TPS65321-Q1 Step-Down Converter

By Texas Instruments 54

TPS65321-Q1 Step-Down Converter

Texas Instruments' 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.

Features
  • 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)
  • 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
  • Overcurrent protection for both regulators
  • Overtemperature protection
  • 14-pin HTSSOP package with PowerPAD integrated circuit package

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