rt9270 Richtek Technology Corporation, rt9270 Datasheet
rt9270
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rt9270 Summary of contents
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... High Performance, Low Noise Boost Converter General Description The RT9270 is a high performance, low noise, fixed frequency step up DC-DC Converter. The RT9270 converters input voltage ranging 2.3V to 5.5V into output voltage up to 14V. Current mode control with external compensation network makes it easy to stabilize the system and keep maximum flexibility ...
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... Shutdown Connect the EN to GND to turn the RT9270 off and reduce the supply current to 0.1uA. In this operation, the output voltage is the value of VIN to subtract the forward voltage of catch diode. ...
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... Widen and shorten the connected trace to minimize EMI. VIN (Pin 6) Supply Pin. Place at least a 1uF ceramic capacitor close to RT9270 for bypassing noise. FREQ (Pin 7) Frequency Select Pin. Oscillator frequency is 670kHz as FREQ connected to GND, and 1.3MHz as FREQ connected to VIN. A 5uA pull-down current is sinking on this pin ...
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... RT9270 Absolute Maximum Ratings --------------------------------------------------------------------------------------------------- −0 Supply Voltage GND --------------------------------------------------------------------------------------------------------------- − 0.3V to 16V The other pins ---------------------------------------------------------------------------------------------------------- − 0. Power Dissipation 70° MSOP-8 ----------------------------------------------------------------------------------------------------------------- 300mW Junction Temperature ------------------------------------------------------------------------------------------------- 150°C Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C Operation Temperature Range -------------------------------------------------------------------------------------- Storage Temperature Range ---------------------------------------------------------------------------------------- − 65°C to 150°C ...
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... Note 2. Devices are ESD sensitive. Handling precaution recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Note 4. Guaranteed by Design. DS9270-09 March 2007 Preliminary Symbol Test Condition R DS(ON) RT9270 Min Typ Max Units mΩ -- 250 550 -- 1 ...
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... RT9270 Typical Operating Characteristics Efficiency vs. Output Current 10uH 670kHz OSC 4.7uH 1.3MHz 80 OSC 3. 12V OUT Output Current (mA) Frequency vs. V 760 740 720 700 680 660 640 620 600 Frequency vs. Temperature 900 ...
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... No Load Supply Current vs. V 0.5 fosc = 1.3 MHz 0.45 0.4 0.35 0.3 0.25 0.2 2 2 (V) IN Maximum Output Current vs. V 1600 T = 25°C,fosc = 1.3MHz A 1400 1200 1000 V OUT 800 600 400 200 0 3 3.5 4 4.5 V (V) IN RT9270 100 ( C) ° IN fosc = 670kHz 4 12V OUT 5 5.5 6 www.richtek.com 7 ...
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... RT9270 Load-Transient Response V = 3.3V 12V IN OUT Load Current R3 = 47kΩ (200mA/Div 1000pF C4 = 22pF Output Voltage AC-Coupled (200mV/Div) Inductor Current f = 670kHz 4.7uH, C (1A/Div) OSC Time (100us/Div) Startup Waveform Without Soft-Start V = 3.3V 12V OUT EN (2V/Div) Output Voltage (5V/Div) Inductor Current (1A/Div 670kHz, NO Soft-Start Capacitor ...
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... Temperature DS9270-09 March 2007 Preliminary = 400mA OUT LX Switching Waveform = 1.9A = 1.3MHz V = 7.2V OUT V = 12V OUT ° OTP Waveform V = 3.3V 12V OUT (5V/Div) Inductor Current (1A/Div 1.3MHz 1.9A OSC LIMIT Time (4ms/Div) RT9270 = 400mA OUT www.richtek.com 9 ...
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... RT9270 Component Selection OUT OSC (V) (V) (Hz) 3.3 12 670k 10(TDK SLF6028) 3.3 12 670k 4.7(TDK SLF6028) 3.3 12 1.3M 10(TDK SLF6028) 3.3 12 1.3M 4.7(TDK SLF6028) 3.3 7.2 670k 4.7(TDK SLF6028) 3.3 7.2 1.3M 4.7(TDK SLF6028) Application Information The design procedure of Boost converter can start from the maximum input current, which is related about inductor, catch-diode, input/output and the maximum power which internal switch can stand ...
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... Place the resistor-divider as close to the IC as possible to reduce the noise sensitivity. Loop Compensation The RT9270 voltage feedback loop can be compensated with an external compensation network consisted of R3, C3 and C4 (As shown in Figure 1). Choose R3 to set the high-frequency integrator gain for fast transient response without over or under compensation ...
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... RT9270 Top Side www.richtek.com 12 Preliminary GND 6 3 VIN FREQ COMP RT9270 EVB Circuit V OUT Bottom Side DS9270-09 March 2007 ...
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... MSOP Plastic Package Richtek Technology Corporation Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com RT9270 L Dimensions In Inches Min Max 0.032 0.043 0.000 0.006 0.030 0.037 ...