TPS51220 Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller | TI.com

TPS51220 (ACTIVE) Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller

 

Description

The TPS51220 is a dual synchronous buck regulator controller with 2 LDOs. It is optimized for 5-V/3.3-V system controller, enabling designers to cost effectively complete 2-cell to 4-cell notebook system power supply. The TPS51220 supports high efficiency, fast transient response and 99% duty cycle operation. It supports supply input voltage ranging from 4.5 V to 28 V, and output voltages from 1 V to 12 V. Two types of control schemes can be chosen depending on the application. Peak current mode supports stability operation with lower ESR capacitor and output accuracy. The D-CAP mode supports fast transient response. The high duty (99%) operation and the wide input/output voltage range supports flexible design for small mobile PCs and a wide variety of other applications. The fixed frequency can be adjusted from 200 kHz to 1 MHz by a resistor, and each channel runs 180° out of phase. The TPS51220 can also synchronize to the external clock, and the interleaving ratio can be adjusted by its duty. The TPS51220 is available in the 32 pin 5x5 QFN package and is specified from -40°C to 85°C.

Features

  • Input Voltage Range: 4.5 V to 28 V
  • Output Voltage Range: 1 V to 12 V
  • Selectable Light Load Operation (Continuous / Auto Skip / Out-Of-Audio Skip)
  • Programmable Droop Compensation
  • Voltage Servo Adjustable Soft Start
  • 200 kHz to 1 MHz Fixed Frequency PWM
  • Selectable Current/D-CAP Mode Architecture
  • 180° Phase Shift Between Channels
  • Resistor or Inductor DCR Current Sensing
  • Powergood Output for Each Channel
  • OCL/OVP/UVP/UVLO Protections (OVP Disable Option)
  • Thermal Shutdown (Non-Latch)
  • Output Discharge Function (Disable Option)
  • Integrated Boot Strap MOSFET Switch
  • QFN-32 (RHB)
  • APPLICATIONS
    • Notebook Computer System and I/O Bus
    • Point of Load in LCD TV, MFP

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
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     Catalog     VQFN | 32     Controller     Current Mode
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    
TPS51125 Order now 5.5     28     2     5.5     20     2     1       460     0.55     Enable
Light Load Efficiency
Power Good    
93