PWM Controller. RT8868 Datasheet

RT8868 Controller. Datasheet pdf. Equivalent


Richtek RT8868
®
RT8868
4/3/2/1-Phase PWM Controller for AMD AM2/AM2+/AM3 CPUs
General Description
The RT8868 is a 4/3/2/1-phase synchronous buck
controller with two integrated MOSFET drivers for CPU
power application and a single-phase buck with integrated
MOSFET driver for North-Bridge (NB) chipset.The RT8868
uses differential inductor DCR current sense to achieve
phase current balance and active voltage positioning. Other
features include adjustable operating frequency, power
good indication, external error-amp compensation, over
voltage protection, over current protection and enable/
shutdown for various applications. The RT8868 comes in
a small footprint with WQFN-48L 7x7 package.
Applications
z Desktop CPU Core Power
z Low Voltage, High Current DC/DC Converter
Ordering Information
RT8868
Package Type
QW : WQFN-48L 7x7 (W-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
RT8868GQW
RT8868GQW : Product Code
RT8868
GQW
YMDNN
YMDNN : Date Code
RT8868ZQW
RT8868
ZQW
YMDNN
RT8868ZQW : Product Code
YMDNN : Date Code
Features
z 12V Power Supply Voltage
z 4/3/2/-Phase Power Conversion for VCORE Power
z 3 Embedded MOSFET Drivers (2 for CPU and 1 for
NB)
z Internal Regulated 5V Output
z Support AMD AM2 6-bit Parallel and AM2+ 7-bit
Serial VID Tables
z Support 3.4MHz High Speed I2C
z Continuous Differential Inductor DCR Current Sense
z Adjustable Frequency (Typically at 300kHz)
z Selectable 1 or 2 Phase in Power-Saving (PS) Mode
z Phase-Interleaving for VCORE Controller
z Power Good Indication
z Adjustable Over Current Protection
z Over Voltage Protection
z Small 48-Lead WQFN Package
z RoHS Compliant and Halogen Free
Pin Configurations
(TOP VIEW)
48 47 46 45 44 43 42 41 40 39 38 37
PWROK 1
36 BOOT_NB
RT 2
35 BOOT1
FBRTN 3
34 UGATE1
FBRTN_NB 4
33 PHASE1
FB_NB 5
32 LGATE1
COMP_NB 6
ISP_NB 7
GND
31 VCC12
30 LGATE2
ISN_NB 8
29 PHASE2
ADJ 9
28 UGATE2
OFS 10
COMP 11
49 27 BOOT2
26 PWM3
FB 12
25 PWM4
13 14 15 16 17 18 19 20 21 22 23 24
WQFN-48L 7x7
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8868-05 January 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


RT8868 Datasheet
Recommendation RT8868 Datasheet
Part RT8868
Description 4/3/2/1-Phase PWM Controller
Feature RT8868; ® RT8868 4/3/2/1-Phase PWM Controller for AMD AM2/AM2+/AM3 CPUs General Description The RT8868 is .
Manufacture Richtek
Datasheet
Download RT8868 Datasheet




Richtek RT8868
RT8868
Typical Application Circuit
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8868-05 January 2014



Richtek RT8868
RT8868
SVID[6:0]
0000000
0000001
0000010
0000011
0000100
0000101
0000110
0000111
0001000
0001001
0001010
0001011
0001100
0001101
0001110
0001111
0010000
0010001
0010010
0010011
0010100
0010101
0010110
0010111
0011000
0011001
0011010
0011011
0011100
0011101
0011110
0011111
Table 1. 7-bit VID Code Table for AM2+/AM3 CPU (Serial)
Voltage SVID[6:0] Voltage SVID[6:0] Voltage SVID[6:0]
1.5500
0100000
1.1500
1000000
0.7500
1100000
1.5375
0100001
1.1375
1000001
0.7375
1100001
1.5250
0100010
1.1250
1000010
0.7250
1100010
1.5125
0100011
1.1125
1000011
0.7125
1100011
1.5000
0100100
1.1000
1000100
0.7000
1100100
1.4875
0100101
1.0875
1000101
0.6875
1100101
1.4750
0100110
1.0750
1000110
0.6750
1100110
1.4625
0100111
1.0625
1000111
0.6625
1100111
1.4500
0101000
1.0500
1001000
0.6500
1101000
1.4375
0101001
1.0375
1001001
0.6375
1101001
1.4250
0101010
1.0250
1001010
0.6250
1101010
1.4125
0101011
1.0125
1001011
0.6125
1101011
1.4000
0101100
1.0000
1001100
0.6000
1101100
1.3875
0101101
0.9875
1001101
0.5875
1101101
1.3750
0101110
0.9750
1001110
0.5750
1101110
1.3625
0101111
0.9625
1001111
0.5625
1101111
1.3500
0110000
0.9500
1010000
0.5500
1110000
1.3375
0110001
0.9375
1010001
0.5375
1110001
1.3250
0110010
0.9250
1010010
0.5250
1110010
1.3125
0110011
0.9125
1010011
0.5125
1110011
1.3000
0110100
0.9000
1010100
0.5000
1110100
1.2875
0110101
0.8875
1010101
0.4875
1110101
1.2750
0110110
0.8750
1010110
0.4750
1110110
1.2625
0110111
0.8625
1010111
0.4625
1110111
1.2500
0111000
0.8500
1011000
0.4500
1111000
1.2375
0111001
0.8375
1011001
0.4375
1111001
1.2250
0111010
0.8250
1011010
0.4250
1111010
1.2125
0111011
0.8125
1011011
0.4125
1111011
1.2000
0111100
0.8000
1011100
0.4000
1111100
1.1875
0111101
0.7875
1011101
0.3875
1111101
1.1750
0111110
0.7750
1011110
0.3750
1111110
1.1625
0111111
0.7625
1011111
0.3625
1111111
Voltage
0.3500
0.3375
0.3250
0.3125
0.3000
0.2875
0.2750
0.2625
0.2500
0.2375
0.2250
0.2125
0.2000
0.1875
0.1750
0.1625
0.1500
0.1375
0.1250
0.1125
0.1000
0.0875
0.0750
0.0675
0.0500
0.0375
0.0250
0.0125
OFF
OFF
OFF
OFF
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8868-05 January 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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