TPS7B4260-Q1 Automotive, 300mA, 40V, Voltage-Tracking LDO With 6mV Tracking Tolerance

1 Features

AEC-Q100 qualified for automotive applications:
- Temperature grade 1: –40°C to +125°C, T_A
- Junction temperature: –40°C to +150°C, T_J
Wide input voltage range:
- Absolute maximum range: –40V to +45V
- Operating range: 3.3V to 40V
Output voltage:
- Wide operating range: 2V to 40V
- Output voltage flexibility: Scale V_OUT to values higher or lower than the reference using external resistors in a voltage divider configuration
Maximum output current: 300mA
Very tight output-tracking tolerance: 6mV (max)
Low dropout voltage: 330mV at 200mA
Combined enable and reference functionalities
Low quiescent current at light load: 60μA
Stable over a wide range of ceramic output capacitor values:
- C_OUT range: 1μF to 100μF
- ESR range: 1mΩ to 2Ω
Integrated protection features:
- Reverse current protection
- Reverse polarity protection
- Overtemperature protection
- Protection against output short-circuit to ground and supply
Available in the HSOIC (DDA) low thermal resistance (R_θJA = 48°C/W) 8-pin package

2 Applications

3 Description

The TPS7B4260-Q1 is a monolithic, integrated, low-dropout (LDO) voltage tracker. The device is available in an 8-pin HSOIC package. The TPS7B4260-Q1 is designed to reliably provide power to off-board sensors with a wire harness, even in harsh automotive environments. In such severe operating conditions, the cables in the harness are potentially exposed to various fault conditions, increasing risk of failure. Such conditions include short to ground, short to battery, and overtemperature. The TPS7B4260-Q1 comes with integrated protection features against each of these fault conditions, as well as protection against reverse polarity. The device incorporates a topology containing two back-to-back P-channel metal-oxide semiconductor field-effect transistors (MOSFETs). This PMOS topology eliminates the need for an external diode that is otherwise required to prevent the flow of reverse current. The high 300mA current rating of the device potentially allows a single tracker to power multiple off-board sensors simultaneously. The device is designed to handle a 45V (absolute maximum) input voltage and survive the automotive load dump transient conditions.

Package Information

PART NUMBER	PACKAGE⁽¹⁾	PACKAGE SIZE⁽²⁾
TPS7B4260-Q1	DDA (HSOIC, 8)	6mm × 4.9mm

(1) For more information, see the Mechanical, Packaging, and Orderable Information.

(2) The package size (length × width) is a nominal value and includes pins, where applicable.

Typical Application

The TPS7B4260-Q1 provides a protective buffer for the ADC and MCU against fault conditions, while securely transferring power to the off-board sensors. A reference voltage applied at the adjustable input pin (ADJ/EN) is tracked with a very tight 6mV (max) tolerance at the FB pin. This tolerance holds true for all variations across the specified line, load, and temperature values. For ratiometric sensors whose output is sampled by the ADC, this tight tracking tolerance is particularly benficial. This tolerance makes sure that the error between the ADC full-scale reference and the sensor power-supply voltage is minimal. The ratiometricity of the sensor measurement is thereby maintained.

Output voltage becomes equal to the voltage at the ADJ/EN pin (± the tracking tolerance) by tying the FB pin directly to the OUT pin. If the ADC full-scale reference voltage equals the sensor supply voltage, connect the reference voltage directly to the ADJ/EN pin. If the sensor supply is lower than the reference, use a resistive divider at the ADJ/EN pin. This divider helps scale down the reference voltage to match the sensor supply voltage. If the sensor supply is higher than the reference, use a resistive divider between the FB and OUT pins. This divider helps scale up the ADC full-scale reference voltage and match the sensor supply voltage.

By setting the ADJ/EN input pin low, the TPS7B4260-Q1 switches to standby mode. In this mode, the quiescent current consumption of the LDO reduces to less than 3.8μA.

4 Pin Configuration and Functions

TPS7B4260-Q1 DDA Package,8-Pin HSOIC(Top View)

Figure 4-1 DDA Package,8-Pin HSOIC(Top View)

Table 4-1 Pin Functions

PIN		TYPE	DESCRIPTION
NAME	DDA	TYPE	DESCRIPTION
ADJ/EN	5	I	Adjustable/enable input pin. Connect the external reference voltage to this pin. This pin connects to the inverting input of the error amplifier internally. A low signal below V_IL disables the device, and a high signal above V_IH enables the device. Connect the voltage reference directly, or with a voltage divider to attain output voltages lower than the reference. To compensate for line influences, place a 0.1μF capacitor close to this pin.
DNC	2	—	Do not connect a voltage source to this pin. Either leave the pin floating or connect to GND to improve thermal performance.
FB	4	I	Feedback pin. This pin is connected to the noninverting input of the error amplifier internally and controls the output voltage. For output voltages equal to or less than the external reference voltage, connect this pin directly to the output pin. To attain output voltage values higher than the reference, use a voltage divider with external feedback resistors.
GND	6, 3	G	GND pin. Connect this pin to a low impedance path to ground.
IN	8	I	Input power-supply voltage pin. For best transient response and to minimize input impedance, use the recommended value or larger ceramic capacitor from IN to GND. See the Recommended Operating Conditions table. Place the input capacitor as close to the input pin of the device as possible to compensate for line influences. See the Input and Output Capacitor Selection section for more details.
NC	7	—	Not internally connected. For best thermal performance, connect these pins to GND.
OUT	1	O	Regulated output voltage pin. A capacitor is required from OUT to GND for stability. Select a ceramic capacitor within the range of C_OUT values provided in the Recommended Operating Conditions table. Place this capacitor as close to output of the device as possible. See the Input and Output Capacitor Selection section for more details.
Thermal Pad	Pad		Thermal pad. Connect the pad to GND for best possible thermal performance.

5 Specifications

5.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)⁽¹⁾

		MIN	MAX	UNIT
V_IN	Unregulated input pin voltage	–40	45	V
V_OUT	Regulated output pin voltage	–5	45	V
V_IN - V_OUT	Input-Output Differential	-45	45	V
V_FB	Feedback pin voltage	–5	45	V
V_ADJ/EN	Adjustable reference and enable pin voltage	–40	45	V
T_J	Operating junction temperature	–40	150	°C
T_stg	Storage temperature	–65	150	°C

(1) Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute Maximum Ratings do not imply functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may effect the device reliability, functionality, performance, and shorten the device lifetime.