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SS8028T11TB Datasheet(PDF) 6 Page - Silicon Standard Corp. |
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SS8028T11TB Datasheet(HTML) 6 Page - Silicon Standard Corp. |
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6 / 9 page  www.SiliconStandard.com 6 of 9 SS8028 BLOCK DIAGRAM APPLICATIONS INFORMATION The SS8028 is a boost converter with an integrated N-channel MOSFET (refer to the block diagram above). The boost cycle is initiated when the FB pin voltage drops below 1.2V and the MOSFET turns on. During the period that the MOSFET is on, the inductor current ramps up until the 350mA current limit is reached. Then the MOSFET turns off and the inductor current flows through the external schottky diode, ramping down to zero. During the MOSFET off period, the inductor current charges the output capacitor and the output voltage climbs. This pumping mechanism continues cycle by cycle until the FB pin voltage exceeds 1.2V and the non-switching mode starts. In this mode, the SS8028 consumes as little as 20uA typically, saving on battery power. Choosing an Inductor There are several recommended inductors that work well with the SS8028 in Table 1. Use the equations and recommendations in the next few sections to find the proper inductance value for your design. TABLE 1. RECOMMENDED INDUCTORS PART VALUE(uH) MAX DCR ? Ω) VENDOR LQH3C4R7 LQH3C100 LQH3C220 4.7 10 22 0.26 0.30 0.92 Murata www.murata.com CD43-4R7 CD43-100 CDRH4D18-4R7 CDRH4D18-100 4.7 10 4.7 10 0.11 0.18 0.16 0.20 Sumida www.sumida.com DO1608-472 DO1608-103 DO1608-223 4.7 10 22 0.09 0.16 0.37 Coilcraft www.coilcraft.com Inductor Selection – Boost Regulator The appropriate inductance value for the boost regulator application may be calculated from the following equation. Select a standard inductor close to this value. VOUT-VIN(MIN)+VD L = ILIM x tOFF + + VREF BIAS SHUTDOWN LOGIC C2 SW L1 SHDN VCC C1 R1 R2 VOUT FB ERROR COMP 1.2 V en _sw GND PUMP CONTROL OC COMP DRIVER T OFF PULSE CONTROL V OUT V IN + + VREF BIAS SHUTDOWN LOGIC C2 SW L1 SHDN VCC C1 R1 R2 VOUT FB ERROR COMP 1.2 V en _sw GND PUMP CONTROL OC COMP DRIVER T OFF PULSE CONTROL V OUT V IN Rev.2.02 12/06/2003 |
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