tps51219代用芯片（tps51123芯片引脚顺序）



双路同步降压型控制器，具有Out-of Audioâ - ?? ¢操作和100mA LDO的用于笔记本系统电源 Dual-Synchronous, Step-Down Controller with Out-of-Audio™ Operation and 100-mA LDOs for Notebook System Power

DESCRIPON

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.

FEATURES

• 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 R

DS(on)

Current Sensing

• Built-In Output Discharge

• Power Good Output

• Built-in OVP/UVP/OCP

• Thermal Shutdown (Non-latch)

• QFN24 (RGE)

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