• Qualified for Automotive Applications
• AEC-Q100 Qualified with the Following Results:
  • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
  • Device HBM ESD Classification Level 2
  • Device CDM ESD Classification Level C4B
• One High-VIN Step-Down DC-DC Converter
  • Input Range of 3.6-V to 36-V
  • 250-mΩ High-Side MOSFET
  • Maximum Load Current 3.2-A, Output Adjustable 1.1-V to 20-V
  • Adjustable Switch-Mode Frequency 100-kHz to 2.5-MHz
  • Synchronizes to External Clock
  • Maximum 140-μA Operating Quiescent Current
    • High Efficiency at Light Loads With Pulse-Skipping Eco-mode™ Control Scheme
  • Reset Output-Pin (Active Low, Open-Drain)
• One High-VIN Low-Dropout (LDO) Voltage Regulator
  • Input Range of 3-V to 36-V
  • 280-mA Current Capability With Typical 35-µA Operating Quiescent Current in No-Load Condition
  • Low-Dropout Voltage of 300-mV at IO = 200-mA (Typical)
• Overcurrent Protection for Both Regulators
• Overtemperature Protection
• 14-Pin HTSSOP Package With PowerPAD™ Integrated Circuit Package

• Automotive Infotainment and Cluster
• Advanced Driver Assistance System (ADAS)
• Automotive Telematics, eCall
• 12-V and 24-V Industrial and Commercial Low Power System

The TPS65321-Q1 device is a combination of a high-VIN DC-DC step-down converter, referred to as the buck regulator, with an adjustable switch-mode frequency from 100-kHz to 2.5-MHz, and a high-VIN 280-mA low-dropout (LDO) regulator. The input range is 3.6-V to 36-V for the buck regulator, and 3-V to 36-V for the LDO regulator. The buck regulator has an integrated high-side MOSFET and an active-low, open-drain power-good output-pin (nRST). The LDO regulator also has an integrated MOSFET and features a low-input supply current of 35-μA typical in no-load condition. The low-voltage tracking feature enables the TPS65321-Q1 device to track the input supply during cold-crank conditions.

The buck regulator provides a flexible design to fit system needs. The external loop compensation circuit allows for optimization of the converter response for the appropriate operating conditions. A low-ripple pulse-skip mode reduces the no-load input-supply current to maximum 140-μA.

The device has built-in protection features such as soft start, current-limit, thermal sensing, and shutdown because of excessive power dissipation. Furthermore, the device has an internal undervoltage-lockout (UVLO) function that turns off the device when the supply voltage is too low.