●DESCRIPTION
●The TPS51225/B/C 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 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. The TPS51225/B/C supports high efficiency, fast transient response and provides a combined power-good signal. Adaptive on-time, D-CAP™ control provides convenient and efficient operation. The device operates with supply input voltage ranging from 5.5 V to 24 V and supports output voltages of 5.0 V and 3.3 V. The TPS51225/B/C is available in a 20-pin, 3 mm × 3 mm, QFN package and is specified from –40°C to 85°C.
●FEATURES
●• Input Voltage Range: 5.5 V to 24 V
●• 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 Switchers(TPS51225/B/C)
●• Dedicated OC Setting Terminals
●• Power Good Indicator
●• OVP/UVP/OCP Protection
●• Non-latch UVLO/OTP Protection
●• 20-Pin, 3 mm × 3 mm, QFN (RUK)
●APPLICATIONS
●• Notebook Computers
●• Netbook, Tablet Computers
