SI9168DB

Si9168DB
Vishay Siliconix
Si9168 Demonstration Board
Voltage Mode Control
5-V to 10-V Input Voltage Range for VDD
5-V to 12.6-V Input Voltage Range for VS–Boost
Programmable PWM/PSM Control
Up to 2-MHz Switching Frequency in PWM
Synchronous Rectification in PWM
Less Than 350-A IDD in PSM
Very High Efficiencies in Buck or Boost Modes
Low Dropout Operation at 100% Duty Cycle In Buck Mode
Integrated Soft-Start
Logic Controlled Micro Power Shutdown Current <2 A
Fast Line and Load Transient Response
Available in 16-Lead TSSOP Package
2-Cell Li+ or 6-Cell NiCd / NiMH Operation
Si9168DB-K1—VIN = 5 to 10 V, VOUT = 3.6-V/1.5-A Buck
Si9168DB-K2—VIN = 5 to 10 V, VOUT = 3.6-V/2.5-A Buck
Si9168DB-S1—VIN = 5 to 7.2 V, VOUT = 7.2-V/2.5-A Boost
The Si9168 is a high-frequency synchronous dc-to-dc
controller designed for higher-power buck or boost conversion
applications in end products running off 2-cell Lithium Ion or
6-cell NiCd or NiMH battery packs. Like the lower-power
Si9167, the Si9168 is capable of operating at up to 2 MHz with
a variety of drivers. Its high-frequency operation, strong totem
pole drivers, selectable PWM/PSM operation modes,
integrated under-voltage lockout, and soft-start features make
the Si9168 suitable for 1-A to 10-A conversion applications,
where size and cost are at prime importance.
To fully demonstrate the capability or the product, he Si9168
demonstration boards are available in three different versions.
The buck converters provide 3.6-V nominal outputs and the
boost converter output voltage is set at 7.2 V. The input source
can be a 2-cell Li+, 6-cell NiCd/NiMH battery pack or dc supply.
The set frequency in PWM for both buck and boost converter
is 850-kHz nominal to optimize the efficiency performance.
Higher or lower frequency can be programmed by using ROSC
(R5) or synchronized with external clock. The demo boards
can be easily modified to obtain the optimum efficiency at the
rated load condition, by choosing the right MOSFET in
respective packages.
The demonstration boards use all surface mount components
and are fully assembled and tested for quick evaluation.
Jumpers, test points and terminals are provided for the easy
selection of operating mode and to observe waveform and
inserting the error signal for the closed loop response.
Included in this document are the Bill-Of-Materials,
Schematics, PCB Layout of the Demo Boards and actual
waveforms/graphs.
The demonstration board layout is available in Gerber file format. Please contact your Vishay Siliconix sales representative or
distributor for a copy.
Document Number: 71159
16-Feb-00
Si9168DB-K1—IOUT 1.5 A – Buck
Si9168DB-K2—IOUT 2.5 A – Buck
Si9168DB-S1—IOUT 2.5 A – Boost
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Si9168DB
Vishay Siliconix
POWER UP CHECK LIST AND OPERATION
Follow these steps to verify the converter operation.
oscilloscope ground to the input ground and the probe at
coil/MOSFET drain to observe the switching waveform.
1
Visually inspect the PCB to be sure that all the components
are intact and no foreign substance is lying on it.
6
2
Reduce the source voltage to zero and connect it through
the dc ammeter at P1 and P2 with positive at P1 and
ground at P2.
Slowly increase the input voltage while monitoring the
output voltage and coil waveform. Set the input voltage to
5.4 V and increase the load slowly up to its full rated load.
7
To test the demo board in PSM, adjust the load to 50 mA.
Then change the jumper JP1 setting to PSM. Notice the
reduction of the input current.
8
When using the external power source with long lead wires
and current meter, it is advised to connect 1000-mF/25-V
capacitor to reduce the effect of lead impedance,
especially while measuring the closed loop response,
dynamic load response or output Rise/Fall at the turn on.
3
Position the jumper JP1 to ENABLE and JP2 to PWM.
