전자부품 데이터시트 검색엔진 |
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LM2633 데이터시트(PDF) 1 Page - National Semiconductor (TI) |
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LM2633 데이터시트(HTML) 1 Page - National Semiconductor (TI) |
1 / 40 page LM2633 Advanced Two-Phase Synchronous Triple Regulator Controller for Notebook CPUs General Description The LM2633 is a feature-rich IC that combines three regu- lator controllers - two current mode synchronous buck regu- lator controllers and a linear regulator controller. The two switching regulator controllers operate 180˚ out of phase. This feature reduces the input ripple RMS current, resulting in a smaller input filter. The first switching controller (Channel 1) features an Intel mobile CPU compatible precision 5-bit digital-to-analog con- verter which programs the output voltage from 0.925V to 2.00V. It is also compatible with the dynamic VID require- ments. The second switching controller (Channel 2) is ad- justable between 1.25V to 6.0V. Use of synchronous rectification and pulse-skip operation at light load achieves high efficiency over a wide load range. Fixed-frequency operation can be obtained by disabling the pulse-skip mode. Current-mode feedback control assures excellent line and load regulation and a wide loop bandwidth for good re- sponse to fast load transient events. Current mode control is achieved through sensing the Vds of the top FET and thus an external sense resistor is not necessary. A power good signal is available to indicate the general health of the output voltages. A unique feature is the analog soft-start for the switching controllers is independent of the slew rate of the input volt- age. This will make the soft start behavior more predictable and controllable. An internal 5V rail is available externally for boot-strap circuitry (only) when no 5V is available from other sources. Current limit for either of the two switching channels is achieved through sensing the top FET V DS and the value is adjustable. The two switching controllers have under-voltage and over-voltage latch protections, and the linear regulator has under-voltage latch protection. Under-voltage latch can be disabled or delayed by a programmable amount of time. The input voltage for the switching channels ranges from 5V to 30V, which makes possible the choice of different battery chemistries and options. Features GENERAL n Three regulated output voltages n 4.5V to 30V input range n Power good function n Input under-voltage lockout n Thermal shutdown n Tiny TSSOP package SWITCHING SECTION n Two channels operating 180˚ out of phase n Separate on/off control for each channel n Current mode control without sense resistor n Skip-mode operation available n Adjustable cycle-by-cycle current limit n Negative current limit n Analog soft start independent of input voltage slew rate n Power ground pins separate n Output UVP and OVP n Programmable output UVP delay n 250kHz switching frequency (for Vin < 17V) n Channel 1 output from 0.925V to 2.00V n ± 1.5% DAC accuracy from 0˚C to 125˚C n ± 1.7% initial tolerance for Channel 2 n Dynamic VID change ready n Power good flags VID changes n Channel 2 output from 1.3V to 6.0V LINEAR SECTION n Output voltage adjustable n 50mA maximum driving current n Output UVP n ± 2% initial tolerance Applications n Power supply for CPUs of notebook PCs that require the SpeedStep™ technique n Power supply for information appliances n General low voltage DC/DC buck regulators SpeedStep™ is a trademark of Intel Corporation. August 2001 © 2001 National Semiconductor Corporation DS200008 www.national.com |
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유사한 설명 - LM2633 |
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