S-8821

S-8821 Series www.ablic.com © ABLIC Inc., 2002-2021 VOLTAGE REGULATION BOOST CHARGE PUMP DC-DC CONVERTER Rev.5.2_00 The S-8821 series is a CMOS boost charge pump DC-DC converter with a voltage regulation function. The S-8821 series consists of an oscillation circuit, a controller, a reference voltage circuit, an error amplifier circuit, and an output switching transistor, and can regulate the output voltage by PFM control. Since small ceramic capacitors can be used for the pump capacitor, input capacitor, and output capacitor, the mounting area can be minimized.  Features PFM control CMOS boost charge pump Power supply voltage: Output voltage: Output voltage accuracy: Built-in soft start circuit: Output current Oscillation frequency: ON/OFF function: Lead-free, Sn 100%, halogen-free*1 1.6 to 5.0 V 2.5 to 5.5 V, selectable in 0.1 V steps. ±2 % max. 1.0 ms typ. 25 mA (VIN=(VOUT(S) × 0.80) V) 1.0 MHz typ. During standby: 1 μA max. *1. Refer to “ Product Name Structure” for details.  Applications Lithium ion battery driven applications Local power supply Power supply for white LED display backlights  Packages SOT-23-6W SNT-8A 1 VOLTAGE REGULATION BOOST CHARGE PUMP DC-DC CONVERTER S-8821 Series  Block Diagram VIN CIN=4.7 μF SW1 C+ CPUMP=0.10 μF C− SW2 SW3 SW4 Switch control circuit Soft start circuit PFM control oscillator circuit (1.0 MHz) Rs + Rf - ON/OFF circuit Reference voltage Rev.5.2_00 VOUT COUT=10 μF ON/OFF Figure 1...