4
Connect the load through the dc ammeter at P3 and P4,
with positive at P3 and ground at P4. Keep the load at
200 mA.
5
Connect the voltmeters exactly at P1, P2 for input voltage
and P3, P4 for output voltage measurement. Connect the
APPLICATION SCHEMATIC AND PCB LAYOUTĊSI9168DBĆK1
VIN
P1
JP2: –SD to VIN for converter enable mode;
–SD to PGND for shutdown mode.
1
P2
C1
22 mF
16 V
* = Optional
R1*
51 W
6, 7
R9*
5.6 W
1
5
PGND
R8*
5.6 W
U1
JP1
1
2 PWM
-PSM
3
JP2
1
1
2
2 Enable
Disable
3
MODE
VS
DL
NC
3 PGND
D
4
H
5
6
SD PWM/PSM
VOUT
SYNC
VDD
GND
7 R
OSC
R6
C5
0.1 mF
R5
75 kW
VREF
8 COMP
8.2 kW
FB
Si9168
C6
1000 pF
8
1
16
15
C9
0.1 mF
4
14
Q1A
13
Q1B
Si6803DQ
P3
VOUT
1
C2
10 mF
10 V
C3
0.1 mF
3.6 V
1.5 A
P4
2, 3
1
Si6803DQ
PGND
R7*
51 W
12
11
P5
10
9
1
C8
0.1 mF
C7
56 pF
TP1
R2
200 W
R3
22 kW
C4
330 pF
SYNC
R4
12.4 kW
1
FIGURE 1.
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2
VOUT
L1, 4.7 mH
IHLP2525
D1
B130LB
or
MBR0520T1
VIN
5-10 V
JP1: PWM/–PSM to VIN for PWM mode;
PWM/–PSM to PGND for PSM mode.
Si9168DB-K1, 3.6-VOUT/1.5-A Buck Regulator
Document Number: 71159
16-Feb-00
Si9168DB
Vishay Siliconix
FIGURE 2.
FIGURE 3.
FIGURE 4.
Document Number: 71159
16-Feb-00
Si9168DB-K1 , Silk Screen
Si9168DB-K1, Top Layer
Si9168DB-K1, Bottom Layer
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Si9168DB
Vishay Siliconix
APPLICATION SCHEMATIC AND PCB LAYOUTĊSI9168DBĆK2
VIN
P1
1
VIN
5-10 V
P2
C1
22 mF
16 V
R1*
51 W
3
R9*
2.7 W
1
4
PGND
JP1
1
2 PWM
-PSM
3
JP2
1
1
2
2 Enable
Disable
3
MODE
VS
DL
NC
3 PGND
D
4
H
5
6
SD PWM/PSM
VOUT
SYNC
VDD
GND
7 R
OSC
R6
C5
0.1 mF
R5
75 kW
8 COMP
8.2 kW
C6
1000 pF
VREF
FB
Si9168BQ
7, 8
15
2
C2
22 mF
10 V
C3
0.1 mF
3.6 V
2.5 A
P4
14
Q1A
13
P3
VOUT
1
5, 6
16
C9
0.1 mF
VOUT
L1, 1.5 mH
IHLP2525
D1
B130LB
R8*
2.7 W
U1
Q1B
Si9801DY
1
1
Si9801DY
PGND
R7*
51 W
12
11
P5
10
9
1
C8
0.1 mF
C7
56 pF
TP1
R2
200 W
R3
22 kW
C4
330 pF
SYNC
R4
12.4 kW
1
JP1: PWM/PSM to VIN for PWM mode;
PWM/PSM to GND for PSM mode.
JP2: SD to VIN for converter enable mode;
SD to GND for shutdown mode.
* = Optional
FIGURE 5.
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Si9168DB-K2, 3.6-VOUT/2.5-A Buck Regulator
Document Number: 71159
16-Feb-00
Si9168DB
Vishay Siliconix
FIGURE 6.
FIGURE 7.
FIGURE 8.
