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TPS60503 Fiches technique(PDF) 9 Page - Texas Instruments |
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TPS60503 Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 20 page TPS60500, TPS60501 TPS60502, TPS60503 SLVS391B – OCTOBER 2001 – REVISED FEBRUARY 2002 9 www.ti.com PRINCIPLES OF OPERATION The TPS6050x charge pumps provide a regulated output voltage in the range of 0.8 V to 3.3 V from an input voltage of 1.8 V to 6.5 V. The devices use switched capacitor fractional conversion to achieve high efficiency over the entire input and output voltage range. Regulation is achieved by sensing the output voltage and enabling the internal switches as needed to maintain the selected output voltage. This skip-mode regulation is used over a load range from 0 mA to 150 mA. At a higher output current, the device works in a linear regulation mode. The TPS6050x circuits consist of an oscillator, a voltage reference, an internal resistive feedback circuit (fixed voltage version only), an error amplifier, two charge pump stages with MOSFET switches, a shutdown/start-up circuit, and a control circuit. short-circuit current limit and thermal protection When the output voltage is lower than 0.6 V, the output current is limited to 300 mA typically. The device also has a thermal protection which reduces the output current when the temperature of the chip exceeds 150 °C. The output current declines to 0 mA when the chip temperature rises to 160 °C. enable Driving EN high disables the converter. This disables all internal circuits, reducing input current to only 0.05 µA. Leakage current drawn from the output pin OUT is a maximum of 1 µA. The device exits shutdown once EN is set low (see start up procedure described below). The typical no-load start-up time is 80 µs. When the device is disabled, the load is isolated from the input, an important feature in battery-operated products because it extends the battery shelf life. start-up procedure The device is enabled when EN is set from logic high to logic low. The charge pump stages immediately start switching to transfer energy to the output. In start-up until the output voltage has reached 0.6 V, the input current is limited to 300 mA typically. power good detector The power good (PG) output is an open-drain output on all TPS6050x devices. The PG output pulls low when the output is out of regulation. When the output rises to within 97% of regulation, the power good output goes high. In shutdown, power good is pulled low. In normal operation, an external pullup resistor is typically used to connect the PG pin to VO or VI. If the PG output is not used, it should remain unconnected. td,f VO V(NOM) VIT PG 1 0 1 0 EN t t t td,r td,r Figure 21. Power Good Timing Diagram |
Numéro de pièce similaire - TPS60503 |
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Description similaire - TPS60503 |
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