LM3477AMM

• 500kHz switching frequency
• Adjustable current limit
• 1.5% benchmark
• Thermal shutdown
• Individual capacitors and resistors optimized for frequency compensation
• Internal soft start
• Current mode operation
• Undervoltage lockout hysteresis
• 8-pin small SO8 (MSOP-8) package

illustrate

The LM3477/A is a high-side N-channel MOSFET switching regulator controller. It can be used in topology requirements such as buck, inversion (buck-boost) and high-side MOSFET Zeta regulation. The LM3477/A's internal push-pull driver allows for a wide range of MOSFET compatibility. For this, the wide input voltage range, discrete power devices and adjustable current limit allow the LM3477/A to be optimized for a wide range of applications.

The LM3477/A uses a high switching frequency of 500kHz to reduce the overall solution size. Current-mode control requires only one resistor and capacitor for frequency compensation. Current mode architectures also feature excellent voltage and load regulation and cycle-by-cycle current limiting. A 5μA shutdown state for power saving and power sequencing. Other features include internal soft-start and overvoltage protection outputs. Internal soft-start reduces inrush current. Overvoltage protection is a safety feature that ensures that the output voltage stays in regulation.

The LM3477A is similar to the LM3477. The main difference between the two is at which point the device transitions to hysteresis mode. The LM3477A hysteresis threshold is one-third of the LM3477.

apply

• Local voltage regulation
• Distributed power
• Laptops and PDAs
• Internet equipment
• Printers and office automation
• Battery-powered devices
• Cable modem
• Battery charger