End of Life. Last Available Purchase Date is 31-Dec-2014
Si9140
Vishay Siliconix
MP Controller For High Performance Process Power Supplies
FEATURES
Runs on 3.3- or 5-V Supplies
Adjustable, High Precision Output
Voltage
High Frequency Operation (>1 MHz)
High Efficiency Synchronous
Switching
Full Set of Protection Circuitry
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.
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.
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
APPLICATION CIRCUIT
V
IN
+
C1
R1
R2
V
CCP
R3
C3
2 x Si4435DY
L1
V
OUT
D1
C2
+
2 x Si4410DY
R4
Power-Good
C4
Si9140
1
2
R5
3
4
V
DD
MON
V
GOOD
V
S
DR
16
15
14
R13
C8
R7
U1
C5
R6
C6
C7
D
S
13
PGND
COMP
5
12
UVLO
SET
FB
6
11
C
OSC
NI
7
10
R
OSC
V
REF
9
8
ENABLE
GND
C9
R9
R8
R10
0.1%
R12
0.1%
C10
R11
Document Number: 70026
S-40699—Rev. H, 19-Apr-04
www.vishay.com
1
Si9140
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND.
V
DD
, V
S
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 V
P
GND
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
"0.3
V
V
DD
to V
S
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−0.3
V
Linear Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−0.3
V to V
DD
+0.3 V
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−0.3
V to V
DD
+0.3 V
Peak Output Drive Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350 mA
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−65
to 150_C
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150_C
Power Dissipation (Package)a
16-Pin SOIC (Y Suffix)
\b
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 mW
16-Pin TSSOP (Q Suffix)
c
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 925 mW
Operating Temperature
C Suffix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0_ to 70_C
D Suffix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−40_
to 85_C
Notes
a. Device mounted with all leads soldered or welded to PC board.
b. Derate 7.2 mW/_C above 25_C.
c. Derate 7.4 mW/_C above 25_C.
Thermal Impedance (
Q
JA
)
16-Pin SOIC (Y Suffix) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140_C/W
16-Pin TSSOP (Q Suffix) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135_C/W
* . Exposure to Absolute Maximum rating conditions for extended periods may affect device reliability. Stresses above Absolute Maximum rating may cause permanent
damage. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any
one time
RECOMMENDED OPERATING RANGE
Voltages Referenced to GND.
V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 V to 6.5 V
V
S
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 V to 6.5 V
f
OSC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 kHz to 2 MHz
R
OSC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 kW to 250 kW
C
OSC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 pF to 200 pF
Linear Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to V
DD
Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to V
DD
V
REF
Load Resistance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
>150 kW
SPECIFICATIONS
Test Conditions
Unless Otherwise Specified
a
Parameter
Reference
Output Voltage
V
REF
I
REF
=
−10
mA
T
A
= 25_C
1.455
1.477
1.50
1.545
1.523
V
Limits
C Suffix 0 to 70_C
D Suffix
−40
to 85_C
Symbol
3 V
v
V
DD
v
6.5 V, V
DD
= V
S
GND = P
GND
Min
b
Typ
Max
b
Unit
Oscillator
Maximum Frequency
c
Accuracy
R
OSC
Voltage
Voltage Stability
c
Temperature Stability
c
f
MAX
f
OSC
V
ROSC
Df/f
4 V
v
V
DD
v
6 V, Ref to 5 V, T
A
= 25_C
Referenced to 25_C
−8
"5
V
DD
= 5 V, C
OSC
= 47 pF, R
OSC
= 5.0 kW
V
DD
= 5 V
C
OSC
= 100 pF, R
OSC
= 7.50 kW, T
A
= 25_C
2.0
0.85
1.0
1.0
8
1.15
MHz
V
%
Error Amplifier (C
OSC
= GND, OSC DISABLED)
Input Bias Current
Open Loop Voltage Gain
Offset Voltage
Unity Gain
Bandwidth
c
I
FB
A
VOL
V
OS
BW
I
EA
P
SRR
Source (V
FB
= 1 V, NI = V
REF
)
Sink (V
FB
= 2 V, NI = V
REF
)
3 V < V
DD
< 6.5 V
0.4
V
NI
= V
REF
V
NI
= V
REF
, V
FB
= 1.0 V
−1.0
47
−15
55
0
10
−2.0
0.8
60
−1.0
15
1.0
mA
dB
mV
MHz
mA
dB
Output Current
Power Supply Rejection
c
UVLO
SET
Voltage Monitor
Under Voltage Lockout
Hysteresis
www.vishay.com
V
UVLOHL
V
UVLOLH
V
HYS
UVLO
SET
High to Low
UVLO
SET
Low to High
V
UVLOLH
−
V
UVLOHL
0.85
1.0
1.2
175
1.15
V
mV
Document Number: 70026
S-40699—Rev. H, 19-Apr-04
2
Si9140
Vishay Siliconix
SPECIFICATIONS
Test Conditions
Unless Otherwise Specified
a
Parameter
UVLO
SET
Voltage Monitor
UVLO Input Current
I
UVLO(SET)
V
UVLO
= 0 to V
DD
−100
100
nA
Limits
C Suffix 0 to 70_C
D Suffix
−40
to 85_C
Symbol
3 V
v
V
DD
v
6.5 V, V
DD
= V
S
GND = P
GND
Min
b
Typ
Max
b
Unit
Output Drive (D
R
and D
S
)
Output High Voltage
Output Low Voltage
Peak Output Current
Peak Output Current
Break-Before-Make
V
OH
V
OL
I
SOURCE
I
SINK
t
BBM
V
S
= V
DD
= 5 V, I
OUT
=
−10
mA
V
S
= V
DD
= 5 V, I
OUT
= 10 mA
V
S
= V
DD
= 5 V, V
OUT
= 0 V
V
S
= V
DD
= 5 V, V
OUT
= 5 V
V
DD
= 6.5 V
200
4.7
4.8
0.2
−380
300
40
0.3
−260
V
mA
nS
Logic
ENABLE Turn-On Delay
ENABLE Logic Low
ENABLE Logic High
ENABLE Input Current
t
dEN
V
ENL
V
ENH
I
EN
ENABLE = 0 to V
DD
0.8 V
DD
−1.0
1.0
ENABLE Delay to Output, EN
LH
, V
DD
= 5 V
1.5
0.2 V
DD
ms
V
mA
V
GOOD
Comparator (Voltage-Good Comparator)
Input Offset Voltage
Input Hysteresis
Input Bias Current
Output Sink I
Output Low Voltage
V
OS
V
INHYS
I
BMON
I
SINK
V
OL
V
IN
Common Mode Voltage = V
REF
, V
DD
= 5 V
V
IN
= V
REF
, V
DD
= 5 V
V
OUT
= 5 V, V
DD
= 5 V
I
OUT
= 2 mA, V
DD
= 5 V
−45
−1
6
0
10
0
9
350
500
1
45
mV
mA
mA
mV
Supply
Supply Current—Normal Mode
Supply Current—Standby Mode
I
DD
f
OSC
= 1 MHz, R
OSC
= 7.50 kW
ENABLE < 0.4 V
1.6
250
2.3
330
mA
mA
Notes
a. 100 pF includes C
STRAY
on C
OSC
.
b. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet.
c. Guaranteed by design, not subject to production testing.
TYPICAL CHARACTERISTICS (25_C UNLESS OTHERWISE NOTED)
1.515
V
REF
vs. Supply Voltage
V
REF
with 10
mA
Load
1.510
1.505
1.500
V
REF
(V)
V
DD
= 3 V
1.495
1.490
1.485
1.480
−50
V
REF
vs. Temperature
1.510
1.505
V
REF
(V)
V
DD
= 6 V
1.500
1.495
1.490
1.485
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
−25
0
25
50
75
100
125
V
DD
−
Supply Voltage (V)
Document Number: 70026
S-40699—Rev. H, 19-Apr-04
t
−
Temperature (_C)
www.vishay.com
3
Si9140
Vishay Siliconix
TYPICAL CHARACTERISTICS (25_C UNLESS OTHERWISE NOTED)
1.515
1.510
1.505
V
REF
(V)
1.500
1.495
1.490
1.485
0
5
10
15
20
25
30
V
REF
−
Sourcing Current (mA)
6.5 V
5.0 V
Gain (dB)
3.0, 3.6 V
V
REF
vs. Load Current
80
60
Error Amplifier Gain and Phase
0
Gain
−30
Phase (deg)
Phase
−60
−90
−120
40
20
0
−20
−40
0.0001
0.001
0.01
0.1
1
f
−
Frequency (MHz)
10
100
−150
Supply Current
vs. Supply Voltage and Temperature
1.8
C
L
= 10 pF
f = 1 MHz
70_C
Standby Current (
m
A)
240
260
Standby Current
vs. Supply Voltage and Temperature
70_C
T
A
= 85_C
250
25_C
0_C
230
−40_C
220
1.6
Normal Current (mA)
1.4
T
A
= 85_C
25_C
1.2
−40_C
1.0
3.0
0_C
3.5
4.0
4.5
5.0
5.5
6.0
6.5
210
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
V
DD
−
Supply Voltage (V)
V
DD
−
Supply Voltage (V)
600
DR Sourcing Current vs. Supply Voltage
600
DR Sinking Current vs. Supply Voltage
500
DR Sourcing Current (mA)
DR Sinking Current (mA)
3.5
4.0
4.5
5.0
5.5
6.0
6.5
500
400
400
300
300
200
200
100
3.0
100
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
V
DD
−
Supply Voltage (V)
V
DD
−
Supply Voltage (V)
www.vishay.com
4
Document Number: 70026
S-40699—Rev. H, 19-Apr-04
Si9140
Vishay Siliconix
TYPICAL CHARACTERISTICS (25_C UNLESS OTHERWISE NOTED)
600
DS Sourcing vs. Supply Voltage
600
DS Sinking Current vs. Supply Voltage
500
DS Sourcing Current (mA)
DS Sinking Current (mA)
3.5
4.0
4.5
5.0
5.5
6.0
6.5
500
400
400
300
300
200
200
100
3.0
100
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
V
DD
−
Supply Voltage (V)
V
DD
−
Supply Voltage (V)
1.2
Switching Frequency vs. Supply Voltage
R
OSC
= 7.50 kW
C
OSC
= 100 pF
10.00
Frequency vs. R
OSC
/C
OSC
Switching Frequency (MHz)
Switching Frequency (MHz)
1.1
1.00
4.99 kW
12.1 kW
24.9 kW
1.0
0.10
49.9 kW
100 kW
249 kW
0.9
0.8
3.0
0.01
3.5
4.0
4.5
5.0
5.5
6.0
6.5
40
C
OSC
−
Capacitance (pF)
200
300
V
DD
−
Supply Voltage (V)
Enable Turn-OFF Delay to Output
70
215
UVLO Hysteresis vs. Supply Voltage
60
UVLO Hysteresis (mV)
3.5
4.0
4.5
5.0
5.5
6.0
6.5
Output Delay (nS)
195
50
175
40
155
30
135
20
3.0
115
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
V
DD
−
Supply Voltage (V)
V
DD
−
Supply Voltage (V)
Document Number: 70026
S-40699—Rev. H, 19-Apr-04
www.vishay.com
5
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