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| Parameters |
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The TPS65321A-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 to36 V for the LDO regulator. The buck regulator has an integrated high-side MOSFET with an active-low, open-drain power-good output-pin (nRST). The LDO regulator features a low-input supply current of 45-µA typical in no-load, also has an integrated MOSFET. Low-voltage tracking feature enables TPS65321A-Q1 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 due to 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.
characteristic
• 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 Switching Frequency 100 kHz to 2.5 MHz
• Synchronizes to External Clock
• High Efficiency at Light Loads With Pulse-Skipping Eco-mode™ Control Scheme
• Maximum 140-µA Operating Quiescent Current
• 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 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
