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PDF RT9045 Data sheet ( Hoja de datos )
| Número de pieza | RT9045 | |
| Descripción | 1.8A Sink/Source Bus Termination Regulator | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT9045
Cost-Effective, 1.8A Sink/Source Bus Termination Regulator
General Description
The RT9045 is a simple, cost-effective and high-speed
linear regulator designed to generate termination voltage
in Double Data Rate (DDR) memory system to comply
with the devices requirements. The regulator is capable of
actively sinking or sourcing up to 1.8A while regulating an
output voltage to within 20mV. The output termination
voltage can be tightly regulated to track VDDQ / 2 by two
external voltage divider resistors or the desired output
voltage can be programmed by externally forcing the
REFEN pin voltage.
The RT9045 also incorporates a high-speed differential
amplifier to provide ultra-fast response in line/load transient.
Other features include extremely low initial offset voltage,
excellent load regulation, current limiting in bi-directions
and on-chip thermal shutdown protection.
Ordering Information
RT9045
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
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.
Marking Information
RT9045GSP
RT9045
GSPYMDNN
RT9045GSP : Product Number
YMDNN : Date Code
Features
z Ideal for DDR VTT Applications
z Sink and Source Current :
DDRII 1.8A Sink/Source @ VIN = 1.8V
DDRIII 1.5A Sink/Source @ VIN = 1.5V
LPDDRIII 1.2A Sink/Source @ VIN = 1.35V
DDRIV 1.2A Sink/Source @ VIN = 1.2V
z Integrated Power MOSFETs
z Generate Termination Voltage for DDR Memory
Interfaces
z Stable with Output Ceramic Capacitor
z High Accuracy Output Voltage at Full-Load
z Output Adjustment by Two External Resistors
z Low External Component Count
z Shutdown for Suspend to RAM (STR) Functionality
with High Impedance Output
z Current Limiting Protection
z On-Chip Thermal Protection
z RoHS Compliant
Applications
z Desktop PCs, Notebooks, and Workstations
z Graphics Card Memory Termination
z Set Top Boxes, Digital TVs, Printers
z Embedded Systems
z Active Termination Buses
z DDR Memory Systems
Pin Configurations
(TOP VIEW)
VIN
GND
REFEN
VOUT
8
2
3
GND
9
7
6
45
NC
NC
VCNTL
NC
SOP-8 (Exposed Pad)
RT9045ZSP
RT9045
ZSPYMDNN
RT9045ZSP : Product Number
YMDNN : Date Code
DS9045-04 August 2011
www.richtek.com
1
Free Datasheet http://www.datasheet4u.com/
1 page  
RT9045
Absolute Maximum Ratings (Note 1)
z Input Voltage, VIN ------------------------------------------------------------------------------------------------------------ −0.3V to 6V
z Control Voltage, VCNTL ----------------------------------------------------------------------------------------------------- −0.3V to 6V
z Reference Input Voltage, VREFEN ----------------------------------------------------------------------------------------- −0.3V to 6V
z Output Voltage, VOUT ------------------------------------------------------------------------------------------------------- −0.3V to 6V
z Power Dissipation, PD @ TA = 25°C
SOP-8 (Exposed Pad) ----------------------------------------------------------------------------------------------------- 1.163W
z Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad), θJA ------------------------------------------------------------------------------------------------ 86°C/W
SOP-8 (Exposed Pad), θJC ----------------------------------------------------------------------------------------------- 15°C/W
z Junction Temperature ------------------------------------------------------------------------------------------------------- 150°C
z Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------------- 260°C
z Storage Temperature Range ---------------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------------ 2kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 4)
z Input Voltage, VIN ------------------------------------------------------------------------------------------------------------ 1V to 5.5V
z Control Voltage, VCNTL ----------------------------------------------------------------------------------------------------- 5V ± 5%
z Junction Temperature Range ---------------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range ---------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 1.8V / 1.5V, VCNTL = 5V, VREFEN = 0.9V / 0.75V, COUT = 10μF (Ceramic), TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Input
VCNTL Operation Current
VCNTL Power on Reset
ICNTL
VPOR
IOUT = 0A
VCNTL Rising
-- 0.7 2.5 mA
-- 3.6 -- V
Standby Current (Note 5) ISTBY VREFEN < 0.2V (Shutdown), RLOAD = 180Ω -- 20 90 μA
Output
Output Offset Voltage
(Note 6)
VOS
IOUT = 0A
VIN = 1.8V, VREFEN = 0.9V, IOUT = ±1.8A
−13 -- 13 mV
Load Regulation
(Note 7) ΔVLOAD
VIN = 1.5V, VREFEN = 0.75V, IOUT = ±1.5A
VIN = 1.35V, VREFEN = 0.675V, IOUT = ±1.2A
−13
--
13 mV
VIN = 1.2V, VREFEN = 0.6V, IOUT = ±1.2A
Protection
Source
Current Limit
Sink
ILIMITsr
ILIMITsk
VIN = 1.8V, VREFEN = 0.9V
VIN = 1.5V, VREFEN = 0.75V
VIN = 1.8V, VREFEN = 0.9V
VIN = 1.5V, VREFEN = 0.75V
1.8 -- 3.5 A
1.8 -- 3.5 A
DS9045-04 August 2011
To be continued
www.richtek.com
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
Exposed Pad
W≦2.28mm
Figure 12. Dog-Bone Layout
RT9045
As shown in Figure 13, the amount of copper area to which
the SOP-8 (Exposed Pad) is mounted affects thermal
performance. When mounted to the standard SOP-8
(Exposed Pad) pad of 2 oz. copper (Figure 13.a), θJA is
86°C/W. Adding copper area of pad under the SOP-8
(Exposed Pad) (Figure 13.b) reduces the θJA to 73°C/W.
Even further, increasing the copper area of pad to 70mm2
(Figure 13.d) reduces the θJA to 65°C/W.
(a) Copper Area = 10mm2, θJA = 86°C/W
(b) Copper Area = 30mm2, θJA = 73°C/W
(c) Copper Area = 50mm2, θJA = 68°C/W
(d) Copper Area = 70mm2, θJA = 65°C/W
Figure 13. Thermal Resistance vs. Copper Area Layout
Thermal Design
DS9045-04 August 2011
www.richtek.com
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT9045.PDF ] | |
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