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LTM4633 Datenblatt(PDF) 10 Page - Linear Technology |
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LTM4633 Datenblatt(HTML) 10 Page - Linear Technology |
10 / 32 page LTM4633 10 4633f For more information www.linear.com/LTM4633 operaTion Power Module Description The LTM4633 µModule regulator is a high performance triple output nonisolated switching mode DC/DC power supply. It can provide 10A per output with a few exter- nal input and output capacitors. This module provides precisely regulated output voltages programmable via external resistors from 0.8V DC to 1.8V DC (VOUT1 and VOUT2), and 0.8V DC to 5.5V DC (VOUT3) over a 2.375V to 16V input range with control bias on the CNTL_PWR pin, or 4.7V to 16V with control bias tied to VIN. When applying control bias in the range from 4.7V to 5.5V, then connect the bias to CNTL_PWR and INVTCC, otherwise if >5.5V only bias the CNTL_PWR pin. The typical applica- tion schematic is shown in Figure 16. The LTM4633 has three integrated constant-frequency current mode regulators, power MOSFETs, power induc- tors, and other supporting discrete components. The typical switching frequency is 750kHz. For switching noise-sensitive applications, it can be externally syn- chronized from 600kHz to 750kHz. See the Applications Information section. With current mode control and internal feedback loop compensation, the LTM4633 module has sufficient stabil- ity margins and good transient performance with a wide range of output capacitors, even with all ceramic output capacitors. Current mode control provides cycle-by-cycle fast current limit in an overcurrent condition. An internal overvolt- age monitor protects the output voltages in the event of an overvoltage >7.5%. The top MOSFET is turned off and the bottom MOSFET is turned on until the output overvoltage is cleared. There are two temperature moni- tors in the LTM4633. TEMP1 monitors the close relative temperature of channels 1 and 2, and TEMP2 monitors the close relative temperature of channels 2 and 3. The two diode connected PNP transistors are grounded in the module and can be used as general purpose temperature monitors using a device that is designed to monitor the single-ended connection. Pulling any of the RUN pins below 1.3V forces the cor- responding regulator channel into a shutdown state. The TK/SS pins are used for programming the output voltage ramp and voltage tracking during start-up for each of the channels. See the Applications Information section. TheLTM4633isinternallycompensatedtobestableoverall operatingconditions.Table5providesaguidelineforinput and output capacitances for several operating conditions. The LTpowerCAD™ software tool is provided for transient and stability analysis. The VFB pin is used to program the output voltage with a single external resistor to ground. Each of the channels, operate with a 120° phase shift for multiphase operation. VOUT1 and VOUT2 can be combined to provide a single 20A output. The two channels will not be operating 180° phase shift, but 120° phase when combined for a 20A design. So the input RMS current will be higher than a 180° phase shifted design. See the Applications Information section. High efficiency at light loads can be accomplished with selectable Burst Mode operation using the MODE/PLLIN pin. These light load features will accommodate battery operation. Efficiency graphs are provided for light load op- erationintheTypicalPerformanceCharacteristicssection. |
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Ähnliche Beschreibung - LTM4633 |
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