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TPS60210DGSRG4 데이터시트(PDF) 4 Page - Texas Instruments |
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TPS60210DGSRG4 데이터시트(HTML) 4 Page - Texas Instruments |
4 / 26 page TPS60210, TPS60211, TPS60212, TPS60213 REGULATED 3.3 V, LOW RIPPLE CHARGE PUMP WITH ULTRALOW OPERATING CURRENT SLVS296 − JUNE 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 GND 2 Ground IN 7 I Supply input. Bypass IN to GND with a capacitor of a minimum of 2.2 µF. LBI/GND 1 I Low-battery detector input for TPS60210 and TPS60212. 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 or VBAT if the low-battery detector function is not used. For the devices TPS60211 and TPS60213, this pin is a ground (GND pin). LBO/PG 10 O Open-drain low-battery detector output for TPS60210 and TPS60212. 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 TPS60211 and TPS60213. As soon as the voltage on OUT reaches about 90% of its 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. SNOOZE 9 I Three operating modes can be programmed with the SNOOZE pin. − SNOOZE = Low programs the device in the snooze mode, enabling ultralow operating current while still maintaining the output voltage to within 3.3 V ±6%. − SNOOZE = High programs the device into normal operation mode where it runs from the internal oscillator. − If an external clock signal is applied to the SNOOZE pin, the charge pump operates synchronized to the frequency of the external clock signal. detailed description operating principle The TPS6021x charge pumps provide a regulated 3.3-V output from a 1.8-V to 3.6-V input. They deliver a minimum 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 the lowest output voltage ripple. The converter is also optimized for a very small board space. It makes use of small-sized capacitors, with the highest output current rating per output capacitance. The TPS6021x circuits consist of an oscillator, a 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, and a control circuit (see functional block diagrams). push-pull operating mode The two single-ended charge-pump power stages operate in the push-pull operating mode (i.e., they operate with a 180 °C phase shift). Each single-ended charge pump transfers a charge into its flying capacitor (C1 or C2) in one-half of the period. During the other half of the period (transfer phase), the flying capacitor is placed in series with the input to transfer its charge to the load and output capacitor (Co). While one single-ended charge pump is in the charge phase, the other one is in the transfer phase. This operation ensures that there is a continuous flow of charge to the load, hence the output capacitor no longer needs to buffer the load current for half of the switching cycle, avoiding the high, inherent output voltage ripple of conventional charge pumps. In order to provide a regulated output voltage of 3.3 V, the TPS6021x devices operate either in constant-frequency linear-regulation control mode or in pulse-skip mode. The mode is automatically selected based on the output current. If the load current is low, the controller switches into the power-saving pulse-skip mode to boost efficiency at low output power. |
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