전자부품 데이터시트 검색엔진 |
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SS6622 데이터시트(PDF) 8 Page - Silicon Standard Corp. |
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SS6622 데이터시트(HTML) 8 Page - Silicon Standard Corp. |
8 / 12 page www.SiliconStandard.com 8 of 12 SS6620/21/2 SS6622 PIN 1: FB- Connect to OUT for +3.3V output. Use a resistor network to set the out- put voltage from +1.8V to +4.0V. PIN 2: LBI- Low-Battery comparator input. Inter- nally set to trip at +1.23V. PIN 3: LBO- Open-drain low battery comparator output. Output is low when VLBI is <1.23V. LBO is high impedance dur- ing shutdown. PIN 4: CLSEL- Current-limit selects input. CLSEL= OUT sets the current limit to 0.8A. CLSEL=GND sets the current limit to 0.45A. PIN 5: REF- 1.23V reference voltage. Bypass with a 0.1 µF capacitor. PIN 6: SHDN- Shutdown input. High=operating, low=shutdown. PIN 7: BATT- Battery input and damping switch connection. If damping switch is unused, leave BATT unconnected. PIN 8: GND- Ground. PIN 9: LX- N-channel and P-channel power MOSFET drain. PIN 10: OUT- Power output. OUT provides boot- strap power to the IC. n APPLICATION INFORMATION Overview The SS6620/21/22 series are high efficiency, step-up DC/DC converters, designed to feature a built-in synchronous rectifier, which reduces size and cost by eliminating the need for an external Schottky diode. The start-up voltage is as low as 0.8V and they can operate with an input voltage down to 0.7V. Qui- escent supply current is only 20 µA. In addition, the SS6622 feature a circuit that eliminates inductor- ringing to reduce noise. The internal P-MOSFET on- resistance is typically 0.3 Ω to improve overall effi- ciency by minimizing AC losses. The current limit of the SS6620 and SS6621 is 0.8A and 0.45A respectively. The SS6622 offers a selectable current - limit (0.45A or 0.8A). The lower current limit allows the use of a physically smaller inductor in space- sensitive applications. PFM Control Scheme The key feature of the SS6620 series is a unique minimum-off-time, current-limited, pulse-frequency- modulation (PFM) control scheme (see BLOCK DIAGRAM) with ultra-low quiescent current. A con- stant-peak-current limit in the switching allows the in- ductor current to vary between this peak limit and some lesser value. The peak current of the internal N- MOSFET power switch can be fixed at 0.8A, 0.45A or is selectable. The ripple voltage does not exceed the product of the peak current limit and the filter capaci- tor equivalent-series-resistance (ESR). The switch frequency depends on the loading condition and input voltage, and can range up to 500KHz. The switching frequency is governed by a pair of one-shots that set a minimum off-time (1 µs) and a maximum on-time (4 µs). Rev.2.01 6/06/2003 |
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