The LM20242 is a full featured 1MHz capable synchronous buck regulator capable of delivering up to 2A of load current. The current mode control loop is externally compensated with only two external components, offering both high performance and ease of use. The device is optimized to work over the input voltage range of 4.5V to 36V making it well suited for high voltage systems.

The device features internal Over Voltage Protection (OVP) and Over Current Protection (OCP) circuits for increased system reliability. A precision Enable pin and integrated UVLO allows the turn on of the device to be tightly controlled and sequenced. Startup inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated PGOOD circuit.

The LM20242 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20242 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.

The LM20242 is offered in an exposed pad 20 pin HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks.

• 2A Output Current, 3.7A Peak Current
• 130 m?/110 m? Integrated Power MOSFETs
• 1.5% Output Voltage Accuracy
• Current Mode Control, Selectable Compensation
• Resistor Programmed, 1MHz Capable Oscillator
• Synchronous Rectifier with Diode Emulation
• Adjustable Output Voltage Down to 0.8V
• Compatible with Pre-Biased Loads
• Programmable Soft-Start With External Capacitor
• Precision Enable Pin with Hysteresis
• OVP, UVLO Inputs and PGOOD Output
• Internally Protected with Peak Current Limit, Thermal Shutdown and Restart
• Accurate Current Limit with Frequency Foldback
• Non-Linear Current Mode Slope Compensation
• HTSSOP Exposed Pad Package

PowerWise is a trademark of Texas Instruments. All trademarks are the property of their respective owners.

• Vin (Min) (V)
• 4.5
• Vin (Max) (V)
• 36
• Vout (Min) (V)
• 0.8
• Vout (Max) (V)
• 32
• Iout (Max) (A)
• 2
• Iq (Typ) (uA)
• 2000
• Switching frequency (Min) (kHz)
• 100
• Switching frequency (Max) (kHz)
• 1000
• Features
• Enable, Over Current Protection, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Tracking
• Rating
• Catalog
• Regulated outputs (#)
• 1
• Control mode
• Current Mode
• Duty cycle (Max) (%)
• 90

LM20242的完整型号有：LM20242MH/NOPB、LM20242MHE/NOPB、LM20242MHX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM20242MH/NOPB，工作温度：-40 to 125，封装：HTSSOP (PWP)-20，包装数量MPQ：73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LM20242MH/NOPB的批量USD价格：1.742（1000+）

LM20242MHE/NOPB，工作温度：-40 to 125，封装：HTSSOP (PWP)-20，包装数量MPQ：250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LM20242MHE/NOPB的批量USD价格：1.742（1000+）

LM20242MHX/NOPB，工作温度：-40 to 125，封装：HTSSOP (PWP)-20，包装数量MPQ：2500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LM20242MHX/NOPB的批量USD价格：1.452（1000+）

LM20242EVAL — 36V，2A PowerWise® 可调节频率同步降压稳压器评估模块

The LM20242 synchronous rectifier Buck evaluation board is designed to provide the design engineer with a fully functional Buck power converter based on Current Mode Control to evaluate the LM20242 switching regulator IC. The evaluation board provides a 3.3V output with 2A current capability. The (...)

PSPICE-FOR-TI — 适用于 TI 设计和模拟工具的 PSpice

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。

在?PSpice for TI 设计和仿真工具中，您可以搜索 TI (...)

LM20242DESIGN-CALC — LM20242 计算器电子表格

PMP4494 是一款 5V 至 3.3V 1.2A 直流-直流转换器，具备输出电压保持电路。该设计运用了同步降压转换器 LM20242，旨在为系统电压提供高效率。升压转换器 TPS61170 将辅助轨从 10V 升至 20V，以提供备用电压。供电电压监控器 TLV809 监控系统电压，并在系统电压跌至阈值电压以下时，将供电电压切换至备用电压。保持电容与升压电路一起得以大幅减少，但仍然满足 200mS 保持时间的规格要求。