SI9169DB

Si9169DB
Vishay Siliconix
Si9169 Demonstration Board
FEATURES
D
D
D
D
D
D
D
D
D
D
D
D
D
D
Voltage Mode Control
Fully Integrated MOSFET Switches
1-A Load Capability
2.7- to 6-V Input Voltage Range for VDD and VS
Programmable PWM/PSM Control
Up to 2-MHz Switching Frequency in PWM
Synchronous Rectification in PWM
Less than 200-mA IDD in PSM
Integrated UVLO and POR
Integrated Soft-Start
Synchronization
Shutdown Current t1 mA
Wide Bandwidth Feedback Amplifier
Single-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
R2 +
R1
V
OUT
V REF
–1
(1)
The typical value of VREF is 1.3 V. It is recommended not to
change R1 since 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.
Document Number: 71089
08-Jan-02
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.
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Si9169DB
Vishay Siliconix
SCHEMATIC DIAGRAMS
P1
1
VIN
C8
0.1 mF
VDD
C7
10 mF
JP1
JP2
Enable
Converter
PWM
Disable
–PSM
U1
1
2
3
4
5
6
7
SYNC
P2
1
GND
8
1.3 V
L1
20
9
NC
COIL
SD
COIL
PWM/PSM
MODE
VIN/OUT
PGND
VIN/OUT
PGND
VIN/OUT
VS
SYNC
VO
GND
VDD
VREF
10
ROSC
FB
C5
0.1 mF
P3
1
19
1.5 mH
18
D1
17
MBR0520T1
R4*
50 W
R5
1 kW
16
VDD
15
R1
22 kW
1%
C3
10 mF
14
13
C4
220 pF
12
C2
0.1 mF
11
COMP
R3
25 kW
Si9169
R2
20 kW
1%
R6
3.9 kW
C1
100 pF
P4
1
C1
1000 pF
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.
VOUT
2.7 V
600 mA
PGND
*Optional
FIGURE 1. Schematics of Si9169 Buck
P1
1
VIN
JP1
JP2
Enable
Converter
PWM
Disable
–PSM
U1
1
2
3
4
5
6
7
P2
SYNC
8
1
PGND
1.3 V
9
10
20
NC
COIL
SD
COIL
PWM/PSM
MODE
VIN/OUT
PGND
VIN/OUT
PGND
VIN/OUT
VS
SYNC
VO
GND
VDD
VREF
ROSC
FB
C5
0.1 mF
19
D1
18
P3
MBR0520T1
1
17
16
15
R5
1 kW
R4*
50 W
14
C3
10 mF
13
12
11
COMP
R3
25 kW
Si9169
R6
3.9 kW
JP1: –SD to VIN for converter ENABLE mode.
–SD to PGND for SHUTDOWN mode.
C4
10 mF
L1
1.5 mH
C8
0.1 mF
VOUT
3.6 V, 600 mA
R1
22 kW
C6
270 pF
C2
0.1 mF
R2
12.1 kW
1%
P4
C1
47 pF
1
GND
C7
1200 pF
JP2: PWM/–PSM to VIN for PWM mode.
PWM/–PSM to PGND for PSM mode.
