ame5258 AME, Inc., ame5258 Datasheet
ame5258
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ame5258 Summary of contents
Page 1
... At very light load, the AME5258 will automatically skip pulses in pulse skip mode operation to maintain output regulation. The AME5258 is simple to use. As with standard LDO's,Input and output capacitor are required. The only other element is a small, low cost, 2.2 H inductor.Low output voltages are easily supported with the 0.6V feed- back reference voltage ...
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... AME AME5258 n Function Diagram 0. 0.55V - UVDET + + OVDET 0.65V - EN 0.6V VREF 1 2 Synchronous Buck Converter Slope COMP - ICOMP SWITCHING LOGIC AND BLANKING CIRCUIT OSC Figure 3: Founction Block Diagram 1.5MHz, 600mA IN + IRCMP GND Rev.A.05 ...
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... Feedback Pin Receives the feedback voltage from an external resistive divider across the output. OUT Output Voltage for fixed version 1.5MHz, 600mA Synchronous Buck Converter SOT-25 ( Adjustable Output ) Top View AME5258-BEVADJ GND AME5258 Die Attach: ...
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... AME AME5258 n Ordering Information AME5258 - xxx Pin Configuration GND (SOT-25 OUT GND (SOT-25 Synchronous Buck Converter Output Voltage Number of Pins Package Type Pin Configuration Package Number of Type Pins E: SOT- SOT- ...
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... Marking* AME5258-BEVADJ BWMMXX AME5258-AEV120 BYRMXX AME5258-AEV180 AME5258-AEV250 BYNMXX AME5258-AEV330 Note: 1. The first 3 places represent product code assigned by AME such as BWM bar on top of first letter represents Green Part such as BWM. 3. The last 3 places MXX represent Marking Code. It contains M as date code in "month" code and that is for AME internal use only ...
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... AME AME5258 n Recommended Operating Conditions Parameter Ambient Temperature Range Junction Temperature Range Storage Temperature Range n Thermal Information Parameter Thermal Resistance* (Junction to Case) Thermal Resistance (Junction to Ambient) Internal Power Dissipation Solder Iron (10 Sec)** * Measure on center of molding compound if IC has no tab MIL-STD-202G 210F ...
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... OUT V =1.8V, OUT I =100mA OUT V =2.5V, OUT AME5258-AEVxxx I =100mA OUT V =3.3V, OUT I =100mA OUT V =2. =3V, V =0. AME5258-BEVADJ Duty Cycle < 35% V =3V, V =90 OUT AME5258-AEVxxx Duty Cycle < 35% V =0V, V =4. =0. =90% FB OUT V =V =4. =2.5V & I =100mA I N OUT ...
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... MOSFET and the inductor. An important detail to remem- ber is that at low input supply voltages, the RDS(ON) of the P-channel switch increases (see Typical Performance Characteristics). Therefore, the user should calculate the power dissipation when the AME5258 is used at 100% duty cycle with low input Voltage. n Application Information Inductor Selection For most applications, the value of the inductor will fall in the range ...
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... AME AME5258 Inductor Core Selection Once the value for L is known, the type of inductor must be selected. High efficiency converters generally cannot afford the core loss found in low cost powdered iron cores, forcing the use of more expensive ferrite or mollypermalloy cores. Actual core loss is independent of core size for a fixed inductor value but it is very depen- dent on the inductance selected ...
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... In most applications the AME5258 does not dissipate much heat due to its high efficiency. But, in applications where the AME5258 is running at high ambient tempera- ture with low supply voltage and high duty cycles, such as in dropout, the heat dissipated may exceed the maxi- mum junction temperature of the part ...
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... When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the AME5258. These items are also illustrated graphically in Figures 10 and Figures 11 . Check the following in your layout: 1. The power traces, consisting of the GND trace, the SW trace and the V 2 ...
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... AME AME5258 Start-UP form Shutdown V =3.6V 200 S/Div IN V =1.8V OUT I =600mA LOAD Pluse Skipping Mode 1 S/Div V =3. =1.8V OUT I =10mA OUT Load Step 20 S/Div V =3. =1.8V OUT I =0mA to 600mA LOAD 12 Synchronous Buck Converter Pluse Skipping Mode RUN 2V /Div V OUT 1V/Div I L 500mA/Div V =3. =1.8V OUT ...
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... AME AME5258 Oscillator Frequency VS Temperature 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 -50 -25 0 +25 +50 Temperature Temperature FB 0.615 0.612 0.609 0.606 0.603 0.600 0.597 0.594 0.591 0.588 0.585 -50 -25 0 +25 +50 Temperature Temperature DS(ON) 0.80 0.75 V =2.7V IN 0.70 V =3.6V IN 0.65 V =4.2V IN 0.60 0.55 0.50 0.45 0.40 0.35 0.30 0.25 0.20 -50 -25 0 +25 +50 Temperature( Rev.A.05 +75 +100 +125 o C) +75 +100 +125 o C) Main Switch ...
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... AME AME5258 Efficiency vs Load Current 100 90 V =2. =3. =4. (mA) OUT Efficiency vs Load Current 100 =4. (mA) OUT Current Limit vs Input Voltage 1800 1700 1600 1500 1400 ...
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... AME AME5258 n Date Code Rule Month Code 1: January 7: July 2: February 8: August 3: March 9: September 4: April A: October 5: May B: November 6: June C: December n Tape and Reel Dimension SOT-25 PIN 1 Carrier Tape, Number of Components Per Reel and Reel Size Package Carrier Width (W) SOT-25 8.0±0.1 mm Rev.A.05 Synchronous Buck Converter ...
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... AME AME5258 n Package Dimension SOT-25 Top View D S1 PIN 1 e Front View b 16 Synchronous Buck Converter Side View SYMBOLS θ 1.5MHz, 600mA MILLIMETERS INCHES MIN MAX MIN MAX 0.90 1.30 0.0354 0.0512 0.00 0.15 0.0000 0.0059 0.30 0.55 0.0118 0.0217 2.70 3.10 0.1063 ...
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... These products of AME, Inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. ...