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  ON Semiconductor Electronic Components Datasheet  

CS5308 Datasheet

Two-Phase PWM Controller

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CS5308
Two−Phase PWM Controller
with Integrated Gate
Drivers for VRM 8.5
The CS5308 is a secondgeneration, twophase step down
controller that incorporates all control functions required to power
next generation processors. Proprietary multiphase architecture
guarantees balanced load current distribution and reduces overall
solution cost in high current applications. Enhanced V2control
architecture provides the fastest possible transient response, excellent
overall regulation, and ease of use. The CS5308 is a second generation
PWM controller because it optimizes transient response by combining
traditional Enhanced V2 with an internal PWM ramp and
fastfeedback directly from VCORE to the internal PWM comparator.
These enhancements provide greater design flexibility, facilitate use
and reduce output voltage jitter.
The multiphase architecture reduces input and output filter ripple,
allowing for a significant reduction in filter size and inductor values
with a corresponding increase in the output inductor current slew rate.
This approach allows a considerable reduction in input and output
capacitor requirements, as well as reducing overall solution size and
cost.
The CS5308 includes VTT monitoring and timing, VTT Power
Good (VTTPGD), Power Good (PWRGD), and internal MOSFET gate
drivers to provide a “fully integrated solution” to simplify design,
minimize circuit board area, and reduce overall system cost.
Features
Enhanced V2 Control Method
Internal PWM Ramp
FastFeedback Directly from VCORE
5Bit DAC with 1% Tolerance
Adjustable Output Voltage Positioning
200 kHz to 800 kHz Operation Set by Resistor
Current Sensed through Sense Resistors or Output Inductors
Adjustable Hiccup Mode Current Limit
Overvoltage Protection through Synchronous MOSFETs
Individual Current Limits for Each Phase
OnBoard Current Share Amplifiers
3.3 V, 1.0 mA Reference Output
VTT Monitoring and VTT Power Good (VTTPGD)
VCORE Power Good
On/Off Control (through COMP Pin)
Improved Noise Immunity
http://onsemi.com
28
1
SO28L
DW SUFFIX
CASE 751F
MARKING
DIAGRAM
28
CS5308
AWLYYWW
1
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
PIN CONNECTIONS
1
COMP
VFB
VDRP
REF
ILIM
VID25
VID0
VID1
VID2
VID3
PWRGD
CSREF
CS1
CS2
28ROSC
LGND
VCCL
VCCH1
GATE(H)1
GATE(L)1
PGND
VCCL12
GATE(L)2
GATE(H)2
VCCH2
VTTPGD
VTTCT
VTT
ORDERING INFORMATION
Device
Package
Shipping
CS5308GDW28
SO28L 27 Units/Rail
CS5308GDWR28 SO28L 1000 Tape & Reel
© Semiconductor Components Industries, LLC, 2006
July, 2006 Rev. 6
1
Publication Order Number:
CS5308/D


  ON Semiconductor Electronic Components Datasheet  

CS5308 Datasheet

Two-Phase PWM Controller

No Preview Available !

CS5308
+5.0 V
+12 V
RFBK1
6.49 k
CAMP
3.9 nF
CFBK2
470 pF
VFB
RDRP1
11.5 k
RLIM1
5.76 k
CREF
0.1 mF
RLIM2
1.0 k
SIGGND
VID25
VID0
VID1
VID2
VID3
PWRGD
L1 300 nH
RCMP1
5.62 k
R5V
1.0 W
CVCC
1.0 mF
CCMP1
3.3 nF
CCMP2
0.1 mF
SIGGND
SIGGND
ROSC
39.2 k
COMP
ROSC
VFB LGND
VDRP
VCCL
REF
VCCH1
ILIM GATE(H)1
VID25 GATE(L)1
VID0
PGND
VID1
VCCL12
VID2
GATE(L)2
VID3
GATE(H)2
PWRGD VCCH2
CSREF
VTTPGD
CS1
VTTCT
CS2 VTT
CS5308
VTT
CQ1
0.1 mF
Q1
GATE1
Q2
GATE2
CVCCH1
1.0 mF
CVCC12
1.0 mF
CVCCH2
1.0 mF
CVTT
0.1 mF
SIGGND
CQ3
0.1 mF
GATE3
Q3
Q4
GATE4
+ CINPUT
Electrolytics
VOUT
L2 825 nH
COUT
Electrolytics
CCER
Ceramics
L3 825 nH
RCSREF
20 k CSREF
CCSREF
0.01 mF
SIGGND
CS1
CS2
RCS1
100 k
CCS1
CCS2
0.01 mF 0.01 mF
RVTT
1.0 k
RCS2
100 k
SWNODE1
SWNODE2
Recommended Components:
L1: Coiltronics CTX1514771 or T3026 core with 3T of #16 AWG
L2: Coiltronics CTX2215401 X1 or T5052 with 5T of #16 AWG Bifilar
CINPUT: 2 × Sanyo Oscon 6SP680M (680 mF, 6.3 V)
COUT: 7 × Rubycon 6.3ZA1000M10x16 (1000 mF, 6.3 V)
CCERAMICS: 12 × Panasonic ECJ3YB0J106K (10 mF, 6.3 V)
Q1Q4: ON Semiconductor NTB85N03 (28 V, 85 A)
Figure 1. Application Diagram. 5.0 V to 1.7 V at 28 A, 335 kHz with 12 V Bias for Pentium) III Applications
http://onsemi.com
2


Part Number CS5308
Description Two-Phase PWM Controller
Maker ON Semiconductor
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CS5308 Datasheet PDF






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