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ML4870CS-3 Datasheet(PDF) 1 Page - Micro Linear Corporation |
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ML4870CS-3 Datasheet(HTML) 1 Page - Micro Linear Corporation |
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1 / 8 page  July 2000 PRELIMINARY ML4870 * High Current Boost Regulator with Load Disconnect 1 GENERAL DESCRIPTION The ML4870 is a continuous conduction boost regulator designed for DC to DC conversion in multiple cell battery power systems. Continuous conduction allows the regulator to maximize output current for a given inductor. The maximum switching frequency can exceed 200kHz, allowing the use of small, low cost inductors. The ML4870 is capable of start-up with input voltages as low as 1.8V, and is available in 5V and 3.3V output versions with an output voltage accuracy of ±3%. An integrated synchronous rectifier eliminates the need for an external Schottky diode and provides a lower forward voltage drop, resulting in higher conversion efficiency. In addtion, low quiescent current and variable frequency operation result in high efficiency even at light loads. The ML4870 requires only a few external components to build a very small regulator capable of achieving conversion efficiencies approaching 85%. The SHDN input allows the user to stop the regulator from switching, and provides complete isolation of the load from the battery. *Some Packages Are Obsolete BLOCK DIAGRAM FEATURES s Guaranteed full load start-up and operation at 1.8V input s Continuous conduction mode for high output current s Pulse Frequency Modulation and internal synchronous rectification for high efficiency s Isolates the load from the input during shutdown s Minimum external components s Low ON resistance internal switching FETs s Low supply current s 5V and 3.3V output versions VL2 5 VOUT 6 + – SHUTDOWN CONTROL 4 SHDN VIN 2 2.4V START-UP 3 GND VL1 1 SYNCHRONOUS RECTIFIER CONTROL BOOST CONTROL SHDN + – + – 8 PWR GND |
Similar Part No. - ML4870CS-3 |
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Similar Description - ML4870CS-3 |
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