TPS51117 1.8V to 28V Input Sync Step Down Controller w/ DCAP™ Mode, Optimized for Light Load Efficiency | TI.com

TPS51117 (ACTIVE)

1.8V to 28V Input Sync Step Down Controller w/ DCAP™ Mode, Optimized for Light Load Efficiency

 

Description

The TPS51117 device is a cost-effective, synchronous buck controller for POL voltage regulation in notebook PC applications. The controller is dedicated for the operation of the Adaptive On-Time D-CAP mode. This mode provides ease-of-use, low external component count, and fast transient response. Auto-skip mode for high efficiency down to the milliampere load range, or PWM-only mode for low-noise operation is selectable.

The current-sensing scheme for positive overcurrent and negative overcurrent protection is loss-less low-side RDS(on) sensing plus temperature compensation. The device receives a 5-V (4.5 V to 5.5 V) supply from another regulator such as the TPS51120 or TPS51020. The conversion input can be either VBAT or a 5-V rail, ranging from 1.8 V to 28 V, and the output voltage range is from 0.75 V to 5.5 V.

The TPS51117 is available in a 14-pin VQFN or a 14-pin TSSOP package and is specified from –40°C to 85°C.

Features

  • High Efficiency, Low Power Consumption, 4.5-µA
    Typical Shutdown Current
  • Fixed Frequency Emulated On-Time Control,
    Adjustable from 100 kHz to 550 kHz
  • D-CAP™ Mode With 100-ns Load Step Response
  • < 1% Initial Reference Accuracy
  • Output Voltage Range: 0.75 V to 5.5 V
  • Wide Input Voltage Range: 1.8 V to 28 V
  • Selectable Auto-Skip/PWM-Only Operation
  • Temperature Compensated (4500 ppm/°C)
    Low-Side RDS(on) Overcurrent Sensing
  • Negative Overcurrent Limit
  • Integrated Boost Diode
  • Integrated OVP/UVP and Thermal Shutdown
  • Powergood Signal
  • Internal 1.2-ms Voltage Soft-Start
  • Integrated Output Discharge (Soft-Stop)
  • APPLICATIONS
    • Notebook Computers
    • I/O Supplies
    • System Power Supplies

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Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (Max) (A) Regulated outputs (#) Number of Phases Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Duty cycle (Max) (%) Operating temperature range (C) Rating Package Group Type Control mode
TPS51117 Order now 1.8     28     0.76     5.5     10     1     1     100     550     0.4     Enable
Power Good
Pre-Bias Start-Up
Synchronous Rectification    
95     -40 to 85     Catalog     TSSOP | 14
VQFN | 14    
Controller     D-CAP    
TPS51217 Order now 3     28     0.6     2.6     20     1     1     312     368     0.32     Dynamic Voltage Scaling
Enable
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification    
89     -40 to 85     Catalog     WSON | 10     Controller     D-CAP    
TPS51218 Order now 3     28     0.7     2.6     20     1     1     266     465     0.32     Enable
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification    
91     -40 to 85     Catalog     WSON | 10     Controller     D-CAP