Fairchild Semiconductor FAN5234
The FAN5234 PWM controller provides high efficiency and regulation with an adjustable output from 0.9V to 5.5V that are required to power I/O, chip-sets, memory banks or peripherals in high-performance notebook computers, PDAs and Internet appliances. The hysteretic mode of operation can be disabled if PWM mode is desired for all load levels. The FAN5234 monitors these outputs and generates a PGOOD (power good) signal when the soft-start is completed and the output is within ±10% of its set point.| Part No. | FAN5234 |
|---|---|
| Datasheet | FAN5234 Download |
| Manufacturer |  Fairchild Semiconductor |
| Description | Mobile-Friendly PWM/PFM Controller |
| Buy | Stock & Price |
FEATURES
● Wide input voltage range (2 to 24V) for Mobile systems● Excellent dynamic response with Voltage Feed-Forward and Average Current Mode control
● Lossless current sensing on low-side MOSFET or precision over-current using sense resistor
● VCC Under-voltage Lockout
● Power-Good Signal
● Light load Hysteretic mode maximizes efficiency
● QSOP16, TSSOP16
● 300Khz or 600Khz operation
GENERAL DESCRIPTION
Synchronous rectification and hysteretic operation at light loads contribute to a high efficiency over a wide range of loads. Efficiency is even further enhanced by using MOSFET’s RDS(ON) as a current sense component. Feed-forward ramp modulation, average current mode control, and internal feedback compensation provide fast response to load transients. A built-in over-voltage protection prevents the output voltage from going above 120% of the set point. Normal operation is automatically restored when the overvoltage conditions go away. Under-voltage protection latches the chip off when the output drops below 75% of its set value after the soft-start sequence is completed.
