rt9275 Richtek Technology Corporation, rt9275 Datasheet
rt9275
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rt9275 Summary of contents
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... Tiny Package, High Efficiency, Step-Up DC/DC Converter General Description The RT9275 is a compact, high efficiency, and low voltage step-up DC/DC converter with an Adaptive Current Mode PWM control loop, includes an error amplifier, ramp generator, comparator, switch pass element and driver in which providing a stable and high efficient operation over a wide range of load currents ...
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... Chip Enable (Active High) 2 EXT Output pin for driving external NMOS 3 GND Ground 4 LX Pin for switching 5 VDD Input positive power pin of RT9275 Feedback input pin. Internal reference 6 FB voltage for the error amplifier is 1.25V. Function Block Diagram VDD FB EN www.richtek.com 2 Preliminary L1 4 ...
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... LINE DD Δ 2.5V, I LOAD 3.3V DD Min Typ -- 0 160 = 3.3V OUT 0.2 0.3 = GND 0.01 = 4.5V IN 1.225 1. 300 400 0 0.3 1.5 2 1.5 = 1mA 100mA L 6.3 6.8 0.4 0.8 RT9275 0.4W Max Units 1 μA 200 0.5 mA μA 75 μA 1 1.275 V -- ppm/°C 500 kHz %/° Ω 1.1 2.5 A Ω 5 8.5 Ω 5 8.5 10 mV/V -- mV/mA 7 continued www.richtek.com 3 ...
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... RT9275 Parameter Soft Start time Under Voltage Protection – Threshold Voltage Thermal Shutdown Thermal Shutdown Hysterises 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 ...
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... Efficiency vs. Output Current 3.3V 25°C OUT Output Current (mA) Output Voltage vs. Output Current 3.32 3.31 3 2. 1. 1. 3.3V OUT 3. Output Current (mA) RT9275 1.0V IN 100 1000 100 1000 www.richtek.com 5 ...
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... RT9275 Output Voltage vs. Output Current 4.98 4.97 4.96 4. 4. 5.0V V OUT 4 Output Current (mA) LX & Output Ripple -10 Time (1μs/Div) LX & Output Ripple V = 1.5V -10 Time (1μs/Div) www.richtek.com 6 Preliminary = 1.5V IN 100 1000 = 3 ...
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... Time (1μs/Div) LX & Output Ripple 3V -10 Time (1μs/Div) DS9275-06 March 2007 Preliminary = 3.3V @ 100mA OUT = 3.3V @ 100mA OUT = 3.3V @ 100mA OUT RT9275 LX & Output Ripple V = 2.5V OUT -10 Time (1μs/Div) LX & Output Ripple 3V OUT 4 2 ...
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... RT9275 LX & Output Ripple - 1.5V Time (1μs/Div) LX & Output Ripple - Time (1μs/Div) LX & Output Ripple 2.5V -10 Time (1μs/Div) www.richtek.com 8 Preliminary = 5V @ 100mA OUT = 2V 150mA OUT = 5V @ 200mA OUT LX & ...
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... LX & Output Ripple -10 Time (1μs/Div) DS9275-06 March 2007 Preliminary = 3V 250mA OUT = 5V @ 250mA OUT = 4V 250mA OUT RT9275 LX & Output Ripple - 3.5V OUT Time (5μs/Div) LX & Output Ripple -10 ...
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... RT9275 LX & Output Ripple - 4.5V Time (1μs/Div) Load Transient Respones 50 0 -50 100 1.5V 3.3V OUT Time (100μs/Div) Load Transient Respones V = 2.5V 3.3V OUT 50 0 -50 100 50 0 Time (100μs/Div) www.richtek.com 10 Preliminary = 5V @ 250mA ...
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... Time (100μs/Div) DS9275-06 March 2007 Preliminary = 5V 10mA to 50mA OUT = 5V 10mA to 100mA OUT = 5V 10mA to 100mA OUT RT9275 Load Transient Respones OUT OUT 50 0 -50 100 50 0 Time (100μs/Div) Load Transient Respones ...
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... RT9275 Load Transient Respones V = 4.5V OUT 50 0 -50 100 50 0 Time (100μs/Div) www.richtek.com 12 Preliminary = 5V 10mA to 100mA OUT DS9275-06 March 2007 ...
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... Typical Application Circuit for the board) V OUT R1 FB Pin R2 ” are sensitive to any − to GND noise bypass Short and wide connection DD − to GND noise bypass Add a capacitor close not an idea voltage source Top Layer - - Bottom Layer - RT9275 www.richtek.com 13 ...
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... RT9275 Outline Dimension Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 www.richtek.com 14 Preliminary Dimensions In Millimeters Min Max 0.889 1.295 0.000 0.152 1.397 1.803 0.250 0.560 2.591 2 ...