Si9140
Vishay Siliconix
SMP 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.
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.
APPLICATION CIRCUIT
FaxBack 408-970-5600, request 70026
www.siliconix.com
S-58034—Rev. G, 15-Mar-99
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)
16-Pin SOIC (Y Suffix)
b
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 mW
16-Pin TSSOP (Q Suffix)
c
. . . . . . . . . . . . . . . . . . . . . . . . . . . 925 mW
* 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.
a
Thermal Impedance (Θ
JA
)
16-Pin SOIC (Y Suffix) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140°C/W
16-Pin TSSOP (Q Suffix). . . . . . . . . . . . . . . . . . . . . . . . . . . . 135°C/W
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.
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 kΩ to 250 kΩ
C
OSC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 pF to 200 pF
Linear Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to V
DD
Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to V
DD
V
REF
Load Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >150 kΩ
SPECIFICATIONS
Limits
Test Conditions
Unless Otherwise Specified
a
Parameter
Reference
Output Voltage
V
REF
I
REF
= -10
µA
T
A
= 25°C
1.455
1.477
1.50
1.545
1.523
V
C Suffix 0 to 70°C
D Suffix -40 to 85°C
3 V
≤
V
DD
≤
6.5 V, V
DD
= V
S
GND = P
GND
Symbol
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
∆f/f
V
DD
= 5 V, C
OSC
= 47 pF, R
OSC
= 5.0 kΩ
V
DD
= 5 V
C
OSC
= 100 pF, R
OSC
= 7.50 kΩ, T
A
= 25°C
4 V
≤
V
DD
≤
6 V, Ref to 5 V, T
A
= 25°C
Referenced to 25°C
2.0
0.85
1.0
1.0
-8
±5
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
Output Current
Power Supply Rejection
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
µA
dB
mV
MHz
mA
dB
S-58034—Rev. G, 15-Mar-99
2
FaxBack 408-970-5600, request 70026
www.siliconix.com
Si9140
Vishay Siliconix
SPECIFICATIONS
Limits
Test Conditions
Unless Otherwise Specified
a
Parameter
UVLO
SET
Voltage Monitor
Under Voltage Lockout
Hysteresis
UVLO Input Current
V
UVLOHL
V
UVLOLH
V
HYS
I
UVLO(SET)
UVLO
SET
High to Low
UVLO
SET
Low to High
V
UVLOLH -
V
UVLOHL
V
UVLO
= 0 to V
DD
-100
0.85
1.0
1.2
175
100
1.15
V
mV
nA
C Suffix 0 to 70°C
D Suffix -40 to 85°C
3 V
≤
V
DD
≤
6.5 V, V
DD
= V
S
GND = P
GND
Symbol
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
µs
V
µA
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
0
10
-1
6
0
9
350
500
1
45
mV
µA
mA
mV
Supply
Supply Current-Normal Mode
Supply Current-Standby Mode
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.
I
DD
f
OSC
= 1 MHz, R
OSC
= 7.50 kΩ
ENABLE < 0.4 V
1.6
250
2.3
330
mA
µA
FaxBack 408-970-5600, request 70026
www.siliconix.com
S-58034—Rev. G, 15-Mar-99
3
Si9140
Vishay Siliconix
TYPICAL CHARACTERISTICS (25°C UNLESS OTHERWISE NOTED)
S-58034—Rev. G, 15-Mar-99
4
FaxBack 408-970-5600, request 70026
www.siliconix.com
Si9140
Vishay Siliconix
TYPICAL CHARACTERISTICS (25°C UNLESS OTHERWISE NOTED)
FaxBack 408-970-5600, request 70026
www.siliconix.com
S-58034—Rev. G, 15-Mar-99
5
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