RT9173A Datasheet PDF - Richtek Technology Corporation

www.Datasheet-PDF.com

RT9173A
Richtek Technology Corporation

Part Number RT9173A
Description 1.5A/3A Bus Termination Regulator
Page 14 Pages


RT9173A datasheet pdf
View PDF for PC
RT9173A pdf
View PDF for Mobile


No Preview Available !

® RT9173/A
Peak 3A Bus Termination Regulator
General Description
Features
The RT9173/A regulator is designed to convert voltage
supplies ranging from 1.6V to 6V into a desired output
voltage which adjusted by two external voltage divider
resistors. The regulator is capable of sourcing or sinking
up to 3A of peak current while regulating an output voltage
to within 2% (DDR 1) and 3% (DDR 2) or less.
The RT9173/A, used in conjunction with series termination
resistors, provides an excellent voltage source for active
termination schemes of high speed transmission lines as
those seen in high speed memory buses and distributed
backplane designs. The voltage output of the regulator
can be used as a termination voltage for DDR SDRAM.
Current limits in both sourcing and sinking mode, plus
on-chip thermal shutdown make the circuit tolerant of the
output fault conditions.
z Support Both DDR 1 (1.25VTT) and DDR 2
(0.9VTT) Requirements
z SOP-8, TO-252-5 and TO-263-5 Packages
z Capable of Sourcing and Sinking 3A Peak Current
z Current-limiting Protection
z Thermal Protection
z Integrated Power MOSFETs
z Generates Termination Voltages for SSTL-2
z High Accuracy Output Voltage at Full-Load
z Adjustable VOUT by External Resistors
z Minimum External Components
z Shutdown for Standby or Suspend Mode
Operation with High-impedance Output
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
Ordering Information
RT9173/A
Package Type
M5 : TO-263-5
L5 : TO-252-5
S : SOP-8
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
3A Sink & Source
1.5A Sink & Source
z DDR Memory Termination
z Active Termination Buses
z Supply Splitter
Pin Configurations
(TOP VIEW)
5
4
3
2
1
VOUT
REFEN
VCNTL (TAB)
GND
VIN
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.
TO-263-5 (RT9173A)
5 VOUT
4 REFEN
3 VCNTL (TAB)
2 GND
1 VIN
TO-252-5 (RT9173A)
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS9173/A-20 November 2011
VIN
GND
REFEN
VOUT
2
3
4
8 VCNTL
7 VCNTL
6 VCNTL
5 VCNTL
SOP-8 (RT9173)
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



No Preview Available !

RT9173/A
Typical Application Circuit
VCNTL = 3.3V
VIN = 2.5V
2N7002
EN
R1 VIN VCNTL
RT9173/A
REFEN
VOUT
R2 CSS
GND
CIN CCNTL
RTT
COUT
RDUMMY
R1 = R2 = 100kΩ, RTT = 50Ω / 33Ω / 25Ω
COUT(MIN) = 10μF (Ceramic) + 1000μF under the worst case testing condition
RDUMMY = 1kΩ as for VOUT discharge when VIN is not present but VCNTL is present
CSS = 1μF, CIN = 470μF (Low ESR), CCNTL = 47μF
Test Circuit
2.5V
3.3V
1.25V
VIN VCNTL
RT9173/A
REFEN
VOUT
GND
VOUT
COUT V
IL
Figure 1. Output Voltage Tolerance, ΔVLOAD
2.5V
A
3.3V
1.25V
0.2V
VIN VCNTL
RT9173/A
REFEN
VOUT
GND
VOUT
1.25V
0V
RL COUT V
RL and COUT
Time deleay
Figure 2. Current in Shutdown Mode, ISHDN
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9173/A-20 November 2011



No Preview Available !

2.5V
3.3V
1.25V
VIN VCNTL
RT9173/A
REFEN
VOUT
GND
VOUT
A
IL
COUT V
Figure 3. Current Limit for High Side, ILIMIT
RT9173/A
Power Supply
with Current Limit
2.5V
3.3V
1.25V
VIN VCNTL
RT9173/A
REFEN
VOUT
GND
A
IL
VOUT
COUT V
Figure 4. Current Limit for Low Side, ILIMIT
2.5V
1.25V
VREFEN 0.2V
1.25V
VOUT
0V
RL and COUT
Time deleay
3.3V
VIN VCNTL
RT9173/A
REFEN
VOUT
GND
RL
VOUT would be low if VREFEN < 0.2V
VOUT would be high if VREFEN > 0.8V
VOUT
COUT V
Figure 5. REFEN Pin Shutdown Threshold, VTRIGGER
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS9173/A-20 November 2011
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3



No Preview Available !

RT9173/A
Functional Pin Description
Pin Name
VIN
GND
VCNTL
REFEN
VOUT
Pin Function
Power Input Voltage
Ground
Gate Drive Voltage
Reference Voltage Input and Chip Enable
Output Voltage
Function Block Diagram
REFEN
Current
Limiting Sensor
Thermal
VCNTL
VIN
CNTL
VOUT
GND
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
4
is a registered trademark of Richtek Technology Corporation.
DS9173/A-20 November 2011



RT9173A datasheet pdf
Download PDF
RT9173A pdf
View PDF for Mobile


Related : Start with RT9173 Part Numbers by
RT9173 1.5A/3A Bus Termination Regulator RT9173
Richtek Technology Corporation
RT9173 pdf
RT9173A 1.5A/3A Bus Termination Regulator RT9173A
Richtek Technology Corporation
RT9173A pdf
RT9173B 2A Bus Termination Regulator RT9173B
Richtek
RT9173B pdf
RT9173C 2A Sink/Source Bus Termination Regulator RT9173C
Richtek Technology Corporation
RT9173C pdf

Index :   0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z   

This is a individually operated, non profit site. If this site is good enough to show, please introduce this site to others.
Since 2010   ::   HOME   ::   Privacy Policy + Contact