TPS51120 Dual Current Mode, Synch Step-Down Controller With 100-mA Standby Reg For Notebook System Power | TI.com

TPS51120 (ACTIVE) Dual Current Mode, Synch Step-Down Controller With 100-mA Standby Reg For Notebook System Power

 

Description

The TPS51120 is a highly sophisticated dual, synchronous step-down controller. It is a full featured controller designed to run directly off a three- or four-cell Li-ion battery and provide high-power and 5-V and/or 3.3-V standby regulation for all the downstream circuitry in a notebook computer system. High-current, 100-mA, 5-V or 3.3-V on-board linear regulators have glitch-free switch over function to SMPS and can be kept alive independently during standby state. The pseudo-constant frequency adaptive on-time control scheme supports full range of current mode operation including simplified loop compensation, ceramic output capacitors as well as seamless transition to reduced frequency operation at light-load condition. Optional D-CAP mode operation optimized for SP-CAP or POSCAP output capacitors allows further reduction of external compensation parts. Dynamic UVP supports VIN line sag without latch off by hitting 5-V UVP. No negative voltage appears at output voltage node during UVLO, UVP, and OCP, OTP or loss of VIN.

The TPS51120 32-pin QFN package is specified from –40°C to 85°C ambient temperature.

Features

  • 3.3-V and 5-V 100-mA Bootstrapped Standby
    Regulators with Independent Enables
  • Selectable D-CAP™ Mode Enables Fast Transient
    Response Less than 100 ns
  • Selectable Low Ripple Current Mode
  • Less than 1% Internal Reference Accuracy
  • Selectable PWM-only/Auto-skip Modes
  • Low-side RDS(on) Loss-less Current Sensing
  • RSENSE Accurate Current Sense Option
  • Internal Soft-Start and Integrated VOUT Discharge
    Transistors
  • Integrated 2-V Reference
  • Adaptive Gate Drivers with Integrated Boost Diode
  • Powergood for Each Channel with Delay Timer
  • Fault Disable Mode
  • Supply Input Voltage Range: 4.5 V to 28 V

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
TPS51120 Order now 4.5     28     1     5.5     20     2     1     180     500     0.75     Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
88     -40 to 85     Catalog     VQFN | 32     Controller     Current Mode
D-CAP    
TPS51123 Order now 5.5     28     2     5.5     20     2     1     200     460     0.55     Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
93     -40 to 85     Catalog     VQFN | 24     Controller     D-CAP    
TPS51124 Order now 3     28     0.76     5.5     15     2     1     240     420     0.35     Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
88     -40 to 85     Catalog     VQFN | 24     Controller     D-CAP    
TPS51125 Order now 5.5     28     2     5.5     20     2     1       460     0.55     Enable
Light Load Efficiency
Power Good    
93     -40 to 85     Catalog     VQFN | 24     Controller      
TPS51125A Order now 5.5     28     2     5.5     20     2     1     300     460     0.55     Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
93