R1224 系列
18.5V输入PWM/VFM降压DC/DC控制器

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  • 概述

    The R1224 Series are low supply current CMOS-based PWM/VFM step-down DC/DC controller with an external output transistor. By simply using a power transistor, an inductor, a diode, and a capacitor as external components, a high-efficiency step-down DC/DC converter can be easily configured. The PWM/VFM alternative circuit automatically switches to VFM control in the smaller output current range and provides high efficiency even in the smaller output current range. The version with fixed PWM control and adjustable output voltage with an external resistor is also available.

    The reset type protection circuit embedded into the device limits output current by repeatedly triggering the soft start circuit when the oscillator maximum duty cycle continues for a predetermined period of time. When the oscillator maximum duty cycle ends, normal operation is resumed automatically. R1224 also includes an under-voltage lockout circuit (UVLO) that stops DC/DC operation and prevents malfunction when the supply voltage falls below the UVLO detect voltage and reduces supply current.

  • 规格
    消费
    输入电压范围 2.3 V to 18.5 V (20.0 V)
    工作温度范围 -40°C to 85°C (125°C)
    电源电流 Typ. 20 µA (R1224Nxx2E/F/L/M、R1224N102M)
    Typ. 30 µA (R1224Nxx2G、R1224N102G)
    Typ. 40 µA (R1224Nxx2H、R1224N102H)
    待机电流 Typ. 0 µA
    输出电压范围 Internally Fixed Ver.: 1.0 V to 6.0 V (0.1 V step)
    Externally Adjustable Ver.: 1.0 V to VIN
    输出电压精度 ±2% (Ta = 25°C)
    输出电压温度系数 Typ. ±100 ppm/°C
    振荡器频率 Typ. 180 kHz (R1224Nxx2L/M、R1224N102M)
    Typ. 300 kHz (R1224Nxx2E/G、R1224N102G)
    Typ. 500 kHz (R1224Nxx2F/H、R1224N102H)
    效率 Typ. 90%
    封装 SOT-23-5

    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
    • R1224Nxx2E/F/G/H/L/M Typical Application

      R1224Nxx2E/F/G/H/L/M Typical Application

      L: 27µH, C1: 10µF, C2: 0.1µF, C3: 47µF, R1: 10Ω

    • R1224N332E Efficiency vs. Output Current

      R1224N332E 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。

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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)
2.3
输入电压
max (V)
18.5
输出电压
min (V)
1.0
输出电压
max (V)
6.0
消费电流
(µA)
20