IR3637SPBF

IR3637SPBF

  • 厂商:

    IRF

  • 封装:

  • 描述:

    IR3637SPBF - 1% ACCURATE SYNCHRONOUS PWM CONTROLLER - International Rectifier

  • 详情介绍
  • 数据手册
  • 价格&库存
IR3637SPBF 数据手册
Data Sheet No. PD94713 IR3637SPBF 1% ACCURATE SYNCHRONOUS PWM CONTROLLER FEATURES 0.8V Reference Voltage Operates with a single 5V Supply Voltage Internal 400kHz Oscillator Soft-Start Function Fixed Frequency Voltage Mode Short Circuit Protection DESCRIPTION The IR3637 controller IC is designed to provide a simple synchronous Buck regulator for on-board DC to DC applications in a small 8-pin SOIC. The output voltage can be precisely regulated using the internal 0.8V reference voltage for low voltage applications. The IR3637 operates at a fixed internal 400kHz switching frequency to reduce the component size. The device features under-voltage lockout for both input supplies, an external programmable soft-start function as well as output under-voltage detection that latches off the device when an output short is detected. APPLICATIONS Computer Peripheral Voltage Regulator Memory Power supplies Graphics Card Low cost on-board DC to DC TYPICAL APPLICATION 12V C3 5V C2 C1 Vc Vcc HDrv Q1 D1 L1 Vout Q2 C6 SS/SD C4 IR3637 LDrv Comp Fb Gnd R1 C5 R3 R2 Figure 1 - Typical application of IR3637. ORDERING INFORMATION PKG DESIG S S PACKAGE PIN PARTS PARTS T&R DESCRIPTION COUNT PER TUBE PER REEL Oriantation IR3637SPBF 8 95 -----Fig A IR3637STRPBF 8 ------2500 Rev. 1.1 06/16/05 www.irf.com 1 IR3637SPBF ABSOLUTE MAXIMUM RATINGS Vcc Supply Voltage ................................................ Vc Supply Voltage .................................................. Storage Temperature Range ..................................... Operating Junction Temperature Range ..................... ESD Classification ................................................. Moisture Sensitivity Level ........................................ 16V 25V -65°C To 150°C 0°C To 125°C HMB Class 2 (2KV) JEDEC Standard JEDEC Level 1 @ 260°C Caution: Stresses above those listed in “Absolute Maximum Rating” may cause permanent damage to the device. These are stress ratings only and function of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to “Absolute Maximum Rating” conditions for extended periods may affect device reliability PACKAGE INFORMATION Fb 1 Vcc 2 LDrv 3 Gnd 4 8 SS/SD 7 Comp 6 Vc 5 HDrv Recommended Operating Conditions Parameter Vcc Vc Min 4.5 8 Max 5.5 14 Units V V θJA=154°C/W θJC=41.2°C/W ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over Vcc=5V, Vc=12V and 0°C
IR3637SPBF
1. 物料型号: - 型号:IR3637SPBF - 封装:SOIC, NARROW BODY, 8-Pin Surface Mount

2. 器件简介: - IR3637控制器IC设计用于提供简单的同步Buck调节器,用于板上DC到DC应用。 - 输出电压可以通过内部0.8V参考电压精确调节,适用于低电压应用。 - 该器件在固定的400kHz开关频率下工作,以减小组件尺寸。

3. 引脚分配: - 1号引脚(Fb):连接到开关调节器的输出,通过电阻分压器设置输出电压并提供反馈至误差放大器。 - 2号引脚(Vcc):为IC内部模块提供偏置,并为低端驱动器供电。 - 3号引脚(LDrv):同步功率MOSFET的输出驱动器。 - 4号引脚(Gnd):IC的地引脚。 - 5号引脚(HDrv):高端功率MOSFET的输出驱动器。 - 6号引脚(Vc):必须至少比总线电压高4V的电压,用于驱动高端输出驱动器。 - 7号引脚(Comp):误差放大器的补偿引脚。 - 8号引脚(SS/SD):提供用户可编程的软启动功能。

4. 参数特性: - 参考电压:0.8V - 工作电源电压:单5V供电 - 内部振荡器频率:400kHz - 软启动功能 - 固定频率电压模式 - 短路保护

5. 功能详解: - IR3637是一个固定频率、电压模式的同步控制器,包括一个精密参考电压源、一个误差放大器、内部振荡器、PWM比较器、0.5A峰值门驱动器、软启动和关闭电路。 - 输出电压由误差放大器的输出控制,这是感应到的输出电压和参考电压的放大误差信号。

6. 应用信息: - 计算机外设电压调节器 - 存储器电源 - 图形卡 - 低成本板上DC到DC转换

7. 封装信息: - SOIC封装,8引脚,窄体,表面贴装。
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