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RT8207L PDF预览

RT8207L

更新时间： 2024-11-12 12:58:19
品牌 Logo 应用领域
立锜 - RICHTEK 双倍数据速率控制器
页数 文件大小 规格书
22页 363K
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RT8207L 技术参数

Status：ActiveVs (typ) (V)：12
Vin (min) (V)：4.5Vin (max) (V)：26
Vout (min) (V)：0.75Vout (max) (V)：3.3
Preset Vout (V)：Output Adj. Method：Resistor
Accuracy (+/- %)：1Freq (typ) (kHz)：300
Freq (min) (kHz)：200Freq (max) (kHz)：600
Iq (typ) (mA)：0.47Features：Adjustable Current Limit;Adjustable Frequency;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;OVP;PSM;Power Good;SCP;UVP
Package Type：WQFN3x3-20;WQFN4x4-24

RT8207L 数据手册

 浏览型号RT8207L的Datasheet PDF文件第2页浏览型号RT8207L的Datasheet PDF文件第3页浏览型号RT8207L的Datasheet PDF文件第4页浏览型号RT8207L的Datasheet PDF文件第5页浏览型号RT8207L的Datasheet PDF文件第6页浏览型号RT8207L的Datasheet PDF文件第7页 
RT8207  
Complete DDRII/DDRIII Memory Power Supply Controller  
General Description  
Features  
z PWM Controller  
The RT8207 provides a complete power supply for both  
DDRII/DDRIII memory systems. It integrates a  
synchronous PWM buck controller with a 3A sink/source  
tracking linear regulator and a buffered low noise reference.  
` Resistor Programmable Current Limit by Low-Side  
RDS(ON) Sense  
` Quick Load-Step Response within 100ns  
` 1% VOUT Accuracy Over Line and Load  
` Fixed 1.8V (DDRII), 1.5V (DDRIII) or Adjustable  
0.75V to 3.3V Output Range  
The PWM controller provides the high efficiency, excellent  
transient response, and highDC output accuracy needed  
for stepping down high-voltage batteries to generate low  
voltage chipset RAM supplies in notebook computers.  
The constant-on-time PWM control scheme handles wide  
input/output voltage ratios with ease and provides 100ns  
“instant-on” response to load transients while maintaining  
a relatively constant switching frequency.  
` Battery Input Range 2.5V to 26V  
` Resistor Programmable Frequency  
` Over/Under Voltage Protection  
` 4 Steps Current Limit During Soft-Start  
` Drives Large Synchronous-Rectifier FETs  
` Power-Good Indicator  
The RT8207 achieves high efficiency at a reduced cost  
by eliminating the current-sense resistor found in  
traditional current-mode PWMs. Efficiency is further  
enhanced by its ability to drive very large synchronous  
rectifier MOSFETs. The buck conversion allows this device  
to directly step down high-voltage batteries for the highest  
possible efficiency.  
z 3A LDO (VTT), Buffered Reference (VTTREF)  
` Capable to Sink and Source Up to 3A  
` LDO Input Available to Optimize Power Losses  
` Requires Only 20μF Ceramic Output Capacitor  
` Buffered Low Noise 10mA VTTREF Output  
` Accuracy 20mV for Both VTTREF and VTT  
` Supports High-Z in S3 and Soft-Off in S4/S5  
z RoHS Compliant and Halogen Free  
The 3Asink/source LDO maintains fast transient response  
only requiring 20μF of ceramic output capacitance. In  
addition, the LDO supply input is available externally to  
significantly reduce the total power losses. The RT8207  
supports all of the sleep state controls placing VTT at  
High-Z in S3 and discharging VDDQ, VTT and VTTREF  
(soft-off) in S4/S5.  
Applications  
z DDRII/DDRIII Memory Power Supplies  
z Notebook Computers  
z SSTL18, SSTL15 and HSTL Bus Termination  
The RT8207 has all of the protection features including  
thermal shutdown and is available in the WQFN-24L 4x4  
package.  
Pin Configurations  
(TOP VIEW)  
Ordering Information  
RT8207  
24 23 22 21 20 19  
1
2
3
18  
17  
16  
VTTGND  
VTTSNS  
GND  
PGND  
NC  
CS  
Package Type  
QW : WQFN-24L 4x4 (W-Type)  
GND  
4
5
6
15  
14  
13  
MODE  
VTTREF  
DEM  
VDDP  
VDD  
PGOOD  
25  
Lead Plating System  
7
8
9 10 11 12  
G : Green (Halogen Free and Pb Free)  
Note :  
Richtek products are :  
WQFN-24L 4x4  
` 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.  
DS8207-07 March 2011  
www.richtek.com  
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