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3-20V, Voltage Mode Synchronous Buck Controller with DCR Current Sensing

Qty Price
1-9 $2.80
10-24 $2.52
25-99 $2.35
100-249 $2.06
250-499 $1.93
500-749 $1.64
750-999 $1.38
1000+ $1.32


  • Wide Input-Voltage Range of 3 V to 20 V
  • Inductor DCR or Shunt Resistor Based Overcurrent Protection
  • 0.6-V Reference With ±1% FB Accuracy Across Full –40°C to 125°C Junction Temperature Range
  • Switching Frequency from 200 kHz to 1.2 MHz
  • Output Voltage as High as 95% of Input Voltage
  • Integrated High-Current MOSFET Drivers
  • Internal VDD Bias Supply LDO Subregulator
  • External Clock Synchronization
  • Adjustable Soft Start With External Capacitor
  • Prebiased Start-up Capability
  • Power Supply Tracking
  • Voltage-Mode Control With Line Feedforward
  • Open-Drain Power-Good Indicator
  • Precision Enable With Hysteresis
  • 16-Pin HTSSOP and WQFN Packages
  • Create a Custom Design Using the LM27402 With the WEBENCH® Power Designer

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Texas Instruments  LM27402MH/NOPB

The LM27402 is a voltage-mode, synchronous, DC/DC step-down controller with losslessinductor DCR current sensing capability. Sensing the inductor current eliminates the need to addresistive powertrain elements, which increases overall efficiency and facilitates accurate,continuous current sensing. A 0.6-V ±1% voltage reference enables high accuracy and low voltagecapability at the output. An input operating voltage range of 3 V to 20 V makes the LM27402suitable for a large variety of input rails.

The LM27402 voltage-mode control loop incorporates input voltage feed forward to maintainstability throughout the entire input-voltage range. The switching frequency is adjustable from 200kHz to
1.2 MHz. Dual, high-current, integrated MOSFET drivers support largeQG, low RDS(on) power MOSFETs. A power-good indicatorprovides power-rail-sequencing capability and output fault detection. An adjustable external softstart limits inrush current and provides monotonic output control during start-up. Other featuresinclude external tracking of other power supplies, integrated LDO bias supply, and synchronizationcapability.