Datasheet 搜索 > 稳压芯片 > Richtek（立锜） > RT8207GQW 数据手册 > RT8207GQW 其他数据使用手册 1/22 页
￥ 1.296
RT8207GQW 其他数据使用手册 - Richtek（立锜）
制造商:
Richtek（立锜）
分类:
稳压芯片
封装:
WQFN-24
描述:
RICHTEK RT8207GQW 芯片, 直流/直流转换器, 降压, WQFN-24
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
导航目录
RT8207GQW数据手册
Page:
of 22 Go
若手册格式错乱，请下载阅览PDF原文件
RT8207
1
DS8207-05 December 2009 www.richtek.com
Ordering Information
Note :
Richtek 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.
Complete DDRII/DDRIII Memory Power Supply Controller
General Description
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.
The PWM controller provides the high efficiency, excellent
transient response, and high DC 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.
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.
The 3A sink/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.
The RT8207 has all of the protection features including
thermal shutdown and is available in the WQFN-24L 4x4
package.
Features
zz
zz
z PWM Controller
``
``
` Resistor Programmable Current Limit by Low-Side
R
DS(ON)
Sense
``
``
` Quick Load-Step Response within 100ns
``
``
` 1% V
OUT
Accuracy Over Line and Load
``
``
` Fixed 1.8V (DDRII), 1.5V (DDRIII) or Adjustable
0.75V to 3.3V Output Range
``
``
` 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
zz
zz
z 3A LDO (VTT), Buffered Reference (VTTREF)
``
``
` Capable to Sink and Source Up to 3A
``
``
` LDO Input Available to Optimize Power Losses
``
``
` Requires Only 20
μμ
μμ
μF 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
zz
zz
z RoHS Compliant and Halogen Free
Applications
z DDRII/DDRIII Memory Power Supplies
z Notebook Computers
z SSTL18, SSTL15 and HSTL Bus Termination
RT8207
Package Type
QW : WQFN-24L 4x4 (W-Type)
Operating Temperature Range
G : Green (Halogen Free with Commer-
cial Standard)
Pin Configurations
(TOP VIEW)
WQFN-24L 4x4
VTTGND
VTTSNS
GND
MODE
VTTREF
DEM
TON
NC
VDDQ
FB
S5
S3
PGND
NC
VDDP
VDD
PGOOD
CS
UGATE
LGATE
VTT
VLDOIN
BOOT
PHASE
GND
1
2
3
4
5
6
78910 1211
18
17
16
15
14
13
21 20 1924 2223
25
器件 Datasheet 文档搜索
AiEMA 数据库涵盖高达 72,405,303 个元件的数据手册，每天更新 5,000 多个 PDF 文件
