LM27402

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

The LM27402 voltage-mode control loop incorporates input voltage feed forward to maintain stability throughout the entire input-voltage range. The switching frequency is adjustable from 200 kHz to
1.2 MHz. Dual, high-current, integrated MOSFET drivers support large Q_G, low R_DS(on) power MOSFETs. A power-good indicator provides power-rail-sequencing capability and output fault detection. An adjustable external soft start limits inrush current and provides monotonic output control during start-up. Other features include external tracking of other power supplies, integrated LDO bias supply, and synchronization capability.