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FAN5234

ON Semiconductor
Part Number FAN5234
Manufacturer ON Semiconductor
Description Dual Mobile-Friendly PWM/PFM Controller
Published Oct 30, 2022
Detailed Description Dual Mobile-Friendly PWM/PFM Controller FAN5234 Description The FAN5234 PWM controller provides high efficiency and reg...
Datasheet PDF File FAN5234 PDF File

FAN5234
FAN5234

Overview
Dual Mobile-Friendly PWM/PFM Controller FAN5234 Description The FAN5234 PWM controller provides high efficiency and regulation with an adjustable output from 0.
9 V to 5.
5 V required to power I/O, chip−sets, memory banks, or peripherals in high−performance notebook computers, PDAs, and Internet appliances.
Synchronous rectification and hysteretic operation at light loads contribute to a high efficiency over a wide range of loads.
The Hysteretic Mode of operation can be disabled if PWM Mode is desired for all load levels.
Efficiency is further enhanced by using the 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.
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.
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 over−voltage conditions cease.
Under−voltage protection latches the chip off when the output drops below 75% of its set value after the soft− start sequence is completed.
An adjustable over−current function monitors the output current by sensing the voltage drop across the lower MOSFET.
Features • Wide Input Voltage Range for Mobile Systems: 2 V to 24 V • Excellent Dynamic Response with Voltage Feed−Forward and Average−Current−Mode Control • Lossless Current Sensing on Low−Side MOSFET or Precision Over−Current via Sense Resistor • VCC Under−Voltage Lockout • Power−Good Signal • Light−Load Hysteretic Mode Maximizes Efficiency • 300 kHz or 600 kHz Operation • Operating Temperature Range: −10°C to +85°C • TSSOP16 Package • This is a Pb−Free Device Applications • Mobile PC Regulator • Handheld PC Power Related Resources • Application Note − AN−6002 Component Calculations and Simulation Tools for FAN5234 or FAN5236 • Applic...


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