TPS7B4254-Q1 Automotive 150mA 40V Voltage-Tracking LDO With 4mV Tracking Tolerance

Description

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.

Features

Qualified for Automotive Applications
AEC-Q100 Qualified With the Following Results
- Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
- Device HBM ESD Classification Level 3A
- Device CDM ESD Classification Level C6
–40-V to 45-V Wide Input-Voltage Range (Maximum)
Output-Voltage Adjust Range: 2 V to 40 V
150-mA Output Current Capability
Very Low Output-Tracking Tolerance, ±4 mV
160-mV Low-Dropout Voltage When I_OUT = 100 mA
Low Quiescent Current (I_(Q)):
- < 4 µA When ADJ = LOW
- 60 µA Typical at Light Load
Extremely Wide ESR Range
- 10-µF to 500-µF Ceramic Output Capacitor
- ESR Range from 1 mΩ to 20 Ω
Reverse Polarity Protection
Current-Limit and Thermal-Shutdown Protection
Output Short-Circuit-Proof to Ground and Supply
Inductive Clamp at OUT Pin
8-Pin SO PowerPAD Package With Exposed Thermal Pad

Thermal calculator

Estimate the LDO IC temperature at your design conditions:

Part number
		Range
Vin	V
Vout	V
Iout	A
Ambient temp	°C
Package option
Voltage option
PCB construction			Enhanced Thermal = single thermal spreading plane of 1 oz Cu Minimum Thermal = single thermal spreading plane of 1/2 oz Cu View the user guide for more details.
Error: LDO may be in dropout for the given conditions. Try increasing Vin, lowering Vout or lowering Iout.

Junction temperature vs. PCB copper coverage area

This calculator uses the PCB copper area to estimate the device junction temperature. See notes on usage and calculation method.

Parametrics

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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)	TI functional safety category	Approx. price (US$)	Rating	PSRR @ 100 KHz (dB)	Dropout voltage (Vdo) (Typ) (mV)	Iq (Typ) (mA)	Package size: mm2:W x L (PKG)
TPS7B4254-Q1	Order now	Adjustable Output Tracking Output	0.15	40	4	40	2	SO PowerPAD \| 8	Reverse Current Protection Reverse Voltage Protection	1	-40 to 125	45		0.62 \| 1ku	Automotive	43	160	0.06	8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD \| 8)
TPS7B4250-Q1	Order now	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	Functional safety-capable	0.35 \| 1ku	Automotive	60	250	0.04	5SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 \| 5)
TPS7B4253-Q1	Order now	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	Functional safety-capable	0.75 \| 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)
TPS7B7701-Q1	Order now	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	Functional safety-capable	0.88 \| 1ku

TPS7B4254-Q1 ACTIVE This product has been released to the market and is available for purchase. For some products, newer alternatives may be available. Automotive 150mA 40V Voltage-Tracking LDO With 4mV Tracking Tolerance