描述 Description

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.

特性 Features

? 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