TheLM27402SQ/NOPB (购买请点击) is a synchronous voltage mode DC/DC buckcontroller with inductor DCR current sense capability. Sensingthe inductor current eliminates the need to add resistivepowertrain elements which increases overall efficiency andfacilitates accurate continuous current limit sensing. A 0.6V±1% voltage reference enables high accuracy and low voltagecapability at the output. An input operating voltage rangeof 3V to 20V makes the LM27402 suitable for a large varietyof input railsLM27402SQ/NOPB (购买请点击) .
The LM27402 voltage mode control loop incorporates inputvoltage feed-forward to maintain stability throughout the entireinput voltage range. The switching frequency is adjustablefrom 200 kHz to 1.2 MHz. Dual high current integrated NchannelMOSFET drivers support large QGLM27402SQ/NOPB (购买请点击) , low RDS(ON)MOSFETs. A power good indicator provides power rail sequencingcapability and output fault detection. Adjustableexternal soft-start capability limits inrush current and providesmonotonic output control during startup. Other features includeexternal tracking of other power supplies, integratedLDO bias supplyLM27402SQ/NOPB (购买请点击) , and synchronization capability. TheLM27402 is offered in a 16 pin eTSSOP package and a 4 mmx 4 mm 16 pin exposed LLP.
Features
Input operating voltage range of 3V to 20V;
Continuous inductor DCR or shunt resistor current sensing;
0.6V ±1% reference (-40°C to 125°C junctiontemperature);
Output voltage as high as 95% of input voltage;
Integrated MOSFET driversLM27402SQ/NOPB (购买请点击) ;
Internal LDO bias supply;
External clock synchronization;
Adjustable soft-start with external capacitor;
Pre-biased startup capability;
Power supply tracking;
Input voltage feed-forward;
Power good indicator;
Precision enable with hysteresis。
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