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PDF RT8207 Data sheet ( Hoja de datos )
| Número de pieza | RT8207 | |
| Descripción | Complete DDRII/DDRIII Memory Power Supply Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT8207
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.
Ordering Information
RT8207
Package Type
QW : WQFN-24L 4x4 (W-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
DS8207-07 March 2011
Features
z PWM Controller
` Resistor Programmable Current Limit by Low-Side
RDS(ON) Sense
` Quick Load-Step Response within 100ns
` 1% VOUT 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
z 3A LDO (VTT), Buffered Reference (VTTREF)
` Capable to Sink and Source Up to 3A
` LDO Input Available to Optimize Power Losses
` Requires Only 20μF 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
z RoHS Compliant and Halogen Free
Applications
z DDRII/DDRIII Memory Power Supplies
z Notebook Computers
z SSTL18, SSTL15 and HSTL Bus Termination
Pin Configurations
(TOP VIEW)
VTTGND
VTTSNS
GND
MODE
VTTREF
DEM
24 23 22 21 20 19
1 18
2 17
3
GND
16
4 15
5 25 14
6 13
7 8 9 10 11 12
PGND
NC
CS
VDDP
VDD
PGOOD
WQFN-24L 4x4
www.richtek.com
1
Free Datasheet http://www.datasheet4u.com/
1 page  
RT8207
Absolute Maximum Ratings (Note 1)
z Input Voltage, TON to GND ---------------------------------------------------------------------------------------------- –0.3V to 32V
z BOOT to GND -------------------------------------------------------------------------------------------------------------- –0.3V to 38V
z PHASE to GND
DC ----------------------------------------------------------------------------------------------------------------------------- −0.3V to 32V
<20ns ------------------------------------------------------------------------------------------------------------------------ −8V to 38V
z PHASE to BOOT ---------------------------------------------------------------------------------------------------------- –6V to 0.3V
z VDD, VDDP, CS, MODE, S3, S5, VTTSNS, VDDQ, DEM to GND -------------------------------------------- –0.3V to 6V
z VTTREF, VTT, VLDOIN, FB, PGOOD to GND ---------------------------------------------------------------------- –0.3V to 6V
z UGATE to PHASE
DC ----------------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
<20ns ------------------------------------------------------------------------------------------------------------------------ −5V to 7.5V
z LGATE to GND
DC ----------------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
<20ns ------------------------------------------------------------------------------------------------------------------------ −2.5V to 7.5V
z PGND, VTTGND to GND ------------------------------------------------------------------------------------------------- –0.3V to 0.3V
z Power Dissipation, PD @ TA = 25°C
WQFN-24L 4x4 ----------------------------------------------------------------------------------------------------------- 1.923W
z Package Thermal Resistance (Note 2)
WQFN-24L 4x4, θJA ------------------------------------------------------------------------------------------------------- 52°C/W
WQFN-24L 4x4, θJC ------------------------------------------------------------------------------------------------------ 7°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 ---------------------------------------------------------------------------------------------------------- 2.5V to 26V
z Control Voltage, VDDP, VDD ---------------------------------------------------------------------------------------------- 4.5V to 5.5V
z Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VDDP = VDD = 5V, VIN = 15V, DEM = VDD , RTON = 1MΩ, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
PWM Controller
Quiescent Supply Current
(VDD + VDDP)
TON Operating Current
IVLDOIN BIAS Current
IVLDOIN Standby Current
FB forced above the regulation point,
VS5 = 5V, VS3 = 0V
RTON = 1MΩ
VS5 = VS3 = 5V, VTT = No Load
VS5 = 5V, VS3= 0, VTT = No Load
--
--
--
--
DS8207-07 March 2011
Typ Max Unit
470 1000 μA
15 -- μA
1 -- μA
0.1 10 μA
To be continued
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Free Datasheet http://www.datasheet4u.com/
5 Page 
RT8207
VDDQ Output Voltage vs. Output Current
1.845
DDRII, VIN = 12V, VDDQ = 1.8V, S3 = GND, S5 = VDDP
1.840
1.835
1.830
1.825
DEM
PWM
1.820
1.815
0.001
0.01 0.1
1
Output Current (A)
10
0.9130
0.9125
VTT Output Voltage vs. Output Current
DDRII, VIN = 12V, VDDQ = 1.8V, S3 = S5 = VDDP
0.9120
0.9115
0.9110
0.9105
0.9100
0.9095
0.9090
-2 -1.6 -1.2 -0.8 -0.4 0 0.4 0.8 1.2 1.6
Output Current (A)
2
VTTREF Output Voltage vs. Output Current
0.918
DDRII, VIN = 12V, VDDQ = 1.8V, S3 = S5 = VDDP
0.916
0.914
0.912
0.910
0.908
0.906
0.904
0.902
-10 -8 -6 -4 -2 0 2 4 6 8 10
Output Current (mA)
DS8207-07 March 2011
VDDQ Output Voltage vs. Output Current
1.540
DDRIII, VIN = 12V, VDDQ = 1.5V, S3 = GND, S5 = VDDP
1.535
1.530
1.525
1.520
DEM
PWM
1.515
0.001
0.01 0.1
1
Output Current (A)
10
0.7635
0.7630
VTT Output Voltage vs. Output Current
DDRIII, VIN = 12V, VDDQ = 1.5V, S3 = S5 = VDDP
0.7625
0.7620
0.7615
0.7610
0.7605
0.7600
-2 -1.6 -1.2 -0.8 -0.4 0 0.4 0.8 1.2 1.6
Output Current (A)
2
VTTREF Output Voltage vs. Output Current
0.768
DDRIII, VIN = 12V, VDDQ = 1.5V, S3 = S5 = VDDP
0.766
0.764
0.762
0.760
0.758
0.756
0.754
-10 -8 -6 -4 -2 0 2 4 6 8 10
Output Current (mA)
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Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet RT8207.PDF ] | |
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