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FAN5026 Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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FAN5026 Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 17 page 3 www.fairchildsemi.com FAN5026 Rev. 1.0.5 Pin Configurations Pin Definitions Pin Number Pin Name Pin Function Description 1AGND Analog Ground. This is the signal ground reference for the IC. All voltage levels are measured with respect to this pin. 2 27 LDRV1 LDRV2 Low-Side Drive. The low-side (lower) MOSFET driver output. Connect to gate of low-side MOSFET. 3 26 PGND1 PGND2 Power Ground. The return for the low-side MOSFET driver. Connect to source of low-side MOSFET. 4 25 SW1 SW2 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. 5 24 HDRV1 High-Side Drive. High-side (upper) MOSFET driver output. Connect to gate of high-side MOSFET. 6 23 BOOT1 BOOT2 BOOT. Positive supply for the upper MOSFET driver. Connect as shown in Figure 3. 7 22 ISNS1 ISNS2 Current Sense Input. Monitors the voltage drop across the lower MOSFET or external sense resistor for current feedback. 8 21 EN1 EN2 Enable. Enables operation when pulled to logic high. Toggling EN will also reset the regulator after a latched fault condition. These are CMOS inputs whose state is indeterminate if left open. 9 20 GND Ground. These pins should be tied to AGND for proper operation. 10 19 VSEN1 VSEN2 Output Voltage Sense. The feedback from the outputs. Used for regulation as well as PG, under-voltage and over-voltage protection and monitoring. 11 ILIM1 Current Limit 1. A resistor from this pin to GND sets the current limit. 12 17 SS1 SS2 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 5 µA current source. AGND LDRV1 PGND1 SW1 HDRV1 BOOT1 ISNS1 EN1 GND VSEN1 ILIM1 SS1 DDR VIN FAN5026 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 GND VSEN2 ILIM2/REF2 SS2 PG2/REF2OUT PG1 TSSOP-28 θJA = 50°C/W; θJC = 16°C/W. See note below. Note: θJA and θJC values are determined using a 4 layer, 1" square PCB with 1 ounce copper. |
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