S-8821 Series VOLTAGE REGULATION www.ablic.com BOOST CHARGE PUMP DC-DC CONVERTER ABLIC Inc., 2002-2021 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: 1.6 to 5.0 V 2.5 to 5.5 V, selectable in 0.1 V steps. Output voltage: Output voltage accuracy: 2 % max. Built-in soft start circuit: 1.0 ms typ. Output current 25 mA (V =(V 0.80) V) IN OUT(S) Oscillation frequency: 1.0 MHz typ. ON/OFF function: During standby: 1 A max. *1 Lead-free, Sn 100%, halogen-free *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 Rev.5.2 00 Block Diagram VIN C =4.7 F IN SW1 VOUT C =10 F OUT R s SW2 C + PFM control Switch + R f C =0.10 F oscillator PUMP control circuit circuit - (1.0 MHz) C SW3 Soft start circuit Reference ON/OFF SW4 voltage circuit ON/OFF GND Figure 1 2