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TPS60200 Datasheet(PDF) 4 Page - Texas Instruments |
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TPS60200 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 24 page TPS60200, TPS60201, TPS60202, TPS60203 REGULATED 3.3 V, 100-mA LOW-RIPPLE CHARGE PUMP LOW POWER DC/DC CONVERTERS SLVS274 – MARCH 2000 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION C1+ 4 Positive terminal of the flying capacitor C1 C1– 3 Negative terminal of the flying capacitor C1 C2+ 6 Positive terminal of the flying capacitor C2 C2– 8 Negative terminal of the flying capacitor C2 EN 9 I Device-enable input. Three operating modes can be programmed with the EN pin. – EN = Low disables the device. Output and input are isolated in the shutdown mode and the output capacitor is automatically discharged. – EN = High lets the device run from the internal oscillator. – If an external clock signal is applied to the EN pin, the device is in Sync–Mode and runs synchronized at the frequency of the external clock signal. GND 2 Ground IN 7 I Supply input. Bypass IN to GND with a capacitor of the same size as Co. LBI/GND 1 I Low-battery detector input for TPS60200 and TPS60202. A low-battery warning is generated at the LBO pin when the voltage on LBI drops below the threshold of 1.18 V. Connect LBI to GND if the low-battery detector function is not used. For the devices TPS60201 and TPS60203, this pin has to be connected to ground (GND pin). LBO/PG 10 O Open-drain low-battery detector output for TPS60200 and TPS60202. This pin is pulled low if the voltage on LBI drops below the threshold of 1.18 V. A pullup resistor should be connected between LBO and OUT or any other logic supply rail that is lower than 3.6 V. Open-drain power-good detector output for TPS60201 and TPS60203. As soon as the voltage on OUT reaches about 90% of it is nominal value this pin goes active high. A pullup resistor should be connected between PG and OUT or any other logic supply rail that is lower than 3.6 V. OUT 5 O Regulated 3.3-V power output. Bypass OUT to GND with the output filter capacitor Co. detailed description operating principle The TPS6020x charge pumps provide a regulated 3.3-V output from a 1.8-V to 3.6-V input. They deliver up to 100-mA load current while maintaining the output at 3.3 V ± 4%. Designed specifically for space critical battery powered applications, the complete converter requires only four external capacitors. The device is using the push-pull topology to achieve lowest output voltage ripple. The converter is also optimized for smallest board space. It makes use of small sized capacitors, with the highest output current rating per output capacitance and package size. The TPS6020x circuits consist of an oscillator, a 1.18-V voltage reference, an internal resistive feedback circuit, an error amplifier, two charge pump power stages with high current MOSFET switches, a shutdown/start-up circuit, a control circuit, and an auto-discharge transistor (see functional block diagrams). push-pull operating mode The two single-ended charge pump power stages operate in the so-called push-pull operating mode, i.e. they operate with a 180 °C phase shift. Each single-ended charge pump transfers charge into its transfer capacitor (C1 or C2) in one half of the period. During the other half of the period (transfer phase), the transfer capacitor is placed in series with the input to transfer its charge to Co. While one single-ended charge pump is in the charge phase, the other one is in the transfer phase. This operation assures an almost constant output current which ensures a low output ripple. If the clock were to run continuously, this process would eventually generate an output voltage equal to two times the input voltage (hence the name voltage doubler). In order to provide a regulated fixed output voltage of 3.3 V, the TPS6020x devices use either pulse-skip or constant-frequency linear-regulation control mode. The mode is automatically selected based on the output current. If the load current is below the LinSkip current threshold, it switches into the power-saving pulse-skip mode to boost efficiency at low output power. |
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