The TPS51125A 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 TPS51125A 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 TPS51125A is available in a 24-pin QFN package and is specified from -40°C to 85°C ambient temperature range.

• 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)
• QFN24 (RGE)

• Vin (Min) (V)
• 5.5
• Vin (Max) (V)
• 28
• Vout (Min) (V)
• 2
• Vout (Max) (V)
• 5.5
• Iout (Max) (A)
• 20
• Iq (Typ) (uA)
• 550
• Switching frequency (Min) (kHz)
• 300
• Switching frequency (Max) (kHz)
• 460
• Features
• Enable, Light Load Efficiency, Power Good, Synchronous Rectification
• Regulated outputs (#)
• 2
• Number of phases
• 1
• Rating
• Catalog

TPS51125A的完整型号有：TPS51125ARGER、TPS51125ARGET，以下是这些产品的关键参数及官网采购报价：

TPS51125ARGER，工作温度：-40 to 85，封装：VQFN (RGE)-24，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS51125ARGER的批量USD价格：1.213（1000+）

TPS51125ARGET，工作温度：-40 to 85，封装：VQFN (RGE)-24，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS51125ARGET的批量USD价格：1.444（1000+）

TPS51125 Unencrypted PSpice Transient Model Package (Rev. B)

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