1 Features

• 95.5% Maximum Efficiency
• Continuous 3-A Output Current
• Supports All MLCC Output Capacitor
• SmoothPWM™ Auto-Skip Eco-mode™ for Light-Load Efficiency
• Voltage Mode Control
• Supports Master-Slave Interleaved Operation
• Synchronization up to ±20% of Nominal Frequency
• Conversion Voltage Range From 2.9 V to 6 V
• Soft-Stop Output Discharge During Disable
• Adjustable Output Voltage Ranging From
  0.6 V to 0.84 V × V_IN
• Overcurrent, Overvoltage, and Overtemperature Protection
• Small, 3 mm × 3 mm, 16-Pin VQFN Package
• Open-Drain Power Good Indication
• Internal Boot Strap Switch
• Low R_DS(on), 24 mΩ With 3.3-V Input and 19-mΩ With 5-V Input
• Supports Prebias Start-Up Functionality

2 Applications

• 5-V Step-Down Rail
• 3.3-V Step-Down Rail

3 Description

The TPS53311 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 R_DS(on) and TI Proprietary SmoothPWM™ skip mode of operation, it enables 95.5% 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, 3-A solution.

The TPS53311 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, and output voltage is adjustable from 0.6 V to
0.84 V × V_IN.

The TPS53311 is available in the 3 mm × 3 mm
16-pin VQFN package (Green RoHs compliant and Pb free) and operates between –40°C and 85°C.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Circuit