TPS53511 1.5A Step-Down Regulator with Integrated MOSFETs |

TPS53511 (ACTIVE) 1.5A Step-Down Regulator with Integrated MOSFETs



The TPS53511 is an adaptive on-time D-CAP2™ mode synchronous buck converter. The device is suitable for points-of-load (POL) in computing power systems, and provides a cost-effective, low component count, low standby current solution. The main control loop for the TPS53511 uses the D-CAP2™ mode control providing a fast transient response with no external components. The adaptive on-time control supports seamless operation between PWM mode during heavy load conditions and reduced frequency operation during light load conditions for high efficiency.

The TPS53511 includes a proprietary circuit that enables the device to adapt to both low equivalent series resistance (ESR) output capacitors, such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors. The device operates from 4.5-V to 18-V supply input, and from 2-V to 18-V input power supply voltage. The device features an adjustable slow start time and a power good function. It also supports pre-biased soft start. The TPS53511 is available in the 16-pin QFN


  • Continuous 1.5-A Output Current
  • 4.5-V to 18-V Supply Voltage Range
  • 2-V to 18-V Conversion Voltage Range
  • DCAP2 Mode Control Enables Fast Transient Response
  • Low Output Ripple and Support all MLCC Output Capacitor
  • Skip Mode for Light Load Control
  • Highly Efficient Integrated FETs Optimized for Lower Duty Cycle Applications
  • High Efficiency, Less than 10-µA Supply Current at Shutdown
  • Adjustable Soft-Start Time
  • Support Pre-Biased Soft Start
  • 700-kHz Switching Frequency
  • Cycle-By-Cycle Overcurrent Limit
  • Open Drain Power Good Indication
  • Internal Bootstrap Switch
  • Small 3 mm × 3 mm, 16-Pin QFN (RGT) Package


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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (Max) (A) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Control mode Duty cycle (Max) (%) Operating temperature range (C) Rating Package Group Type Package size: mm2:W x L (PKG)
TPS53511 Order now 4.5     18     0.75     5     1.5     1     700     700     1.3     Enable
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification    
D-CAP2     95     -40 to 85     Catalog     VQFN | 16     Converter     16VQFN: 9 mm2: 3 x 3 (VQFN | 16)