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

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

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

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Parametrics Compare all products in Buck Controller (External Switch)

 
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
Control Mode
TPS51120 TPS51123 TPS51124 TPS51125A TPS51220 TPS51220A
4.5     5.5     3     5.5     4.5     4.5    
28     28     28     28     28     32    
1     2     0.76     2     1     1    
5.5     5.5     5.5     5.5     12     12    
20     20     15     20     20     20    
2     2     2     2     2     2    
1     1     1     1     1     1    
180     200     240     300     200     200    
500     460     420     460     1000     1000    
0.75     0.55     0.35     0.55     1.3     1.3    
Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
Enable
Frequency Synchronization
Light Load Efficiency
Phase Interleaving
Power Good
Synchronous Rectification    
Enable
Frequency Synchronization
Light Load Efficiency
Phase Interleaving
Power Good
Synchronous Rectification    
88     93     88     93     99     99    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
VQFN     VQFN     VQFN     VQFN     VQFN     QFN
WQFN    
Current Mode
D-CAP    
D-CAP     D-CAP     D-CAP     Current Mode
D-CAP