The LMR61428 is a step-up DC-DC switching regulator for battery-powered and low input voltage systems that can achieve efficiencies up to 90%. It has a wide input voltage range from 1.2V to 14V and a possible regulated output voltage range of 1.24V to 14V. It has an internal 0.17Ω N-Channel MOSFET power switch.

The high switching frequency of up to 2MHz of the LMR61428 allows for tiny surface mount inductors and capacitors. Because of the unique constant-duty-cycle gated oscillator topology very high efficiencies are realized over a wide load range. The supply current is reduced to 80µA because of the BiCMOS process technology. In the shutdown mode, the supply current is less than 2.5µA. The LMR61428 is available in a VSSOP-8 package.

• 1.2V to 14V Input Voltage
• Adjustable Output Voltage up to 14V
• Switch Current up to 2.85A
• Up to 2 MHz Switching Frequency
• Low Shutdown Iq, <1μA
• Cycle-by-Cycle Current Limiting
• VSSOP Packaging (3.0 x 5.0 x 1.09mm)
• WEBENCH Enabled

Performance Benefits

• Extremely Easy to Use
• Tiny Overall Solution Reduces System Cost

SIMPLE SWITCHER is a trademark of Texas Instruments. WEBENCH is a trademark of Texas Instruments. All trademarks are the property of their respective owners.

• Vin (Min) (V)
• 1.2
• Vin (Max) (V)
• 14
• Vout (Min) (V)
• 1.24
• Vout (Max) (V)
• 14
• Switch current limit (Typ) (A)
• 2.85
• Regulated outputs (#)
• 1
• Switching frequency (Min) (kHz)
• 300
• Switching frequency (Max) (kHz)
• 2000
• Iq (Typ) (mA)
• 0.1
• Features
• Enable
• Duty cycle (Max) (%)
• 70
• Rating
• Catalog

LMR61428的完整型号有：LMR61428XMM/NOPB、LMR61428XMMX/NOPB，以下是这些产品的关键参数及官网采购报价：

LMR61428XMM/NOPB，工作温度：-40 to 85，封装：VSSOP (DGK)-8，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LMR61428XMM/NOPB的批量USD价格：0.79（1000+）

LMR61428XMMX/NOPB，工作温度：-40 to 85，封装：VSSOP (DGK)-8，包装数量MPQ：3500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LMR61428XMMX/NOPB的批量USD价格：0.658（1000+）

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IntroductionThe LMR61428 evaluation module is designed to provide the power supply design engineer with a fully functional regulatordesign. The evaluation module takes the input from a single Li-Ion battery and boosts the voltage up to 5V at a constant loadcapability of 500mA. The switching (...)

LMR61428 Unencrypted PSpice Transient Model Package (Rev. A)

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。

借助?PSpice for TI 的设计和仿真环境及其内置的模型库，您可对复杂的混合信号设计进行仿真。创建完整的终端设备设计和原型解决方案，然后再进行布局和制造，可缩短产品上市时间并降低开发成本。

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PMP30296 — 用于低输入电压的微型 SEPIC 参考设计

此参考设计的输入电压为 1.8V 至 9.6V，输出电压为 3.3V，最大电流为 200mA。在突发模式下，LMR61428 采用恒定占空比 (60%-70%)。