®
RT8207L/M
Complete DDRII/DDRIII/Low-Power DDRIII/DDRIV Memory
Power Supply Controller
General Description
The RT8207L/M provides a complete power supply for both DDRII/DDRIII/Low-PowerDDRIII/DDRIV memory systems. It integrates a synchronous PWM buck controller with a 1.5A sink/source tracking linear regulator and 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 RT8207L/M 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 1.5A 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 RT8207L/M 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 RT8207L/M has all of the protection features including thermal shutdown and is available in WQFN-24L 4x4 and WQFN-20L 3x3 packages.
Features
PWM Controller
Resistor Programmable Current Limit by Low Side RDS(ON) Sense
Quick Load Step Response Within 100ns
1% VVDDQ Accuracy Over Line and Load
Fixed 1.8V (DDRII), 1.5V (DDRIII) or Adjustable 0.75V to 3.3V Output Range for 1.35V (Low-Power DDRIII) and 1.2V (DDRIV)
4.5V to 26V Battery Input Range
Resistor Programmable Frequency
Over/Under Voltage Protection
Internal Current Limit Ramp Soft-Start
Drives Large Synchronous-Rectifier FETs
Power Good Indicator
1.5A LDO (VTT), Buffered Reference (VTTREF)
Capable to Sink and Source 1.5A
External Input Available to Minimize Power Losses
Integrated Divider Tracks 1/2 VDDQ for Both VTT and VTTREF
Buffered Low Noise 10mA VTTREF Output
Remote Sensing (VTTSNS)
±20mV Accuracy for Both VTTREF and VTT
Supports High-Z in S3 and Soft-Off in S4/S5
RoHS Compliant and Halogen Free
Applications
DDRI/II/III/Low-Power DDRIII/DDRIV Memory Power Supplies
Notebook Computers
SSTL18, SSTL15 and HSTL Bus Termination
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8207L/M-07 April 2014 |
www.richtek.com |
|
1 |
RT8207L/M
Ordering Information
RT8207L/M 
(2)
Pin 1 Orientation
(2) : Quadrant 2, Follow EIA-481-D
Package Type
QW : WQFN-24L 4x4 (W-Type)
QW : WQFN-20L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free) Z : ECO (Ecological Element with
Halogen Free and Pb free)
L : WQFN-24L 4x4
M : WQFN-20L 3x3
Note :
Richtek products are :
RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
RT8207LGQW
EF= : Product Code
EF=YM YMDNN : Date Code
DNN
RT8207LZQW / RT8207LZQW(2)
EF : Product Code
EF YM YMDNN : Date Code
DNN
RT8207MGQW
J7= : Product Code
J7=YM YMDNN : Date Code
DNN
RT8207MZQW
J7 : Product Code
J7 YM YMDNN : Date Code
DNN
Pin Configurations
(TOP VIEW)
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VTT VLDOIN BOOT UGATE PHASE LGATE |
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24 |
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21 |
20 |
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VTTGND |
1 |
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18 |
PGND |
VTTSNS |
2 |
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17 |
NC |
GND |
3 |
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GND |
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16 |
CS |
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MODE |
4 |
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15 |
VDDP |
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VTTREF |
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25 |
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VDD |
NC |
6 |
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13 |
PGOOD |
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11 |
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NC VDDQ FB S3 S5 |
TON |
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WQFN-24L 4x4 |
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VTT VLDOIN BOOT UGATE PHASE |
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20 19 |
18 17 16 |
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VTTGND |
1 |
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15 |
LGATE |
VTTSNS |
2 |
GND |
14 |
PGND |
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GND |
3 |
13 |
CS |
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VTTREF |
4 |
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21 |
12 |
VDDP |
VDDQ |
5 |
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11 |
VDD |
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6 |
7 |
8 |
9 |
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FB S3 S5 |
TON PGOOD |
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WQFN-20L 3x3 |
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Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
www.richtek.com |
DS8207L/M-07 April 2014 |
2 |
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RT8207L/M
Typical Application Circuit
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12 |
RT8207L |
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TON |
BOOT |
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V |
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15 |
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VDDP |
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VDDP |
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5V |
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C1 |
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R1 |
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UGATE |
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1µF |
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5.1 |
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VDD |
PHASE |
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C2 |
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R3 |
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LGATE |
19 |
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1µF |
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R2 |
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5.6k |
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100k |
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16 |
CS |
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PGOOD |
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PGOOD |
FB |
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10 |
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VTT/VTTREF Control |
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S3 |
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11 |
VLDOIN |
23 |
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VDDQ Control |
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S5 |
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4 |
VDDQ |
8 |
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Discharge Mode |
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MODE |
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VTT |
24 |
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3 |
, 25 (Exposed Pad) |
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GND |
2 |
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18 |
VTTSNS |
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PGND |
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1 |
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VTTGND |
VTTREF |
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V |
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IN |
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R |
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4.5V to 26V |
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TON |
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620k |
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R5 |
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C9 |
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10µF x |
3 |
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0 |
C4 |
V |
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0.1µF |
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VDDQ |
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R6 |
0 |
Q1 |
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1.2V |
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BSC09 |
