LM3674 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5 | TI.com

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2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5



The LM3674 step-down DC-DC converter is optimized for powering low-voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7 V to 5.5 V. It provides up to 600-mA load current over the entire input voltage range. There are several fixed output voltages and adjustable output voltage versions.

The device offers superior features and performance for mobile phones and similar portable systems. During the Pulse Width Modulation (PWM) mode, the device operates at a fixed-frequency of 2 MHz (typical). Internal synchronous rectification provides high efficiency during the PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typical).

The LM3674 is available in a 5-pin SOT-23 package. A high switching frequency of 2 MHz (typical) allows use of only three tiny external surface-mount components, an inductor and two ceramic capacitors.


  • Input Voltage Range From 2.7 V to 5.5 V
  • 600-mA Maximum Load Current
  • Available in Fixed and Adjustable Output Voltages
    Ranging From 1 V to 3.3 V
  • Operates From a Single Li-Ion Cell Battery
  • Internal Synchronous Rectification for High
  • Internal Soft-Start
  • 0.01-µA Typical Shutdown Current
  • 2-MHz PWM Fixed Switching Frequency (typical)
  • Current Overload Protection and Thermal
    Shutdown Protection

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WEBENCH® Designer LM3674

  Min   Max Range
Vin  V 2.7 to 5.5V
Vout  V 1 to 3.3V
Iout  A ≤ 0.6A
Ambient Temp  °C -40 to 125°C


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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (Max) (A) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Control mode Duty cycle (Max) (%) Operating temperature range (C) Package Group Rating Type Package size: mm2:W x L (PKG)
LM3674 Order now 2.7     5.5     1.1     3.3     0.6     1     1600     2600     0.3     Enable
Synchronous Rectification    
Voltage Mode     100     -30 to 85     SOT-23 | 5     Catalog     Converter     5SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 5)