S-8363 Series STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz www.ablic.com PWM / PFM SWITCHABLE SWITCHING REGULATOR www.ablicinc.com ABLIC Inc., 2010 Rev.2.0 02 The S-8363 Series is a CMOS step-up switching regulator which consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a current limit circuit, and a start-up circuit. Due to the operation of the PWM / PFM switching control, pulses are skipped under the light load operation and the S-8363 Series prevents decrease in efficiency caused by ICs operating current. The S-8363 Series is capable of start-up from 0.9 V (I = 1 mA) by the start-up circuit, and is suitable for applications OUT which use one dry cell. The output voltage is freely settable from 1.8 V to 5.0 V by external parts. Ceramic capacitors can be used for output capacitor. Small packages SNT-6A and SOT-23-6 enable high-density mounting. Features Low operation voltage : Start-up from 0.9 V (I = 1 mA) guaranteed OUT Oscillation frequency : 1.2 MHz Input voltage range : 0.9 V to 4.5 V Output current : 300 mA (V = 1.8 V, V = 3.3 V) IN OUT Reference voltage : 0.6 V 2.5% Efficiency : 85% Soft start function : 1.2 ms typ. Low current consumption : During switching-off, 95 A typ. Duty ratio : PWM / PFM switching control max.88% Power-off function : Current consumption during power-off 3.0 A max. Current limit circuit : limits the peak value of inductor current Nch power MOS FET ON resistance : 0.25 typ. Start-up function : Operation with fixed duty pulse under the V voltage of 1.4 V or less OUT *1 Lead-free, Sn 100%, halogen-free *1. Refer to Product Name Structure for details. Applications MP3 players, digital audio players Digital cameras, GPS, wireless transceiver Portable devices Packages SNT-6A SOT-23-6 1 STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR S-8363 Series Rev.2.0 02 Block Diagram L = 2.2 H SD V OUT CONT VOUT Internal SLOPE V IN Oscillation Power Supply Compensation Circuit ON/OFF ON/OFF Circuit STU Mode R FB1 Circuit V Current OUT C FB Limit Circuit C OUT Error Amplifier FB 10 F VIN Switching MUX Control V IN C IN Circuit R FB2 PWM Start-up Reference Circuit Comparator Voltage Source VSS Figure 1 2