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SI9140CY Datasheet(PDF) 1 Page - Vishay Siliconix

No. de pieza SI9140CY
Descripción Electrónicos  MP Controller For High Performance Process Power Supplies
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Fabricante Electrónico  VISHAY [Vishay Siliconix]
Página de inicio  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SI9140CY Datasheet(HTML) 1 Page - Vishay Siliconix

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Si9140
Vishay Siliconix
Document Number: 70026
S-40699—Rev. H, 19-Apr-04
www.vishay.com
1
MP Controller For High Performance Process Power Supplies
FEATURES
D Runs on 3.3- or 5-V Supplies
D Adjustable, High Precision Output
Voltage
D High Frequency Operation (>1 MHz)
D High Efficiency Synchronous
Switching
D Full Set of Protection Circuitry
D 2000-V ESD Rating (Si9140CQ/DQ)
DESCRIPTION
Siliconix’ Si9140 Buck converter IC is a high-performance,
surface-mount switchmode controller made to power the new
generation
of
low-voltage,
high-performance
micro-
processors. The Si9140 has an input voltage range of 3 to
6.5 V to simplify power supply designs in desktop PCs. Its
high-frequency switching capability and wide bandwidth
feedback loop provide tight, absolute static and transient load
regulation. Circuits using the Si9140 can be implemented with
low-profile, inexpensive inductors, and will dramatically
minimize power supply output and processor decoupling
capacitance. The Si9140 is designed to meet the stringent
regulation requirements of new and future high-frequency
microprocessors, while improving the overall efficiency in new
“green” systems.
Today’s state-of-the-art microprocessors run at frequencies
over 100 MHz. Processor clock speeds are going up and so
are current requirements, but operating voltages are going
down. These simultaneous changes have made dedicated,
high-frequency, point-of-use buck converters an essential part
of any system design. These point-of-use converters must
operate at higher frequencies and provide wider feedback
bandwidths than existing converters, which typically operate
at less than 250 kHz and have feedback bandwidths of less
than 50 kHz. The Si9140’s 100-kHz feedback loop bandwidth
ensures a minimum improvement of one-half the required
output/decoupling capacitance, resulting in a tremendous
reduction in board size and cost of implementation.
With the microprocessing power of any PC representing an
investment of hundreds of dollars, designers need to ensure
that the reliable operation of the processor will not be affected
by the power supply. The Si9140 provides this assurance. A
demo board, the Si9140DB, is available.
Si9140CQ-T1 and Si9140DQ-T1 are available in lead free.
APPLICATION CIRCUIT
COSC
R6
13
U1
Si9140
14
15
16
2
3
4
1
10
11
12
5
6
7
9
8
C7
R5
DR
VDD
VS
VGOOD
DS
COMP
UVLOSET
FB
NI
VREF
ENABLE
GND
ROSC
C6
C5
C4
C9
R9
R8
R7
C3
+
C2
PGND
MON
C8
2 x Si4435DY
2 x Si4410DY
R3
Power-Good
R2
R1
R4
C1
VIN
VCCP
+
R12
0.1%
C10
R11
R10
0.1%
R13
L1
D1
VOUT
COSC


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