Document Number: 71159
16-Feb-00
Si9168DB-K2, Silk Screen
Si9168DB-K2, Top Layer
Si9168DB-K2, Bottom Layer
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Si9168DB
Vishay Siliconix
APPLICATION SCHEMATIC AND PCB LAYOUTĊSI9168DBĆS1
VIN
L1, 1.5 mH
IHLP2525
P1
1
VIN
5-7.2 V
P2
Q2
R1*
51 W
C1
10 mF
16 V
Si3442DV
Q1
PGND
4
D1
B130LB
JP1
1
4
2 PWM
3
-PSM
1
2
2 Enable
1, 2, 3
U1
1
3
5, 6, 7, 8
SI9803DY
3
1
JP2
1, 2, 5, 6
MODE
VS
NC
DL
3 PGND
Disable
4
5
6
SD
DH
PWM/PSM
VOUT
SYNC
VDD
GND
7 R
OSC
R6
C5
0.1 mF
R5
75 kW
8 COMP
4.7 kW
C6
0.0056 mF
VREF
FB
VOUT
16
P3
VOUT
1
15
C2
47 mF
16 V
14
C3
0.1 mF
7.2 V
2.5 A
13
P4
12
1
PGND
11
R7*
51 W
10
9
P5
C8
0.1 mF
1
Si9168
R2
1 kW
C7
220 pF
R3
56.2 kW
C4
560 pF
SYNC
1
PWM/PSM to VIN for PWM mode;
PWM/PSM to GND for PSM mode.
R4
12.4 kW
SD to VIN for converter enable mode;
SD to GND for shutdown mode.
* = Optional
FIGURE 9.
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6
Si9168DB-S1, 7.2-VOUT/2.5-A Boost Regulator
Document Number: 71159
16-Feb-00
Si9168DB
Vishay Siliconix
FIGURE 10. Si9168DB-S1 , Silk Screen
FIGURE 11.
Si9168DB-S1 , Top Layer
FIGURE 12. Si9168DB-S1 , Bottom Layer
Document Number: 71159
16-Feb-00
www.siliconix.com FaxBack 408-970-5600
7
Si9168DB
Vishay Siliconix
Efficiency
The demo board is designed for the optimum efficiency performance without sacrificing the cost and form factor issues. Figures 13,
14 and 15 depict the efficiency performance of demo boards in PSM and PWM operation.
100
Efficiency —Buck, VOUT = 3.6 V
Efficiency—Buck, VOUT
100
PSM = 5 VIN
PSM = 5 VIN
90
PWM = 5 VIN
80
PWM = 7.2 VIN
PSM = 7.2 VIN
PWM = 8.4 VIN
70
Efficiency (%)
Efficiency (%)
90
PWM = 5 VIN
80
PSM = 8.4 VIN
PSM = 8.4 VIN
60
PWM = 8.4 VIN
60
50
10
100
1000
10000
50
10
Load Current (mA)
FIGURE 13.
100
Efficiency (%)
10000
FIGURE 14.
Efficiency Si9168DB-K3, 2.5-A IOUT Buck Regulator
The Typical coil waveforms in PWM and PSM operation is
shown in Figure 17 through Figure 19 for buck and boost
conversion application. The outputs were loaded at the rated
load in PWM and no spikes observed during the main switch
turn on. Output load was 150 mA, in case of PSM. The
coil/drain waveforms for the 2.5-A buck are similar to the 1.5-A
buck converter.
