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LTM4651 Datenblatt(PDF) 12 Page - Linear Technology |
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LTM4651 Datenblatt(HTML) 12 Page - Linear Technology |
12 / 34 page LTM4651 12 4651f For more information www.linear.com/LTM4651 Power Module Description The LTM4651 is a non-isolated switch mode DC/DC power supply. It can provide up to 4A output current with a few external input and output capacitors. Set by a single resistor, RSET, the LTM4651 regulates a negative output voltage, VOUT–. VOUT– can be set to as low as –26.5V to as high as –0.5V. The LTM4651 operates from a positive input supply rail, VIN, between 3.6V and 58V. The LTM4651’s safe operating area is defined by: VIN + |VOUT–| ≤ 58V. The typical application schematic is shown in Figure 32. The output current capability of the LTM4651 is dependent on VIN and VOUT, as indicated in the page 1 graph. Though the LTM4651 is a ground-referred buck converter topology—also known as a two-switch buck- boost converter—it contains built-in level-shift circuitry so that the RUN, CLKIN, and PGOOD pins are conveniently referred to GND (not VOUT–). The LTM4651 contains an integrated constant-frequency current mode regulator, power MOSFETs, power inductor, EMI filter and other supporting discrete components. The nominal switching frequency range is from 400kHz to 3MHz, and the default operating frequency is 400kHz. It can be externally synchronized to a clock, from 250kHz to 3MHz. See the Applications Information section. The LTM4651 supports internal and external control loop compensation. Internal loop compensation is selected by connecting the COMPa and COMPb pins. Using internal loop compensation, the LTM4651 has sufficient stability OPERATION margins and good transient performance with a wide range of output capacitors, even ceramic-only output capacitors. For external loop compensation, see the Ap- plications Information section. LTpowerCAD® is available for transient load step and stability analysis. Input filter and noise cancellation circuitry reduces noise- coupling to the module’s inputs and outputs, ensuring the module’s electromagnetic interference (EMI) meets the limits of EN55022 Class B (see Figures 5 to 8). Pulling the RUN pin below 1.2V forces the LTM4651 into a shutdown state. A capacitor can be applied from ISETa to SVOUT– to program the output voltage ramp-rate; or, the default LTM4651 ramp-rate can be set by connecting ISETa to ISETb; or, voltage tracking can be implemented by interfacing rail voltages to the ISETa pin. See the Ap- plication Information section. Multiphase operation can be employed by applying an external clock source to the LTM4651’s synchronization input, the CLKIN pin. See the Typical Applications section. LDO losses within the module are reduced by connecting EXTVCC to PGND through an RC-filter or by connecting EXTVCC to a suitable voltage source. The LTM4651 also features a spare control pin called VINREG which can be used to reduce the input current draw during input line sag (“brownout”) conditions. Con- nect VINREG to INTVCC when this feature is not needed. |
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