R1273 系列
14A 34V输入带同步整流器功能的降压DC/DC转换器


  • 概述

    The R1273 is a step-down DC/DC converter which can generate an output voltage of 0.7 V to 5.3 V by driving high- / low-side NMOSs. By the adoption of a unique current mode PWM architecture without an external current sense resistor, the R1273 can make up a stable DC/DC converter with high-efficiency even if adding low Ron MOSFETs and a low DCR inductor externally. And, by the frequency characteristics optimization with using external phase compensation capacitor, the R1273 can achieve a high-speed response to variations of input voltage and load current. The user-settable oscillation frequency is adjustable over a range of 250 kHz to 1 MHz by external resistors, and also can be synchronized to an external clock in a range of 250 kHz to 1 MHz. The R1273 supports three operating modes: Forced PWM mode, PLL_PWM mode, and PWM/VFM Auto-switching mode. These modes are selectable according to conditions of the MODE pin. Especially, the PWM/VFM Auto-switching mode can improve efficiency under light load conditions.

    The R1273 can minimize the output voltage drop caused by an input voltage drop at cranking, with reducing the operating frequency (the lowest possible limit is a quarter of the frequency) so that the off-duty is reduced.

    Protection functions include a current limit function, a hiccup-mode short-circuit protection (non-latch type), a thermal shutdown function, an UVLO (Under Voltage Lock Out) function, an OVD (Over Voltage Detection) function, a soft-start function, a low-inductor current shutdown function, and so on. Also, a power good function provide the status of output with using a power good (PGOOD) pin.

    For EMI reduction, SSCG (Spread-Spectrum Clock Generator) for diffused oscillation frequency at the PWM operation is optionally available. The R1273 is available in QFN0505-32B package.

  • 规格
    消费 工业 车载
    输入电压范围 4.0 V to 34.0 V (36.0 V)
    工作温度范围 -40°C to 105°C (125°C) -40°C to 105°C (125°C) -40°C to 125°C (150°C)
    电源电流 Typ. 15 µA
    待机电流 Typ. 3 µA
    启动电压 4.5 V
    输出电压范围 Externally Adjustable: 0.7 V to 5.3 V
    反馈电压 0.64 V
    反馈电压精度 ±1%
    驱动器导通电阻 High-side: Typ. 11.8 mΩ / Low-side: Typ. 12.3 mΩ
    振荡器频率 Externally Adjustable: 250 kHz to 1 MHz
    封装 QFN0505-32B


    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 vs. Output Current

      Efficiency vs. Output Current

  • 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。



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


分类:DC / DC开关稳压器

拓扑结构 Buck
min (V)
max (V)
min (V)
max (V)