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REG71055DDCRG4 Datasheet(PDF) 8 Page - Texas Instruments |
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REG71055DDCRG4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 32 page V IN Enable 3 5 4 6 1 V OUT 2 GND Thermal Control & REG710 C IN 2.2 F m C OUT 2.2 F m C PUMP 0.22 F m REG71050, REG71055, REG710 SBAS221H – DECEMBER 2001 – REVISED OCTOBER 2015 www.ti.com 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Shutdown Mode The EN pin enables the IC when pulled high and places it into energy-saving shutdown mode when pulled low. When in shutdown mode, the output is disconnected from the input and the quiescent current is reduced to 0.01 μA typical. This shutdown mode functionality is only valid when VIN is above the minimum recommended operating voltage. The EN pin cannot be left floating and must be actively terminated either high or low. 8.3.2 Protection The regulator includes thermal shutdown circuitry protecting the device from damage caused by overload conditions. The thermal protection circuitry disables the output when the junction temperature reaches approximately 160°C, allowing the device to cool. When the junction temperature cools to approximately 140°C, the output circuitry is automatically reenabled. Continuously operating the regulator into thermal shutdown can degrade reliability. The regulator also provides current limit to protect itself and the load. 8.4 Device Functional Modes 8.4.1 Peak Current Reduction In normal operation, the charging of the pump and the output capacitors usually leads to relatively high peak input currents which can be much higher than the average load current. The regulator incorporates circuitry to limit the input peak current, lowering the total EMI emission and lowering the output voltage ripple and the input current ripple. The Input capacitor (CIN) supplies most of the charge required by the input current peaks. 8.4.2 Efficiency The efficiency of the charge pump regulator varies with the output voltage version, the applied input voltage, the load current, and the internal operation mode of the device. The approximate efficiency is given by: 8 Submit Documentation Feedback Copyright © 2001–2015, Texas Instruments Incorporated Product Folder Links: REG71050 REG71055 REG710 |
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