LM26420XSQX

• Input voltage range of 3.0V to 5.5V
• The output voltage range is 0.8V to 4.5V
• 2.0A output current, each output
• High switching frequency

• 2.2MHz (LM26420X)

• 0.55MHz（LM26420Y）
• 75mΩPMOS switch
• 50MΩ NMOS switch
• 0.8V, 1.5% internal reference voltage
• Internal soft start
• Independent power supply for each output is good
• Independent accuracy enables each output
• Current mode, PWM operation
• Thermal shutdown
• Overvoltage protection
• Boot into a prebiased output load
• The output is 180° out of phase

illustrate

The LM26420 regulator is a monolithic, high-frequency, dual PWM step-down DC/DC converter in a 16-pin LLP and 20-pin eTSSOP package. It offers all the positive features, provides fast transient response, and precisely adjusts local DC/DC conversion with the smallest possible PCB area. The LM26420 is the smallest external component and easy to use. The driver internally uses 75 mOhm PMOS top switch and internal 50MΩ NMOS bottom switch using state-of-the-art 0.5 micron BiCMOS process technology to achieve optimal power density with the capability of two 2.0A loads. World-class control circuitry allows a low 30ns time, allowing very high conversion frequencies with a minimum output voltage of 0.8V over the entire 3V to 5.5V input voltage range. An internal switching frequency of 550 kHz or 2.2 MHz allows the use of very small surface mount inductors and capacitors. Even with high operating frequencies, efficiencies as high as 93% are easily achievable. Includes external shutdown with ultra-low standby current. The LM26420 uses current mode control and internal compensation to provide high-performance regulation for a wide range of operating conditions. Other features include internal soft-start circuitry to reduce inrush current, pulse pass-through pulse current limiting, thermal shutdown, power good indicator, precision enable, and output overvoltage protection.

apply

• Local 5V Vcore voltage step-down converter
• Power at the core of the hard drive
• Stb
• USB powered devices
• DSL modem
• Power core and I/O voltages are FPGAs, CPLDs, and ASICs