MAX1993ETG+

The MAX1993ETG+ from Maxim Integrated Products is a Quick-PWM step down controller with inductor saturation protection and dynamic output voltages in 24 pin TQFN package. It provides high efficiency, excellent transient response and high DC output accuracy. It step down high voltage batteries to generate low voltage CPU core or chipset/RAM supplies in notebook computers. The Quick-PWM™ quick-response, constant on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns 'instant-on' response to load transients while maintaining a relatively constant switching frequency. Single-stage buck conversion allows IC to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion at maximum switching frequency allows minimum possible physical size. It is used at DDR memory termination, active termination buses, CPU/chipset/GPU with dynamic voltage cores applications.

• Input voltage range from 4.5V to 5.5V
• Operating temperature range from -40°C to +85°C
• 2V to 28V battery input range (VIN), optional power good and fault blanking during transitions
• External reference input, dynamically selectable output voltage (0.7V to 5.5V)
• Overvoltage/undervoltage protection option
• 200/300/450/600KHz switching frequency
• 2V ±0.7% reference output, power good window comparator
• Ultra-high efficiency, 1.7ms digital soft-start, inductor saturation protection
• Accurate current limit
• Drives large synchronous rectifier FETs