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TPS7B4250-Q1 Datasheet(PDF) 10 Page - Texas Instruments

Part # TPS7B4250-Q1
Description  TPS7B4250-Q1 Low-Dropout Voltage-Tracking LDO
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS7B4250-Q1 Datasheet(HTML) 10 Page - Texas Instruments

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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
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Copyright © 2013–2015, Texas Instruments Incorporated
Product Folder Links: TPS7B4250-Q1


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