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LT3837 Datasheet(PDF) 10 Page - Linear Technology |
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LT3837 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 24 page  LTM4600 10 4600fc the module input pins in the PCB layout to minimize the trace inductance and high frequency AC noise. Output Capacitors The LTM4600 is designed for low output voltage ripple. The bulk output capacitors COUT is chosen with low enough effective series resistance (ESR) to meet the output voltage ripple and transient requirements. COUT can be low ESR tantalum capacitor, low ESR polymer capacitor or ceramic capacitor (X5R or X7R). The typical capacitance is 200μF if all ceramic output capacitors are used. The internally optimized loop compensation provides sufficient stability margin for all ceramic capacitors applications. Additional output filtering may be required by the system designer, if further reduction of output ripple or dynamic transient spike is required. Refer to Table 2 for an output capaci- tance matrix for each output voltage Droop, peak to peak deviation and recovery time during a 5A/μs transient with a specific output capacitance. Fault Conditions: Current Limit and Over current Foldback The LTM4600 has a current mode controller, which inher- ently limits the cycle-by-cycle inductor current not only in steady state operation, but also in transient. To further limit current in the event of an over load condi- tion, the LTM4600 provides foldback current limiting. If the output voltage falls by more than 50%, then the maximum output current is progressively lowered to about one sixth of its full current limit value. Soft-Start and Latchoff with the RUN/SS pin The RUN/SS pin provides a means to shut down the LTM4600 as well as a timer for soft-start and over-cur- rent latchoff. Pulling the RUN/SS pin below 0.8V puts the LTM4600 into a low quiescent current shutdown (IQ ≤ 75μA). Releasing the pin allows an internal 1.2μA cur- rent source to charge up the timing capacitor CSS. Inside LTM4600, there is an internal 1000pF capacitor from RUN/ SS pin to ground. If RUN/SS pin has an external capacitor CSS_EXT to ground, the delay before starting is about: tDELAY = 1.5V 1.2 μA •(CSS_EXT + 1000pF) When the voltage on RUN/SS pin reaches 1.5V, the LTM4600 internal switches are operating with a clamping of the maximum output inductor current limited by the RUN/SS pin total soft-start capacitance. As the RUN/SS pin voltage rises to 3V, the soft-start clamping of the inductor current is released. VIN to VOUT Step-Down Ratios There are restrictions in the maximum VIN to VOUT step down ratio that can be achieved for a given input voltage. These contraints are shown in the Typical Performance Characteristics curves labeled “VIN to VOUT Step-Down Ratio”. Note that additional thermal derating may apply. See the Thermal Considerations and Output Current Derating sections of this data sheet. After the controller has been started and given adequate APPLICATIONS INFORMATION |
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