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SCP51460SN33T1G Datasheet(PDF) 5 Page - ON Semiconductor |
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SCP51460SN33T1G Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 6 page SCP51460 http://onsemi.com 5 APPLICATIONS INFORMATION Input Decoupling Capacitor (CIN) A ceramic or tantalum 0.1 mF capacitor is recommended and should be connected close to the SCP51460 package. Higher capacitance and lower ESR will improve the overall line transient response. Output Decoupling Capacitor (COUT) The SCP51460 does not require any output capacitance to be stable. With no capacitor at the output the device will have faster VOUT rise time and will occupy less PCB space. In some applications however the output capacitor could be added. This will improve the overall transient response. During the transients capacitors with low ESR (e.g. Ceramic capacitors) will cause more ringing than the Tantalum or Aluminum Capacitors. SCP51460 GND 3.3 V CIN 0.1 mF VIN = 4.2 to 28 V VIN VOUT VOUT COUT (3.3 V fixed) Table 6 shows the maximum capacitance of COUT for various load currents to avoid instability. Table 6. IOUT = 100 mA IOUT = 1 mA IOUT = 10 mA IOUT = 20 mA >10 mF >10 mF 1 mF 0.68 mF Thermal Characteristics As power dissipation in the SCP51460 increases, it may become necessary to provide some thermal relief. The maximum power dissipation supported by the device is dependent upon board design and layout. The board material and the ambient temperature affect the rate of junction temperature rise for the part. The maximum power dissipation the SCP51460 can handle is given by: PD(MAX) + [TJ(MAX) * TA] RqJA (eq. 1) Since TJ is not recommended to exceed 100°C (TJ(MAX)), then the SCP51460 can dissipate up to 305 mW when the ambient temperature (TA) is 25°C. The power dissipated by the SCP51460 can be calculated from the following equations: PD [ Vin(IGND@Iout) ) Iout(Vin * Vout) (eq. 2) or Vin(MAX) [ PD(MAX) ) (Vout @ Iout) Iout ) IGND (eq. 3) Hints Vin and GND printed circuit board traces should be as wide as possible. When the impedance of these traces is high, there is a chance to pick up noise or cause the regulator to malfunction. Place external components, especially the output capacitor, as close as possible to the SCP51460, and make traces as short as possible. ORDERING INFORMATION Device Device Code Package Shipping† SCP51460SN33T1G D46 SOT23−3 (Pb−Free) 3,000 / Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. |
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