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AC/DC & DC/DC controllers (external FET)

UC3573

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降压脉宽调制器步降稳压器

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UC3573

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产品详情

Vin (min) (V) 4.2 Vin (max) (V) 35 Iout (max) (A) 0.5 Operating temperature range (°C) 0 to 70 Rating Catalog Vout (min) (V) 1.5 Vout (max) (V) 30 Iq (typ) (A) 0.009 Duty cycle (max) (%) 100
Vin (min) (V) 4.2 Vin (max) (V) 35 Iout (max) (A) 0.5 Operating temperature range (°C) 0 to 70 Rating Catalog Vout (min) (V) 1.5 Vout (max) (V) 30 Iq (typ) (A) 0.009 Duty cycle (max) (%) 100
SOIC (D) 8 29.4 mm² 4.9 x 6
  • Simple Single Inductor Buck PWM Stepdown Voltage Regulation
  • Drives External PMOS Switch
  • Contains UVLO Circuit
  • Includes Pulse-by-Pulse Current Limit
  • Low 50µA Sleep Mode Current
  • Simple Single Inductor Buck PWM Stepdown Voltage Regulation
  • Drives External PMOS Switch
  • Contains UVLO Circuit
  • Includes Pulse-by-Pulse Current Limit
  • Low 50µA Sleep Mode Current

The UC3573 is a Buck pulse width modulator which steps down and regulates a positive input voltage. The chip is optimized for use in a single inductor buck switching converter employing an external PMOS switch. The block diagram consists of a precision reference, an error amplifier configured for voltage mode operation, an oscillator, a PWM comparator with latching logic, and a 0.5A peak gate driver. The UC3573 includes an undervoltage lockout circuit to insure sufficient input supply voltage is present before any switching activity can occur, and a pulse-by-pulse current limit. Input current can be sensed and limited to a user determined maximum value. In addition, a sleep comparator interfaces to the UVLO circuit which turns the chip off when the input voltage is below the UVLO threshold. This reduces the supply current to only 50uA, making the UC3573 ideal for battery powered applications.

The UC3573 is a Buck pulse width modulator which steps down and regulates a positive input voltage. The chip is optimized for use in a single inductor buck switching converter employing an external PMOS switch. The block diagram consists of a precision reference, an error amplifier configured for voltage mode operation, an oscillator, a PWM comparator with latching logic, and a 0.5A peak gate driver. The UC3573 includes an undervoltage lockout circuit to insure sufficient input supply voltage is present before any switching activity can occur, and a pulse-by-pulse current limit. Input current can be sensed and limited to a user determined maximum value. In addition, a sleep comparator interfaces to the UVLO circuit which turns the chip off when the input voltage is below the UVLO threshold. This reduces the supply current to only 50uA, making the UC3573 ideal for battery powered applications.
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类型 标题 下载最新的英语版本 日期
* 数据表 Buck Pulse Width Modulator Stepdown Voltage Regulator 数据表 (Rev. A) 2010年 7月 15日
应用手册 DN-70 UC3573 Buck Regulator PWM Control IC - Typical Application Circuit 1999年 9月 5日

设计和开发

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封装 引脚 下载
SOIC (D) 8 查看选项
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订购和质量

包含信息：
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
包含信息：
  • 制造厂地点
  • 封装厂地点

支持和培训

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