RT8258 RICHTEK [Richtek Technology Corporation], RT8258 Datasheet
RT8258
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RT8258 Summary of contents
Page 1
... Step-Down Converter General Description The RT8258 is a high voltage buck converter that can support the input voltage range from 4.5V to 24V and the output current can 1.2A. Current Mode operation provides fast transient response and eases loop stabilization. The chip also provides protection functions such as cycle- by-cycle current limiting and thermal shutdown protection ...
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... R1 (kΩ) 200 100 R2 (kΩ) 3.6 3.6 L (μ (μF) OUT Note : The value related to the loop bandwidth of the RT8258 strongly recommended to follow the parameters in above table for the specific output voltage. Function Block Diagram VIN 1µA 1.1V 10k + EN Shutdown 3V Comparator ...
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... PHASE − 4.8V LIM BOOT PHASE Rising SHDN 2V (No Switching RT8258 + 0.3V PHASE − 40°C to 125°C − 40°C to 85°C Min Typ Max Unit 0.784 0.8 0.816 V μA -- 0.1 0.3 Ω -- 0.3 -- μ 1.6 2 ...
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... RT8258 Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. θ ...
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... IN 3.300 3.278 3.256 3.234 -50 - Temperature (°C) Quiescent Current vs. Temperature 600 575 550 525 500 475 450 425 400 -50 - Temperature (°C) RT8258 V = 12V 24V 3.3V OUT 0 OUT 75 100 125 V = 24V 12V 2V ...
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... RT8258 Power On from (2V/Div) V OUT (1V/Div 12V Time (100μs/Div) Output Ripple Voltage V OUT (10mV/Div) V PHASE (10V/Div (1A/Div 12V Time (500ns/Div) Load Transient Response V OUT (0.1V/Div) I OUT (0.5A/Div 12V OUT Time (50μs/Div) www.richtek.com 6 = 3.3V 1.2A ...
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... Application Information The RT8258 is an asynchronous high voltage buck converter that can support the input voltage range from 4.5V to 24V and the output current can 1.2A. Output Voltage Setting The resistive voltage divider allows the FB pin to sense a fraction of the output voltage as shown in Figure 1. ...
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... RT8258 Do not allow the core to saturate! Different core materials and shapes will change the size/ current and price/current relationship of an inductor. Toroid or shielded pot cores in ferrite or permalloy materials are small and do not radiate energy. However, they are usually more expensive than the similar powdered iron inductors ...
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... P D(MAX) T/SOT-23-6 package The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) θ . For RT8258 package, the Figure 3 of derating curve JA allows the designer to see the effect of rising ambient temperature on the maximum power dissipation allowed. 0.50 0.45 0.40 0.35 ...
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... RT8258 Table 2. Suggested Inductors for L Component Supplier Series SLF12555T TDK NR8040 TAIYO YUDEN SLF12565T TDK Table 3. Suggested Capacitors for C Location Component Supplier C MURATA IN C TDK IN C TAIYO YUDEN IN C MURATA OUT C TDK OUT C TAIYO YUDEN OUT Table 4. Suggested Diode for D1 Component Supplier ...
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... SOT-23-6 Surface Mount Package RT8258 H L Dimensions In Inches Min Max 0.031 0.051 0.000 0.006 0.055 0.071 0.010 0.022 0.102 0.118 0.106 0.122 0.033 ...
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... RT8258 Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time ...