L1 |
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4N03S |
1µH |
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R7* |
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C7 |
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Q2 |
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220µF |
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BSC032N03S |
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C5* |
R8 |
C6* |
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6k |
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* : Optional |
R9 |
C9 |
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10k |
0.1µF |
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V |
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TT |
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C8 |
0.6V |
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10µF x 2 |
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C3 |
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33nF |
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Figure 1. Adjustable Voltage Regulator for RT8207L
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12 |
V |
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15 |
VDDP |
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5V |
C1 |
R1 |
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5.1 |
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1µF |
14 |
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C2 |
R3 |
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R2 |
1µF |
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5.6k |
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100k |
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16 |
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PGOOD |
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13 |
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VTT/VTTREF Control |
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10 |
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11 |
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VDDQ Control |
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4 |
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Discharge Mode |
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3 , 25 (Exposed Pad) |
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18 |
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1 |
RT8207L |
22 |
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TON |
BOOT |
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VDDP |
UGATE |
21 |
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VDD |
PHASE |
20 |
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19 |
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LGATE |
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CS |
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PGOOD |
VDDQ |
8 |
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23 |
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S3 |
VLDOIN |
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S5 |
VTT |
24 |
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2 |
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MODE |
VTTSNS |
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VTTREF |
5 |
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GND |
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PGND |
FB |
9 |
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VTTGND |
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V |
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IN |
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26V |
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R |
4.5V to |
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TON |
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620k |
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R5 |
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C8 |
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10µF x |
2 |
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0 |
C4 |
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V |
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0.1µF |
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VDDQ |
R6 |
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Q1 |
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1.8V/1.5V |
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0 |
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BSC09 |
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L1 |
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4N03S |
1µH |
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R7* |
C6 |
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Q2 |
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220µF |
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BSC032N03S |
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C5* |
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* |
: Optional |
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V |
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TT |
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C7 |
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0.9V/0.75V |
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10µF x 2 |
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C3 |
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33nF |
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V |
VDDP |
for DDRII |
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GND for DDRIII |
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Figure 2. Fixed Voltage Regulator for RT8207L
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8207L/M-07 April 2014 |
www.richtek.com |
|
3 |
RT8207L/M
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9 |
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V |
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12 |
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VDDP |
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5V |
R1 |
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C1 |
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5.1 |
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1µF |
11 |
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C2 |
R3 |
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R2 |
1µF |
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5.6k |
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100k |
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13 |
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PGOOD |
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10 |
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VTT/VTTREF Control |
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7 |
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8 |
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VDDQ Control |
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3 |
, 21 (Exposed Pad) |
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14 |
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1 |
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RT8207M |
18 |
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TON |
BOOT |
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VDDP |
UGATE |
17 |
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VDD |
PHASE |
16 |
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15 |
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LGATE |
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CS |
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6 |
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PGOOD |
FB |
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S3 |
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19 |
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S5 |
VLDOIN |
