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MAXREFDES1142: Ultra miniature Two Layer 4A, 1.8V Step-Down DC-DC Converter with Integrated Switches Using MAX15051

MAXREFDES1142

参考设计免责声明 参照  重要声明和免责声明  涵盖参考设计和其他Maxim资源

描述

The MAX15051 is a high-efficiency switching regulator that delivers up to 4A load current at output voltages from 0.6V to (0.9 x VIN). The device operates from 2.9V to 5.5V, making it ideal for on-board point-of-load and postregulation applications. The total output-voltage accuracy is within ±1% over load, line, and temperature.

The MAX15051 features 1MHz fixed-frequency PWM operation, and pulse-skip mode to improve light-load efficiency. The high operating frequency allows for small-size external components. The low-resistance on-chip nMOS switches ensure high efficiency at heavy loads while minimizing critical parasitic inductances, making the layout a much simpler task with respect to discrete solutions.

The device incorporates a high-bandwidth (> 26MHz) voltage-error amplifier. The voltage-mode control architecture and the voltage-error amplifier permit a Type III compensation scheme to achieve maximum loop bandwidth, up to 200kHz. High loop bandwidth provides fast transient response, resulting in less required output capacitance and allowing for all-ceramic capacitor designs.

The output overload hiccup protection and peak current limit on both high-side and low-side MOSFETs provide for ultra-safe operation in the cases of short-circuit conditions, severe overloads, or in converters with bulk electrolytic capacitors.

The output voltage is adjustable by using two external resistors at the feedback or by applying an external reference voltage to the REFIN/SS input.

The MAX15051 offers a programmable soft-start time using one capacitor to reduce input inrush current. A built-in thermal shutdown protection ensures safe operation under all conditions. Other features include the following:

Key Features

  • 20μA Startup Current in UVLO
  • Programmable Input Undervoltage Lockout
  • Programmable Input Overvoltage Protection
  • Switching Frequency Synchronization
  • Adjustable Soft-Start
  • Programmable Slope Compensation
  • Fast Cycle-by-Cycle Peak Current Limit
  • 70ns Internal Leading-Edge Current-Sense Blanking
  • Hiccup Mode Output Short-Circuit Protection

Icon

设计,建造,测试

图中的电路板已完全组装并经过测试。不可出售。

 

参数化

输入类型 Vin(Min) Vin(Max) Iout(Max) 单路/多路输出 Vout(V) Pout(W) 隔离/非隔离 拓扑
DC 3 3.6 4 - 1.8 7.2 Non-Isolated Synchronous Buck

参数化

输入类型 DC
Vin(Min) 3
Vin(Max) 3.6
Iout(Max) 4
单路/多路输出 -
Vout(V) 1.8
Pout(W) 7.2
隔离/非隔离 Non-Isolated
拓扑 Synchronous Buck

Maxim设备 (1)

器件号 名称 产品线 购买 设计套件和评估模块
MAX15051 高效、4A、1MHz、降压型调节器,内置开关,采用2mm x 2mm封装 开关稳压器 立即购买 设计套件

Maxim设备 (1)

器件号 产品线
开关稳压器
高效、4A、1MHz、降压型调节器,内置开关,采用2mm x 2mm封装

设计资料 (6)

日期 类型
2019-11-04

maxrefdes1142-fab-assembly

(ZIP, 3MB)

2019-07-09

maxrefdes1142_pcb

(PDF, 1MB)

2019-07-09

MAXREFDES1142 Test Results

(PDF, 141KB)

2019-07-09

MAXREFDES1142 - Ultraminiature Two Layer 4A, 1.8V Step-Down DC-DC Converter with Integrated Switches Using MAX15051

(PDF, 631KB)

2019-07-09

maxrefdes1142_schematic

(PDF, 24KB)

2019-07-09

maxrefdes1142_bom

(PDF, 95KB)

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