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NCP176AMX120TCG Datasheet(PDF) 10 Page - ON Semiconductor |
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NCP176AMX120TCG Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 11 page NCP176 www.onsemi.com 10 The power dissipated by the LDO for given application conditions can be calculated by the next equation: P D + VIN @ IGND ) VIN * VOUT @ IOUT [W] (eq. 2) Where IGND is the LDO’s ground current, dependent on the output load current. Connecting the exposed pad and N/C pin to a large ground planes helps to dissipate the heat from the chip. The relation of θJA and PD(MAX) to PCB copper area and Cu layer thickness could be seen on the Figure 30. Reverse Current The PMOS pass transistor has an inherent body diode which will be forward biased in the case when VOUT > VIN. Due to this fact in cases, where the extended reverse current condition can be anticipated the device may require additional external protection. Power Supply Rejection Ratio The LDO features very high power supply rejection ratio. The PSRR at higher frequencies (in the range above 100 kHz) can be tuned by the selection of COUT capacitor and proper PCB layout. A simple LC filter could be added to the LDO’s IN pin for further PSRR improvement. Enable Turn−On Time The enable turn−on time is defined as the time from EN assertion to the point in which VOUT will reach 98% of its nominal value. This time is dependent on various application conditions such as VOUT−NOM, COUT and TA. PCB Layout Recommendations To obtain good transient performance and good regulation characteristics place CIN and COUT capacitors as close as possible to the device pins and make the PCB traces wide. In order to minimize the solution size, use 0402 or 0201 capacitors size with appropriate effective capacitance. Larger copper area connected to the pins will also improve the device thermal resistance. The actual power dissipation can be calculated from the equation above (Power Dissipation section). Exposed pad and N/C pin should be tied to the ground plane for good power dissipation. ORDERING INFORMATION TABLE Part Number Voltage Option Marking Option Package Shipping† NCP176AMX100TCG 1.0 V AA With output discharge XDFN6 (Pb−Free) 3000 / Tape & Reel NCP176AMX120TCG 1.2 V AE NCP176AMX180TCG 1.8 V AF NCP176AMX300TCG 3.0 V AC NCP176AMX330TCG 3.3 V AD NCP176BMX100TCG 1.0 V DA Without output discharge NCP176BMX120TCG 1.2 V DE NCP176BMX180TCG 1.8 V DF NCP176BMX300TCG 3.0 V DC NCP176BMX330TCG 3.3 V DD †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. |
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