FAN5230QSCX Fairchild Semiconductor, FAN5230QSCX Datasheet
FAN5230QSCX
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FAN5230QSCX_NL
FAN5230QSCX_NLTR
FAN5230QSCX_NLTR
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FAN5230QSCX Summary of contents
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FAN5230 System Electronics Regulator for Mobile PCs Features Applications www.fairchildsemi.com Description REV. 2.8.5 10/17/01 ...
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FAN5230 Typical Application 3.3V-ALWAYS@50mA 5V-ALWAYS 3. 5V-ALWAYS@ 50mA SDN3.3 PGOOD Pin Assignments 3.3V-ALWAYS 5V-ALWAYS Pin Description Pin Name Pin Number Pin Function Description VIN 1 Input power. 3.3V-ALWAYS 2 3.3V Always on linear regulator. Load current on ...
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Pin Description (Continued) Pin Name Pin Number Pin Function Description LSD3.3 7 Low-side gate driver for 3.3V. Connect this pin directly to the gate of an N-channel MOSFET. The trace from this pin to the MOSFET gate should be < ...
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FAN5230 Absolute Maximum Ratings Parameter V IN SW, ISEN Pins,SDWN Pin CPUMP, HSD Pins SDN, VFB, V_always pins CPUMP to SW pins, and all other pins The sum of the load currents on pins 2 and 6 must not exceed ...
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Operating Conditions (Continued) Parameter HSD On Output CPUMP GS HSD Off Output LSD On Output 5V-Always GS LSD Off Output Ramp Amplitude, pk-pk Ramp Offset Ramp Gain from V IN Error Amplifier ...
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FAN5230 Operating Conditions (Continued) Parameter Control Functions SDWN Off Voltage Max. SDWN On Voltage Min. Over-temperature Shutdown Over-temperature Hysteresis PGOOD Threshold PGOOD Sink Current PGOOD leakage +5V Analog Softstart +3.3V Analog Softstart Soft Start Current PGOOD Min Pulse ...
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REV. 2.8.5 10/17/01 FAN5230 7 ...
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FAN5230 VREF=2.5V R 16R V out – + VFB12 Figure 2. FAN5230 12V Internal Block Diagram LDO 3.3V ALWAYS 5V ALWAYS Figure 3. FAN5230 5V/3.3V—ALWAYS Internal Block Diagram 8 CK 12V Converter V e Ramp PWM CLK:3 Ramp ...
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Functional Description 3.3V and 5V Architecture 3.3V and 5V PWM Current Sensing 3.3V and 5V PWM Loop Compensation 3.3V and 5V PWM Current Limit REV. 2.8.5 10/17/01 µ µ Precision Current Limit HSD SW LSD ISEN GND Figure 4. Using ...
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FAN5230 MAIN 3.3V and 5V Softstart, Sequencing and Stand-by ALWAYS mode of Operation Sequencing Table 3V&5V SDN5 SDN3.3 SDWN ALWAYS ...
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Under-voltage Protection 12V Architecture 12V Loop Compensation 12V Protection 12V Softstart and Sequencing REV. 2.8.5 10/17/01 5V/3.3V-ALWAYS Operation 5V/3.3V-ALWAYS Protections Power good Vmain Vth PGOOD Tw Figure 5. PGOOD Timing Diagram FAN5230 ...
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FAN5230 Error Amplifier output voltage clamp VFB=0.5V+Vo/8 V RAMP =0.5V+Vin/8 – VREF Vclamp=0.5V+ +Vo/8 +/-0.2V 0.4V 2 Cycles Counter Figure 6. Duty-Cycle Clamp Thermal shutdown ° Generic Mobile System Block Diagram 5V SDN5 3.3V SDN3.3 RC5230 5V-Always PGOOD ...
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Notebook Application Circuit 3.3V@50mA C10 5V@50mA C11 3.3V@ C12, C13 Q2 SDN3.3 C3 +5V R1 PGOOD Figure 8. FAN5230 Notebook Application Circuit Table 1. FAN5230 Application Bill of Materials Reference Manufacturer, Part # C1 ...
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FAN5230 MOSFET Selection Table 2. MOSFET Duty Cycles High-side FET 5.4V out 3.3V .61 5V .43 Low-side FET 5.4V out 3.3V .34 5V .07 Efficiency 100 ...
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Mechanical Dimensions QSOP 24-Lead Inches Millimeters Symbol Min. Max. Min. 0.0532 1.35 A 0.0668 A1 0.0040 0.0098 0.1 A2 0.054 0.062 1.37 b 0.008 0.012 0.20 c 0.0075 0.0098 0.19 D 0.337 0.344 8.55 E 0.150 0.157 3.81 e 0.025 ...
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... FAN5230QSC 24 Lead QSOP DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. ...