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FAN5234 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FAN5234 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 15 page www.fairchildsemi.com REV. 1.0.10 5/3/04 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 Applications • Mobile PC regulator • Hand-Held PC power General Description 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. 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 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. 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 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. An adjustable over-current function monitors the output current by sensing the voltage drop across the lower MOSFET. Typical Application Figure 1. 1.8V Output Regulator (see Table 2, page 12 for BOM) SW FAN5234 10 C6 L1 Q1B 14 ILIM 1 4 R1 R2 11 VCC +5 D1 +5 15 13 R3 12 C4 8 R5 PGOOD 2 +5 9 ISNS PGND Q1A 6 VSEN LDRV HDRV BOOT VIN C5 C1 1.8V@ 3.5A R4 VIN (BATTERY) = 2 to 24V C2 AGND EN 3 SS1 7 C3 16 FPWM VOUT 5 FAN5234 Mobile-Friendly PWM/PFM Controller |
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