70727| Datasheet

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Si9160DB
Vishay Siliconix
Si9160DB

Si9160 Demonstration Board

FEATURES
Synchronous Boost Converter with Efficiency up to 93% 1-MHz Switching Frequency Operates with Input Voltages of 3.0 V to 5 V 5-V Output at 0 A to 1.0 A

DESCRIPTION
The Si9160 Synchronous Boost Controller combined with high frequency Si6801 MOSFET provides efficiency up to 93% at 1-MHz switching frequency. In the past, switching frequency beyond 300 kHz was not realizable due to high switching loss in the MOSFET. The Si6801 high frequency MOSFET has been specifically designed to minimize gate charge and turn on/off delay time in order to optimize converter efficiency at 1 MHz. This high switching frequency reduces the output inductor and capacitor size without increasing the output voltage ripple. The combination of small component size and high efficiency makes Si9160 synchronous boost converter ideal for RF power amplifiers in cellular or Personal Communications Systems (PCS). The Si9160 demo board has been configured to generate 5-V output with input voltage range of 3.0 V to 5 V. The converter efficiency is greatly enhanced by using the synchronous rectification instead of a free-wheeling Schottky diode. The Si6801 is a complementary MOSFET pair with p- and nchannel
devices in a TSSOP package. The n-channel MOSFET is used as the low-side switch and p-channel is used as the high-side rectifier. The converter efficiency is further enhanced by using the 5-V output to power the Si9160 and the gate drives when the output voltage exceeds the input voltage by a diode drop. The output voltage on the demo board can be easily changed to generate various output voltages by changing resistor value R11 as described by the equation below. Do not change resistor value R10 to generate different output voltages. This might cause instability, if the other feedback components are not adjusted to stabilize the loop. If higher current is required, inductor and MOSFET should be properly adjusted to prevent damaging the board. See the Si9160 data sheet for detailed product information.
R11 = 5.4k/(VOUT - 1.5)

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 Siliconix sales representative or distributor for a copy.

ORDERING INFORMATION: PART NUMBER Si9160DB

FaxBack 408-970-5600, request 70727 www.siliconix.com

14-Jul-97 1