8168B-00		November 2011

6

											RT8168B
VID7		VID6	VID5	VID4	VID3	VID2	VID1	VID0	H1	H0		DAC Voltage
0		1	1	0	1	0	1	0	6	A		0.775
0		1	1	0	1	0	1	1	6	B		0.780
0		1	1	0	1	1	0	0	6	C		0.785
0		1	1	0	1	1	0	1	6	D		0.790
0		1	1	0	1	1	1	0	6	E		0.795
0		1	1	0	1	1	1	1	6	F		0.800
0		1	1	1	0	0	0	0	7	0		0.805
0		1	1	1	0	0	0	1	7	1		0.810
0		1	1	1	0	0	1	0	7	2		0.815
0		1	1	1	0	0	1	1	7	3		0.820
		1	1	1	0	1	0	0	7	4		0.825
0
0		1	1	1	0	1	0	1	7	5		0.830
0		1	1	1	0	1	1	0	7	6		0.835
0		1	1	1	0	1	1	1	7	7		0.840
0		1	1	1	1	0	0	0	7	8		0.845
0		1	1	1	1	0	0	1	7	9		0.850
0		1	1	1	1	0	1	0	7	A		0.855
0		1	1	1	1	0	1	1	7	B		0.860
		1	1	1	1	1	0	0	7	C		0.865
0
0		1	1	1	1	1	0	1	7	D		0.870
0		1	1	1	1	1	1	0	7	E		0.875
		1	1	1	1	1	1	1	7	F		0.880
0
1		0	0	0	0	0	0	0	8	0		0.885
1		0	0	0	0	0	0	1	8	1		0.890
1		0	0	0	0	0	1	0	8	2		0.895
1		0	0	0	0	0	1	1	8	3		0.900
1		0	0	0	0	1	0	0	8	4		0.905
1		0	0	0	0	1	0	1	8	5		0.910
1		0	0	0	0	1	1	0	8	6		0.915
1		0	0	0	0	1	1	1	8	7		0.920
1		0	0	0	1	0	0	0	8	8		0.925
1		0	0	0	1	0	0	1	8	9		0.930
1		0	0	0	1	0	1	0	8	A		0.935
1		0	0	0	1	0	1	1	8	B		0.940
1		0	0	0	1	1	0	0	8	C		0.945
		0								D		0.950
1			0	0	1	1	0	1	8
												To be continued
DS8168B-00		November 2011										www.richtek.com
											7

RT8168B

VID7	VID6	VID5	VID4	VID3	VID2	VID1	VID0	H1		H0	DAC Voltage
1	0	0	0	1	1	1	0	8		E	0.955
1	0	0	0	1	1	1	1	8		F	0.960
1	0	0	1	0	0	0	0	9		0	0.965
1	0	0	1	0	0	0	1	9		1	0.970
1	0	0	1	0	0	1	0	9		2	0.975
1	0	0	1	0	0	1	1	9		3	0.980
1	0	0	1	0	1	0	0	9		4	0.985
1	0	0	1	0	1	0	1	9		5	0.990
1	0	0	1	0	1	1	0	9		6	0.995
1	0	0	1	0	1	1	1	9		7	1.000
1	0	0	1	1	0	0	0	9		8	1.005
1	0	0	1	1	0	0	1	9		9	1.010
1	0	0	1	1	0	1	0	9		A	1.015
1	0	0	1	1	0	1	1	9		B	1.020
1	0	0	1	1	1	0	0	9		C	1.025
1	0	0	1	1	1	0	1	9		D	1.030
1	0	0	1	1	1	1	0	9		E	1.035
1	0	0	1	1	1	1	1	9		F	1.040
1	0	1	0	0	0	0	0	A		0	1.045
1	0	1	0	0	0	0	1	A		1	1.050
1	0	1	0	0	0	1	0	A		2	1.055
1	0	1	0	0	0	1	1	A		3	1.060
1	0	1	0	0	1	0	0	A		4	1.065
1	0	1	0	0	1	0	1	A		5	1.070
1	0	1	0	0	1	1	0	A		6	1.075
1	0	1	0	0	1	1	1	A		7	1.080
1	0	1	0	1	0	0	0	A		8	1.085
1	0	1	0	1	0	0	1	A		9	1.090
1	0	1	0	1	0	1	0	A		A	1.095
1	0	1	0	1	0	1	1	A		B	1.100
1	0	1	0	1	1	0	0	A		C	1.105
1	0	1	0	1	1	0	1	A		D	1.110
1	0	1	0	1	1	1	0	A		E	1.115
1	0	1	0	1	1	1	1	A		F	1.120
1	0	1	1	0	0	0	0	B		0	1.125
1	0	1	1	0	0	0	1	B		1	1.130
											To be continued
www.richtek.com									DS8168B-00		November 2011

