Dual-Synchronous, Step-Down Controller with Out-of-AudioT Operation and 100-mA LDOs - TPS51125

TPS51125 (ACTIVE)

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

Description

The TPS51125 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 TPS51125 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 TPS51125 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)
  • QFN, 24-Pin (RGE)
  • APPLICATIONS
    • Notebook Computers
    • I/O Supplies
    • System Power Supplies
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    Parametrics Compare all products in Step-Down (Buck) Controller

     
    Vin (Min) (V)
    Vin (Max) (V)
    Vout (Min) (V)
    Vout (Max) (V)
    Iout (Max) (A)
    Switching Frequency (Min) (kHz)
    Switching Frequency (Max) (kHz)
    Iq (Typ) (mA)
    Duty Cycle (Max) (%)
    Regulated Outputs (#)
    Topology
    Market Segment
    Control Mode
    Special Features
    Rating
    Operating Temperature Range (C)
    Iout2 (A)
    Pin/Package
    Approx. Price (US$)
    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    
    180     200     240     300     200     200    
    500     460     420     460     1000     1000    
    0.75     0.55     0.35     0.55     1.3     1.3    
    88     93     88     93     99     99    
    2     2     2     2     2     2    
    Buck     Buck     Buck     Buck     Buck     Buck    
    Mobile Computing     Mobile Computing     Mobile Computing     Mobile Computing     Mobile Computing     Mobile Computing    
    Current Mode
    D-CAP    
    D-CAP     D-CAP     D-CAP     Current Mode
    D-CAP    
    Current Mode
    D-CAP    
    Enable
    Power Good
    Light Load Efficiency
    Synchronous Rectification    
    Enable
    Power Good
    Light Load Efficiency
    Synchronous Rectification    
    Enable
    Power Good
    Light Load Efficiency
    Synchronous Rectification    
    Enable
    Light Load Efficiency
    Power Good
    Synchronous Rectification    
    Power Good
    Enable
    Frequency Synchronization
    Light Load Efficiency
    Phase Interleaving
    Synchronous Rectification    
    Power Good
    Enable
    Frequency Synchronization
    Light Load Efficiency
    Phase Interleaving
    Synchronous Rectification    
    Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
    -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85    
    20     20     20     20     20     20    
    32VQFN     24VQFN     24VQFN     24VQFN     32VQFN     32QFN
    32WQFN    
    2.31 | 1ku     1.95 | 1ku     1.94 | 1ku     1.95 | 1ku     2.25 | 1ku     2.25 | 1ku    
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