The TPS7H4002-SP is a radiation hardened, 5.5-V, 3-A synchronous step-down converter, which is optimized for small designs through high efficiency and by integrating the high-side and low-side MOSFETs. Further space savings are achieved through current mode control, which reduces component count, and a high switching frequency, which reduces the inductor footprint.

The output voltage startup ramp is controlled by the SS/TR pin which allows operation as either a stand alone power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and the open drain power good pins. In addition, the TPS7H4002-SP can be configured in primary-secondary mode for parallel operation.

Cycle-by-cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current limit which prevents current runaway. There is also a low-side sinking current limit which turns off the low-side MOSFET to prevent excessive reverse current. Thermal shutdown disables the part when die temperature exceeds thermal limit.

• Radiation performance:
  • Radiation-hardness-assured up to TID 100 krad(Si)
  • SEL, SEB, and SEGR immune to LET = 75 MeV-cm2/mg
  • SET and SEFI characterized up to LET = 75 MeV-cm2/mg
• Peak efficiency: 96.9% (VO = 2.5 V)
• Integrated 50-m? and 35-m? MOSFETs
• Power rail: 3 to 5.5 V on VIN
• 3-A maximum output current
• Flexible switching frequency options:
  • 100-kHz to 1-MHz adjustable internal oscillator
  • External sync capability: 100 kHz to 1 MHz
  • SYNC pin can be configured as a 500-kHz output for primary-secondary applications
• 0.807-V ±1.5% voltage reference over temperature, radiation, and line and load regulation
• Monotonic start-up into prebiased outputs
• Adjustable soft start through external capacitor
• Input enable and power-good output for power sequencing
• Power good output monitor for undervoltage and overvoltage
• Adjustable input undervoltage lockout (UVLO)
• 20-pin ultra-small, thermally-enhanced ceramic flatpack package (HKH) for space applications

• Vin (Min) (V)
• 3
• Vin (Max) (V)
• 5.5
• Vout (Min) (V)
• 0.804
• Vout (Max) (V)
• 5.3
• Iout (Max) (A)
• 3
• Iq (Typ) (uA)
• 2500
• Switching frequency (Min) (kHz)
• 100
• Switching frequency (Max) (kHz)
• 1000
• Features
• Enable, Frequency Synchronization, Over Current Protection, Power Good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, Tracking, UVLO Adjustable
• Rating
• Space
• Regulated outputs (#)
• 1
• Control mode
• Current Mode
• Duty cycle (Max) (%)
• 100

TPS7H4002-SP的完整型号有：5962R2021001V9A、5962R2021001VSC、TPS7H4002HKH/EM、TPS7H4002Y/EM，以下是这些产品的关键参数及官网采购报价：

5962R2021001V9A，工作温度：-55 to 125，封装： (KGD)-0，包装数量MPQ：25个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：Call TI，TI官网5962R2021001V9A的批量USD价格：1675.8（1000+）

5962R2021001VSC，工作温度：-55 to 125，封装：CFP (HKH)-20，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：AU，TI官网5962R2021001VSC的批量USD价格：1675.8（1000+）

TPS7H4002HKH/EM，工作温度：25 to 25，封装：CFP (HKH)-20，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：AU，TI官网TPS7H4002HKH/EM的批量USD价格：465.593（1000+）

TPS7H4002Y/EM，工作温度：25 to 25，封装： (KGD)-0，包装数量MPQ：5个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：Call TI，TI官网TPS7H4002Y/EM的批量USD价格：474.81（1000+）

TPS7H4002EVM-CVAL — TPS7H4002-SP 3V 至 5.5V 输入、3A 同步降压转换器评估模块

TPS7H4002EVM-CVAL 演示了耐辐射 TPS7H4002-SP 降压转换器如何提供一个负载电流可高达 3A 的稳压电源轨，从而支持典型的航天级电源管理应用。

TPS7H4002-SP PSpice 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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