R1278 系列
2A 30V输入带同步整流器功能的PWM降压DC/DC转换器

  • 概述

    The R1278 is a 36 V maximum rated synchronous step-down DC/DC converter with built-in drivers.

    With the operating frequency at 2 MHz and a spread-spectrum clock generator, the interference effect on the AM band is small. When an input voltage drops, the switching frequency is automatically reduced to keep output voltage level constant.

    特点

    • Provides a high switching frequency at 2 MHz with the efficiency of 87%.
    • Maintains the output voltage constant when an input voltage drops by reducing a switching frequency to the minimum of 1/4.
    • Achieves the EMI noise reduction by using a spread spectrum clock generator. (Diffusion Rate: +10%).

  • 规格
    消费 工业 车载
    输入电压范围 3.6 V to 30.0 V (36.0 V)
    工作温度范围 -40°C to 105°C (125°C) -40°C to 125°C (150°C) -40°C to 125°C (150°C)
    电源电流 Typ. 1 mA
    待机电流 Typ. 4 µA
    启动电压 4.5 V
    输出电压范围 Externally Adjustable: 3.3 V to 5.0 V
    反馈电压 0.64 V
    反馈电压精度 ±1.0%
    输出电流 2 A
    驱动器导通电阻 High side: Typ. 0.145 Ω, Low side: Typ. 0.095 Ω
    振荡器频率 Typ. 2 MHz
    封装 HSOP-18

    保护回路/功能

    TSD ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust
  • 技术资料
    • Typical Application

      Typical Application
    • Efficiency (VOUT=5V)

      Efficiency (VOUT=5V)

  • 品质&封装
    • 有关产品的详细信息,请参见数据表。
    • 封装文件包括封装尺寸,卷带规格,卷带盘尺寸,功耗和建议的焊盘图案。
    • 请联系我们或我们的代理商以获取未发布的可靠性信息。

下载数据表

功能说明

TSD 热关断电路
ILX LX Current Limit Function
OCP 过流保护
OVP 过压保护
UVLO 欠压锁定功能
OVLO Overvoltage Lockout Protection
Reverse 反向电流保护电路
Shutdown 关机功能
Soft Start 软启动功能
SSCG Spread Spectrum Clock Generator Function
PGOOD Power Good Output
Auto Discharge 自动放电功能
Anti-ringing Anti-ringing Switch Function
Sequencing Start-up Sequencing Control
Max Duty 最大占空比
Ext. Phase 外部可调相位补偿
LED Adjust LED High-speed Dimming Control

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分类:DC / DC开关稳压器

拓扑结构 Buck
输入电压
min (V)
3.6
输入电压
max (V)
30.0
输出电压
min (V)
3.3
输出电压
max (V)
5.0
输出电流
(mA)
2000
消费电流
(µA)
1000