PWM = 5.4 VIN
PWM = 6.0 VIN
80
PSM = 6.0 VIN
PSM = 7.0 VIN
1000
Coil/Drain Waveforms
Efficiency —Boost, VOUT = 7.2 V
PSM = 5.4 VIN
100
Load Current (mA)
Efficiency Si9168DB-K1, 1.5-A IOUT Buck Regulator
90
PWM = 7.2 VIN
PSM = 7.2 VIN
70
PWM = 7.0 VIN
70
60
50
10
100
1000
10000
Load Current (mA)
FIGURE 15. Efficiency Si9168DB-S1, 2.5-A IOUT Boost
R
l t
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Document Number: 71159
16-Feb-00
Si9168DB
Vishay Siliconix
VIN = 7.2 V
VOUT = 3.6 V @ 1.5 A
PWM
FIGURE 16. Coil/Drain Waveforms, PWM
Si9168DB-K1, 1.5–A Buck Regulator
VIN = 5 V
VOUT = 7.2 V @ 2.5 A
PWM
FIGURE 18. Coil/Drain Waveforms, PWM
Si9168DB-S1, 2.5–A Boost Regulator
VIN = 7.2 V
VOUT = 3.6 V @ 150 mA
PSM
FIGURE 17. Coil/Drain Waveforms, PSM
Si9168DB-K1, 1.5–A Buck Regulator
VIN = 5 V
VOUT = 7.2 V @ 150 mA
PSM
FIGURE 19. Coil/Drain Waveforms, PSM
Si9168DB-S1, 2.5–A Boost Regulator
PWM/PSM Output Ripple and Noise
Special care is required to correctly measure the ripple
performance. A well-shielded probe and 100-MHz
oscilloscope bandwidth is recommended to avoid any pick-up
through the oscilloscope and falls reading. Also, connect the
probe right across the output terminals P3 and P4 avoiding a
long loop. The peak-to-peak ripple can be further reduced by
adding a small additional LC (100 nH/1 F) after the output
capacitor and sensing network. The boost converter ripple is
measured right across the output capacitor C2, with 20-MHz
oscilloscope bandwidth.
VIN = 7.2 V
VOUT = 3.6 V @ 1.5 A
PWM
FIGURE 20. Output Ripple, PWM
Si9168DB-K1, 1.5–A Buck
R
l
Document Number: 71159
16-Feb-00
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Si9168DB
Vishay Siliconix
VIN = 7.2 V
VOUT = 3.6 V @ 150 mA
PSM
FIGURE 21. Output Ripple, PSM
Si9168DB-K1, 1.5–A Buck
R
l
VIN = 7.2 V
VOUT = 3.6 V @ 150 mA
PSM
FIGURE 23. Output Ripple, PSM
Si9168DB-K2, 2.5–A Buck
R
l
VIN = 7.2 V
VOUT = 3.6 V @ 2.5 A
PWM
FIGURE 22. Output Ripple, PWM
Si9168DB-K2, 2.5–A Buck
R
l
VIN = 5 V
VOUT = 7.2 V @ 2.5 A
PWM
FIGURE 24. Output Ripple, PWM
Si9168DB-S1, 2.5–A Boost
R
l
VIN = 5 V
VOUT = 7.2 V @ 150 mA
PSM
FIGURE 25. Output Ripple, PSM
Si9168DB-S1, 2.5-A Boost
R
l
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Document Number: 71159
16-Feb-00
Si9168DB
Vishay Siliconix
Dynamic Load Response
The application circuit is compensated with Level 3 network for
optimum closed loop bandwidth. The load transients are
applied at a high slew rate of 1 A/S and output voltage is
monitored right at the output pins P3 and P4. Refer to
Figures 26 through 30 for the dynamic load behavior in
PWM/PSM operation for buck and boost configuration.
