SI9130DB

Si9130DB Vishay Siliconix Si9130DB Si9130 Demonstration Board FEATURES • • • • 5- and 3.3-V Step-Down Synchronous Converters Less than 500-µA Quiescent Current 25-µA Shutdown Current 5.5- to 30-V Input Operating Range DESCRIPTION The Si9130 Dual-Output Power-Supply Controller for Notebook Computers is a system level integration of two stepdown controllers with micropower 5- and 3.3-V linear regulators. The controllers perform high efficiency conversion of the battery pack energy (typically 12 V) or the output of an ac-to-dc wall converter (typically 18 V to 24 V dc) to 5- and 3.3-V system supply voltages. The micropower linear regulator can be used to keep power management and backup circuitry alive during the shutdown of the step-down converters. The 3.3-V output is adjustable to 3.3 V, 3.45 V or 3.6 V by programming control pins 3.45 ADJ and 3.6 ADJ. Leaving both pins open results in 3.3-V nominal output. Grounding pin 3.45 ADJ while leaving 3.6 ADJ open delivers 3.45-V nominal output. Grounding pin 3.6 ADJ while leaving 3.45 ADJ open delivers 3.6-V nominal ouput. On the Demo Board, the Si9130 is configured as a complete system, ready for operation. It takes 5.5- to 30-V in, and produces regulated 5 V at any current from no load to 3 A, and 3.3 V out at any current from no load to 3 A. Included in this document are the Bill of Materials, Demo Board Schematic, and PCB layout. The demonstration board layout is available in Gerber file format. Please contact your VISHAY sales representative or distributor for a copy. ORDERING INFORMATION: PART NUMBER Si9130DB POWER-UP CHECK LIST—INSTALLED IN VRM MOTHER BOARD SOCKET 1. Start by setting the control switches located in the bottom right corner of the Demo Board. Set the top switch to the left, setting the switching frequency to 200 kHz (to the right is 300 kHz). Set the second switch down to the right, turning the 5-V converter on (to the left is off). Set the third switch down to the right, turning the 3.3-V converter on (to the left is off). Set the bottom switch to the right, allowing the PWM to operate (to the left is shutdown). 2. Attach an electronic load set in resistive mode to the 3.3-V output pins. Set the current to 100 mA. Alternatively, you can use a resistor of value 33 Ω, 1 W. 3. Attach an electronic load set in resistive mode to the 5-V output pins. Set the current to 100 mA. Alternatively, you can use a resistor of value 50 Ω, 1 W. 4. Attach a 10-V supply and ground to the pins on the top side of the board. It is best to use a separate wire from the supply’s ground to each of the Demo Board’s ground pins, because of the high currents at low input voltages. 5. Take an oscilloscope probe, and place the ground on the 5-V GND pin, and the probe on the 5-V pin. Set the vertical scale for this channel at ac coupled at 50 mV/div. Take a second probe, and place the ground on the 5-V GND pin, and the probe on pin 17 (LX5) of the Si9130. Set this channel at dc coupled 2 V/div. Set the time base at 200 µsec/div. 6. Leave the probes in place. Change the scale on the second probe (the one attached to pin 17) to 10 V/div, and the time base to 500 nsec/div. Set the 5-V output current on the electronic load to 1 A. Set the input power supply to 16 V. Alternatively, first turn off the input power supply, and replace the 50-W resistor with a 5-Ω, 10-W resistor, and then turn the input power supply back on, setting it to 16 V. 7. This step should be performed only if an electronic load is being used. Set the input voltage to 15 V. Remove the second probe (the one attached to pin 17 of the Si9130), or turn off the channel displaying it. Place a current probe around the wire leading from the 5-V output to the electronic load, and set the oscilloscope and amplifier so that it will display approximately 2 A/div. Set the oscilloscope time base back to 200 µsec/div. Set the 3.3-V electronic load to have a constant 1-A load. Now set up the 5-V electronic load so that it cycles between 100 mA and 3 A at approximately 1 kHz (1 msec period). 8. This step should be performed only if an electronic load is being used. Set the 5-V electronic load back to a constant 1-A current. Remove the voltage probe from the 5-V output. Move the ground of the probe onto the GND pin of the 3.3-V output, and the probe onto the 3.3-V output pin. Remove the current probe from the 5-V output wire, and place it around the wire leading from the 3.3-V output to the electronic load. Now set up the 3.3-V electronic load so that it cycles between 100 mA and 3 A at approximately 1 kHz (1 msec period). FaxBack 408-970-5600, request 70725 www.siliconix.com 10-Feb-97 1 Si9130DB Vishay Siliconix FIGURE 1. Top Silkscreen FIGURE 2. Top Layer FIGURE 3. Bottom Layer 10-Feb-97 2 FaxBack 408-970-5600, request 70725 www.siliconix.com Si9130DB Vishay Siliconix Si9130DB APPLICATION CIRCUIT 10-Feb-97 3 FaxBack 408-970-5600, request 70725 www.siliconix.com Si9130DB Vishay Siliconix BILL OF MATERIAL FOR Si9130 DUAL-OUTPUT POWER SUPPLY Part 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Used 1 2 4 1 2 1 2 6 1 1 1 2 1 2 2 1 2 1 Reference Designators U1 L1, L2 N1-N4 SW1 D1, D3 CR2 R1, R2 R3-R6 R9 R10 R11 C1, C10 C2 C3 C4, C5 C6, C7, C11, C12 C8, C9 C13 Part Type Si9130 10 µH Si9410DY SPST 1N5819 CMPD2836 0.025 Ω, 1% 1 MΩ 1 kΩ Open 100 Ω 33 µF, 35 V 4.7 µF, 6 V 1 µF, 20 V 0.1 µF, 16 V 330 µF, 6 V 0.01 µF, 16 V 0.1 µF, 35 V Description/Part Number D-O PWR Supply, Si9130 Inductor, 10 µH, CRD125-100 N-Channel MOSFET, Si9410DY SW-SPST Diode, 1N5819 Diode, CMPD2836 Resistor, LR2010-01-R025F Resistor, CRCW0805105JRT1 Resistor, CRCW0805102JRT1 Resistor, (Open) Resistor, CRCW0805101JRT1 Capacitor, Tantalum, 595D336X0035SR Capacitor, Ceramic, 1206YG475ZAT Capacitor, Tantalum, TAJA105M025 Capacitor, VJ0805Y104KXXAT Capacitor, Tantalum, TPSE337M006R0100 Capacitor, VJ0805Y103KXXAT Capacitor, VJ0805Y104KXAAT Pattern SSOP-28 CDR125-100 SO-8 DIP-4 SOD-87 SOT-23 2010 0805 0805 0805 0805 R 1206 A 0805 E 0805 0805 Manufacturer Vishay Siliconix Sumida Vishay Siliconix Multi-Source Nikon Central Semiconductor IRC Vishay Dale Vishay Dale Multi-Source Vishay Dale Vishay Sprague AVX AVX Vishay Vitramon AVX Vishay Vitramon Vishay Vitramon 10-Feb-97 4 FaxBack 408-970-5600, request 70725 www.siliconix.com