深圳市中立信电子科技有限公司

1 Features

1• Compliant with CISPR25 Class 5 Conducted

Emissions

• Input Voltage Range of 3 V to 5.5 V

• Output Voltage Range of 0.8 V to 4.5 V

• 2-A Output Current per Regulator

• High Switching Frequency: 2.2 MHz (LM26420X)

0.55 MHz (LM26420Y)

• 0.8 V, 1.5% Internal Voltage Reference

• Internal Soft Start

• Independent Power Good and Precision Enable

for Each Output

• Current Mode, PWM Operation

• Thermal Shutdown

• Overvoltage Protection

• Start-up into Prebiased Output Loads

• Regulators are 180° Out of Phase

• Create a Custom Design Using the LM26420 With

the WEBENCH® Power Designer

2 Applications

• Local 5 V to Vcore of FPGAs

• Core Power in HDDs and Set-Top Boxes

• USB Powered Devices

• Powering

3 Description The LM26420 regulator is a monolithic, highefficiency dual PWM step-down DC/DC converter. This device has the ability to drive two 2-A loads with an internal 75-mΩ PMOS top switch and an internal 50-mΩ NMOS bottom switch using state-of-the-art BICMOS technology results in the best power density available. The world-class control circuitry allow on times as low as 30 ns, thus supporting exceptionally high-frequency conversion over the entire 3-V to 5.5- V input operating range down to the minimum output voltage of 0.8 V. Although the operating frequency is high, efficiencies up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low standby current. The LM26420 utilizes current-mode control and internal compensation to provide high performance regulation over a wide range of operating conditions