Texas Instruments LM3477AMM

Description
The LM3477/A is a high-side N-channel MOSFET switching regulator controller. It is suitable for topologies requiring a high-side MOSFET, such as buck, inverting (buck-boost), and zela regulators. The LM3477/A's internal push-pull driver allows compatibility with a wide range of MOSFETs. The wide input voltage range, use of discrete power components, and adjustable current limit enable optimization for various applications.
The LM3477/A operates at a high switching frequency of 500kHz, reducing the overall solution size. Current-mode control requires only a single resistor and capacitor for frequency compensation. This architecture provides superior line and load regulation and cycle-by-cycle current limiting. A 5pA shutdown state allows for power savings and power supply sequencing. Other features include internal soft-start and output overvoltage protection.

Features
500kHz switching frequency
Adjustable current limit
1.5% reference
Frequency compensation optimized with a single capacitor and resistor
Internal soft-start
Current-mode operation
Undervoltage lockout with hysteresis
8-lead Mini-S08 (MSOP-8) package

Applications
Local voltage regulation
Distributed power
Notebook and palmtop computers
Internet appliances
Printers and office automation
Battery-operated devices
Cable modems
Battery chargers