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 to
36 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.

• 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

• Regulated outputs (#)
• 2
• Vin (Min) (V)
• 3.6
• Vin (Max) (V)
• 36
• Iout (Max) (A)
• 3.2
• Rating
• Automotive
• LDO
• 1
• Iq (Typ) (mA)
• 0.145
• Features
• Eco-mode, Enable, Over Current Protection, Power Good, Thermal Shutdown, UVLO Fixed
• Processor name
• Generic
• Processor supplier
• Generic
• Shutdown current (ISD) (Typ) (uA)
• 2
• Configurability
• Hardware configurable

TPS65321A-Q1的完整型号有：TPS65321AQPWPRQ1，以下是这些产品的关键参数及官网采购报价：

TPS65321AQPWPRQ1，工作温度：-40 to 125，封装：HTSSOP (PWP)-14，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：NIPDAU，TI官网TPS65321AQPWPRQ1的批量USD价格：.9（1000+）

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德州仪器 (TI) TPS65321EVM 评估模块 (EVM) 能帮助设计人员评估 TPS65321 开关模式电源 – 多路输出电压稳压器的功能和性能。

TPS65321-Q1 PSpice Transient Model (Rev. A)

TIDA-00677 使用由上游降压转换器 (TPS65321-Q1) 供电的 TPS92630-Q1 线性 LED 驱动器展示了汽车 LED 尾灯应用（尾灯/制动灯、转向灯和倒车灯），该转换器由汽车电池电压通过智能电池反向二极管直接供电。该设计还根据 CISPR25 和 ISO 7637-2 经过了 EMI/EMC 辐射和脉冲测试。可在用户指南中找到有关潜在成本节约和高效率（功率耗散和系统热性能）的更多信息。有关由升压转换器驱动的类似设计，请参阅 TIDA-00678。有关通过汽车电池直接驱动的类似设计，请参阅 TIDA-00679。