The FAN5099 combines a high-efficiency pulse-width modulated (PWM) controller and an LDO (Low DropOut) linear regulator controller. The PWM controller is designed to operate over a wide frequency range (50kHz to 600kHz) to accommodate a variety of applications. Synchronous rectification provides high efficiency over a wide range of load currents. Efficiency is further enhanced by using the low-side MOSFET’s R_DS(ON) to sense current. In addition, the capability to operate at low switching frequencies provides opportunities to boost power supply efficiency by reducing switching losses and gain cost savings using low-cost materials, such as powdered iron cores, on the output inductor.

Both the linear and PWM regulator soft-start are controlled by a single external capacitor, to limit in rush current from the supply when the regulators are first enabled. Current limit for PWM is also programmable.

The FAN5099's ability to handle wide input voltage ranges makes this controller suitable for power solutions in a wide range of applications involving conversion input voltages from Silver box, battery, and adapters. The PWM regulator employs a summing-current-mode control with external compensation to achieve fast load transient response and provide system design optimization.

FAN5099 is offered in both industrial temperature grade (-40°C to +85°C) as well as commercial temperature grade (-10°C to +85°C).

• General Purpose PWM Regulator and LDO Controller
• Input Voltage Range: 3V to 24V
• Output Voltage Range: 0.8V to 15V
• V_CC
  • 5V
  • Shunt Regulator for 12V Operation
• Support for Ceramic Cap on PWM Output
• Programmable Current Limit for PWM Output
• Wide Programmable Switching Frequency Range (50kHz to 600kHz)
• R_DS(ON) Current Sensing
• Internal Synchronous Boot Diode
• Soft-Start for both PWM and LDO
• Multi-Fault Protection with Optional Auto-restart
• 16-pin TSSOP Package

• High-Efficiency (80+) Computer Power Supplies
• PC/Server Motherboard Peripherals
  • V_CC_MCH (1.5V), V_DDQ (1.5V) and V_{TT_GTL} (1.25V)
• Power Supply for FPGA, DSP, Embedded Controllers, Graphic Card Processor, and Communication Processors
• High-Power DC-to-DC Converters