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TPS7B4250-Q1 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS7B4250-Q1 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 23 page VOUT VIN TPS7B4250-Q1 Vreg GND 2.2 µF 1 µF ADJ/EN 7-V VI 5-V Vref Switch Vbat Automotive Battery, 14 V (typically) VOUT VIN TPS7B4250-Q1 Vreg GND 2.2 µF 1 µF ADJ/EN Vbat 5-V Vref Automotive Battery, 14 V (typically) Switch TPS7B4250-Q1 SLVSCA0B – OCTOBER 2013 – REVISED JULY 2015 www.ti.com Feature Description (continued) 7.3.3 Thermal Protection Thermal protection disables the output when the junction temperature rises to approximately 175°C which allows the device to cool. When the junction temperature cools to approximately 150°C, the output circuitry enables. Based on power dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may cycle on and off. This cycling limits the dissipation of the regulator and protects it from damage as a result of overheating. The internal protection circuitry of the TPS7B4250-Q1 device has been designed to protect against overload conditions. The circuitry was not intended to replace proper heat-sinking. Continuously running the TPS7B4250- Q1 device into thermal shutdown degrades device reliability. 7.3.4 VOUT Short to Battery The TPS7B4250-Q1 device survives a short to battery when the output is shorted to the battery as shown in Figure 13. No damage occurs to the device. A short to the battery can also occur when the device is powered by an isolated supply at a lower voltage as shown in Figure 14. In this case the TPS7B4250-Q1 supply input voltage is set at 7 V when a short to battery (14 V typical) occurs on VOUT which typically runs at 5 V. The continuous reverse current flows out through VIN is less than 5 µA. Figure 13. Output-Voltage Short to Battery Figure 14. Output Voltage Higher than Input 7.3.5 Tracking Regulator with ENABLE Circuit By pulling the reference voltage of the device below 0.8 V, the IC disables and enters a sleep state where the device draws 7.5 µA (typical) from the power supply. In a real application, the reference voltage is generally sourced from another LDO voltage rail. A case where the device must be disabled without a shutdown of the reference voltage can occur. In such case, the device can be configured as shown in Figure 15. The TPS7A6650-Q1 device is a 150-mA LDO with ultra-low quiescent current that is used as a reference voltage to the TPS7B4250-Q1 device and also as a power supply to the ADC. In a configuration as shown in Figure 15, the status of the device is controlled by an MCU I/O. 10 Submit Documentation Feedback Copyright © 2013–2015, Texas Instruments Incorporated Product Folder Links: TPS7B4250-Q1 |
Similar Part No. - TPS7B4250-Q1_15 |
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Similar Description - TPS7B4250-Q1_15 |
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