ML4894ES MICRO-LINEAR [Micro Linear Corporation], ML4894ES Datasheet
ML4894ES
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ML4894ES Summary of contents
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GENERAL DESCRIPTION The ML4894 synchronous buck controller has been designed to provide high efficiency DC/DC conversion for portable products. The ML4894 can deliver a fixed 5V output from input voltages of 5.9V to 15V. The ML4894 drives external P- and ...
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ML4894 PIN CONFIGURATION PIN DESCRIPTION PIN# NAME FUNCTION 1 V Connection point for internal linear REG regulator bypass capacitor 2 V Voltage feedback pin for regulating FB the 5V output 3 I Current sense input SENSE SHDN 4 a logic ...
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ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied ............................................................................................ Peak Driver Output Current ....................................... ±2A ...
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ML4894 FUNCTIONAL DESCRIPTION The ML4894 converts a 5.9V to 15V input to a fixed 5V output using a unique current mode PFM synchronous buck control architecture. The output current is set by external components, and can exceed 2A. Even at ...
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ON OSCILLATOR ONE SHOT S Q SYNCHRONOUS R Q COMPARATOR CURRENT COMPARATOR TRANSCONDUCTANCE AMPLIFIER Figure 1. ML4894 Functional Block Diagram 7 (V) Figure 2. ...
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ML4894 (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 ...
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– For reliable operation, the inductor current rating should exceed the value calculated by 10%-20%. For future reference, determine the peak inductor current at the minimum input voltage PEAK ...
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ML4894 DESIGN CONSIDERATIONS (cont.) INPUT CAPACITOR SELECTION The choice of the input capacitor is based on its ripple current and voltage ratings rather than its capacitance value. The input capacitor should be a low ESR type and located as close ...
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LAYOUT A typical application circuit is shown in Figure 6. Proximity of passive devices and adequate power and ground planes are critical for reliable operation of the circuit. In general, use the top layer for the high current connections and ...
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... ORDERING INFORMATION PART NUMBER ML4894ES © 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 ...