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AAT3110IGU-33-T1 Datasheet(PDF) 11 Page - Advanced Analogic Technologies |
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AAT3110IGU-33-T1 Datasheet(HTML) 11 Page - Advanced Analogic Technologies |
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11 / 18 page  AAT3110 MicroPower™ Regulated Charge Pump 3110.2001.9.0.92 11 Functional Description Operation (Refer to block diagram) The AAT3110 uses a switched capacitor charge pump to boost an input voltage to a regulated output voltage. Regulation is achieved by sensing the charge pump output voltage through an internal resistor divider network. A switched doubling circuit is enabled when the divided output drops below a preset trip point controlled by an internal comparator. The charge pump switch cycling enables four inter- nal switches at two non-overlapping phases. During the first phase, switches S1 and S4 are switched on (short) and switches S2 and S3 are off (open). The flying capacitor CFLY is charged to a level approxi- mately equal to input voltage VIN. On the second phase, switches S1 and S4 are turned off (open), S2 and S3 are turned on (short). The low side of the fly- ing capacitor CFLY is connected to GND during the first phase. During the second phase, the flying capacitor CFLY is switched so that the low side is connected to VIN. The voltage at the high side of the flying capacitor CFLY is bootstrapped to 2×VIN and connected to output through a switch. For each cycle phase, charge from input node VIN is trans- ported from a lower voltage to a higher voltage. This cycle repeats itself until the output node voltage is high enough to exceed the preset input threshold of the control comparator. When the output voltage exceeds the internal trip point level, the switching cycle stops and the charge pump circuit is tem- porarily placed in an idle state. When idle, the AAT3110 has a quiescent current of 13µA or less. The closed loop feed back system containing the voltage sense circuit and control comparator allows the AAT3110 to provide a regulated output voltage to the limits of the input voltage and output load cur- rent. The switching signal, which drives the charge pump is created by an integrated oscillator within the control circuit block. The free running charge pump switching frequency is approximately 750kHz. The switching frequency under an active load is a func- tion of VIN, VOUT, COUT and IOUT. For each phase of the switching cycle, the charge transported from VIN to VOUT can be approximated by the following formula: VPHASE ≈ CFLY×(2×VIN-VOUT) The relative average current that the charge pump can supply to the output may be approximated by the following expression: IOUT(AVG) α CFLY×(2×VIN-VOUT)×FSW The AAT3110 has complete output short circuit and thermal protection to safeguard the device under extreme operating conditions. An internal thermal protection circuit senses die temperature and will shut down the device if the internal junction temper- ature exceeds approximately 145°C. The charge pump will remain disabled until the fault condition is relieved. Functional Block Diagram + - V REF CONTROL SHDN VIN C- C+ VOUT GND S1 S3 S2 S4 |
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Similar Description - AAT3110IGU-33-T1 |
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