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PDF RT9173 Data sheet ( Hoja de datos )
| Número de pieza | RT9173 | |
| Descripción | 1.5A/3A Bus Termination Regulator | |
| Fabricantes | Richtek Technology Corporation | |
| Logotipo |  |
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® 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
1 page  
RT9173/A
Absolute Maximum Ratings
z Input Voltage --------------------------------------------------------------------------------------------------------------- 7V
z Power Dissipation -------------------------------------------------------------------------------------------------------- Internally Limited
z ESD Rating ---------------------------------------------------------------------------------------------------------------- 2kV
z Storage Temperature Range ------------------------------------------------------------------------------------------- −65°C to 150°C
z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------ 260°C
z Power Dissipation, PD @ TA = 25°C
TO-263-5 -------------------------------------------------------------------------------------------------------------------- 1.923W
TO-252-5 -------------------------------------------------------------------------------------------------------------------- 1.471W
SOP-8 ----------------------------------------------------------------------------------------------------------------------- 0.625W
z Package Thermal Resistance (Note 1)
TO-263-5, θJC ------------------------------------------------------------------------------------------------------------- 7.7°C/W
TO-252-5, θJC ------------------------------------------------------------------------------------------------------------- 8°C/W
SOP-8, θJC ----------------------------------------------------------------------------------------------------------------- 23.2°C /W
TO-263-5,θJA --------------------------------------------------------------------------------------------------------------- 52°C/W
TO-252-5, θJA -------------------------------------------------------------------------------------------------------------- 68°C/W
SOP-8, θJA ----------------------------------------------------------------------------------------------------------------- 160°C/W
Recommended Operating Conditions (Note 4)
z Input Voltage, VIN -------------------------------------------------------------------------------------------------------- 2.5V to 1.5V ± 3%
z Control Voltage, VCNTL ------------------------------------------------------------------------------------------------ 5V or 3.3V ± 5%
z Junction Temperature Range ------------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range ------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 2.5V, VCNTL = 3.3V, VREFEN = 1.25V, COUT = 10μF (Ceramic), TA = 25°C, unless otherwise specified.)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Output Offset Voltage
VOS
Load Regulation (DDR 1/2)
ΔVL OA D
Input Voltage Range (DDR 1/2)
(Note 3)
Operating Current of VCNTL
Current In Shutdown Mode
Short Circuit Protection
VIN
VCNTL
ICN TL
ISHDN
IOUT = 0A, Figure 1 (Note 2)
IL : 0A → 1.5A, Figure 1
IL : 0A → -1.5A
Keep VCNTL ≥ VIN on operation power
on and power off sequences
No Load
VREFEN < 0.2V, RL = 180Ω, Figure 2
-20 0 20
-- 0.8/1.2 2/3
-- 0.8/1.2 2/3
1.6 2.5/1.8 --
-- 3.3 6
-- 6.5 10
-- 50 90
mV
%
V
mA
μA
Current limit
IL IMIT
Over Temperature Protection
Figure 3,4
3.0 --
-- A
Thermal Shutdown Temperature TSD
Thermal Shutdown Hysteresis
3.3V ≤ VCNTL ≤ 5V
Guaranteed by design
125 150 -- °C
-- 50 -- °C
Shutdown Function
Shutdown Threshold Trigger
VTRIGGER Output = High, Figure 5
VTRIGGER Output = Low, Figure 5
0.8 --
--
V
-- -- 0.2
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS9173/A-20 November 2011
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
can be calculated as :
PD(MAX) = (125°C - 25°C) / (29°C/W) = 3.45W (TO-263-5)
Figure 11 and Figure 12 of power dissipation vs. copper
area allow the designer to see the effect of rising ambient
temperature on the maximum power allowed.
Power Dissipation vs. Copper Area
100 2S2P thermal test
90 board
80
70
TA = 65°C
TA = 55°C
60
50 TA = 25°C
40
30
20
10
0
0
SOP-8
0.5 1 1.5 2 2.5
Power Dissipation (W)
3
Figure 11. Power Dissipation vs. Copper Area of SOP-8
Package
Cooper Area vs. Power Dissipation
400
2S2P thermal test
350 board
300
250
200
150
100 TA = 65°C TA = 55°C TA = 25°C
50
TO-263-5
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
Power Dissipation (W)
Figure 12. Power Dissipation vs. Copper Area of
TO-263-5 Package
RT9173/A
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS9173/A-20 November 2011
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet RT9173.PDF ] | |
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