CS5308
Two−Phase PWM Controller
with Integrated Gate
Drivers for VRM 8.5
The CS5308 is a second−generation, two−phase step down
controller that incorporates all control functions required to power
next generation processors. Proprietary multi−phase architecture
guarantees balanced load current distribution and reduces overall
http://onsemi.com
MARKING
2
solution cost in high current applications. Enhanced V ™ control
DIAGRAM
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
28
28
1
CS5308
2
traditional Enhanced V with an internal PWM ramp and
AWLYYWW
SO−28L
DW SUFFIX
CASE 751F
fast−feedback directly from V
to the internal PWM comparator.
CORE
These enhancements provide greater design flexibility, facilitate use
and reduce output voltage jitter.
1
The multi−phase 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.
A
= Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
PIN CONNECTIONS
The CS5308 includes VTT monitoring and timing, VTT Power
1
28
Good (VTT ), Power Good (PWRGD), and internal MOSFET gate
PGD
COMP
R
OSC
drivers to provide a “fully integrated solution” to simplify design,
minimize circuit board area, and reduce overall system cost.
V
LGND
FB
V
V
V
DRP
REF
CCL
CCH1
I
GATE(H)1
GATE(L)1
PGND
LIM
Features
• Enhanced V Control Method
• Internal PWM Ramp
• Fast−Feedback Directly from V
V
ID25
V
V
V
V
2
ID0
ID1
ID2
ID3
V
CCL12
GATE(L)2
GATE(H)2
CORE
PWRGD
CS
V
• 5−Bit DAC with 1% Tolerance
CCH2
VTT
VTT
VTT
REF
PGD
CT
• 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
• On−Board Current Share Amplifiers
CS1
CS2
ORDERING INFORMATION
Device
Package
Shipping
27 Units/Rail
CS5308GDW28
SO−28L
• 3.3 V, 1.0 mA Reference Output
CS5308GDWR28
SO−28L 1000 Tape & Reel
• VTT Monitoring and VTT Power Good (VTT
)
PGD
• V
Power Good
CORE
• On/Off Control (through COMP Pin)
• Improved Noise Immunity
©
Semiconductor Components Industries, LLC, 2006
1
Publication Order Number:
July, 2006 − Rev. 6
CS5308/D