The LM20333 is a full featured synchronous buck regulator capable of delivering up to 3A of load current. The current mode control loop is externally compensated with only two 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 power good (PGOOD) circuit.

The LM20333 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 LM20333 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 switching frequency of the LM20333 can be synchronized to an external clock by use of the SYNC pin. The SYNC pin is capable of synchronizing to input signals ranging from 250 kHz to 1.5 MHz.

The LM20333 is offered in an exposed pad 20-pin HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks.

• 4.5V to 36V Input Voltage Range
• 3A Output Current, 5.2A Peak Current
• 130 m?/110 m? Integrated Power MOSFETs
• 94% Peak Efficiency with Synchronous Rectification
• 1.5% Feedback Voltage Accuracy
• Current Mode Control, Selectable Compensation
• Oscillator Synchronization from 250kHz to 1.5MHz
• 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 Minimizes Inductor Size
• Non-linear Current Mode Slope Compensation
• 20-Pin HTSSOP Exposed Pad Package

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)
• 3
• Iq (Typ) (uA)
• 2300
• Switching frequency (Min) (kHz)
• 250
• Switching frequency (Max) (kHz)
• 1500
• Features
• Enable, Frequency Synchronization, Over Current Protection, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Tracking
• Rating
• Catalog
• Regulated outputs (#)
• 1
• Control mode
• Current Mode
• Duty cycle (Max) (%)
• 80

LM20333的完整型号有：LM20333MH/NOPB、LM20333MHE/NOPB、LM20333MHX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM20333MH/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LM20333MH/NOPB的批量USD价格：2.149（1000+）

LM20333MHE/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LM20333MHE/NOPB的批量USD价格：2.149（1000+）

LM20333MHX/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LM20333MHX/NOPB的批量USD价格：1.791（1000+）

LM20333EVAL — 用于 LM20333 的评估板

This evaluation board provides a solution to examine the full featured LM20333 buck switching regulator that is capable of driving up to 3A of load current. This device features a clock synchronization input that allows the switching frequency to be synchronized to an external clock source. The (...)

LM20333 TINA-TI Transient Reference Design

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 (...)

LM20333DESIGN-CALC — LM20333 计算器电子表格

PMP7804 参考设计提供为 Xilinx Kintex 7 系列 FPGA 供电时所需的所有电源轨。该设计使用 Simple Switcher 电源模块以及 LM2121x 低电压同步降压稳压器，使用方便，设计周期更短。此设计已针对 12V 输入经过优化。