Vishay Si9169 User manual

Si9169DB
Vishay Siliconix
Document Number: 71089
08-Jan-02 www.vishay.com
1
Si9169 Demonstration Board
FEATURES
DVoltage Mode Control
DFully Integrated MOSFET Switches
D1-A Load Capability
D2.7- to 6-V Input Voltage Range for VDD and VS
DProgrammable PWM/PSM Control
DUp to 2-MHz Switching Frequency in PWM
DSynchronous Rectification in PWM
DLess than 200-mA IDD in PSM
DIntegrated UVLO and POR
DIntegrated Soft-Start
DSynchronization
DShutdown Current t1 mA
DWide Bandwidth Feedback Amplifier
DSingle-Cell Li+ and 3-Cell NiCd or NiMH Operation
DESCRIPTION
The Si9169 is the higher power version of Si9165, with 1-A
output current capability compared to 600 mA for Si9165.
The Si9169 controller offers one of the most compact
synchronous buck or boost converter with 2.7- to 6-V input
voltage. The integrated MOSFETs and 2-MHz operating
frequency help shrinking the converter size dramatically.
There are two different version of demo boards (DB), buck and
boost converters, because the Si9169 can be easily
configured to buck or boost modes. The demo board has been
configured to generate 2.7-V regulated output for buck DB
while for boost DB is 3.6 V. The output voltage set point can be
easily adjusted by changing the value of R2(See Figure 1)
using the formula
(1)
R2+R1
VOUT
VREF –1
The typical value of VREF is 1.3 V. It is recommended not to
change R1since that would alter the control loop
compensation.
The PWM/PSM pin can be used to program the controller to
operate in PWM or PSM mode. PWM is normal pulse width
modulation to keep output regulated through out the load
range, while the PSM mode offers better efficiency at light load
to conserve power by skipping switching pulses. Notice the
PSM only gain efficiency advantage at light load and can only
deliver certain load current (about 150 mA) before output
drops out of regulation.
Included in this document are schematics (Figure 1 and
Figure 2), demo board sample waveform (Figure 3 through 6),
PCB layout (Figure 7 through 12), and Bill Of Material (Table 1
and 2).
The demonstration board layout is available in Gerber file format. Please contact your Vishay Siliconix sales representative or
distributor for a copy.
ORDERING INFORMATION: PART NUMBER Si9169DBĆK (BUCK CONVERTER)
Si9169DBĆS (BOOST CONVERTER)
TEST SETUP AND OPERATION
1. Visually inspect demo board and make sure that Jumper 1
is set to Enable and Jumper 2 is set to PWM.
2. Attach an electronic load set to either resistive or current
mode to the output pins (P3 and P4) on the demo board.
Set the load current to 200 mA or equivalent resistor value.
After the converter is powered up, output load current can
be adjusted.
3. Attach a dc power supply, with at least 3-A current
capability, to the input pins (P1 and P2) on the demo board.
The input voltage can be adjusted between 2.7 and 3.6 V
for boost DB or 2.7 to 6 V for buck DB.
4. Put an oscilloscope ground on the input ground, and the
Ch1 probe on the output and connect Ch2 probe on pin 20
of Si9169 (COIL pin). The waveform for buck and boost DB
should appear approximately as shown in Figure 3 and 4,
respectively.
5. To test your DB in PSM, adjust the load to 20 mA. Then
change Jumper 2 setting to PSM. Notice the reduction of
the input current. With the same probe setup mentioned
above, the waveform for buck and boost DB should appear
approximately as shown in Figure 5 and 6, respectively.

Si9169DB
Vishay Siliconix
www.vishay.com
2Document Number: 71089
08-Jan-02
SCHEMATIC DIAGRAMS
FIGURE 1. Schematicsof Si9169 Buck
120
219
318
417
516
615
714
813
912
10 11
COILNC
COILSD
MODEPWM/PSM
PGNDVIN/OUT PGNDVIN/OUT VS
VIN/OUT VO
SYNC
VDD GND
ROSC VREF COMPFB Si9169
JP2
PWM
–PSM
JP1
Enable
Converter
Disable
VDDC7
10 mF
C8
0.1 mF
1P1
VIN
SYNC
1P2
GND 1.3 V
C5
0.1 mF
C1
100 pF C1
1000 pF
R6
3.9 kW
R3
25 kW
C2
0.1 mF
VDD
R4*
50 W
C3
10 mF
C4
220 pF
R5
1 kW
R1
22 kW
1%
R2
20 kW
1%
1
P3
VOUT
2.7 V
600 mA
1
P4
PGND
*Optional
JP1: –SD to VIN for converter ENABLE mode.
–SD to PGND for SHUTDOWN mode.
JP2: PWM/–PSM to VIN for PWM mode.
PWM/–PSM to PGND for PSM mode.
D1
MBR0520T1
L1
1.5 mH
U1
SD
FIGURE 2. Schematicsof Si9169 Boost
120
219
318
417
516
615
714
813
912
10 11
COILNC
COIL
MODEPWM/PSM
PGNDVIN/OUT PGNDVIN/OUT VS
VIN/OUT VO
SYNC
VDD GND
ROSC VREF COMPFB Si9169
JP2
PWM
–PSM
JP1
Enable
Converter
Disable
1P1
VIN
SYNC
1P2
PGND 1.3 V
C5
0.1 mF
C1
47 pF
C7
1200 pF
R6
3.9 kW
R3
25 kW
C2
0.1 mF
R4*
50 W
C3
10 mFC6
270 pF
R5
1 kWR1
22 kW
R2
12.1 kW
1%
1
P3
VOUT
3.6 V, 600 mA
1
P4
GND
*Optional
JP1: –SD to VIN for converter ENABLE mode.
–SD to PGND for SHUTDOWN mode.
JP2: PWM/–PSM to VIN for PWM mode.
PWM/–PSM to PGND for PSM mode.
D1
MBR0520T1
L1
1.5 mH
U1
C8
0.1 mF
C4
10 mF

