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LM2631 Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LM2631 Datasheet(HTML) 10 Page - National Semiconductor (TI) |
10 / 12 page Application Circuits (Continued) TABLE 1. Components for Typical 2.5V, 300kHz Application Circuits Input Voltage 4.75V to 24V 4.5V to 6V Output Current 4A 10A Application Notebook Desktop Q1 and Q2 Fairchild FDS6680; Siliconix Si4410DY; or International Rectifier IRF7805 Fairchild FDB7030L; or Motorola MTB75N03HDL Inductor L1 Sumida CDRH127-7R6: 7.6 µH, 5.9A Pulse PE-53681: 2.5 µH, 11.4A Input Capacitors 2 x 22µF, 35V Sprague 593D or TPS 2 x 220 µF, 10V Sanyo OS-CON SA Output Capacitors 2 x 220µF, 10V Sprague 593D or TPS 3 x 330 µF, 6.3V Sanyo OS-CON SA Rectifier D1 Motorola MBRS140T3 Motorola MBRS340T3 Sensing Resistor R3 15 m Ω IRC 3x20m Ω IRC Compensation components C8 and R8 R8 = 3.3 K Ω,C8 = 1nF R8 = 4K Ω,C8 = 1nF When the input voltage is low (less than 5V), the bootstrap function cannot deliver enough gate voltage to fully drive the high-side MOSFET on, which increases Rdson, and conse- quently reduces efficiency. An external charge-pump doubler can be added to double the CBOOT pin voltage (see Figure 3). It can also be added to the VIN pin to increase the gate drive voltage at both high-side and low-side MOSFETs. DS100937-4 FIGURE 2. The Typical 2.5V Application Circuit www.national.com 10 |
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