LM27402 Series
3-V to 20-V, voltage mode synchronous buck controller with DCR current sensing
Manufacturer: Texas Instruments
Catalog
3-V to 20-V, voltage mode synchronous buck controller with DCR current sensing
Key Features
• Wide Input-Voltage Range of 3 V to 20 VInductor DCR or Shunt Resistor Based Overcurrent Protection0.6-V Reference With ±1% FB Accuracy Across Full –40°C to 125°C Junction Temperature RangeSwitching Frequency from 200 kHz to 1.2 MHzOutput Voltage as High as 95% of Input VoltageIntegrated High-Current MOSFET DriversInternal VDD Bias Supply LDO SubregulatorExternal Clock SynchronizationAdjustable Soft Start With External CapacitorPrebiased Start-up CapabilityPower Supply TrackingVoltage-Mode Control With Line FeedforwardOpen-Drain Power-Good IndicatorPrecision Enable With Hysteresis16-Pin HTSSOP and WQFN PackagesCreate a Custom Design Using the LM27402 With theWEBENCH®Power DesignerWide Input-Voltage Range of 3 V to 20 VInductor DCR or Shunt Resistor Based Overcurrent Protection0.6-V Reference With ±1% FB Accuracy Across Full –40°C to 125°C Junction Temperature RangeSwitching Frequency from 200 kHz to 1.2 MHzOutput Voltage as High as 95% of Input VoltageIntegrated High-Current MOSFET DriversInternal VDD Bias Supply LDO SubregulatorExternal Clock SynchronizationAdjustable Soft Start With External CapacitorPrebiased Start-up CapabilityPower Supply TrackingVoltage-Mode Control With Line FeedforwardOpen-Drain Power-Good IndicatorPrecision Enable With Hysteresis16-Pin HTSSOP and WQFN PackagesCreate a Custom Design Using the LM27402 With theWEBENCH®Power Designer
Description
AI
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 to1.2 MHz. Dual, high-current, integrated MOSFET drivers support large QG, low RDS(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.
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 to1.2 MHz. Dual, high-current, integrated MOSFET drivers support large QG, low RDS(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.
