RT8207
Complete DDRII/DDRIII Memory Power Supply Controller
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
The RT8207 has all of the protection features including |
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thermal shutdown and is available in the WQFN-24L 4x4 |
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(TOP VIEW) |
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package. |
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VTT |
VLDOIN |
BOOT |
UGATE |
PHASE |
LGATE |
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Ordering Information |
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23 |
22 |
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20 |
19 |
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RT8207 |
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VTTGND |
1 |
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18 |
PGND |
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Package Type |
VTTSNS |
2 |
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NC |
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GND |
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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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QW : WQFN-24L 4x4 (W-Type) |
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VTTREF |
5 |
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25 |
14 |
VDD |
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Lead Plating System |
DEM |
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PGOOD |
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8 |
9 |
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11 |
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G : Green (Halogen Free and Pb Free) |
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Note : |
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VDDQ |
FB |
S3 |
S5 |
TON |
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Richtek products are : |
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WQFN-24L 4x4 |
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` RoHS compliant and compatible with the current require- |
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ments of IPC/JEDEC J-STD-020. |
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` Suitable for use in SnPb or Pb-free soldering processes. |
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DS8207-07 March 2011 |
www.richtek.com |
1
RT8207
Marking Information
For marking information, contact our sales representative directly or through a Richtek distributor located in your area.
Typical Application Circuit
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12 |
RT8207 |
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TON |
BOOT |
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15 |
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VDDP |
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VDDP |
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5V |
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UGATE |
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C1 |
R1 |
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5.1 |
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1µF |
14 |
VDD |
PHASE |
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C2 |
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R3 |
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LGATE |
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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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13 |
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PGOOD |
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PGOOD |
FB |
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VTT/VTTREF Control |
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S3 |
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11 |
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VDDQ Control |
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S5 |
VLDOIN |
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4 |
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Discharge Mode |
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MODE |
VDDQ |
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6 |
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CCM/DEM |
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DEM |
VTT |
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3 , Exposed Pad (25) |
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GND |
VTTSNS |
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18 |
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PGND |
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1 |
VTTREF |
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VTTGND |
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V |
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IN |
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R4 |
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2.5V to 26V |
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620k |
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R5 |
C9 |
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10µF x 3 |
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22 |
0 |
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C4 |
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V |
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0.1µF |
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VDDQ |
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1.2V |
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21 |
R6 |
0 |
Q1 |
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BSC09 |
L1 |
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20 |
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4N035 |
1µH |
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19 |
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R7 |
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C7 |
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Q2 |
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220µF |
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BSC032N035 |
C5 |
R8 |
C6 |
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6k |
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9 |
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R9 |
C9 |
23 |
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10k |
0.1µF |
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8 |
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24 |
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2 |
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C8 |
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10µF x 2 |
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5 |
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C3 |
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33nF |
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Figure A. Adjustable Voltage Regulator
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12 |
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VDDP |
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15 |
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5V |
R1 |
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C1 |
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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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PGOOD |
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VTT/VTTREF Control |
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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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6 |
