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LM27213MTD Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM27213MTD Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 22 page LM27213 Single Phase Hysteretic Buck Controller General Description The LM27213 is a single-phase synchronous buck regulator controller designed to fully support a portable microproces- sor. On-chip gate drive makes for a compact, single chip solution. Output currents in excess of 25 Amps are possible. The IC employs a current mode hysteretic control mecha- nism. Inductor current is sensed through a low value sense resistor. The LM27213 will operate over an input voltage range of 5V to 30V. The output voltage is programmed through 6 Voltage Identification (VID) pins and ranges from 0.700V to 1.708V in 64 steps. Since the error in the output voltage directly sets the inductor current, the dynamic response to a large, fast load transient is close to a square wave. This is optimal for mode transition requirements. Also, due to the intrinsic input voltage feedfor- ward characteristic of hysteretic control, the line transient response is excellent as well. The IC provides cycle-by-cycle peak current limit, over- voltage protection, and a power good signal. The LM27213 fully supports the Stop CPU and Sleep modes offered by some processors. When enabled, the IC enters a power- saving “diode emulator” mode which helps prolong battery runtime for portable systems. The LM27213 also has a soft start feature for the external adjustment of soft start speed. Features n Ideal load and line transient responses n 5V to 30V input range n On-chip gate drive n Convenient CLK_EN# signal n Input under-voltage lockout n High light-load efficiency n Adjustable analog soft start n Peak current limit n Over-voltage protection n Error correction for good static accuracy n ± 1% DAC accurcy over temperature n Interfaces with the LM2647 system supply n Available in TSSOP or tiny LLP package Applications n Core voltage supply for Low Power Processors n Low voltage high current buck regulators Benefits n Single chip core power solution n Minimum output capacitance required n Low cost, compact design Typical Application 20154330 February 2006 © 2006 National Semiconductor Corporation DS201543 www.national.com |
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