VIN = 7.2 V, VO = 3.6 V
Slew Rate – 1A/sec
ISTEP = 0.3 – 1.5 A
Ch 3 – Load (1A/div)
Ch4 – Output (200 mV/div)
FIGURE 26. Transient Load Response, PWM
Si9168DB-K1, 1.5-A Buck Regulator
VIN = 7.2 V, VO = 3.6 V
Slew Rate – 1A/sec
ISTEP = 25 – 300 mA
Ch 3 – Load (100 mA/div)
Ch4 – Output (100 mV/div)
FIGURE 27. Transient Load Response, PSM
Si9168DB-K1, 1.5-A Buck Regulator
VIN = 5.4 V, VOUT = 7.2 V
Slew Rate – 1A/sec
ISTEP = 25 – 300 mA
Ch 3 – Load (200 mA/div)
Ch4 – Output (50 mV/div)
FIGURE 29. Transient Load Response, PSM
Si9168DB-S1, 2.5-A Boost Regulator
Document Number: 71159
16-Feb-00
VIN = 5.4 V, VOUT = 7.2 V
Slew Rate – 1A/sec\
ISTEP = 1.25 – 2.5 A
Ch 3 – Load (1A/div)
Ch4 – Output (200 mV/div)
FIGURE 28. Transient Load Response, PWM
Si9168DB-S1, 2.5-A Boost Regulator
VIN = 7.2 V
ISTEP = 1.25–2.5 A
Slew Rate = 1 A/sec
Ch1 – Output (100 mV/div)
Ch 3 – Load (1 A/div)
FIGURE 30. Transient Load Response, PWM
Si9168DB-K2, 2.5-A Buck Regulator
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Si9168DB
Vishay Siliconix
TABLE 3. BILLĆOFĆMATERIALSĊSi9168DBĆK1
Qty
Designator
Part Type
Description
Footprint
Vendor Part #
Manufacturer
1
2
2
1
R1, R7
51 W
Resistor, 1/8 W, 1%
0805
CRCW08055100FRT1
Vishay Dale
R2
200 W
Resistor, 1/8 W, 1%
0805
CRCW08052000FRT1
Vishay Dale
3
1
4
1
R3
22 kW
Resistor, 1/8 W, 1%
0805
CRCW08052201FRT1
Vishay Dale
R4
12.4 kW
Resistor, 1/8 W, 1%
0805
CRCW08051242FRT1
5
1
Vishay Dale
R5
75 kW
Resistor, 1/8 W, 1%
0805
CRCW08057502FRT1
Vishay Dale
6
7
1
R6
8.2 W
Resistor, 1/8 W, 1%
0805
CRCW08058201FRT1
Vishay Dale
2
R8, R9
5.6 W
Resistor, 1/8 W, 1%
0603
CRCW06032R70JRT1
Vishay Dale
8
1
C1
22 mF
CAP, CER, 16 V
2210
C25Y5U1C226Z
Tokin
9
1
C2
10 mF
CAP, CER, 10V
1210
GRM42-2X5R106K010
Murata
10
4
C3, C5, C8, C9
0.1 mF
CAP, CER
0805
VJ0805Y104KXXAT
Vishay Vitramon
11
1
C4
330 pF
CAP, CER
0805
VJ0805Y331KXXAT
Vishay Vitramon
12
1
C6
1000 pF
CAP, CER
0805
VJ0805Y102KXXAT
Vishay Vitramon
13
1
C7
56 pF
CAP, CER
0805
VJ0805Y560KXXAT
Vishay Vitramon
14
1
D1 (NU)
B130LB
Schottky Diode
SMB
B130LB
Vishay Liteon
15
1
D01
MBR0520T1
Schottky Diode
SOD-123
MBR0520T1
Motorola
16
1
L1
4.7 mH
4.7 mH Inductor
IHLP2525
IHLP2525-4.7uH
Vishay Dale
17
1
U1
Si9168
Power IC
TSSOP-16
Si9168BQ - T1
Vishay Siliconix
18
1
Q1
Si6803DQ
Dual N- and P-Channel
TSSOP-8
SI6803DQ
Vishay Siliconix
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Document Number: 71159
16-Feb-00
Si9168DB
Vishay Siliconix
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TABLE 4. BILLĆOFĆMATERIALSĊSi9168DBĆK2
Qty
Designator
1
2
R1, R7
2
1
