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PDF RT8867A Data sheet ( Hoja de datos )
| Número de pieza | RT8867A | |
| Descripción | Advanced 4/3-Phase PWM Controller | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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®
RT8867A
Advanced 4/3-Phase PWM Controller for CPU Core Power
General Description
The RT8867A is an advanced 4/3-phase synchronous buck
controller with 3 integrated MOSFET drivers. It integrates
an 8-bit DAC that supports Intel VR11.x CPUs power
application.
The IC adopts state-of-the-art dynamic phase control
capability by PS1/2/3 pins and achieves high efficiency
over a wide load range. It uses lossless RDS(ON) current
sensing to achieve phase current balance. Other features
include adjustable operating frequency, adjustable soft-
start, short circuit protection, adjustable over current
protection, over voltage protection, under voltage
protection, power good indication, VR_HOT indication and
VR_SHDN indication.
The RT8867A is available in a small footprint with WQFN-
48L 6x6 package.
Ordering Information
RT8867A
Package Type
QW : WQFN-48L 6x6 (W-Type)
Note :
Lead Plating System
Z : ECO (Ecological Element with
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.
Marking Information
RT8867A
ZQW
YMDNN
RT8867AZQW : Product Number
YMDNN : Date Code
Features
z 12V Power Supply Voltage
z 4/3-Phase Power Conversion
z Integrated 3 MOSFET Drivers with Internal
Bootstrap Diode
z Dynamic Phase Control Capability
z 8-bit DAC Supports Intel VR11.x CPUs
z Lossless RDS(ON) Current Sensing for Current Balance
z Adjustable Frequency : 50kHz to 1MHz
z Adjustable Over Current Protection
z Adjustable Soft-Start
z VR_RDY, VR_HOT and VR_SHDN Indications
z Small 48-Lead WQFN Package
z RoHS Compliant and Halogen Free
Applications
z Desktop CPU Core Power
z Middle/High End Graphic Cards
z Low Voltage, High Current DC/ DC Converters
Pin Configurations
(TOP VIEW)
48 47 46 45 44 43 42 41 40 39 38 37
PS2 1
SS 2
EN 3
DAC 4
EAP 5
FB 6
COMP 7
CSP 8
CSN 9
IMAX 10
PS3/VR_SHDN 11
PS1 12
GND
49
36
35
34
33
32
31
30
29
28
27
26
25
13 14 15 16 17 18 19 20 21 22 23 24
UGATE1
PHASE1
LGATE1
VCC12A
BOOT2
UGATE2
PHASE2
LGATE2
VCC12B
LGATE3
PHASE3
UGATE3
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8867A-02 January 2013
WQFN-48L 6x6
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8867A
VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 Voltage
1 0 0 0 1 1 1 0 0.72500
1 0 0 0 1 1 1 1 0.71875
1 0 0 1 0 0 0 0 0.71250
1 0 0 1 0 0 0 1 0.70625
1 0 0 1 0 0 1 0 0.70000
1 0 0 1 0 0 1 1 0.69375
1 0 0 1 0 1 0 0 0.68750
1 0 0 1 0 1 0 1 0.68125
1 0 0 1 0 1 1 0 0.67500
1 0 0 1 0 1 1 1 0.66875
1 0 0 1 1 0 0 0 0.66250
1 0 0 1 1 0 0 1 0.65625
1 0 0 1 1 0 1 0 0.65000
1 0 0 1 1 0 1 1 0.64375
1 0 0 1 1 1 0 0 0.63750
1 0 0 1 1 1 0 1 0.63125
1 0 0 1 1 1 1 0 0.62500
1 0 0 1 1 1 1 1 0.61875
1 0 1 0 0 0 0 0 0.61250
1 0 1 0 0 0 0 1 0.60625
1 0 1 0 0 0 1 0 0.60000
1 0 1 0 0 0 1 1 0.59375
1 0 1 0 0 1 0 0 0.58750
1 0 1 0 0 1 0 1 0.58125
1 0 1 0 0 1 1 0 0.57500
1 0 1 0 0 1 1 1 0.56875
1 0 1 0 1 0 0 0 0.56250
1 0 1 0 1 0 0 1 0.55625
1 0 1 0 1 0 1 0 0.55000
1 0 1 0 1 0 1 1 0.54375
1 0 1 0 1 1 0 0 0.53750
1 0 1 0 1 1 0 1 0.53125
1 0 1 0 1 1 1 0 0.52500
1 0 1 0 1 1 1 1 0.51875
1 0 1 1 0 0 0 0 0.51250
1 0 1 1 0 0 0 1 0.50625
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8867A-02 January 2013
VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 Voltage
1 0 1 1 0 0 1 0 0.50000
1 1 1 1 1 1 1 0 OFF
1 1 1 1 1 1 1 1 OFF
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT8867A
Parameter
Protection
Total Current Protection
Threshold
Over Voltage Threshold
Under Voltage Threshold
Over Temperature
Protection Threshold
Over Temperature
Protection Hysteresis
Output Pin Capability
VR_HOT Sinking
Capability
VR_RDY Sinking
Capability
Symbol
Test Conditions
VIMAX
VOVP
VUVP
VFB − VEAP
VFB − VEAP
(Note 5)
VVR_HOT IVR_HOT = 4mA
VVR_RDY IVR_RDY = 4mA
Min Typ Max Unit
1.1 1.2 1.3
350 390 430
−380 −300 −250
145 150 175
-- 20 --
V
mV
mV
°C
°C
-- 0.05 0.2
-- 0.05 0.2
V
V
VR_SHDN Sinking
Capability
VVR_SHDN IVR_SHDN = 4mA
PS1/PS2 Sourcing Current IPS1, IPS2
-- 0.05 0.2
9.2 10 10.8
V
μA
Reduce Operating Phase VPS1_hys 2 Phase Operating Reduce to 1 Phase -- 30 -- %VPS1
Number Threshold
Hysteresis
VPS2_hys 3 Phase Operating Reduce to 2 Phase -- 20 -- %VPS2
VPS3_hys 4 Phase Operating Reduce to 3 Phase -- 15 -- % VPS3/5
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. Guaranteed by Design.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8867A-02 January 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet RT8867A.PDF ] | |
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