TPS51125A Dual-Synchronous, Step-Down Controller with Out-of-Audio Operation and 100-mA LDOs | TI.com

TPS51125A (ACTIVE)

Dual-Synchronous, Step-Down Controller with Out-of-Audio Operation and 100-mA LDOs

 

Description

The TPS51125A 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 270-kHz VCLK output can be used to drive an external charge pump, generating gate drive voltage for the load switches without reducing the main converter’s efficiency. The TPS51125A supports high efficiency, fast transient response 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 TPS51125A 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)
  • QFN24 (RGE)

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
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    
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    
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    
99     -40 to 85