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5 |
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VDDQ |
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GND |
VTT |
20 |
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2 |
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VTTSNS |
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PGND |
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4 |
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VTTGND |
VTTREF |
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V |
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IN |
26V |
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R |
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4.5V to |
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TON |
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620k |
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R5 |
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C9 |
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10µF x |
3 |
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0 |
C4 |
V |
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0.1µF |
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VDDQ |
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R6 |
0 |
Q1 |
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1.2V |
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BSC09 |
L1 |
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4N03S |
1µH |
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R7* |
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C7 |
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Q2 |
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220µF |
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BSC032N03S |
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C5* |
R8 |
C6* |
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6k |
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* : Optional |
R9 |
C9 |
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10k |
0.1µF |
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V |
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TT |
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C8 |
0.6V |
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10µF x 2 |
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C3 |
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33nF |
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Figure 3. Adjustable Voltage Regulator for RT8207M
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9 |
V |
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12 |
VDDP |
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5V |
C1 |
R1 |
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5.1 |
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1µF |
11 |
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C2 |
R3 |
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R2 |
1µF |
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5.6k |
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100k |
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13 |
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PGOOD |
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10 |
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VTT/VTTREF Control |
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7 |
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8 |
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VDDQ Control |
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3 , 21 (Exposed Pad) |
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14 |
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1 |
RT8207M |
18 |
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TON |
BOOT |
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VDDP |
UGATE |
17 |
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VDD |
PHASE |
16 |
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15 |
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LGATE |
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CS |
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PGOOD |
VDDQ |
5 |
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19 |
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S3 |
VLDOIN |
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S5 |
VTT |
20 |
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2 |
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VTTSNS |
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VTTREF |
4 |
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GND |
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PGND |
FB |
6 |
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VTTGND |
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V |
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IN |
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26V |
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R |
4.5V to |
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TON |
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620k |
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R5 |
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C8 |
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10µF x 2 |
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0 |
C4 |
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V |
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0.1µF |
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VDDQ |
R6 |
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Q1 |
1.8V/1.5V |
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0 |
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BSC09 |
L1 |
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4N03S |
1µH |
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R7* |
C6 |
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Q2 |
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220µF |
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BSC032N03S |
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C5* |
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* : |
Optional |
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V |
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TT |
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C7 |
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0.9V/0.75V |
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10µF x 2 |
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C3 |
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33nF |
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V |
VDDP |
for DDRII |
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GND for DDRIII |
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Figure 4. Fixed Voltage Regulator for RT8207M
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
www.richtek.com |
DS8207L/M-07 April 2014 |
4 |
|
RT8207L/M
Functional Pin Description
Pin No. |
Pin Name |
Pin Function |
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WQFN-24L 4x4 |
WQFN-20L 3x3 |
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1 |
1 |
VTTGND |
Power Ground Output for VTT LDO. |
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2 |
2 |
VTTSNS |
Voltage Sense Input for VTT LDO. Connect to the terminal of |
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the VTT LDO output capacitor. |
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3, |
3, |
GND |
Analog Ground. The exposed pad must be soldered to a large |
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25 (Exposed Pad) |
21 (Exposed Pad) |
PCB and connected to GND for maximum thermal dissipation. |
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Output Discharge Mode Setting. Connect to VDDQ for tracking |
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4 |
-- |
MODE |
discharge. Connect to GND for non-tracking discharge. |
