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2022-09-24 23:32:00
ADM8828 - Switched Capacitor Voltage Inverter with Shutdown
Features Inverted Input Voltage
99% voltage conversion efficiency
25 mA output current shutdown function requires only two capacitors
1 MF capacitor
18 V output resistance
+1.5 V to +5.5 V input range
600mA quiescent current
20 nA Shutdown Current (ADM8828)
Application Handheld Instruments
LCD Panel Cell Phone Handheld Computer Remote Data Acquisition Operational Amplifier Power Supply
General Instructions
The ADM8828/ADM8829 is a charge pump voltage source inverter which can be used to generate a negative supply input from the positive side. The input voltage range from +1.5 V to +5.5 V can be reversed to a negative -1.5 V to -5.5 V output supply. This inverting scheme is ideal for generating a single negative voltage rail for power supply systems. Only two small external capacitors are required for the charge pump. Efficiencies greater than 99% are achievable with an output current of 25 mA. The ADM8828 also features a low-power shutdown (SHDN) pin. This can be used to disable the device, reducing the quiescent current to 20 nA. The ADM8828/ADM8829 are available in a 6-pin SOT-23 package.