For automotive off-board sensors and low-current off-board modules, the power supply is through a long cable from the main board. In such cases, protection is required in the power devices for the off-board loads to prevent the onboard components from damage during a short to GND or short to battery caused by a broken cable. Off-board sensors require a power supply as consistent as that for onboard components to secure high accuracy of data acquisition.
The TPS7B4254-Q1 device is designed for automotive applications with a 45-V load dump. The device can either be used as one tracking low-dropout (LDO) regulator or as a voltage tracker to build one closed power loop for off-board sensors with an onboard main supply. The output of the device is accurately regulated by a reference voltage at the ADJ pin.
To provide an accurate power supply to the off-board modules, the device offers a 4-mV ultralow tracking tolerance between the ADJ and FB pins across temperature. The back-to-back PMOS topology eliminates the need for an external diode under a reverse-polarity condition. The TPS7B4254-Q1 device also includes thermal shutdown, inductive clamp, overload, and short-to-battery protection to prevent damage to onboard components during extreme conditions.
Part number | Order | Output options | Iout (Max) (A) | Vin (Max) (V) | Vin (Min) (V) | Vout (Max) (V) | Vout (Min) (V) | Package Group | Features | Regulated outputs (#) | Operating temperature range (C) | Thermal resistance θJA (°C/W) | Approx. price (US$) | Rating | PSRR @ 100 KHz (dB) | Accuracy (%) | Dropout voltage (Vdo) (Typ) (mV) | Iq (Typ) (mA) | Package size: mm2:W x L (PKG) |
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TPS7B4254-Q1 |
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Adjustable Output
Tracking Output |
0.15 | 40 | 4 | 40 | 2 | SO PowerPAD | 8 |
Reverse Current Protection
Reverse Voltage Protection |
1 | -40 to 125 | 45 | 0.70 | 1ku | Automotive | 43 | 160 | 0.06 | 8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8) | |
TPS7B4250-Q1 |
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Adjustable Output
Tracking Output |
0.05 | 40 | 4 | 18 | 1.5 | SOT-23 | 5 |
Reverse Current Protection
Reverse Voltage Protection |
1 | -40 to 125 | 172 | 0.40 | 1ku | Automotive | 60 | 250 | 0.04 | 5SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 5) | |
TPS7B4253-Q1 |
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Adjustable Output
Tracking Output |
0.3 | 40 | 4 | 40 | 1.5 |
HTSSOP | 20
SO PowerPAD | 8 |
Enable
Reverse Current Protection Reverse Voltage Protection |
1 | -40 to 125 | 45 | 0.85 | 1ku | Automotive | 60 | 350 | 0.04 |
20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)
8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8) |
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TPS7B7701-Q1 |
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Adjustable Output | 0.3 | 40 | 4 | 20 | 1.5 | HTSSOP | 16 |
Adjustable Current Limit
Current Sense Enable Power Good Reverse Current Protection Reverse Voltage Protection |
1 | -40 to 125 | 40 | 1.00 | 1ku | Automotive | 60 | 2 | 350 | 0.6 |