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CCM/DEM |
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, Exposed Pad (25) |
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3 |
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18 |
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1 |
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V |
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IN |
26V |
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R4 |
2.5V to |
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620k |
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R5 |
C8 |
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RT8207 |
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10µF x 2 |
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22 |
0 |
C4 |
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TON |
BOOT |
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V |
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0.1µF |
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VDDQ |
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VDDP |
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Q1 |
1.8V/1.5V |
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21 |
R6 |
0 |
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UGATE |
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BSC09 |
L1 |
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VDD |
PHASE |
20 |
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4N035 |
1µH |
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19 |
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C6 |
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LGATE |
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R7 |
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Q2 |
220µF |
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BSC032N035 |
C5 |
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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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C7 |
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MODE |
VTTSNS |
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10µF x 2 |
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5 |
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DEM |
VTTREF |
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C3 |
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GND |
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33nF |
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PGND |
FB |
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VDDP for DDRII |
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VTTGND |
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GND for DDRIII |
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Figure B. Fixed Voltage Regulator |
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www.richtek.com |
DS8207-07 March 2011 |
2 |
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RT8207
Function Block Diagram
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TRIG |
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VDDQ |
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On-time |
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Compute |
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TON |
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1-SHOT |
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R |
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BOOT |
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+ |
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Comp |
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-GM |
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- |
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S |
Q |
PWM |
DRV |
UGATE |
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+ |
- |
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+ |
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Min. TOFF |
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PHASE |
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VREF 0.75V |
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Q |
TRIG |
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VDDP |
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Latch |
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1-SHOT |
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+ |
OV |
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115% VREF |
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S1 |
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Q |
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DRV |
LGATE |
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- |
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FB |
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- |
UV |
Latch |
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PGND |
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70% VREF |
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S1 |
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Q |
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Diode |
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+ |
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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 |
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SS Timer |
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GM |
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Shutdown |
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- |
+ |
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S5 |
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VDD |
10µA |
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PWM |
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DEM |
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PGOOD |
S3 |
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Discharge |
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VTTREF |
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Mode |
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MODE |
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VLDOIN |
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Select |
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- |
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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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+ |
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- |
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VTTSNS |
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110% VVTTREF |
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GND |
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90% VVTTREF |
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VTTGND |
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DS8207-07 |
March |
2011 |
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www.richtek.com |
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3 |
RT8207
Functional Pin Description
Pin No. |
Pin Name |
Pin Function |
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1 |
VTTGND |
Power Ground for the VTT_LDO. |
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2 |
VTTSNS |
Voltage Sense Input for the VTT_LDO. Connect to the terminal of the VTT_LDO |
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output capacitor |
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GND |
Analog Ground. The exposed pad must be soldered to a large PCB and |
