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. www.vishay.com 1 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 www.vishay.com 2 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 www.vishay.com 3 Si9169DB Vishay Siliconix FIGURE 7. Buck—Top Silk Screen www.vishay.com 4 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 www.vishay.com 5