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Connect to VDD for no discharge. |
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5 |
4 |
VTTREF |
Buffered Reference Output. |
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6, 7, 17 |
-- |
NC |
No Internal Connection. |
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Reference Input for VTT and VTTREF. Discharge current |
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8 |
5 |
VDDQ |
sinking terminal for VDDQ non-tracking discharge. Output |
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voltage feedback input for VDDQ output if the FB pin is |
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connected to VDD or GND. |
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VDDQ Output Setting. Connect to GND for DDR3 (VVDDQ = |
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9 |
6 |
FB |
1.5V) power supply. Connect to VDD for DDR2 (VVDDQ = 1.8V) |
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power supply. Or connect to a resistive voltage divider from |
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VDDQ to GND to adjust the output of PWM from 0.75V to 3.3V. |
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10 |
7 |
S3 |
S3 Signal Input. |
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11 |
8 |
S5 |
S5 Signal Input |
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Set the UGATE on time through a pull-up resistor connecting to |
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12 |
9 |
TON |
VIN. Output discharge mode setting pin for RT8207M. Connect |
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RTON to VIN for non-tracking discharge. |
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13 |
10 |
PGOOD |
Power Good Open Drain Output. In High state when VDDQ |
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output voltage is within the target range. |
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14 |
11 |
VDD |
Supply Input for Analog Supply. |
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15 |
12 |
VDDP |
Supply Input for LGATE Gate Driver. |
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16 |
13 |
CS |
Current Limit Threshold Setting Input. Connect to VDD through |
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the voltage setting resistor. |
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18 |
14 |
PGND |
Power Ground for Low Side MOSFET. |
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19 |
15 |
LGATE |
Low Side Gate Driver Output for VDDQ. |
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Switch Node. External inductor connection for VDDQ and |
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20 |
16 |
PHASE |
behave as the current sense comparator input for Low Side |
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MOSFET RDS(ON) sensing. |
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21 |
17 |
UGATE |
High Side Gate Driver Output for VDDQ. |
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22 |
18 |
BOOT |
Boost Flying Capacitor Connection for VDDQ. |
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23 |
19 |
VLDOIN |
Power Supply for VTT LDO. |
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24 |
20 |
VTT |
Power Output for VTT LDO. |
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Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8207L/M-07 April 2014 |
www.richtek.com |
|
5 |
RT8207L/M
Function Block Diagram
|
TRIG |
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VDDQ |
On-time |
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BOOT |
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Compute |
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TON |
1-SHOT |
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R |
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Comp |
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- |
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PWM |
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0.75V VREF |
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+ |
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S |
Q |
DRV |
UGATE |
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Min. TOFF |
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PHASE |
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Latch |
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+ |
OV |
Q |
TRIG |
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VDDP |
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115%VREF |
S1 |
Q |
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- |
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1-SHOT |
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FB |
+ |
UV |
Latch |
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DRV |
LGATE |
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S1 |
Q |
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70% VREF |
- |
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PGND |
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Diode |
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- |
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Emulation |
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90% VREF |
+ |
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Thermal |
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+ |
+ |
CS |
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VDD |
SS Timer |
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GM |
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Shutdown |
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+ |
- |
10µA |
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- |
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S5 |
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SS Int. |
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PGOOD |
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Buck Controller for RT8207L/M
|
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VDDQ |
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S5 |
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S3 |
Discharge |
Thermal |
VTTREF |
|
Mode |
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Select |
Shutdown |
VLDOIN |
|
MODE |
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+ |
+ |
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- |
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- |
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+ |
VTT |
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- |
+ |
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- |
VTTSNS |
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- |
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GND |
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110% VVTTREF |
+ |
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90% VVTTREF |
- |
VTTGND |
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|||
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+ |
|
VTT LDO for RT8207L
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
www.richtek.com |
DS8207L/M-07 April 2014 |
6 |
|
|
|
|
|
RT8207L/M |
|
|
VDDQ |
|
|
S5 |
|
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S3 |
Non-tracking |
Thermal |
VTTREF |
|
Discharge |
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Shutdown |
VLDOIN |
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+ |
+ |
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- |
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- |
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+ |
VTT |
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- |
+ |
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- |
VTTSNS |
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- |
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GND |
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110% VVTTREF |
+ |