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25 (Exposed Pad) |
connected to GND for maximum power dissipation. |
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4 |
MODE |
Output Discharge Mode Setting Pin. Connect to VDDQ for tracking discharge. |
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Connect to GND for non-tracking discharge. Connect to VDD for no discharge. |
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5 |
VTTREF |
VTTREF Buffered Reference Output. |
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DEM |
Diode-Emulation Mode Enable Pin. Connect to VDD will enable diode-emulation |
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mode. Connect to GND will always operate in forced CCM mode. |
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7, 17 |
NC |
No Internal Connection. |
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VDDQ Reference Input for VTT and VTTREF. Discharge current sinking terminal |
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8 |
VDDQ |
for VDDQ non-tracking discharge. Output voltage feedback input for VDDQ |
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output if FB pin is connected to VDD or GND |
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VDDQ Output Setting Pin. Connect to GND for DDRIII (VDDQ = 1.5V) power |
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9 |
FB |
supply. The pin should be connect to VDD for DDRII (VDDQ = 1.8V) power supply |
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or be connected to a resistive voltage divider from VDDQ to GND to adjust the |
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output of PWM from 0.75V to 3.3V. |
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10 |
S3 |
S3 Signal Input. |
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11 |
S5 |
S5 Signal Input |
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12 |
TON |
The pin is used to set the UGATE on time through a pull-up resistor connecting to |
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VIN. |
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13 |
PGOOD |
Power-Good Open-Drain Output. This pin will be in HIGH state when VDDQ |
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output voltage is within the target range. |
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14 |
VDD |
Supply Input for the Analog Supply. |
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15 |
VDDP |
Supply Input for the Low Gate Driver. |
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16 |
CS |
Current Limit Threshold Setting Input. Connect this pin to VDD through the |
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voltage setting resistor. |
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18 |
PGND |
Power Ground for Low-Side MOSFET. |
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19 |
LGATE |
Low-Side Gate Driver Output for VDDQ. |
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20 |
PHASE |
External Inductor Connection for VDDQ and it behaves as the current sense |
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comparator input for Low-Side MOSFET RDS(ON) sensing. |
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21 |
UGATE |
High-Side Gate Driver Output for VDDQ. |
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22 |
BOOT |
Boost Flying Capacitor Connection for VDDQ. |
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23 |
VLDOIN |
Power Supply for the VTT_LDO. |
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24 |
VTT |
Power Output for the VTT_LDO |
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www.richtek.com |
DS8207-07 March 2011 |
4 |
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RT8207 |
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Absolute Maximum Ratings (Note 1) |
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z Input Voltage, TON to GND ---------------------------------------------------------------------------------------------- |
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–0.3V to 32V |
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z BOOT to GND -------------------------------------------------------------------------------------------------------------- |
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–0.3V to 38V |
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z PHASE to GND |
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DC----------------------------------------------------------------------------------------------------------------------------- |
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−0.3V to 32V |
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<20ns ------------------------------------------------------------------------------------------------------------------------ |
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−8V to 38V |
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z PHASE to BOOT ---------------------------------------------------------------------------------------------------------- |
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–6V to 0.3V |
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z VDD, VDDP, CS, MODE, S3, S5, VTTSNS, VDDQ, DEM to GND -------------------------------------------- |
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–0.3V to 6V |
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z VTTREF, VTT, VLDOIN, FB, PGOOD to GND ---------------------------------------------------------------------- |
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–0.3V to 6V |
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z UGATE to PHASE |
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DC----------------------------------------------------------------------------------------------------------------------------- |
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−0.3V to 6V |
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<20ns ------------------------------------------------------------------------------------------------------------------------ |
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−5V to 7.5V |
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z LGATE to GND |
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DC----------------------------------------------------------------------------------------------------------------------------- |
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−0.3V to 6V |
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<20ns ------------------------------------------------------------------------------------------------------------------------ |
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−2.5V to 7.5V |
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z PGND, VTTGND toGND ------------------------------------------------------------------------------------------------- |
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–0.3V to 0.3V |
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z Power Dissipation, PD @ TA = 25°C |
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WQFN-24L 4x4 ----------------------------------------------------------------------------------------------------------- |
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1.923W |
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z Package Thermal Resistance (Note 2) |
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WQFN-24L 4x4, θJA ------------------------------------------------------------------------------------------------------- |
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52°C/W |
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WQFN-24L 4x4, θJC |
