The TPS51125 is a cost-effective, dual-synchronous buck controller targeted for notebook system power supply solutions. The device 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, thus generating gate drive voltage for the load switches without reducing the efficiency of the main converter. The TPS51125 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 TPS51125 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 and 3.3-V LDO With Switches
• Built-In 1% 2-V Reference Output
• With or Without Out-of-Audio? Mode Selectable Light-Load and PWM-Only Operation
• Internal 1.6-ms Voltage Servo Soft-Start
• Adaptive On-Time Control Architecture With Four Selectable Frequency Setting
• 4500 ppm/\xC2°C RDS(on) Current Sensing
• Built-In Output Discharge
• Powergood Output
• Built-In OVP/UVP/OCP
• Thermal Shutdown (Nonlatch)
• QFN, 24-Pin (RGE)
• APPLICATIONS
  • Notebook Computers
  • I/O Supplies
  • System Power Supplies

All other trademarks are the property of their respective owners

• 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)
• 200
• Switching frequency (Max) (kHz)
• 460
• Features
• Enable, Light Load Efficiency, Power Good
• Regulated outputs (#)
• 2
• Number of phases
• 1
• Rating
• Catalog

TPS51125的完整型号有：TPS51125RGER、TPS51125RGET，以下是这些产品的关键参数及官网采购报价：

TPS51125RGER，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TPS51125RGER的批量USD价格：1.213（1000+）

TPS51125RGET，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TPS51125RGET的批量USD价格：1.444（1000+）

TPS51125EVM — TPS51125 评估模块

TPS51125 是面向笔记本系统电源解决方案的经济高效的双路同步降压控制器。它提供 5V 和 3.3V LDO 并且只需要使用极少的外部组件。270kHz VCLK 输出可用于驱动外部充电泵，在不降低主转换器工作效率的情况下生成用于负载开关的栅极驱动电压。TPS51125 支持高效、快速瞬态响应并提供结合型使能信号。Out-of-Audio 模式轻载操作不但实现了低噪声，其效率也远远高于传统强制 PWM。Adaptive on-time D-CAP 控制提供了便捷高效的操作。该部件在 5.5V 至 28V 的电源输入电压范围内工作，并支持 2V 至 5.5V (...)

TPS51125 Unencrypted PSpice Transient Model Package (Rev. B)

PSpice for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence 的模拟分析引擎。PSpice for TI 可免费使用，包括业内超大的模型库之一，涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。

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在?PSpice for TI 设计和仿真工具中，您可以搜索 TI (...)