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SS6621COTR Datasheet(PDF) 1 Page - Silicon Standard Corp. |
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SS6621COTR Datasheet(HTML) 1 Page - Silicon Standard Corp. |
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1 / 12 page  www.SiliconStandard.com 1 of 12 SS6620/21/2 High Efficiency Synchronous Step-Up DC/DC Converter n FEATURES l High efficiency of 93% (VIN=2.4V, VOUT=3.3V, IOUT=200mA). l Quiescent supply current of 20 µA. l Power-saving shutdown mode (0.1 µA typical). l Internal synchronous rectifier (no external diode ) l Selectable current limit for reduced ripple (SS6622). l Low noise, anti-ringing feature (SS6622) l On-chip low-battery detector. l Low-battery hysteresis n APPLICATIONS l Palmtop & notebook computers. l PDAs l Wireless phones l Pocket organizers. l Cameras. l 1 to 2-cell hand-held devices n DESCRIPTION The SS6620/21/22 are high-efficiency step- up DC/DC converters, with start-up voltage as low as 0.8V and operating with an input voltage down to 0.7V. Consuming only 20 µA of quies- cent current, these devices offer a built-in syn- chronous rectifier that reduces size and cost by eliminating the need for an external Schottky diode, improving overall efficiency by minimiz- ing losses. The switching frequency depends on the load and the input voltage and can range up to 500KHz. The peak current of the internal switch is fixed at 0.8A (SS6620), at 0.45A (SS6621), or is selectable (SS6622) for design flexibility. Ripple does not exceed the product of the switch current limit and the filter capacitor equivalent-series-resistance (ESR). The SS6622 also features a circuit that eliminates noise caused by inductor ringing. n TYPICAL APPLICATION CIRCUIT Output 3.3V, or Adj. (1.8V to 4.0V) up to 300mA Low-Battery Detect Out FB GND + ON OFF + Low-Battery Detect In 0.1 µF VIN 22 µH 220 µF 100 µF SS6620 SS6621 SS6622 OUT REF LBO SHDN LX LBI LBO FB Rev.2.01 6/06/2003 |
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