ml4895 Microsemi Corporation, ml4895 Datasheet
ml4895
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ml4895 Summary of contents
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... The ML4895 can deliver a user programmable 2. output from input voltages of 5.9V to 15V. The ML4895 drives external P- and N-channel MOSFETs in a synchronous buck topology, allowing an overall conversion efficiency of greater than 90% over an output current range exceeding three decades, with an output current capability ...
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... Programming pin for setting the FB output voltage 3 I Current sense input SENSE SHDN 4 a logic low on this pin shuts down the regulator and all internal bias circuitry for minimum power consumption 2 ML4895 8-Pin SOIC (S08) V REG DRV I SENSE DRV ...
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... Operating Temperature Range (Note 1) A CONDITIONS T = 25°C A 5.9V < V < 15V IN Line, Temp 5.9V SENSE FB 5.9V < V < 15V 1000 pF, GND SHDN = 0V SHDN = 5V ML4895 ) .................................... 160°C/W JA MIN TYP MAX UNITS 3.29 3.33 3.37 V 1.7 4 mV/V 3.24 3.42 V 1.0 V 3.0 V 100 2.425 2.5 2.575 V -60 ...
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... SHUTDOWN LOGIC The ML4895 is shut down by applying a logic low to the SHDN pin. This prevents switching from occurring and disconnects the load from the input. The supply current in shutdown typically ranges from 0.5µ 3µ ...
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... ON OSCILLATOR ONE SHOT S Q SYNCHRONOUS R Q COMPARATOR CURRENT COMPARATOR TRANSCONDUCTANCE AMPLIFIER Figure 1. ML4895 Functional Block Diagram 7 (V) Figure 2. ON-Time vs. Input Voltage P DRV 7 SHOOT-THRU PROTECTION N DRV 6 RECTIFIER - -7mV I SENSE + 2. OUT = 2.5V V OUT = 3. OUT = 4 ...
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... ML4895 (ONE SHOT) INDUCTOR CURRENT ( Figure 4. One Shot and Synchronous Rectifier Timing DESIGN CONSIDERATIONS A typical design can be implemented by using the following design procedure. Note that this procedure is not intended to give final values, but to give a good starting point, and provide the relationships necessary to make trade-off decisions ...
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... ON resistance - gate charge product provides a good figure of merit by which to compare various MOSFETs, the lower the figure the better. The internal gate drivers of the ML4895 can drive over 100nC of total gate charge, but 60nC to 70nC is a more practical limit to ensure good switching times. ...
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... In high current applications it may necessary to add a small 0.1 F ceramic capacitor to bypass V ML4895. 8 OUTPUT CAPACITOR SELECTION The output capacitors determine the loop stability and the output ripple voltage. Use only low ESR capacitors ...
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... SENSE located as close to the lead of the resistor as possible. The trace length from the sense resistor to the ML4895 should be kept as short as possible and away from switching components and their traces. 2. The trace lengths from the buck regulator’s input ...
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... ORDERING INFORMATION PART NUMBER ML4895ES © Micro Linear 1996 is a registered trademark of Micro Linear Corporation. Products described herein may be covered by one or more of the following patents: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; 5,559,470. Other patents are pending Micro Linear reserves the right to make changes to any product herein to improve reliability, function or design ...