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TPS62051DGSRG4 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS62051DGSRG4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 30 page EN VIN ON OFF 0.3 µA, min R >1.3 V/0.3 µA TPS6205x 5 V EN VIN VIN Vt = 0.7 V 0 µA for VEN < 0.6 V Typically 0.3 µA to 5 µAfor VEN < 4 V Enable to Internal Circuitry TPS62050, TPS62051, TPS62052, TPS62054, TPS62056 SLVS432F – SEPTEMBER 2002 – REVISED JUNE 2015 www.ti.com 9.3 Feature Description 9.3.1 Enable and Overtemperature Protection A logic low on EN forces the TPS6205x devices into shutdown. In shutdown, the power switch, drivers, voltage reference, oscillator, and all other functions are turned off. The supply current is reduced to less than 2 µA in the shutdown mode. When the device is in thermal shutdown, the bandgap is forced to stay on even if the device is set into shutdown by pulling EN to GND. As soon as the temperature drops below the threshold, the device automatically starts again. If an output voltage is present when the device is disabled, which could be an external voltage source or super cap, the reverse leakage current is specified under Electrical Characteristics. Pulling the enable pin high starts up the TPS6205x devices with the soft-start as described in Soft-Start. If the EN pin is connected to any voltage other than VI or GND, an increased leakage current of typically 10 µA and up to 20 µA can occur. Figure 2. Internal Circuit of the ENABLE Pin The EN pin can be used in a pushbutton configuration as shown in Figure 3. The external resistor to GND must be capable of sinking 0.3 µA with a minimum voltage drop of 1.3 V to keep the system enabled when both switches are open. When the ON-button is pressed, the device is enabled and the current through the external resistor keeps the voltage level high to ensure that the device stays on when the ON-button is released. When the OFF-button is pressed, the device is switched off and the current through the external resistor is zero. The device therefore stays off even when the OFF-button is released. Figure 3. Pushbutton Configuration for the EN-Pin 9.3.2 Low-Battery Detector (Standard Version) The low-battery output (LBO) is an open-drain type which goes low when the voltage at the low battery input (LBI) falls below the trip point of 1.21 V ±1.5%. The voltage at which the low-battery warning is issued is adjusted with a resistive divider as shown in Figure 5. TI recommends the sum of the resistors R1 and R2 to be in the 100-k Ω to 1-MΩ range for high-efficiency at low output current. An external pullup resistor at LBO can either be connected to OUT, or any other voltage rail in the voltage range of 0 V to 6 V. During start-up, the LBO output signal is invalid for the first 500 µs. LBO is high impedance when the device is disabled. If the low-battery comparator function is not used, connect LBI to ground. The low-battery detector is disabled when the device is disabled. Leave the LBO pin unconnected, or connect to GND when not used. 8 Submit Documentation Feedback Copyright © 2002–2015, Texas Instruments Incorporated Product Folder Links: TPS62050 TPS62051 TPS62052 TPS62054 TPS62056 |
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