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LM27212SQ Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM27212SQ Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
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1 / 23 page  LM27212 Two-Phase Current-Mode Hysteretic Buck Controller General Description The LM27212 is a two-phase synchronous buck regulator controller that is designed to support high-current loads such as microprocessors. The IC employs a two-phase current-mode hysteretic control mechanism. During normal operation, the two switching channels operate 180˚ out of phase, helping reduce the number of input capacitors. Inductor currents are sensed through low value sense resis- tors. Current sharing between the two channels is automati- cally guaranteed by multiplexing the feedback comparator. The regulator input voltage range supported by the LM27212 is 5V to 30V. The output voltage is programmed through six voltage identification pins and ranges from 0.700V to 1.708V in 64 steps. The IC provides accurate load-line characteristic. The regu- lator can be programmed to lower its output voltage linearly with increasing load current, so that the power generated by the load can be significantly reduced. Since the error in the output voltage directly sets the inductor currents, the dynamic response to a large and fast load transient is close to a square wave. This is optimal for meeting CPU supply voltage specifications. Due to the intrinsic input voltage feed forward characteristic of a peak current-mode controller, the IC has a superior line transient response. The IC provides a cycle-by-cycle peak current limit, over- voltage protection, and a power good signal. The LM27212 fully supports the Stop CPU mode and Sleep mode required by some mobile CPUs. In the Sleep mode, the IC enters single-phase power-saving operation which significantly enhances the light load efficiency. The LM27212 also has a soft start pin for the external adjustment of soft start speed. The LM27212 combined with the LM27222 series of MOS- FET drivers, provides a layout-friendly, thermally optimized and noise-immune power solution for the mobile platform. Features n 5V to 30V input range n Two channels operating 180˚ out of phase n Ideal load and line transient responses n Dynamic output voltage swing supported n Excellent inductor current sharing n High efficiency Sleep mode n Soft start and soft shutdown n Cycle-by-cycle current limit n Adjustable over-voltage protection n Accurate load-line supported n ± 1% reference over temperature n On/off pin and power good signal n TSSOP package or tiny LLP package Applications n Power Supply For Mobile CPUs n Low Output Voltage Buck Regulators Up To 50A Typical Application 20152031 March 2006 © 2006 National Semiconductor Corporation DS201520 www.national.com |
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