The TPS51427 is a dual synchronous step-down controller designed for notebook and mobile communications applications. This device is part of a low-cost suite of notebook power bus regulators that enables system designs with low external component counts. The TPS51427 includes two pulse-width-modulation (PWM) controllers, SMPS1 and SMPS2. The output of SMPS1 can be adjusted from 0.7 V to 5.9 V, while the output of SMPS2 can be adjusted from 0.5 V to 2.5 V. This device also features a low-dropout (LDO) regulator that provides a 5-V/3.3-V output, or adjustable from 0.7-V to 4.5-V output via LDOREFIN. The fixed-frequency emulated adaptive on-time control supports seamless operation between PWM mode under heavy load conditions and reduced frequency operation at light loads for high-efficiency down to the milliampere range. An integrated boost switch enhances the high-side MOSFET to further improve efficiency. The main control loop is the D-CAP™ mode that is optimized for low equivalent series resistance (ESR) output capacitors such as POSCAP or SP-CAP. Advanced ramp compensation minimizes jitter without degrading line and load regulation. R_DS(on) current sensing methods offers maximum cost saving.

The TPS51427 supports supply input voltages that range from 5.5 V to 28 V. It is available in the 32-pin, 5-mm × 5-mm QFN package (Green, RoHs- compliant, and Pb-free). The device is specified from -40°C to +85°C.

• Fixed-Frequency Emulated On-Time Control; Frequency Selectable from Three Options
• D-CAP? Mode Enables Fast Transient Response Less than 100 ns
• Advanced Ramp Compensation Allows Low Output Ripple with Minimal Jitter
• Selectable PWM-Only/OOA/Auto-Skip Modes
• Wide Input Voltage Range: 5.5 V to 28 V
• Dual Fixed or Adjustable SMPS:
  • 0.7 V to 5.9 V (Channel1)
  • 0.5 V to 2.5 V (Channel2)
• Fixed 3.3-V/5-V, or Adjustable Output 0.7-V to 4.5-V LDO; Capable of Sourcing 100 mA
• Fixed 3.3-VREF Output Capable of Sourcing 10 mA
• Temperature Compensated Low-Side RDS(on) Current Sensing
• Adaptive Gate Drivers with Integrated Boost Switch
• Bootstrap Charge Auto Refresh
• Integrated Soft Start, Tracking Soft Stop
• Independent PGOOD and EN for Each Channel
• APPLICATIONS
  • Notebook I/O and System Bus Rails
  • Graphics Application
  • PDAs and Mobile Communication Devices

D-CAP, OOA are trademarks of Texas Instruments All other trademarks are the property of their respective owners

• Vin (Min) (V)
• 5.5
• Vin (Max) (V)
• 28
• Vout (Min) (V)
• 0.7
• Vout (Max) (V)
• 5.9
• Iout (Max) (A)
• 20
• Iq (Typ) (uA)
• 100
• Switching frequency (Min) (kHz)
• 25
• Switching frequency (Max) (kHz)
• 500
• Features
• Enable, Light Load Efficiency, Power Good, Synchronous Rectification
• Regulated outputs (#)
• 2
• Number of phases
• 1
• Rating
• Catalog

TPS51427的完整型号有：TPS51427RHBR、TPS51427RHBT，以下是这些产品的关键参数及官网采购报价：

TPS51427RHBR，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TPS51427RHBR的批量USD价格：1.888（1000+）

TPS51427RHBT，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TPS51427RHBT的批量USD价格：2.231（1000+）

TPS51427 PSpice Transient Model

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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