The TPS51120 is a highly sophisticated dual, synchronous step-down controller. It is a full featured controller designed to run directly off a three- or four-cell Li-ion battery and provide high-power and 5-V and/or 3.3-V standby regulation for all the downstream circuitry in a notebook computer system. High-current, 100-mA, 5-V or 3.3-V on-board linear regulators have glitch-free switch over function to SMPS and can be kept alive independently during standby state. The pseudo-constant frequency adaptive on-time control scheme supports full range of current mode operation including simplified loop compensation, ceramic output capacitors as well as seamless transition to reduced frequency operation at light-load condition. Optional D-CAP mode operation optimized for SP-CAP or POSCAP output capacitors allows further reduction of external compensation parts. Dynamic UVP supports VIN line sag without latch off by hitting 5-V UVP. No negative voltage appears at output voltage node during UVLO, UVP, and OCP, OTP or loss of VIN.

The TPS51120 32-pin QFN package is specified from –40°C to 85°C ambient temperature.

• 3.3-V and 5-V 100-mA Bootstrapped Standby Regulators with Independent Enables
• Selectable D-CAP? Mode Enables Fast Transient Response Less than 100 ns
• Selectable Low Ripple Current Mode
• Less than 1% Internal Reference Accuracy
• Selectable PWM-only/Auto-skip Modes
• Low-side RDS(on) Loss-less Current Sensing
• RSENSE Accurate Current Sense Option
• Internal Soft-Start and Integrated VOUT Discharge Transistors
• Integrated 2-V Reference
• Adaptive Gate Drivers with Integrated Boost Diode
• Powergood for Each Channel with Delay Timer
• Fault Disable Mode
• Supply Input Voltage Range: 4.5 V to 28 V

• Vin (Min) (V)
• 4.5
• Vin (Max) (V)
• 28
• Vout (Min) (V)
• 1
• Vout (Max) (V)
• 5.5
• Iout (Max) (A)
• 20
• Iq (Typ) (uA)
• 750
• Switching frequency (Min) (kHz)
• 180
• Switching frequency (Max) (kHz)
• 500
• Features
• Enable, Light Load Efficiency, Power Good, Synchronous Rectification
• Regulated outputs (#)
• 2
• Number of phases
• 1
• Rating
• Catalog

TPS51120的完整型号有：TPS51120RHBR、TPS51120RHBT，以下是这些产品的关键参数及官网采购报价：

TPS51120RHBR，工作温度：-40 to 85，封装：VQFN (RHB)-32，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TPS51120RHBR的批量USD价格：1.413（1000+）

TPS51120RHBT，工作温度：-40 to 85，封装：VQFN (RHB)-32，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TPS51120RHBT的批量USD价格：1.683（1000+）

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