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RT9243

更新时间： 2024-09-24 04:32:55
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立锜 - RICHTEK 多相元件控制器
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18页 488K
描述
Multi-Phase PWM Controller for CPU Core Power Supply

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RT9243 数据手册

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RT9243  
Multi-Phase PWM Controller for CPU Core Power Supply  
General Description  
Features  
z Multi-Phase Power Conversion with Automatic  
The RT9243 is a multi-phase buck DC/DC controller  
integrated with all control functions for GHz CPU VRM.  
The RT9243 controls 2, 3 or 4 buck switching stages  
operating in interleaved phase set automatically. The multi-  
phase architecture provides high output current while  
maintaining low power dissipation on power devices and  
low stress on input and output capacitors. The high  
equivalent operating frequency also reduces the  
component dimension and the output voltage ripple in load  
transient.  
Phase Selection  
z VRD10.x DAC Output with Active Droop Compens-  
ation for Fast Load Transient  
z Smooth VCORE Transition at VID Jump  
z Power Stage Thermal Balance by RDS(ON) Current  
Sense  
z Hiccup Mode Over-Current Protection  
z Programmable Switching Frequency (50kHz to  
400kHz per Phase), Under-Voltage Lockout and  
Soft-Start  
RT9243 controls both voltage and current loops to achieve  
good regulation, response & power stage thermal balance.  
Precise current loop using RDS(ON) as sense component  
builds precise load line for strict VRM DC & transient  
specification and also ensures thermal balance of different  
power stages. The settings of current sense, droop tuning,  
VCORE initial offset and over current protection are  
independent to compensation circuit of voltage loop. The  
feature greatly facilitates the flexibility of CPU power supply  
design and tuning.  
z High Ripple Frequency Times Channel Number  
z RoHS Compliant and 100% Lead (Pb)-Free  
Applications  
z Intel® Processors Voltage Regulator: VRD10.x  
z Low Output Voltage, High CurrentDC-DC Converters  
z Voltage Regulator Modules  
Pin Configurations  
The DAC output of RT9243 supports VRD10.x by 6-bit  
VID input, precise initial value & smooth VCORE transient  
at VIID jump. The IC monitors the VCORE voltage for PGOOD  
and over-voltage protection. Soft-start, over-current  
protection and programmable under-voltage lockout are  
also provided to assure the safety of microprocessor and  
power system.  
(TOP VIEW)  
OVP  
PGOOD  
VID4  
VID3  
VID2  
VID1  
VID0  
VID125  
VOSS  
ADJ  
SS  
FB  
COMP  
VDIF  
ISN4  
ISN3  
RT  
DVD  
VCC  
PWM4  
ISP4  
32  
31  
30  
29  
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
ISP2  
PWM2  
PWM1  
ISP1  
Ordering Information  
RT9243  
ISP3  
PWM3  
GND  
SGND  
VSEN  
ISN1  
ISN2  
Package Type  
S : SOP-32  
Operating Temperature Range  
P : Pb Free with Commercial Standard  
G : Green (Halogen Free with Commer-  
cial Standard)  
Note :  
SOP-32  
RichTek Pb-free and Green 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.  
`100%matte tin (Sn) plating.  
DS9243-07 March 2007  
www.richtek.com  
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