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SS6652CSTR Datasheet(PDF) 1 Page - Silicon Standard Corp. |
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SS6652CSTR Datasheet(HTML) 1 Page - Silicon Standard Corp. |
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1 / 6 page  www.SiliconStandard.com 1 of 6 SS6652 Micro-Power Inverting DC/DC Controller n FEATURES l 2.4V to 7V input voltage operation. l Adjustable output voltage up to -40V. l Low quiescent current at 80 µA. l Pulse frequency modulation maintains high efficiency (87%). l 70KHz to 160KHz switching frequency. l Power-saving shutdown mode (0.7 µA typical). l High efficiency with low cost external P- channel MOSFET or PNP bipolar transistor. n APPLICATIONS l Negative LCD Contrast Bias for 1. Notebook & Palmtop Computers. 2. Pen-Based Data System. 3. Portable Data Collection Terminals. 4. Personal Digital Assistants. l Negative Voltage Supply. n DESCRIPTION The SS6652 is a high-performance inverting DC/DC controller, designed to drive an external power switch to generate programmable negative voltages, and is particularly suited to LCD bias contrast applications. Efficiency of 87% can be achieved with low cost PNP bipolar transistor drivers. Output voltage can be scaled to -40V or greater by two external resistors. A pulse fre- quency modulation scheme is employed to main- tain high-efficiency conversion over a wide input voltage range. Quiescent current is about 80 µA and can be reduced to 0.7 µA in shutdown mode. With switching frequencies in the 70KHz to 160KHz range, the small size switching compo- nents are ideal for battery powered portable equipment, like notebook and palmtop computers. n TYPICAL APPLICATION CIRCUIT D1 1N5819 SS6652 CL DHI DLOW FB GND SHDN VIN VREF C3 10nF C4 0.047 µF 150 µH *L Q1 9012 RB 470~1.8K R1 1M C2 C1 VIN 2.4V ~ 7V VOUT -12V~ -40V -10mA 100 µF * Sumida CD-54 Series VOUT = -1.22V x R1/R2 100 µF + + R2 100K RCL Negative LCD Contrast Bias Power Supply Rev.2.01 6/26/2003 |
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