Si9169DB
Vishay Siliconix
Document Number: 71089
08-Jan-02 www.vishay.com
3
CHANNEL LINEUP FOR FIGURES 3 THROUGH 6
Ch1: Output Voltage
Ch2: COIL Pin (pin 20 of IC) Voltage
FIGURE 3. Buck DB PWM Mode: VIN = 3.6 V, VOUT = 2.7 V,
Load = 200 mA FIGURE 4. Boost DB PWM Mode: VIN = 3 V, VOUT = 3.6 V, Load = 200 mA
FIGURE 5. Buck DB PSM Mode: VIN = 3.6 V, VOUT = 2.7 V,
Load = 20 mA FIGURE 6. Boost DB PSM Mode: VIN = 3 V, VOUT = 3.6 V, Load = 20 mA
VOUT
COIL
VOUT
COIL
VOUT
COIL
VOUT
COIL

Si9169DB
Vishay Siliconix
www.vishay.com
4Document Number: 71089
08-Jan-02
FIGURE 7. Buck—Top Silk Screen
FIGURE 8. Buck—Top Layer
FIGURE 9. Buck—Bottom Layer
FIGURE 10.Boost—Top Silk Screen
FIGURE 11.Boost—Top Layer
FIGURE 12.Boost—Bottom Layer

Si9169DB
Vishay Siliconix
Document Number: 71089
08-Jan-02 www.vishay.com
5
TABLE 1. BUCK DEMO BOARD BILLĆOFĆMATERIAL
Item Qty Designator Part Type Description Footprint Part Number Manufacturer
1 1 R122 k Resistor, 1%, 1/8W 0805 CRCW08052202FRT1 Vishay Dale
2 1 R220 k Resistor, 1%, 1/8W 0805 CRCW08052002FRT1 Vishay Dale
3 1 R325 k Resistor, 1%, 1/8W 0805 CRCW08052502FRT1 Vishay Dale
4 1 R450 Resistor, 5%, 1/8W 0805 CRCW0805500JRT1 Vishay Dale
5 1 R51 k Resistor, 1%, 1/8W 0805 CRCW08051001FRT1 Vishay Dale
6 1 R63.9 k Resistor, 1%, 1/8W 0805 CRCW08053902FRT1 Vishay Dale
7 1 C1100 pF Capacitor, Ceramic 0805 VJ0805101KXXAT Vishay Vitramon
8 3 C2, C5, C80.1 mFCapacitor, Ceramic 0805 VJ0805104KXXAT Vishay Vitramon
9 2 C3, C710 mFCapacitor, Ceramic 1210 GRM42-2X5R106K16 Murata
10 1 C4220 pF Capacitor, Ceramic 0805 VJ0805121KXXXAT Vishay Vitramon
11 1 C61000 pF Capacitor, Ceramic 0805 VJ0805102KXXXAT Vishay Vitramon
12 1 D1MBR0520T1 Schottky Diode SOD-123 MBR0510T1 Motorola
13 1 L11.5 mHIHLP Low Profile Inductor 2525 IHLP2525-1-5 Vishay Dale
14 1 U1Converter Power IC TSSOP-20 Si9169 Vishay Siliconix
15 2 JP1, JP2Jumper 3-Pin Jumper SIP-3 SIP-3 Multi-Source
16 4 P1to P4Header 1-Pin Header TP TP Multi-Source
TABLE . BOOST DEMO BOARD BILLĆOFĆMATERIAL
Item Qty Designator Part Type Description Footprint Part Number Manufacturer
1 1 R122 k Resistor, 1%, 1/8W 0805 CRCW08052202FRT1 Vishay Dale
2 1 R212.1 k Resistor, 1%, 1/8W 0805 CRCW08051212FRT1 Vishay Dale
3 1 R325 k Resistor, 1%, 1/8W 0805 CRCW08052502FRT1 Vishay Dale
4 1 R450 Resistor, 5%, 1/8W 0805 CRCW0805501JRT1 Vishay Dale
5 1 R51 k Resistor, 1%, 1/8W 0805 CRCW08051000FRT1 Vishay Dale
6 1 R63.9 k Resistor, 1%, 1/8W 0805 CRCW08053901FRT1 Vishay Dale
7 1 C147 pF Capacitor, Ceramic 0805 VJ0805470KXXAT Vishay Vitramon
8 3 C2, C5, C80.1 mFCapacitor, Ceramic 0805 VJ0805101KXXAT Vishay Vitramon
9 2 C3, C710 mFCapacitor, Ceramic 1210 GRM42-2X5R106K16 Murata
10 1 C4270 pF Capacitor, Ceramic 0805 VJ0805271KXXAT Vishay Vitramon
11 1 C61200 pF Capacitor, Ceramic 0805 VJ0805123KXXXAT Vishay Vitramon
12 1 D1MBR0520T1 Schottky Diode SOD-123 MBR0510T1 Motorola
13 1 L11.5 mHIHLP Low Profile Inductor 2525 IHLP2525-1-5 Vishay Dale
14 1 U1Converter Power IC TSSOP-20 Si9169 Vishay Siliconix
15 2 JP1, JP2Jumper 3-Pin Jumper SIP-3 SIP-3 Multi-Source
16 4 P1to P4Header 1-Pin Header TP TP Multi-Source