8

											RT8168B
VID7		VID6	VID5	VID4	VID3	VID2	VID1	VID0	H1	H0		DAC Voltage
1		0	1	1	0	0	1	0	B	2		1.135
1		0	1	1	0	0	1	1	B	3		1.140
1		0	1	1	0	1	0	0	B	4		1.145
1		0	1	1	0	1	0	1	B	5		1.150
1		0	1	1	0	1	1	0	B	6		1.155
1		0	1	1	0	1	1	1	B	7		1.160
1		0	1	1	1	0	0	0	B	8		1.165
1		0	1	1	1	0	0	1	B	9		1.170
1		0	1	1	1	0	1	0	B	A		1.175
1		0	1	1	1	0	1	1	B	B		1.180
1		0	1	1	1	1	0	0	B	C		1.185
1		0	1	1	1	1	0	1	B	D		1.190
1		0	1	1	1	1	1	0	B	E		1.195
1		0	1	1	1	1	1	1	B	F		1.200
1		1	0	0	0	0	0	0	C	0		1.205
1		1	0	0	0	0	0	1	C	1		1.210
1		1	0	0	0	0	1	0	C	2		1.215
1		1	0	0	0	0	1	1	C	3		1.220
1		1	0	0	0	1	0	0	C	4		1.225
1		1	0	0	0	1	0	1	C	5		1.230
1		1	0	0	0	1	1	0	C	6		1.235
1		1	0	0	0	1	1	1	C	7		1.240
1		1	0	0	1	0	0	0	C	8		1.245
1		1	0	0	1	0	0	1	C	9		1.250
1		1	0	0	1	0	1	0	C	A		1.255
1		1	0	0	1	0	1	1	C	B		1.260
1		1	0	0	1	1	0	0	C	C		1.265
1		1	0	0	1	1	0	1	C	D		1.270
1		1	0	0	1	1	1	0	C	E		1.275
1		1	0	0	1	1	1	1	C	F		1.280
1		1	0	1	0	0	0	0	D	0		1.285
1		1	0	1	0	0	0	1	D	1		1.290
1		1	0	1	0	0	1	0	D	2		1.295
1		1	0	1	0	0	1	1	D	3		1.300
1		1	0	1	0	1	0	0	D	4		1.305
		1				1			D	5		1.310
1			0	1	0		0	1
												To be continued
DS8168B-00		November 2011										www.richtek.com
											9

RT8168B

VID7	VID6	VID5	VID4	VID3	VID2	VID1	VID0	H1		H0	DAC Voltage
1	1	0	1	0	1	1	0	D		6	1.315
1	1	0	1	0	1	1	1	D		7	1.320
1	1	0	1	1	0	0	0	D		8	1.325
1	1	0	1	1	0	0	1	D		9	1.330
1	1	0	1	1	0	1	0	D		A	1.335
1	1	0	1	1	0	1	1	D		B	1.340
1	1	0	1	1	1	0	0	D		C	1.345
1	1	0	1	1	1	0	1	D		D	1.350
1	1	0	1	1	1	1	0	D		E	1.355
1	1	0	1	1	1	1	1	D		F	1.360
	1	1	0	0	0	0	0	E		0	1.365
1
1	1	1	0	0	0	0	1	E		1	1.370
1	1	1	0	0	0	1	0	E		2	1.375
1	1	1	0	0	0	1	1	E		3	1.380
1	1	1	0	0	1	0	0	E		4	1.385
1	1	1	0	0	1	0	1	E		5	1.390
1	1	1	0	0	1	1	0	E		6	1.395
1	1	1	0	0	1	1	1	E		7	1.400
	1	1	0	1	0	0	0	E		8	1.405
1
1	1	1	0	1	0	0	1	E		9	1.410
1	1	1	0	1	0	1	0	E		A	1.415
1	1	1	0	1	0	1	1	E		B	1.420
1	1	1	0	1	1	0	0	E		C	1.425
1	1	1	0	1	1	0	1	E		D	1.430
	1	1	0	1	1	1	0	E		E	1.435
1
1	1	1	0	1	1	1	1	E		F	1.440
	1	1	1	0	0	0	0	F		0	1.445
1
1	1	1	1	0	0	0	1	F		1	1.450
	1	1	1	0	0	1	0	F		2	1.455
1
1	1	1	1	0	0	1	1	F		3	1.460
	1	1	1	0	1	0	0	F		4	1.465
1
1	1	1	1	0	1	0	1	F		5	1.470
1	1	1	1	0	1	1	0	F		6	1.475
1	1	1	1	0	1	1	1	F		7	1.480
1	1	1	1	1	0	0	0	F		8	1.485
											To be continued
www.richtek.com									DS8168B-00		November 2011

