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PDF RT9199 Data sheet ( Hoja de datos )
| Número de pieza | RT9199 | |
| Descripción | 2A Peak Sink/Source Bus Termination Regulator | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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RT9199
Cost-Effective, 2A Peak Sink/Source Bus Termination Regulator
General Description
The RT9199 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 2A peak while regulating
an output voltage to within 20mV. The output termination
voltage can be tightly regulated to track 1/2VDDQ by two
external voltage divider resistors or the desired output
voltage can be pro-grammed by externally forcing the
REFEN pin voltage.
The RT9199 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 shut-down protection.
The RT9199 are available in both SOP-8 and SOP-8
(Exposed Pad) surface mount packages.
Ordering Information
RT9199
Package Type
S : SOP-8
SP : SOP-8 (Exposed Pad-Option 2)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richtek Pb-free and 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.
`100%matte tin (Sn) plating.
Features
z Ideal for DDR-II VTT Applications
z Sink and Source 2A Peak Current
z Integrated Power MOSFETs
z Generate Termination Voltage for DDR Memory
Interfaces
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 and 100% Lead (Pb)-Free
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/II Memory Systems
Pin Configurations
(TOP VIEW)
VIN
GND
REFEN
VOUT
8
27
36
45
SOP-8
VCNTL
VCNTL
VCNTL
VCNTL
VIN
GND
REFEN
VOUT
8
27
3
GND
9
6
45
NC
NC
VCNTL
NC
SOP-8 (Exposed Pad)
DS9199-07 September 2007
www.richtek.com
1
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RT9199
Absolute Maximum Ratings (Note 1)
z Input Voltage, VIN ------------------------------------------------------------------------------------------------------ 6V
z Control Voltage, VCNTL ----------------------------------------------------------------------------------------------- 6V
z Power Dissipation, PD @ TA = 25°C
SOP-8 ------------------------------------------------------------------------------------------------------------------- 0.909W
SOP-8 (Exposed Pad) ---------------------------------------------------------------------------------------------- 1.176W
z Package Thermal Resistance (Note 4)
SOP-8, θJA -------------------------------------------------------------------------------------------------------------- 110° C/W
SOP-8, θJC -------------------------------------------------------------------------------------------------------------- 60° C/W
SOP-8 (Exposed Pad), θJA ------------------------------------------------------------------------------------------ 86° C/W
SOP-8 (Exposed Pad), θJC ----------------------------------------------------------------------------------------- 15° C/W
z Junction Temperature ------------------------------------------------------------------------------------------------- 125°C
z Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C
z Storage Temperature Range ---------------------------------------------------------------------------------------- –65°C to 150°C
z ESD Susceptibility (Note 2)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 3)
z Input Voltage, VIN ------------------------------------------------------------------------------------------------------ 1.6V to 5.5V
z Control Voltage, VCNTL ----------------------------------------------------------------------------------------------- 5V ± 5%
z Junction Temperature Range ---------------------------------------------------------------------------------------- −40°C to 125°C
Electrical Characteristics
(VIN = 1.8V, VCNTL = 5V, VREFEN = 0.9V, COUT = 10μF (Ceramic), TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ
Input
VCNTL Operation Current
ICNTL
IOUT = 0A
-- 1
Standby Current (Note 7)
ISTBY
VREFEN < 0.2V (Shutdown),
RLOAD = 180Ω
-- 2
Output (DDR II)
Output Offset Voltage (Note 5) VOS
IOUT = 0A
−20 --
Load Regulation (Note 6)
ΔVLOAD IOUT = +1.8A
IOUT = −1.8A
−20 --
Protection
Current limit
Thermal Shutdown Temperature
ILIMIT
TSD
VCNTL = 5V
2.0 --
125 170
Thermal Shutdown Hysteresis ΔTSD VCNTL = 5V
-- 35
REFEN Shutdown
Shutdown Threshold
VIH Enable
VIL Shutdown
0.6 --
-- --
Max Units
2.5 mA
90 μA
+20 mV
+20 mV
3.5 A
-- °C
-- °C
--
V
0.15
DS9199-07 September 2007
www.richtek.com
5
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RT9199
As shown in Figure 12, 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 12.a), θJA is 86°C/W.
Adding copper area of pad under the SOP-8 (Exposed Pad) (Figure 12.b) reduces the θJA to 73°C/W. Even further,
increasing the copper area of pad to 70mm2 (Figure 12.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 12. Thermal Resistance vs. Copper Area Layout Thermal Design
DS9199-07 September 2007
www.richtek.com
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| PDF Descargar | [ Datasheet RT9199.PDF ] | |
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