------------------------------------------------------------------------------------------------------ |
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7°C/W |
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z Junction Temperature ----------------------------------------------------------------------------------------------------- |
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150°C |
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z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- |
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260°C |
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z Storage Temperature Range -------------------------------------------------------------------------------------------- |
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–65°C to 150°C |
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z ESD Susceptibility |
(Note 3) |
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HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- |
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2kV |
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MM (Machine Mode) |
------------------------------------------------------------------------------------------------------ |
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200V |
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Recommended Operating Conditions (Note 4) |
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z Input Voltage, VIN ---------------------------------------------------------------------------------------------------------- |
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2.5V to 26V |
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z Control Voltage, VDDP, VDD ---------------------------------------------------------------------------------------------- |
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4.5V to 5.5V |
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z Junction Temperature Range -------------------------------------------------------------------------------------------- |
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−40°C to 125°C |
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z Ambient Temperature Range -------------------------------------------------------------------------------------------- |
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−40°C to 85°C |
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Electrical Characteristics |
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(VDDP = VDD = 5V, VIN = 15V, DEM = VDD , RTON = 1MΩ, TA = 25°C, unless otherwise specified) |
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Parameter |
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Symbol |
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Test Conditions |
Min |
Typ |
Max |
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Unit |
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PWM Controller |
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Quiescent Supply Current |
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FB forced above the regulation point, |
-- |
470 |
1000 |
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μA |
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(VDD + VDDP) |
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VS5 = 5V, VS3 = 0V |
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TON Operating Current |
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RTON = 1MΩ |
-- |
15 |
-- |
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μA |
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IVLDOIN BIAS Current |
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VS5 = VS3 = 5V, VTT = No Load |
-- |
1 |
-- |
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μA |
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IVLDOIN Standby Current |
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VS5 = 5V, VS3= 0, VTT = No Load |
-- |
0.1 |
10 |
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μA |
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To be continued |
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DS8207-07 March 2011 |
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www.richtek.com |
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5 |
RT8207
Parameter |
Symbol |
Test Conditions |
Min |
Typ |
Max |
Unit |
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VDD + VDDP |
-- |
0.1 |
10 |
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Shutdown current |
|
TON |
-- |
0.1 |
5 |
μA |
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(VS5 = VS3 = 0V) |
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S3/S5/DEM = 0V |
−1 |
0.1 |
1 |
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IVLDOIN |
-- |
0.1 |
1 |
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FB Reference Voltage |
VREF |
VDD = 4.5V to 5.5V |
0.742 |
0.75 |
0.758 |
V |
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Fixed VDDQ Output Voltage |
|
FB = GND |
-- |
1.5 |
-- |
V |
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FB = VDD |
-- |
1.8 |
-- |
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FB Input Bias Current |
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FB = 0.75V |
−1 |
0.1 |
1 |
μA |
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VDDQ Voltage Range |
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0.75 |
-- |
3.3 |
V |
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On-Time, VIN = 15V |
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RTON = 1MΩ |
267 |
334 |
401 |
ns |
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Minimum Off-Time |
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250 |
400 |
550 |
ns |
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VDDQ Input Resistance |
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-- |
100 |
-- |
kΩ |
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VDDQ Shutdown Discharge |
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VS5 = GND |
-- |
15 |
-- |
Ω |
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Resistance |
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Current Sensing |
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CS Sink Current |
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VCS > 4.5V, After UV Blank Time |
9 |
10 |
11 |
μA |
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Current Comparator Offset |
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GND − PHASE |
−15 |
-- |
15 |
mV |
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Zero Crossing Threshold |
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PHASE − GND, DEM = 5V |
−10 |
-- |
5 |
mV |
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Fault Protection |
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Current Limit (Positive) |
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GND − PHASE, RCS = 5kΩ |
35 |
50 |
65 |
mV |
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GND − PHASE, RCS = 20kΩ |
170 |
200 |
230 |
mV |
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Output UV Threshold |
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60 |
70 |
80 |
% |
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OVP Threshold |
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With respect to error comparator |
10 |
15 |
20 |
% |
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threshold |
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OV Fault Delay |
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FB forced above OV threshold |
-- |
20 |
-- |
μs |