R2
3
1
R3
4
1
5
Part Type
Description
Footprint
Vendor Part #
Manufacturer
51 W
Resistor, 1/8 W 1%
0805
CRCW08055100FRT1
Vishay Dale
200 W
Resistor, 1/8 W, 1%
0805
CRCW08052000FRT1
Vishay Dale
22 kW
Resistor, 1/8 W, 1%
0805
CRCW08052201FRT1
Vishay Dale
R4
12.4 kW
Resistor, 1/8 W, 1%
0805
CRCW08051242FRT1
Vishay Dale
2
R5
75 kW
Resistor, 1/8 W, 1%
0805
CRCW08057502FRT1
Vishay Dale
6
1
R6
8.2 kW
Resistor, 1/8 W, 1%
0805
CRCW08058201FRT1
Vishay Dale
7
2
R8, R9
2.7 W
Resistor, 1/8 W, 5%
0603
CRCW06032R70JRT1
Vishay Dale
8
2
C1, C2
22 mF
CAP, CER, 16 V
2210
C25Y5U1C226Z
Tokin
9
4
C3, C5, C8, C9
0.1 mF
CAP, CER
0805
VJ0805Y104KXXAT
Vishay Vitramon
10
1
C4
330 pF
CAP, CER
0805
VJ0805Y331KXXAT
Vishay Vitramon
11
1
C6
1000 pF
CAP, CER
0805
VJ0805Y102KXXAT
Vishay Vitramon
12
1
C7
56 pF
CAP, CER
0805
VJ0805Y560KXXAT
Vishay Vitramon
13
1
D1
B130LB
Schottky Diode
SMB
B130LB
Vishay Liteon
14
1
L1
1.5 mH
1.5-mH Inductor
L_IHLP2525
IHLP2525-1.5 mH
Vishay Dale
15
1
U1
Si9168
Power IC
TSSOP-16
Si9168BQ-T1
Vishay Siliconix
16
1
Q1
Si9801DY
Single P-Channel MOSFET
SO-8
Si9801DY
Vishay Siliconix
Document Number: 71159
16-Feb-00
www.siliconix.com FaxBack 408-970-5600
13
Si9168DB
Vishay Siliconix
TABLE 5. BILLĆOFĆMATERIALSĊSi9168DBĆS1
Item
Qty
Designator
Part Type
Description
Footprint
Vendor Part #
Manufacturer
1
2
R1, R7
51 W
Resistor, 1/8 W 1%
0805
CRCW080551R0FRT1
Vishay Dale
2
1
R2
1kW
Resistor, 1/8 W, 1%
0805
CRCW08051002FRT1
Vishay Dale
3
1
R3
56.2 kW
Resistor, 1/8 W, 1%
0805
CRCW08055622FRT1
Vishay Dale
4
1
R4
12.4 kW
Resistor, 1/8 W, 1%
0805
CRCW08051242FRT1
Vishay Dale
5
1
R5
75 kW
Resistor, 1/8 W, 1%
0805
CRCW08057502FRT1
Vishay Dale
6
1
R6
4.7 kW
Resistor, 1/8 W, 1%
0805
CRCW08054701FRT1
Vishay Dale
7
1
C1
10 mF
CAP, CER, 25 V
1210
GRM43-2X5R106K025
Murata
8
1
C2
47 mF
CAP, CER, 16 V
2220
C55Y5U1C476Z
Tokin
9
3
C3, C5, C8
0.1 mF
CAP, CER, X7R, 50 V, 10%
0805
VJ0805Y104KXAAT
Vishay Vitramon
10
1
C4
560 pF
CAP, CER, X7R, 50 V, 10%
0805
VJ0805Y561KXAAT
Vishay Vitramon
11
1
C6
0.0056 mF
CAP, CER, X7R, 50 V, 10%
0805
VJ0805Y562KXAAT
Vishay Vitramon
12
1
C7
220 pF
CAP, CER, X7R, 50 V, 10%
0805
VJ0805Y221KXAAT
Vishay Vitramon
13
1
D1
B130LB
Schottky Diode
SMB
B130LB
Vishay Liteon
14
1
L1
1.5 mH
1.5 mH Inductor
L_IHLP2525
IHLP-2525AH-1.5uH
Vishay Dale
15
1
U1
Si9168BQ
Power IC
TSSOP-16
Si9168BQ-T1
Vishay Siliconix
16
1
Q1
Si9803DY
P-Channel MOSFET
SO-8
Si9803DY
Vishay Siliconix
17
1
Q2
Si3442DV
N-Channel MOSFET
TSOP-6
Si3442DV
Vishay Siliconix
www.Vishay Siliconix.com FaxBack 408-970-5600
14
Document Number: 71159
16-Feb-00