The TPS53321 device provides a fully integrated 3-V to 5-V V_IN integrated synchronous FET converter solution with 16 total components in 200 mm² of PCB area. Due to the low ON-resistance and TI’s Proprietary SmoothPWM™ skip mode of operation, it enables 96% peak efficiency and over 90% efficiency at loads as light as 100 mA. It requires only two 22-µF ceramic output capacitors for a power dense 5-A solution.

The TPS53321 features a 1.1-MHz switching frequency, skip mode operation support, prebias start-up, internal soft start, output soft discharge, internal VBST switch, power good, EN/input UVLO, overcurrent, overvoltage, undervoltage, and overtemperature protections, and all ceramic output capacitor support. It supports supply voltage from 2.9 V to 3.5 V and conversion voltage from 2.9 V to 6 V. The output voltage is adjustable from 0.6 V to 0.84 V × V_IN.

The TPS53321 is available in the 3 mm × 3 mm 16-pin QFN package (Green RoHs compliant and Pb free) and operates between –40°C and 85°C.

• 96% Maximum Efficiency
• Continuous 5-A Output Current
• Supports All MLCC Output Capacitor
• SmoothPWM Auto-Skip Eco-Mode for Light-Load Efficiency
• Optimized Efficiency at Light and Heavy Loads
• Voltage Mode Control
• Supports Master-Slave Interleaved Operation
• Synchronization up to ±20% of Nominal Frequency
• Conversion Voltage Range Between 2.9 V and 6 V
• Soft-Stop Output Discharge During Disable
• Adjustable Output Voltage Ranging Between 0.6 V and 0.84 V × VIN
• Overcurrent, Overvoltage, and Overtemperature Protection
• Small 3 mm × 3 mm, 16-Pin QFN Package
• Open-Drain Power Good Indication
• Internal Boot Strap Switch
• Low RDS(on), 24 mΩ With 3.3-V Input and 19-mΩ With 5-V Input
• Supports Prebias Start-Up

• Vin (Min) (V)
• 2.9
• Vin (Max) (V)
• 6
• Vout (Min) (V)
• 0.6
• Vout (Max) (V)
• 4.2
• Iout (Max) (A)
• 5
• Iq (Typ) (uA)
• 320
• Switching frequency (Min) (kHz)
• 1100
• Switching frequency (Max) (kHz)
• 1100
• Features
• Enable, Frequency Synchronization, Light Load Efficiency, Output Discharge, Power Good, Pre-Bias Start-Up, Synchronous Rectification
• Rating
• Catalog
• Regulated outputs (#)
• 1
• Control mode
• Voltage Mode
• Duty cycle (Max) (%)
• 99

TPS53321的完整型号有：TPS53321RGTR、TPS53321RGTT，以下是这些产品的关键参数及官网采购报价：

TPS53321RGTR，工作温度：-40 to 85，封装：VQFN (RGT)-16，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS53321RGTR的批量USD价格：.924（1000+）

TPS53321RGTT，工作温度：-40 to 85，封装：VQFN (RGT)-16，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS53321RGTT的批量USD价格：1.109（1000+）

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