LM26420YSQ/NOPB

The LM26420 regulator is a monolithic high-efficiency dual PWM step-down DC/DC converter. Using BiCMOS technology with internal 75mΩ PMOS high-side switches and internal 50mΩ NMOS low-side switches, the device drives two 2A loads for optimal power density. The control circuit achieves on-times as low as 30ns, enabling excellent high-frequency conversion with a minimum output voltage as low as 0.8V across the full 3V to 5.5V input operating range. Despite the high operating frequency, efficiency of up to 93% is readily achievable. An external shutdown feature provides ultra-low standby current. The LM26420 delivers high-performance regulation across a wide range of operating conditions using current-mode control and internal compensation.

Applications

• FPGA local 5V to Vcore
• HDD and set-top box core power supply
• USB powered devices
• CPU and ASIC core supply and I/O voltage

Key features

• Compliant with CISPR25 Class 5 conducted emission standards
• Input voltage range: 3V to 5.5V
• Output voltage range: 0.8V to 4.5V
• 2A output current per regulator
• High switching frequency: 2.2MHz (LM26420X), 0.55MHz (LM26420Y)
• 0.8V ±1.5% internal voltage reference
• Internal soft-start
• Independent power-good and precision enable per output
• Current mode PWM operation
• Thermal shutdown
• Overvoltage protection
• Start-up into pre-biased output load
• Regulators 180° out of phase
• Create custom designs with LM26420 and its WEBENCH Power Designer