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EEFUE0G181R Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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EEFUE0G181R Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 19 page © 2002 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5236 • Rev. 1.3.2 3 Pin Configuration Figure 3. Pin Configuration Pin Definitions Pin # Name Description 1 AGND Analog Ground . This is the signal ground reference for the IC. All voltage levels are measured with respect to this pin. 2 LDRV1 Low-Side Drive . The low-side (lower) MOSFET driver output. Connect to gate of low-side MOSFET. 27 LDRV2 3 PGND1 Power Ground . The return for the low-side MOSFET driver. Connect to source of low-side MOSFET. 26 PGND2 4 SW1 Switching Node . Return for the high-side MOSFET driver and a current sense input. Connect to source of high-side MOSFET and low-side MOSFET drain. 25 SW2 5 HDRV1 High-Side Drive . High-side (upper) MOSFET driver output. Connect to gate of high-side MOSFET. 24 HDRV2 6 BOOT1 BOOT . Positive supply for the upper MOSFET driver. Connect as shown in Figure 4. 23 BOOT2 7 ISNS1 Current-Sense Input . Monitors the voltage drop across the lower MOSFET or external sense resistor for current feedback. 22 ISNS2 8 EN1 Enable . Enables operation when pulled to logic HIGH. Toggling EN resets the regulator after a latched fault condition. These are CMOS inputs whose state is indeterminate if left open. 21 EN2 9 FPWM1 Forced PWM Mode . When logic LOW, inhibits the regulator from entering Hysteretic Mode; otherwise tie to VOUT. The regulator uses VOUT on this pin to ensure a smooth transition from Hysteretic Mode to PWM Mode. When VOUT is expected to exceed VCC, tie to VCC. 20 FPWM2 10 VSEN1 Output Voltage Sense . The feedback from the outputs. Used for regulation as well as PG, under-voltage, and over-voltage protection and monitoring. 19 VSEN2 11 ILIM1 Current Limit 1 . A resistor from this pin to GND sets the current limit. 12 SS1 Soft Start . A capacitor from this pin to GND programs the slew rate of the converter during initialization. During initialization, this pin is charged with a 5mA current source. 17 SS2 AGND LDRV1 PGND1 SW1 HDRV1 BOOT1 ISNS1 EN1 FPWM1 VSEN1 ILIM1 SS1 DDR VIN FAN5236 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC LDRV2 PGND2 SW2 HDRV2 BOOT2 ISNS2 EN2 FPWM2 VSEN2 ILIM2/REF2 SS2 PG2/REF2OUT PG1 |
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