TPS51225RUKR

双同步，降压型控制器，带有5 - V和3.3 V的LDO Dual Synchronous, Step-Down Controller with 5-V and 3.3-V LDOs

DESCRIPON

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 RDSon Current Sensing Scheme with 4500 ppm/°C Temperature Coefficient

• Built-in Output Discharge Function

• Separate Enable Input for SwitchersTPS51225/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