10

										RT8168B
VID7	VID6	VID5	VID4	VID3	VID2	VID1	VID0	H1	H0		DAC Voltage
1	1	1	1	1	0	0	1	F	9		1.490
1	1	1	1	1	0	1	0	F	A		1.495
1	1	1	1	1	0	1	1	F	B		1.500
1	1	1	1	1	1	0	0	F	C		1.505
1	1	1	1	1	1	0	1	F	D		1.510
1	1	1	1	1	1	1	0	F	E		1.515
1	1	1	1	1	1	1	1	F	F		1.520

DS8168B-00 November 2011	www.richtek.com
	11

RT8168B

Functional Pin Description

	Pin No.			Pin Name			Pin Function
	1	BOOT1					CPU VR Bootstrap Power Pin. This pin powers the high side MOSFET drivers.
							Connect this pin to the PHASE1 pin with a bootstrap capacitor.
	2	TONSET					Single-Phase CPU VR On-Time Setting Pin. Connect this pin to VIN with a
							resistor to set ripple size in PWM mode.
	3	ISEN1P					Positive Current Sense Input Pin of CPU VR.
	4	ISEN1N					Negative Current Sense Input Pin of CPU VR.
	5	COMP					CPU VR Compensation Pin. This pin is the output of the error amplifier.
	6	FB					CPU VR Feedback Pin. This pin is the inverting input node of the error amplifier.
	7	RGND					Return Ground for CPU VR. This pin is the inverting input node for differential
							remote voltage sensing.
	8	GFXPS2					Set Pin for GPU VR Operation Mode. Logic-high on this pin will force the GPU VR
							to enter DCM.
	9	VCC					Controller Power Supply Pin. Connect this pin to GND via a ceramic capacitor
							larger than 1μF.
	10	SETINIA					ADC Input for Single-Phase GPU VR VBOOT Voltage Setting.
	11	SETINI					ADC Input for Single-Phase CPU VR VBOOT Voltage Setting.
	12	TMPMAX					ADC Input for Single-Phase CPU VR Maximum Temperature Setting.
	13	ICCMAX					ADC Input for Single-Phase CPU VR Maximum Current Setting.
	14	ICCMAXA					ADC Input for Single-Phase GPU VR Maximum Current Setting.
	15	TSEN					Thermal Monitor Sense Input Pin for CPU VR.
							Set Pin for Single-Phase CPU VR Over Current Protection Threshold.
	16	OCSET					Connect a resistive voltage divider from VCC to ground, and connect the joint of
							the voltage divider to the OCSET pin. The voltage, VOCSET, at this pin sets the
							over current threshold, ILIMIT, for CPU VR.
	17	TSENA					Thermal Monitor Sense Input for GPU VR.
							Set Pin for Single-Phase GPU VR Over Current Protection Threshold.
	18	OCSETA					Connect a resistive voltage divider from VCC to ground, and connect the joint of
							the voltage divider to the OCSETA pin. The voltage, VOCSETA, at this pin sets the
							over current threshold, ILIMIT, for GPU VR.
	19	IBIAS					Internal Bias Current Setting. Connect a 53.6kΩ resistor from this pin to GND to
							set the internal bias current.
	20						Thermal Monitor Output Pin (active low).
			VRHOT
	21	VR_READY					CPU VR Voltage Ready Indicator. This pin has an open drain output.
	22	VRA_READY					GPU VR Voltage Ready Indicator. This pin has an open drain output.
	23						Alert Line of SVID Interface (active low). This pin has an open drain output.
				ALERT
	24	VDIO					Data Transmission Line of SVID Interface.
	25	VCLK					Clock Signal Line of SVID Interface.
	26	RGNDA					Return Ground for Single-Phase GPU VR.
							This pin is the inverting input node for differential remote voltage sensing.
	27	FBA					GPU VR Feedback Pin. This pin is the inverting input node of the error amplifier.
	28	COMPA					Single-Phase GPU VR Compensation Pin. This pin is the output of the error
							amplifier.
	29	ISENAN					Negative Current Sense Input Pin of Single-Phase GPU VR.
	30	ISENAP					Positive Current Sense Input Pin of Single-Phase GPU VR.
	31	TONSETA					Single-Phase GPU VR On-Time Setting Pin. Connect this pin to VIN with a
							resistor to set ripple size in PWM mode.

	To be continued
www.richtek.com	DS8168B-00 November 2011

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