TPS51225B - Texas Instruments

TPS51225B Step-Down Controller

The TPS51225/B/C is a cost-effective, dualsynchronous buck controller targeted for notebook system-power supply solutions. It provides 5-V and 3.3-V LDOs and requires few external components. The 260-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 efficiency.

Features

1 APPLICATIONS
•2 Input Voltage Range: 5.5 V to 24 V
• Notebook Computers
• Output Voltages: 5 V and 3.3 V (Adjustable Range ±10%)
• Built-in, 100-mA, 5-V and 3.3-V LDOs
• Clock Output for Charge-Pump
• ±1% Reference Accuracy
• Adaptive On-time D-CAP™ Mode Control Architecture with 300kHz/355kHz Frequency Setting
• Auto-skip Light Load Operation (TPS51225/C)
• OOA Light Load Operation (TPS51225B)
• Internal 0.8-ms Voltage Servo Soft-Start
• Low-Side RDS(on) Current Sensing Scheme with 4500 ppm/°C Temperature Coefficient
• Built-in Output Discharge Function
• Separate Enable Input for Switc.