台湾致新 G2156K11U TQFN4X4-32 代理商主推

　　General Description

　　The G2156 device features four synchronous 5.5V

　　input range high efficiency buck converters. The converters are designed to simplify its application while

　　giving the designer the option to optimize their usage

　　according to the target application.

　　The converters can operate in 5V systems and have

　　integrated power transistors. The output voltage can

　　be set externally using a resistor divider to any value

　　between 0.8V and close to the input supply. Each

　　converter features enable pin that allows a delayed

　　start-up for sequencing purposes. The current mode

　　control allows a simple RC compensation.

　　The switching frequency of the converters can operate

　　1 MHz.

　　The G2156 features a supervisor circuit that monitors

　　each converter output. The PGOOD pin is asserted

　　once sequencing is done, all PG signals are reported

　　and a selectable end of reset time lapses. The polarity

　　of the PGOOD signal is active high.

　　The G2156 Buck1/3/4 also features a light load pulse

　　skipping mode, PSM mode allows for a reduction on

　　the input power supplied to the system when the host

　　processor is in stand-by (low activity) mode. SKIP1

　　PIN is setting Buck1 skipping mode.

　　Features

　　Continuous Loading: 3A (Buck1), 1A (Buck2,

　　3 and 4)

　　1MHz Switching Frequency

　　0.8V ± 2% Voltage Reference Over Temperature

　　External Enable/Sequencing and Soft Start Pins

　　Adjustable Soft Start

　　Power Good Output

　　Cycle by Cycle Current Limit, Thermal and

　　Overload protection.

　　Thermally Enhanced 4mm × 4mm 32-pin QFN

　　Applications

　　Set Top Boxes

　　Blue-ray DVD

　　应用电路图: