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

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
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    
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    
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    
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     -40 to 85     Catalog     VQFN | 24     Controller     D-CAP    
TPS51220 Order now 4.5     28     1     12     20     2     1     200     1000     1.3     Enable
Frequency Synchronization
Light Load Efficiency
Phase Interleaving
Power Good
Synchronous Rectification    
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