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  Richtek Technology Electronic Components Datasheet  

RT8207 Datasheet

Complete DDRII/DDRIII Memory Power Supply Controller

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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-onresponse 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/


  Richtek Technology Electronic Components Datasheet  

RT8207 Datasheet

Complete DDRII/DDRIII Memory Power Supply Controller

No Preview Available !

RT8207
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Typical Application Circuit
R4
620k
VIN
2.5V to 26V
VDDP
5V
C1
1µF
PGOOD
R2
100k
R1
5.1
C2
1µF
12
TON
RT8207
BOOT
22
15 VDDP
UGATE 21
R5
0
R6 0
C4
0.1µF
C9
10µF x 3
Q1
BSC09
L1
14 VDD
PHASE 20
4N035 1µH
R3
5.6k
16 CS
LGATE 19
Q2
BSC032N035
R7
C5
R8
6k
C6
13 PGOOD
FB 9
VVDDQ
1.2V
C7
220µF
VTT/VTTREF Control
10 S3
VDDQ Control
11 S5
VLDOIN 23
Discharge Mode
4 MODE
VDDQ 8
CCM/DEM
6
3 , Exposed Pad (25)
18
1
DEM
GND
PGND
VTTGND
VTT
VTTSNS
VTTREF
24
2
5
C8
10µF x 2
C3
33nF
R9 C9
10k 0.1µF
Figure A. Adjustable Voltage Regulator
R4
620k
VIN
2.5V to 26V
12
TON
RT8207
BOOT
22
VDDP
5V
C1
1µF
R1
15 VDDP
UGATE 21
5.1
14 VDD
PHASE 20
R2
100k
C2
1µF
R3
5.6k
16 CS
LGATE 19
PGOOD
13 PGOOD
VDDQ 8
VTT/VTTREF Control
10 S3
VLDOIN 23
VDDQ Control
11 S5
VTT 24
Discharge Mode
4 MODE VTTSNS 2
CCM/DEM
6 DEM
VTTREF 5
3 , Exposed Pad (25) GND
18 PGND
1 VTTGND
FB 9
R5
0
R6 0
C4
0.1µF
Q2
BSC032N035
C8
10µF x 2
Q1
BSC09
4N035
L1
1µH
VVDDQ
1.8V/1.5V
R7
C6
220µF
C5
C7
10µF x 2
C3
33nF
VDDP for DDRII
GND for DDRIII
www.richtek.com
2
Figure B. Fixed Voltage Regulator
DS8207-07 March 2011
Free Datasheet http://www.datasheet4u.com/


Part Number RT8207
Description Complete DDRII/DDRIII Memory Power Supply Controller
Maker Richtek
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RT8207 Datasheet PDF






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