MIC5238 Micrel Semiconductor, MIC5238 Datasheet
MIC5238
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MIC5238 Summary of contents
Page 1
... A bias current while the output and base drive comes off of the much lower input supply voltage Cap regulator, the MIC5238 operates with a 2.2 F ceramic capacitor on the output, offering a smaller overall solution. It also incorporates a logic-level enable pin that allows the MIC5238 to be put into a zero off-current mode when disabled ...
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... BIAS OUT SOT-23-5 (M5) Pin Description SOT-23-5 Pin Name GND BIAS 5 OUT MIC5238 EN BIAS TSOT-23-5 (D5) Pin Function Supply Input Ground Enable (Input): Logic low = shutdown; logic high = enable leave open. BiasSupply Input Regulator Output 2 Micrel GND N4xx ...
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... C to +125 .................................................. 235 C/W JA < +125 C; unless otherwise specified. J Min. Typ. Max. –1.5 +1.5 –2 +2 0.25 0.5 0.04 0 230 300 400 270 310 450 500 0. 2.5 1.5 5 0.5 350 500 5 0.2 2.0 –1.0 0.01 1.0 0.1 1.0 Micrel Units % % % % % MIC5238 ...
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... OUTPUT CURRENT (mA) Shutdown Current of V BIAS 20 No Load 0.5 1 1.5 2 ENABLE (V) MIC5238 Output Voltage vs. V BIAS 1.2 100 A 1.1 150mA 1 0.9 0.8 0.7 0.6 0.5 0.4 1.2 1.7 2.2 2.7 3.2 3.7 4.2 4.7 5.2 INPUT BIAS (V) Ground Current ( vs. Output Current 1800 OUT 1600 1400 ...
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... TEMPERATURE ( C) 5 Micrel V Ground Current BIAS vs. Temperature 40 1.1V 100 -40 - 100 120 TEMPERATURE ( C) Output Voltage vs. Temperature 1.1025 1.1V 1.1020 100 A 1.1015 1.1010 1.1005 1.1000 1.0995 1.0990 1.0985 1.0980 1.0975 -40 - 100 120 TEMPERATURE ( C) MIC5238 ...
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... MIC5238 Line Transient Response C OUT TIME (200 s/div.) EN Turn-On Characteristic TIME (40 s/div.) MIC5238 3.1V 2.1V 1.1V Output = 4.7 F ceramic 6 Micrel Load Transient Response 1.1V output C = 4.7 F ceramic OUT 150mA 1mA TIME (400 s/div.) Load Transient Response 150mA 0mA OUT C = 4.7 F ceramic OUT TIME (400 s/div.) ...
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... MIC5238 Functional Diagram IN BIAS EN August 2003 ENABLE V REF GND Block Diagram – Fixed Output Voltage 7 Micrel OUT MIC5238 ...
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... Y5V dielectric, the value must be much higher than a X7R ceramic capacitor to ensure the same minimum capaci- tance over the equivalent operating temperature range. No-Load Stability The MIC5238 will remain stable and in regulation with no load unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Thermal Considerations The MIC5238 is designed to provide 150mA of continuous current in a very small package ...
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... Output power = 1V IN BIAS Efficiency = 150/225 (0.0002+0.002) = Therefore, by using the dual supply MIC5238 LDO the efficiency is nearly doubled over the single supply version. This is a valuable asset in portable power management applications equating to longer battery life and less heat being generated in the application. ...
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... A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify MIC5238 1.75 (0.069) 3 ...