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TC1303B Datasheet(PDF) 15 Page - Microchip Technology |
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TC1303B Datasheet(HTML) 15 Page - Microchip Technology |
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15 / 30 page  © 2005 Microchip Technology Inc. DS21949A-page 15 TC1303B 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE 3.1 LDO Shutdown Input Pin (SHDN2) SHDN2 is a logic level input used to turn the LDO Reg- ulator on and off. A logic high (> 45% of VIN), will enable the regulator output. A logic low (< 15% of VIN) will ensure that the output is turned off. 3.2 LDO Input Voltage Pin (VIN2) VIN2 is a LDO power input supply pin. Connect variable input voltage source to VIN2. Connect VIN1 and VIN2 together with board traces as short as possible. VIN2 provides the input voltage for the LDO regulator. An additional capacitor can be added to lower the LDO regulator input ripple voltage. 3.3 LDO Output Voltage Pin (VOUT2) VOUT2 is a regulated LDO output voltage pin. Connect a 1 µF or larger capacitor to VOUT2 and AGND for proper operation. 3.4 Power-Good Output Pin (PG) PG is an output level indicating that VOUT2 (LDO) is within 94% of regulation. The PG output is configured as a push-pull for the TC1303B. 3.5 Analog Ground Pin (AGND) AGND is the analog ground connection. Tie AGND to the analog portion of the ground plane (AGND). See the physical layout information in Section 5.0 “Application Circuits/Issues” for grounding recommendations. 3.6 Buck Regulator Output Sense Pin (VFB/VOUT1) For VOUT1 adjustable output voltage options, connect the center of the output voltage divider to the VFB pin. For fixed-output voltage options, connect the output of the buck regulator to this pin (VOUT1). 3.7 Buck Regulator Shutdown Input Pin (SHDN1) SHDN1 is a logic level input used to turn the buck regulator on and off. A logic-high (> 45% of VIN), will enable the regulator output. A logic-low (< 15% of VIN) will ensure that the output is turned off. 3.8 Buck Regulator Input Voltage Pin (VIN1) VIN1 is the buck regulator power input supply pin. Connect a variable input voltage source to VIN1. Connect VIN1 and VIN2 together with board traces as short as possible. 3.9 Buck Inductor Output Pin (LX) Connect LX directly to the buck inductor. This pin carries large signal-level current; all connections should be made as short as possible. 3.10 Power Ground Pin (PGND) Connect all large-signal level ground returns to PGND. These large-signal, level ground traces should have a small loop area and length to prevent coupling of switching noise to sensitive traces. Please see the physical layout information supplied in Section 5.0 “Application Circuits/Issues” for grounding recommendations. 3.11 Exposed Pad (EP) For the DFN package, connect the EP to AGND with vias into the AGND plane. Pin No. Name Function 1 SHDN2 Active Low Shutdown Input for LDO Output Pin 2VIN2 Analog Input Supply Voltage Pin 3VOUT2 LDO Output Voltage Pin 4 PG Power-good Output Pin 5AGND Analog Ground Pin 6VFB / VOUT1 Buck Feedback Voltage (Adjustable Version) / Buck Output Voltage (Fixed Version) Pin 7 SHDN1 Active Low Shutdown Input for Buck Regulator Output Pin 8VIN1 Buck Regulator Input Voltage Pin 9LX Buck Inductor Output Pin 10 PGND Power Ground Pin EP Exposed Pad For the DFN package, the center exposed pad is a thermal path to remove heat from the device. Electrically this pad is at ground potential and should be connected to AGND. |
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