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90% VVTTREF |
- |
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VTTGND |
||
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+ |
|
VTT LDO for RT8207M
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8207L/M-07 April 2014 |
www.richtek.com |
|
7 |
RT8207L/M
Absolute Maximum Ratings (Note 1)
Supply Input Voltage, TON to GND ------------------------------------------------------------------------------------- |
−0.3V to 32V |
BOOT to PHASE ----------------------------------------------------------------------------------------------------------- |
−0.3V to 6V |
VDD, VDDP, CS, MODE, S3, S5, VTTSNS, VDDQ, VTTREF, VTT, VLDOIN, |
−0.3V to 6V |
FB, PGOOD to GND ------------------------------------------------------------------------------------------------------- |
|
PGND, VTTGND to GND -------------------------------------------------------------------------------------------------- |
−0.3V to 0.3V |
PHASE to GND |
|
DC ------------------------------------------------------------------------------------------------------------------------------ |
–1V to 32V |
< 20ns ------------------------------------------------------------------------------------------------------------------------ |
−8V to 38V |
LGATE to GND |
|
DC ------------------------------------------------------------------------------------------------------------------------------ |
–0.3V to 6V |
< 20ns ------------------------------------------------------------------------------------------------------------------------ |
−2.5V to 7.5V |
UGATE to PHASE |
|
DC ------------------------------------------------------------------------------------------------------------------------------ |
–0.3V to 6V |
< 20ns ------------------------------------------------------------------------------------------------------------------------ |
−5V to 7.5V |
The Other Pins -------------------------------------------------------------------------------------------------------------- |
−0.3V to 6.5V |
Power Dissipation, PD @ TA = 25°C |
|
WQFN-24L 4x4 ------------------------------------------------------------------------------------------------------------- |
1.923W |
WQFN-20L 3x3 ------------------------------------------------------------------------------------------------------------- |
1.471W |
Package Thermal Resistance (Note 2) |
|
WQFN-24L 4x4, θJA -------------------------------------------------------------------------------------------------------- |
52°C/W |
WQFN-24L 4x4, θJC ------------------------------------------------------------------------------------------------------- |
7°C/W |
WQFN-20L 3x3, θJA -------------------------------------------------------------------------------------------------------- |
68°C/W |
WQFN-20L 3x3, θJC ------------------------------------------------------------------------------------------------------- |
7.5°C/W |
Junction Temperature ------------------------------------------------------------------------------------------------------ |
150°C |
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------- |
260°C |
Storage Temperature Range --------------------------------------------------------------------------------------------- |
−65°C to 150°C |
ESD Susceptibility (Note 3) |
|
HBM (Human Body Model) ----------------------------------------------------------------------------------------------- |
2kV |
MM (Machine Model) ------------------------------------------------------------------------------------------------------ |
200V |
Recommended Operating Conditions |
(Note 4) |
Supply Input Voltage, VIN ------------------------------------------------------------------------------------------------ |
4.5V to 26V |
Control Voltage, VDD, VVDDP --------------------------------------------------------------------------------------------- |
4.5V to 5.5V |
Junction Temperature Range --------------------------------------------------------------------------------------------- |
−40°C to 125°C |
Ambient Temperature Range --------------------------------------------------------------------------------------------- |
−40°C to 85°C |
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
www.richtek.com |
DS8207L/M-07 April 2014 |
8 |
|
RT8207L/M
Electrical Characteristics
(VIN = 15V, VDD = VVDDP = 5V, RTON = 1MΩ, TA = 25°C, unless otherwise specified)
Parameter |
Symbol |
Test Conditions |
Min |
Typ |
Max |
|
Unit |
|
PWM Controller |
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Quiescent Supply Current |
|
FB forced above the regulation point, |
-- |
470 |
1000 |
|
A |
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(VDD + VDDP) |
|
VS5 = 5V, VS3 = 0V |
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TON Operating Current |
|
RTON = 1M |
|
-- |
15 |
-- |
|
A |
IVLDOIN BIAS Current |
|
VS5 = VS3 = 5V, VTT = No Load |
-- |
1 |
-- |
|
A |
|
IVLDOIN Standby Current |
|
VS5 = 5V, VS3 = 0V, VTT = No Load |
-- |
0.1 |
10 |
|
A |
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VDD + VVDDP |
|
-- |
1 |
10 |
|
|
Shutdown Current |
ISHDN |
TON |
|
-- |
0.1 |
5 |
|
A |
(VS5 = VS3 = 0V) |
S5/S3 = 0V |
|
|
0.1 |
1 |
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1 |
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IVLDOIN |
|
-- |
0.1 |
1 |
|
|
FB Reference Voltage |
VREF |
VDD = 4.5V to 5.5V |
|
0.742 |
0.75 |
0.758 |
|
V |
Fixed VDDQ Output |
|
FB = GND |
|
-- |
1.5 |
-- |
|
V |
Voltage |
|
FB = VDD |
|
-- |
1.8 |
-- |
|
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|||||
FB Input Bias Current |
|
FB = 0.75V |
|
1 |
0.1 |
1 |
|
A |
VDDQ Voltage Range |
|
|
|
0.75 |
-- |
3.3 |
|
V |
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On-Time |
|
RTON = 1M , VVDDQ = 1.25V |
267 |
334 |
401 |
|
ns |
|
Minimum Off-Time |
|
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|
250 |
400 |
550 |
|
ns |
VDDQ Input Resistance |
|
|
|
-- |
100 |
-- |
|
k |
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VDDQ Shutdown |
|
VS5 = GND |
|
-- |
15 |
-- |
|
|
Discharge Resistance |
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|
|||||
Current Sensing |
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CS Sink Current |
|
VCS > 4.5V, After UV Blank Time |
9 |
10 |
11 |
|
A |
|
Current Comparator |
|
GND PHASE, RCS = 5k |
15 |
-- |
15 |
|
mV |
|
Offset |
|
|
||||||
Zero Crossing Threshold |
|
GND PHASE |
|
5 |
-- |
10 |
|
mV |
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Fault Protection |
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Current Limit (Positive) |
|
GND PHASE, RCS = 5k |
35 |
50 |
65 |
|
mV |
|
|
GND PHASE, RCS = 20k |
170 |
200 |
230 |
|
|||
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|
|||||
Under Voltage Protection |
VUVP |
|
|
60 |
70 |
80 |
|
% |
Threshold |
|
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|
|||||
Over Voltage Protection |
VOVP |
With respect to error comparator |
110 |
115 |
120 |
|
% |
|
Threshold |
threshold |
|
|
|||||
Over Voltage Fault Delay |
|
FB forced above over voltage |
-- |
20 |
-- |
|
s |
|
|
threshold |
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|||||
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VDD POR Threshold |
|
Rising edge, hysteresis = 120mV, |
3.9 |
4.2 |
4.5 |
|
V |
|
|
PWM disabled below this level |
|
||||||
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Under Voltage Blank Time |
|
From S5 signal going high |
-- |
5 |
-- |
|
ms |
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|
Thermal Shutdown |
TSD |
|
|
-- |
165 |
-- |
|
°C |
Thermal Shutdown |
TSD |
|
|
-- |
10 |
-- |
|
°C |
Hysteresis |
|
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|
|||||
|
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|
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|
|
|
|
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
|
||||||
DS8207L/M-07 April 2014 |
www.richtek.com |
|
9 |
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