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RT9248GC

更新时间： 2024-11-12 04:32:55
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立锜 - RICHTEK 多相元件控制器
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14页 326K
描述
Multi-Phase PWM Controller for CPU Core Power Supply

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Preliminary  
RT9248  
Multi-Phase PWM Controller for CPU Core Power Supply  
General Description  
Features  
z Multi-Phase Power Conversion with Automatic  
The RT9248 is a multi-phase buck DC/DC controller  
integrated with all control functions for GHz CPU VRM.  
The RT9248 controls 2 or 3 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 VRM9 & VRD10 DAC Output with Active Droop  
Compensation for Fast Load Transient  
z Smooth VCORE Transition at VID Jump  
z Multi-Level VID125 Input for VRM9 & VRD10  
Selection  
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  
RT9248 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: VRM9 and VRD10  
z Low Output Voltage, High CurrentDC-DC Converters  
z Voltage Regulator Modules  
The DAC output of RT9248 supports VRM9 & VRD10 by  
VID125 multi-level input, precise initial value & smooth  
VCORE transient at VID jump. The IC monitors the VCORE  
voltage for PGOODand over-voltage protection. Soft-start,  
over-current protection and programmable under-voltage  
lockout are also provided to assure the safety of micro-  
processor and power system.  
Pin Configurations  
(TOP VIEW)  
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
VID4  
VID3  
VCC  
2
PWM1  
PWM2  
PWM3  
ISN1  
ISP1  
ISP2  
VID2  
3
VID1  
4
VID0  
5
VID125  
SGND  
FB  
6
7
8
Ordering Information  
RT9248  
ISP3  
ISN23  
GND  
ADJ  
VDIF  
VSEN  
IMAX  
COMP  
PGOOD  
DVD  
SS  
RT  
VOSS  
9
Package Type  
C : TSSOP-28  
10  
11  
12  
13  
14  
Operating Temperature Range  
P : Pb Free with Commercial Standard  
G : Green (Halogen Free with Commer-  
cial Standard)  
Note :  
TSSOP-28  
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.  
DS9248-05 March 2007  
www.richtek.com  
1
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