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VDDP Under voltage Lockout |
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Rising edge, hysteresis = 20mV, |
3.9 |
4.2 |
4.5 |
V |
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Threshold |
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PWM disabled below this level |
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Current Limit Step Time at Soft Start |
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Each step |
-- |
128 |
-- |
clks |
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UV Blank Time |
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From S5 signal going high |
-- |
512 |
-- |
clks |
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Thermal Shutdown |
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Hysteresis = 10°C |
-- |
165 |
-- |
°C |
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Driver On-Resistance |
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UGATE Gate Driver (pull up) |
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(BOOT − PHASE) forced to 5V |
-- |
2 |
4 |
Ω |
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UGATE Gate Driver (sink) |
|
(BOOT − PHASE) forced to 5V |
-- |
1 |
3 |
Ω |
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LGATE Gate Driver (pull up) |
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LGATE, High State (source) |
-- |
2.5 |
6 |
Ω |
|
LGATE Gate Driver (pull down) |
|
LGATE, Low State (sink) |
-- |
0.6 |
1.5 |
Ω |
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UGATE Gate Driver Source/Sink |
|
UGATE forced to 2.5V, |
-- |
1 |
-- |
A |
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Current |
|
(BOOT − PHASE) forced to 5V |
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LGATE Gate Driver Source Current |
|
LGATE Forced to 2.5V |
-- |
1 |
-- |
A |
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LGATE Gate Driver Sink Current |
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LGATE Forced to 2.5V |
-- |
3 |
-- |
A |
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Dead Time |
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LGATE Rising (PHASE = 1.5V) |
-- |
40 |
-- |
ns |
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UGATE Rising |
-- |
40 |
-- |
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Internal boost charging switch on |
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VDDP to BOOT, 10mA |
-- |
-- |
80 |
Ω |
|
resistance |
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To be continued |
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|
www.richtek.com |
|
|
|
DS8207-07 March 2011 |
|||
6 |
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|
RT8207
Parameter |
Symbol |
|
Test Conditions |
Min |
Typ |
Max |
Unit |
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Logic I/O |
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Logic Input Low Voltage |
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S3, S5, DEM Low |
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-- |
-- |
0.8 |
V |
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Logic Input High Voltage |
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S3, S5, DEM High |
|
2 |
-- |
-- |
V |
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Logic Input Current |
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S3/S5/DEM = VDD/GND |
−1 |
0 |
1 |
μA |
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PGOOD (upper side threshold decide by OV threshold) |
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Trip Threshold (falling) |
|
Measured at FB, with respect to |
−13 |
−10 |
−7 |
% |
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reference, no load. Hysteresis = 3% |
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Fault Propagation Delay |
|
Falling edge, FB forced below |
-- |
2.5 |
-- |
μs |
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PGOOD trip threshold |
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Output Low Voltage |
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ISINK = 1mA |
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-- |
-- |
0.4 |
V |
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Leakage Current |
|
High state, forced to 5.0V |
-- |
-- |
1 |
μA |
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VTT LDO TA = 25°C, Unless Otherwise specification |
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VDDQ = VLDOIN = 1.5V/1.8V, |
−20 |
-- |
+20 |
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IVTT = 0A |
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VTT Output Tolerance |
VVTTTOL |
VDDQ = VLDOIN = 1.5V/1.8V, |
−30 |
-- |
+30 |
mV |
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IVTT = 1A |
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VDDQ = VLDOIN = 1.5V/1.8V, |
−40 |
-- |
+40 |
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IVTT = 2A, |
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VDDQ |
×0.95 , |
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VTT = |
2 |
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3 |
-- |
6 |
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VTT Source Current Limit |
IVTTOCLSRC |
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A |
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PGOOD = High |
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VTT = 0V |
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-- |
2 |
-- |
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VDDQ |
×1.05 |
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VTT = |
2 |
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3 |
-- |
6 |
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VTT Sink Current Limit |
IVTTOCLSNK |
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A |
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PGOOD = High |
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VTT = VDDQ |
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-- |
2 |
-- |
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S5 = 5V, S3 = 0V, |
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VTT Leakage Current |
IVTTLK |
|
VDDQ |
|
|
−10 |
-- |
10 |
μA |
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VTT = |
2 |
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VTTFB Leakage Current |
IVTTSNSLK |
ISINK = 1mA |
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−1 |
-- |
1 |
μA |
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VTT Discharge Current |
IDSCHRG |
VDDQ = 0V, VTT = 0.5V, |
10 |
30 |
-- |
mA |
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S5 = S3 = 0V |
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VDDQ |
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VTTREF Output Voltage |
VVTTREF |
VVTTREF = |
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|
-- |
0.9/0.75 |
-- |
V |
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2 |
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|
VLDOIN = VDDQ = 1.5V, |
−15 |
-- |
+15 |
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VDDQ/2, VTTREF Output |
|
IVTTREF < 10mA |
|
|
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VVTTREFTOL |
|
|
|
|
mV |
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Voltage Tolerance |
VLDOIN = VDDQ = 1.8V, |
−18 |
-- |
+18 |
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|
IVTTREF < 10mA |
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VTTREF Source Current |
IVTTREFOCL |
VVTTREF = 0V |
|
|
10 |
40 |
80 |
mA |
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Limit |
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|
|
DS8207-07 March 2011 |
www.richtek.com |
|
7 |