ml4870 Microsemi Corporation, ml4870 Datasheet
ml4870
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ml4870 Summary of contents
Page 1
... 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 ± ...
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... FUNCTION 1 V Boost inductor connection Battery input voltage IN 3 GND Ground 4 SHDN Pulling this pin to V regulator, isolating the load from the input 2 ML4870 8-Pin SOIC (S08 PWR GND GND SHDN OUT TOP VIEW ...
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... IL V Input High Voltage IH Input Bias Current Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions. OPERATING CONDITIONS Temperature Range ML4870CS-X .............................................. 0°C to 70°C ML4870ES-X ........................................... -20°C to 70°C V Operating Range ....................... 1. 0.3V OUT = Operating Temperature Range (Note 1) ...
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... ML4870 SENSE 2 START-UP + – CONTROL SHDN A1 I L(MAX 27µH (SUMIDA CD75) ML4870 V L1 PWR GND GND V L2 100µF SHDN V OUT Figure 1. Application Test Circuit SYNCHRONOUS RECTIFIER CONTROL BOOST Q1 PWR GND 8 Figure 2 ...
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... SET case conditions to determine suitability. INDUCTOR SELECTION The ML4870 is able to operate over a wide range of inductor values. A value of 10µ good choice, but any value between 5µH and 33µH is acceptable. As the inductor value changes, the control circuitry will automatically adjust to keep the inductor current under control. Choosing an inductance value of less than 10µ ...
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... ML4870 DEISGN CONSIDERATIONS OUTPUT CAPACITOR The output capacitor filters the pulses of current from the switching regulator. Since the switching frequency will vary with inductance, the minimum output capacitance required to reduce the output ripple to an acceptable level will be a function of the inductor used. Therefore, to ...
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... V pins and from the output capacitor to the V L2 • Use a single point ground for the ML4870 PWR GND pin and the input and output capacitors, and connect the GND pin to PWR GND using a separate trace • Separate the ground for the converter circuitry from the ...
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... ORDERING INFORMATION PART NUMBER ML4870CS-3 ML4870CS-5 ML4870ES-3 (Obsolete) ML4870ES-5(Obsolete) © Micro Linear 1997 registered trademark of Micro Linear Corporation. All other trademarks are the property of their respective owners. Products described herein may be covered by one or more of the following U.S. patents: 4,897,611; 4,964,026; 5,027,116; 5,281,862; ...