S-8821 Series
www.ablic.com © ABLIC Inc., 2002-2021
VOLTAGE REGULATION BOOST CHARGE PUMP DC-DC CONVERTER
Rev.5.2_00
T...
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...