*Optional
FIGURE 2. Schematics of Si9169 Boost
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Document Number: 71089
08-Jan-02
Si9169DB
Vishay Siliconix
CHANNEL LINEUP FOR FIGURES 3 THROUGH 6
Ch1:
Ch2:
Output Voltage
COIL Pin (pin 20 of IC) Voltage
VOUT
COIL
FIGURE 3. Buck DB PWM Mode: VIN = 3.6 V, VOUT = 2.7 V,
Load = 200 mA
VOUT
COIL
FIGURE 5. Buck DB PSM Mode: VIN = 3.6 V, VOUT = 2.7 V,
Load = 20 mA
Document Number: 71089
08-Jan-02
VOUT
COIL
FIGURE 4. Boost DB PWM Mode: VIN = 3 V, VOUT = 3.6 V,
Load = 200 mA
VOUT
COIL
FIGURE 6. Boost DB PSM Mode: VIN = 3 V, VOUT = 3.6 V,
Load = 20 mA
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Si9169DB
Vishay Siliconix
FIGURE 7. Buck—Top Silk Screen
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FIGURE 10.Boost—Top Silk Screen
FIGURE 8. Buck—Top Layer
FIGURE 11.Boost—Top Layer
FIGURE 9. Buck—Bottom Layer
FIGURE 12.Boost—Bottom Layer
Document Number: 71089
08-Jan-02
Si9169DB
Vishay Siliconix
TABLE 1. BUCK DEMO BOARD BILLĆOFĆMATERIAL
Item
Qty
Designator
Part Type
Description
1/
8
Footprint
Part Number
Manufacturer
1
1
R1
22 k
Resistor, 1%,
W
0805
CRCW08052202FRT1
Vishay Dale
2
1
R2
20 k
Resistor, 1%, 1/8 W
0805
CRCW08052002FRT1
Vishay Dale
3
1
R3
25 k
Resistor, 1%, 1/8 W
0805
CRCW08052502FRT1
Vishay Dale
4
1
R4
50
Resistor, 5%, 1/8 W
0805
CRCW0805500JRT1
Vishay Dale
5
1
R5
1k
Resistor, 1%, 1/8 W
0805
CRCW08051001FRT1
Vishay Dale
6
1
R6
3.9 k
Resistor, 1%, 1/8 W
0805
CRCW08053902FRT1
Vishay Dale
7
1
C1
100 pF
Capacitor, Ceramic
0805
VJ0805101KXXAT
Vishay Vitramon
8
3
C2, C5, C8
0.1 mF
Capacitor, Ceramic
0805
VJ0805104KXXAT
Vishay Vitramon
9
2
C3, C7
10 mF
Capacitor, Ceramic
1210
GRM42-2X5R106K16
Murata
10
1
C4
220 pF
Capacitor, Ceramic
0805
VJ0805121KXXXAT
Vishay Vitramon
11
1
C6
1000 pF
Capacitor, Ceramic
0805
VJ0805102KXXXAT
Vishay Vitramon
12
1
D1
MBR0520T1
Schottky Diode
SOD-123
MBR0510T1
Motorola
13
1
L1
1.5 mH
IHLP Low Profile Inductor
2525
IHLP2525-1-5
Vishay Dale
14
1
U1
Converter
Power IC
TSSOP-20
Si9169
Vishay Siliconix
15
2
JP1, JP2
Jumper
3-Pin Jumper
SIP-3
SIP-3
Multi-Source
16
4
P1 to P4
Header
1-Pin Header
TP
TP
Multi-Source
Footprint
Part Number
Manufacturer
TABLE 2. BOOST DEMO BOARD BILLĆOFĆMATERIAL
Item
Qty
Designator
Part Type
Description
1
1
R1
22 k
W
0805
CRCW08052202FRT1
Vishay Dale
2
1
R2
12.1 k
Resistor, 1%, 1/8 W
0805
CRCW08051212FRT1
Vishay Dale
3
1
R3
25 k
Resistor, 1%, 1/8 W
0805
CRCW08052502FRT1
Vishay Dale
4
1
R4
50
Resistor, 5%, 1/8 W
0805
CRCW0805501JRT1
Vishay Dale
5
1
R5
1k
Resistor, 1%, 1/8 W
0805
CRCW08051000FRT1
Vishay Dale
6
1
R6
3.9 k
Resistor, 1%, 1/8 W
0805
CRCW08053901FRT1
Vishay Dale
7
1
C1
47 pF
Capacitor, Ceramic
0805
VJ0805470KXXAT
Vishay Vitramon
8
3
C2, C5, C8
0.1 mF
Capacitor, Ceramic
0805
VJ0805101KXXAT
Vishay Vitramon
9
2
C3, C7
10 mF
Capacitor, Ceramic
1210
GRM42-2X5R106K16
Murata
10
1
C4
270 pF
Capacitor, Ceramic
0805
VJ0805271KXXAT
Vishay Vitramon
11
1
C6
1200 pF
Capacitor, Ceramic
0805
VJ0805123KXXXAT
Vishay Vitramon
12
1
D1
MBR0520T1
Schottky Diode
SOD-123
MBR0510T1
Motorola
13
1
L1
1.5 mH
IHLP Low Profile Inductor
2525
IHLP2525-1-5
Vishay Dale
14
1
U1
Converter
Power IC
TSSOP-20
Si9169
Vishay Siliconix
15
2
JP1, JP2
Jumper
3-Pin Jumper
SIP-3
SIP-3
Multi-Source
16
4
P1 to P4
Header
1-Pin Header
TP
TP
Multi-Source
Document Number: 71089
08-Jan-02
Resistor, 1%,
1/
8
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