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PDF RT9245A Data sheet ( Hoja de datos )
| Número de pieza | RT9245A | |
| Descripción | Multi-Phase PWM Controller | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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RT9245A
Multi-Phase PWM Controller for CPU Core Power Supply
General Description
RT9245A is a multi-phase buck DC/DC controller
integrated with all control functions for AMD K8 CPU or
Intel® GHz CPU which is VRD10.x-compliant. The
RT9245A could be operated with 2, 3 or 4 buck switching
stages operating in interleaved phase set automatically.
The multiphase architecture provides high output current
while maintaining low power dissipation on power devices
and low stress on input and output capacitors. The high
equivalent operating frequency also reduces the
component dimension and the output voltage ripple in load
transient.
RT9245A implements both voltage and current loops to
achieve good regulation, response and power stage
thermal balance.
RT9245A applies the DCR sensing technology newly. The
RT9245A extracts the DCR of output inductor as sense
component to deliver a precise load line regulation and
good thermal balance for next generation processor
application.
Current sense setting, droop tuning, VCORE initial offset
and over current protection are independent on
compensation circuit of voltage loop. The feature greatly
facilitates the flexibility of CPU power supply design and
tuning. The DAC output of RT9245A supports AMD K8
5-bit VID and Intel® VRD10.x with 6-bit VID input, precise
offset value & smooth VCORE transient at VID jump. The
IC monitors the VCORE voltage for PGOOD and over-voltage
protection. Soft-start, over-current protection and
programmable under-voltage lockout are also provided to
assure the safety of microprocessor and power system.
The RT9245A comes to a small footprint package
TSSOP-28.
Ordering Information
RT9245A
Package Type
C : TSSOP-28
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
DS9245A-05 March 2007
Features
z Multi-Phase Power Conversion with Automatic
Phase Selection
z 6-bits VRD10.x or 5-bit K8 DAC Output with Active
Droop Compensation for Fast Load Transient
z Smooth VCORE Transition at VID Jump
z Power Stage Thermal Balance by DCR Current
Sense
z Hiccup Mode Over-Current Protection
z Programmable Switching Frequency (50kHz to
400kHz per Phase), Under-Voltage Lockout and Soft-
Start
z High Ripple Frequency Times Channel Number
z 28-TSSOP Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Intel® Processors Voltage Regulator : VRD10.x and AMD
K8
z Low Output Voltage, High Current DC-DC Converters
z Voltage Regulator Modules
Pin Configurations
(TOP VIEW)
VID4
VID3
VID2
VID1
VID0
VID125/VIDSEL
SGND
FB
COMP
PGOOD
DVD
SS
RT
VOSS
2
3
4
5
6
7
8
9
10
11
12
13
14
28 VCC
27 PWM1
26 PWM2
25 PWM3
24 PWM4
23 CSP4
22 CSP2
21 CSP3
20 CSP1
19 GND
18 ADJ
17 IOUT
16 CSN
15 IMAX
TSSOP-28
Note :
RichTek Pb-free and Green 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.
`100% matte tin (Sn) plating.
www.richtek.com
1
1 page  
Function Block Diagram
RT9245A
DS9245A-05 March 2007
www.richtek.com
5
5 Page 
Typical Operating Characteristics
Adjustable Frequency
700
600
500
400
300
200
100
0
0 10 20 30 40 50 60 70
RRT (kWΩ)
PWM
Relationship Between Inductor
Current and VADJ
CH1:(5V/Div)
CH2:(5V/Div)
VSS
VADJ
IL CH3:(50mV/Div)
CH4:(20A/Div)
Time (25ms/Div)
VSS
PWM
Power-On @ IOUT = 60A
CH1:(5V/Div)
CH2:(5V/Div)
UGATE
LGATE
CH3:(20V/Div)
CH4:(10V/Div)
Time (10ms/Div)
RT9245A
70 RRT = 16kΩ
60
PWM vs. VCOMP
50
40
30
20
10
0
0.5 1 1.5 2 2.5 3 3.5
VCOMP (V)
Power-Off @ IOUT = 60A
PWM
UGATE
LGATE
VCOMP
CH1:(5V/Div)
CH2:(20V/Div)
CH3:(10V/Div)
CH4:(1V/Div)
Time (10μs/Div)
Ripple
VCORE
(5mV/Div)
L = 0.3μH, C = 5600μF
Time (2.5μs/Div)
DS9245A-05 March 2007
www.richtek.com
11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet RT9245A.PDF ] | |
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