Texas Instruments TPS7B7802-Q1 Dual-Channel LDO Regulator
Texas Instruments TPS7B7802-Q1 Dual-Channel LDO Regulator is a monolithic high-voltage low-dropout (LDO) regulator with an integrated ADC and I2C interface. The device has a wide input-voltage operating range and is designed to protect against a 45V input-voltage load-dump scenario. This device is an excellent choice for powering remotely located LNAs (associated with AM/FM/GNSS antennas), microphone and camera modules over coax cables. In harsh automotive environments, coax cables are potentially exposed to various fault conditions, increasing the risk of failure. Such conditions include short-to-ground, short-to-battery, and overtemperature.
The TPS7B7802-Q1 comes with integrated protection against each of these fault conditions, as well as reverse-polarity protection. The device incorporates a topology comprising two back-to-back P-channel metal-oxide-semiconductor field-effect transistors (MOSFETs). This PMOS topology eliminates the need for an external diode, which is otherwise required to prevent reverse current. Each channel can provide up to 300mA of output current and an adjustable output voltage from 2V to 40V.
This device can uniquely identify and diagnose several fault conditions. This diagnosis information can be inferred from a register via I2C communication and the error pin. The integrated 10-bit ADC allows the user to continuously monitor the input and output voltages, junction temperature, and load current. The device features high-accuracy current-sense circuitry across the current range (≤ ±12.5% for 1mA to 23.5mA and < ±9.5% for > 75mA) for both channels. This feature allows the device to precisely detect and distinguish between open, normal, and short-circuit conditions without further calibration. Each channel also offers an adjustable current limit that can be configured via I2C.
The Texas Instruments TPS7B7802-Q1 operates over -40°C to +125°C ambient temperature range and is available in a 4.0mm × 4.0mm, 20-pin WQFN (wettable flank) (RTJ-WF) thermally conductive package.
Features
- AEC-Q100 qualified for automotive applications
- Temperature grade 1 of -40℃ to +125℃, TA
- Junction temperature of -40℃ to +150℃, TJ
- Wide input voltage range
- -40V to +45V absolute maximum range
- 4.5V to 40V operating range
- Output voltage:
- A wide range of output voltage can be set using external resistors (2V to 40V)
- Output voltage range programmed using I2C without external resistors (2V to 27.4V in 100mV steps)
- Power switch mode can be set using I2C (internal FB mode) or by tying FB to GND (external FB resistor mode)
- Supports up to 300mA of load current per channel
- High accuracy current sense (≤ ±12.5%) to detect low load currents (≤ 25mA) without further calibration
- Adjustable current limit via I2C programming
- 315mV (max) at 100mA low dropout voltage
- Stable over a wide range of ceramic output capacitor values
- 4.7µF to 100µF COUT range
- 1mΩ to 500mΩ ESR range
- Integrated protection features
- Reverse current protection
- Reverse polarity protection
- Over temperature protection
- Protection against output short-circuit to ground and battery
- Integrated diagnostic and monitoring features using the I2C interface
- Input and output voltage monitoring
- Load current monitoring
- Junction temperature monitoring
- Open circuit detection
- Output under-voltage and over-voltage detection
Applications
- Powering low-noise amplifiers in an automotive head unit
- Powering camera modules in a surround view system
- Microphone power
Typical Application
