LM20333

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具有频率同步功能的 4.5V 至 36V、3A 电流模式同步降压稳压器

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数据表

document-pdfAcrobat LM20333 36V, 3A Synchronous Buck Regulator with Frequency Synchronization 数据表 (Rev. D) (英语)

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TLVM13630

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高密度 3V 至 36V 输入、1V 至 6V 输出、3A 降压电源模块 Save board space, simplify design and speed time to market with an integrated-inductor power module.

LM20333

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数据表

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产品详情

Iout (max) (A)

3

Vin (min) (V)

4.5

Vin (max) (V)

36

Topology

Buck

Type

Converter

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

Control mode

current mode

Vout (min) (V)

0.8

Vout (max) (V)

32

Rating

Catalog

Operating temperature range (°C)

-40 to 125

Iq (typ) (A)

0.0023

Iout (max) (A)

3

Vin (min) (V)

4.5

Vin (max) (V)

36

Topology

Buck

Type

Converter

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

Control mode

current mode

Vout (min) (V)

0.8

Vout (max) (V)

32

Rating

Catalog

Operating temperature range (°C)

-40 to 125

Iq (typ) (A)

0.0023

HTSSOP (PWP)

20

41.6 mm² 6.5 x 6.4

4.5V to 36V Input Voltage Range
3A Output Current, 5.2A Peak Current
130 mΩ/110 mΩ 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.

4.5V to 36V Input Voltage Range
3A Output Current, 5.2A Peak Current
130 mΩ/110 mΩ 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.

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.

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.

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	类型	标题	日期
*	数据表	LM20333 36V, 3A Synchronous Buck Regulator with Frequency Synchronization 数据表 (Rev. D)	2013年 4月 3日
	选择指南	电源管理指南 2018 (Rev. K)	2018年 7月 31日
	选择指南	电源管理指南 2018 (Rev. R)	2018年 6月 25日
	EVM 用户指南	AN-1791 LM20333 Evaluation Board (Rev. B)	2013年 5月 5日
	设计指南	适用于 Xilinx FPGA 的模拟器件解决方案指南	2012年 4月 24日

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评估板

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 (...)

用户指南: PDF