TPS51123 Dual-Synch Step-Down Controller w/Out-of-Audio Operation 100mA LDO f/Notebook Sys Pwr | TI.com

TPS51123 (ACTIVE)

Dual-Synch Step-Down Controller w/Out-of-Audio Operation 100mA LDO f/Notebook Sys Pwr

 

Description

The TPS51123 is a cost effective, dual-synchronous buck controller targeted for notebook system power supply solutions. It provides 5-V and 3.3-V LDOs and requires few external components. The TPS51123 supports high efficiency, fast transient responses and provides a combined power-good signal. Out-of-Audio mode light-load operation enables low acoustic noise at much higher efficiency than conventional forced PWM operation. Adaptive on-time D-CAP control provides convenient and efficient operation. The part operates with supply input voltages ranging from 5.5 V to 28 V and supports output voltages from 2 V to 5.5 V. The TPS51123 is available in a 24-pin QFN package and is specified from -40°C to 85°C ambient temperature range.

Features

  • Wide-Input Voltage Range: 5.5 V to 28 V
  • Output Voltage Range: 2 V to 5.5 V
  • Built-in 100-mA 5-V/3.3-V LDO with Switches
  • Built-in 1% 2-V Reference Output
  • With/Without Out-of-Audio™ Mode Selectable
    Light-Load and PWM only Operation
  • Internal 1.6-ms Voltage Servo Softstart
  • Adaptive On-Time Control Architecture with Four
    Selectable Frequency Setting
  • 4500 ppm/°C RDS(on) Current Sensing
  • Built-In Output Discharge
  • Power Good Output
  • Built-in OVP/UVP/OCP
  • Thermal Shutdown (Non-latch)
  • 24-Pin QFN (RGE) Package

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Parametrics Compare all products in Buck controllers (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
Type
Control mode
TPS51123 TPS51120 TPS51124 TPS51125A TPS51220 TPS51220A
5.5     4.5     3     5.5     4.5     4.5    
28     28     28     28     28     32    
2     1     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    
200     180     240     300     200     200    
460     500     420     460     1000     1000    
0.55     0.75     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    
93     88     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 | 24     VQFN | 32     VQFN | 24     VQFN | 24     VQFN | 32     QFN | 32
WQFN | 32    
Controller     Controller     Controller     Controller     Controller     Controller    
D-CAP     Current Mode
D-CAP    
D-CAP     D-CAP     Current Mode
D-CAP