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 2.9V to 6V, 5-A Step-Down Converter with Integrated MOSFETs


Package | PIN: RGT | 16
Temp: I (-40 to 85)
Carrier: Cut Tape
Qty Price
1-9 $3.61
10-24 $3.25
25-99 $3.02
100-249 $2.65
250-499 $2.48
500-749 $2.11
750-999 $1.78
1000+ $1.70


  • 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

Texas Instruments  TPS53321RGTR

The TPS53321 device provides a fully integrated 3-V to 5-V VIN 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 × VIN.

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.