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Analog Devices / Maxim Integrated 美信 MAX17552 高效高压同步降压型转换器

美信MAX17552 高效高压同步降压型转换器集成了采用 4V 到 60V 输入电压工作的 MOSFET。该转换器在输出电压在 0.8V 到 0.9 倍 VIN 时可输出高达 100mA 的电流。输出电压精确到 ±1.75% 内（在 -40°C 到 +125°C 的温度范围内）。该器件采用峰值电流模式控制架构，带有 MODE 引脚，可在脉冲宽度调制、脉冲频率调制控制模式下操作器件。PWM 操作模式可实现各种负载下的恒定频率工作，适用于对开关频率敏感的应用。PFM 操作模式 可禁用负感应电流，并在轻负载下跳脉冲，实现高效率。PFM 模式下，该转换器仅消耗 22µA 的无负载电源电流。低电阻、片上 MOSFET 可确保满载时的高效，同时简化了电路板布局。

The ADI MAX17552 and MAX17552B Step-Down Converters employ a peak-current-mode control architecture with a MODE pin that can be used to operate the device in pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. PWM operation provides constant frequency operation at all loads and is useful in applications sensitive to variable switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. The Step-Down Converters consume only 22µA of no-load supply current in PFM mode. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify PCB layout.

特性

  • Eliminates external components and reduces total cost
    • No schottky-synchronous operation for high efficiency and reduced cost
    • Internal compensation
    • Fixed internal 5.1ms or programmable soft-start
    • All-ceramic capacitors, ultra-compact layout
  • Reduces number of DC-DC regulators to stock
    • Wide 4V to 60V input voltage range
    • Adjustable 0.8V to 0.9V  VIN output voltages
    • Delivers up to 100mA load current
    • 100kHz to 2.2MHz Adjustable switching frequency range with external synchronization
    • Configurable between PFM and forced-PWM modes
  • Reduces power dissipation
    • 22µA No load supply current
    • Peak efficiency >90%
    • PFM feature for high light-load efficiency
    • 1.2µA (typ) Shutdown current
  • Operates reliably in adverse industrial environments
    • Peak current-limit protection
  •  Built-in output-voltage monitoring with open-drain active-low RESET pin
    • Programmable EN/UVLO threshold
    • Monotonic startup into prebiased output
    • Overtemperature protection
    • -40°C to +125°C Industrial/automotive temperature range

应用

  • Industrial sensors and process control
  • 4mA to 20mA Current-loop powered sensors
  • High-voltage LDO replacement
  • Battery-powered equipment
  • HVAC and building control
  • General-purpose point of load

Typical Application Circuit

应用电路图 - Analog Devices / Maxim Integrated 美信 MAX17552 高效高压同步降压型转换器
View Results ( 5 ) Page
物料编号 数据表 输入电压 输入电压 - 最小值 输出电流 静态电流 开关频率
MAX17552BATB+T MAX17552BATB+T 数据表 4 V to 60 V 4 V 100 mA 18 uA 2.08 MHz
MAX17552AATB+T MAX17552AATB+T 数据表 4 V to 60 V 4 V 100 mA 525 uA 100 kHz to 2.08 MHz
MAX17551ATB+T MAX17551ATB+T 数据表 4 V to 60 V 4 V 50 mA 22 uA 2.08 MHz
MAX17551AUB+T MAX17551AUB+T 数据表 4 V to 60 V 4 V 50 mA 22 uA 2.08 MHz
MAX17551AUB+ MAX17551AUB+ 数据表 4.5 V to 60 V 4.5 V 50 mA 22 uA 100 kHz to 2.2 MHz
发布日期: 2014-10-21 | 更新日期: 2025-09-11