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TPS60503 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS60503 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 20 page TPS60500, TPS60501 TPS60502, TPS60503 SLVS391B – OCTOBER 2001 – REVISED FEBRUARY 2002 10 www.ti.com PRINCIPLES OF OPERATION The TPS6050x devices use fractional conversion to achieve high efficiency over a wide input and output voltage range. Depending on the input to output voltage ratio and output current, internal circuitry switches between an LDO mode, a 2/3x mode, a 0.5x mode, and a 1/3x mode. LDO conversion mode In the LDO mode, the flying capacitors are no longer used for transferring energy. The switches 1, 2, 5, and 6 are closed and connect the input directly with the output. This mode is automatically selected if the input to output voltage ratio does not allow the use of another conversion mode with higher efficiency. In LDO mode, the regulation is done by switching off MOSFET 2 and 6 until the output current reaches the linear-skip current (150 mA typ). At a higher output current, the output voltage is regulated by controlling the resistance of the switch. The minimum input to output voltage difference required for regulation is 1 V. C1F C2F SW1 SW2 SW3 SW4 SW9 SW5 SW6 SW7 SW8 ++ + VIN OUT Co Figure 22. LDO Conversion Mode 2/3x conversion mode In the first cycle, the two flying capacitors are connected in parallel and are charged up in series with the output capacitor. In the second cycle, the flying capacitors are connected in series. This mode provides higher efficiency than the LDO mode because the current into VIN is only 2/3 of the output current. The mode is automatically selected if the input voltage is higher than 3/2 of the selected output voltage. C1F C2F SW1 SW2 SW3 SW4 SW9 SW5 SW6 SW7 SW8 ++ + VIN OUT Co SW1 SW2 SW3 SW4 SW9 SW5 SW6 SW7 SW8 ++ + VIN OUT Co C1F C2F Phase 1: Charging of Flying Caps Phase 2: Discharging of Flying Caps Figure 23. 2/3x Conversion Mode |
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