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PDF RT8868A Data sheet ( Hoja de datos )
| Número de pieza | RT8868A | |
| Descripción | 4/3/2/1-Phase PWM Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT8868A
4/3/2/1-Phase PWM Controller for AMD AM2/AM2+/AM3 CPUs
General Description
The RT8868A 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
RT8868A 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 RT8868A 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
RT8868A
Package Type
QW : WQFN-48L 7x7 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
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
RT8868AGQW : Product Number
RT8868A
GQW
YMDNN : Date Code
YMDNN
Features
z 12V Power Supply Voltage
z 4/3/2/1-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
RT 2
FBRTN 3
FBRTN_NB 4
FB_NB 5
COMP_NB 6
ISP_NB 7
ISN_NB 8
ADJ 9
OFS 10
COMP 11
FB 12
GND
36 BOOT_NB
35 BOOT1
34 UGATE1
33 PHASE1
32 LGATE1
31 VCC12
30 LGATE2
29 PHASE2
28 UGATE2
49 27 BOOT2
26 PWM3
25 PWM4
13 14 15 16 17 18 19 20 21 22 23 24
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8868A-01 January 2014
WQFN-48L 7x7
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8868A
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 PWROK
PWROK Input Signal.
2 RT
Connect this Pin to GND by a Resistor to Adjust Frequency.
3 FBRTN
Remote Sense Ground for CORE.
4 FBRTN_NB
Remote Sense Ground for NB.
5 FB_NB
Inverting Input of Error-Amp for NB.
6 COMP_NB
Output of Error-Amp and Input of PWM Comparator for NB.
7 ISP_NB
Positive Current Sense Pin of NB.
8 ISN_NB
9 ADJ
10 OFS
11 COMP
12 FB
13 IMAX_NB
14 IMAX
15, 17, 19, 21 ISN1, ISN2, ISN3, ISN4
16, 18, 20, 22 ISP1, ISP2, ISP3, ISP4
Negative Current Sense Pin of NB.
Connect this Pin to GND by a Resistor to set Load Line of
VCORE.
Connect this Pin to 5VCC by a Resistor to set No-Load Offset
Voltage of VCORE.
Output of Error-Amp and Input of PWM Comparator of VCORE.
Inverting Input of Error-Amp of VCORE.
Connect this Pin to GND by a Resistor to set OCP of NB.
Connect this Pin to GND by a Resistor to set OCP of VCORE.
Negative Current Sense Pin of Channel 1, 2, 3 and 4.
Positive Current Sense Pin of Channel 1, 2, 3 and 4.
23
24
25,26
PS
VCC5
PWM4, PWM3
Power Saving Mode Selection Pin.
Output of Internal 5V Regulator for Control Circuits Power
Supply. Connect this Pin to GND by a Ceramic Capacitor Larger
than 1μF.
PWM Output for Channel 4 and Channel 3.
27, 35, 36 BOOT2, BOOT1, BOOT_NB
Bootstrap Supply for Channel 2 and Channel 1 and NB.
28, 34, 37 UGATE2, UGATE1, UGATE_NB Upper Gate Driver for Channel 2 and Channel 1 and NB.
29, 33, 38 PHASE2, PHASE1, PHASE_NB Switching Node of Channel 2 and Channel 1 and NB.
30, 32, 39 LGATE2, LGATE1, LGATE_NB Lower Gate Driver for Channel 2 and Channel 1 and NB.
31, 40
41
42
43
44
45, 46
VCC12, VCC12_NB
VID0/VFIXEN
VID1/PVI
VID2/SVD
VID3/SVC
VID4, VID5
IC Power Supply. Connect this pin to 12V.
PVI Mode : Used as Voltage Identification Input for DAC.
SVI Mode : Functions as VFIXEN Selection Input.
This Pin Selects PVI/SVI Mode Based on the State of this Pin
Prior to EN Signal.
PVI Mode : Used as Voltage Identification Input for DAC.
PVI Mode : Used as Voltage Identification Input for DAC.
SVI Mode : Serial Data Input.
PVI Mode : Used as Voltage Identification Input for DAC.
SVI Mode : Serial Clock Input.
PVI Mode : Used as Voltage Identification Input for DAC.
47 PGOOD
Power Good Indicator (open drain).
48 EN
49
(Exposed pad)
GND
Enable Input Signal.
Reference Ground for the IC. The exposed pad must be
soldered to a large PCB and connected to GND for maximum
power dissipation.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8868A-01 January 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT8868A
VCCP_NB
(1V/Div)
VCCP_CORE
(1V/Div)
SVC
(2V/Div)
SVD
(2V/Div)
Dynamic VID Up
Time (40μs/Div)
VCCP_NB
(1V/Div)
VCCP_CORE
(1V/Div)
SVC
(2V/Div)
SVD
(2V/Div)
Dynamic VID Down
Time (40μs/Div)
Over Voltage Protection_CORE
VID = 0.8V, Increase COMP
Voltage to Trigger OVP
FB
(1V/Div)
LGATE1
(10V/Div)
UGATE1
(20V/Div)
Time (40μs/Div)
FB_NB
(1V/Div)
LGATE_NB
(10V/Div)
UGATE_NB
(20V/Div)
Over Voltage Protection_NB
VID = 0.8V, Increase COMP_NB
Voltage to Trigger OVP
Time (40μs/Div)
Over Current Protection_CORE
VCCP_CORE
(1V/Div)
PGOOD
(1V/Div)
UGATE1
(20V/Div)
ILOAD
(50A/Div)
Time (100μs/Div)
Over Current Protection_NB
VCCP_NB
(1V/Div)
PGOOD
(1V/Div)
UGATE_NB
(20V/Div)
ILOAD
(20A/Div)
Time (100μs/Div)
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8868A-01 January 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet RT8868A.PDF ] | |
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