rt8288 Richtek Technology Corporation, rt8288 Datasheet
rt8288
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rt8288 Summary of contents
Page 1
... Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. An internal soft-start minimizes external parts count and internal compensation circuitry. The RT8288 requires a minimal number of readily available external components, providing a compact solution. Ordering Information RT8288 Package Type ...
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... Function Pin Description Pin No. Pin Name 1 VIN BOOT VCC 8, GND 9 (Exposed Pad) www.richtek.com BOOT VIN C IN RT8288 22µ VCC GND Table 1. Recommended Components Selection R2 (kΩ 14.46 75 24.32 75 35.82 5 4.07 5 5.84 5 10.31 5 16.69 Supply Input. VIN supplies the power to the IC, as well as the step-down converter switches ...
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... Function Block Diagram VIN 1. 1µA 3V 1.7V VCC FB DS8288-01 August 2011 Shutdown Comparator Ramp Generator + Regulator - - Oscillator + 500kHz Lockout Comparator Error Reference Amplifier + - 30pF 400k 1pF RT8288 Current Sense Amplifier - + S Q Driver + R - PWM Comparator www.richtek.com BOOT SW GND 3 ...
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... RT8288 Absolute Maximum Ratings ---------------------------------------------------------------------------------- −0.3V to 26V Supply Input Voltage Switch Voltage, SW ----------------------------------------------------------------------------------------- −0. Boot Voltage, BOOT ---------------------------------------------------------------------------------------- (SW − 0.3V) to (SW + 6V) All Other Pins ------------------------------------------------------------------------------------------------- −0. Power Dissipation 25° SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------- 1.333W Package Thermal Resistance (Note 2) SOP-8 (Exposed Pad), θ ...
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... Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. DS8288-01 August 2011 Symbol Test Conditions ΔV UVLO I = 5mA 25° high-effective thermal conductivity four-layer test board of JEDEC A RT8288 Min Typ Max -- 400 -- -- ...
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... RT8288 Typical Operating Characteristics Efficiency vs. Output Current 100 0.5 1 Output Current (A) Reference Voltage vs. Temperature 0.84 0.83 0.82 0.81 0.80 0.79 0.78 0.77 0.76 -50 - Temperature (°C) Switching Frequency vs. Input Voltage 550 525 500 475 450 425 400 375 350 Input Voltage (V) www.richtek.com ...
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... Temperature (°C) Load Transient Response V OUT I OUT (2A/Div 12V OUT Time (100μs/Div) Output Voltage Ripple V OUT V LX (10V/Div (2A/Div) Time (1μs/Div) RT8288 V = 12V 1.22V IN OUT 50 75 100 125 = 1.22V OUT V = 12V OUT www.richtek.com 7 ...
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... RT8288 Power On from (10V/Div) V OUT (1V/Div (5A/Div 12V Time (5ms/Div) Power On from (5V/Div (5A/Div (10V/Div) V OUT (1V/Div 12V Time (2.5ms/Div) www.richtek.com (10V/Div) V (1V/Div) (5A/Div) = 1.22V OUT OUT V (5V/Div) (5A/Div) V (10V/Div) V (1V/Div) = 1.22V, I ...
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... Finally, the internal 1V reference pin is the chip enable input. Pulling the EN pin * capacitor from the VIN pin, as can be seen from connected between target value, a resistive voltage divider can be placed RT8288 * resistor smaller than the can be selected EN2 www.richtek.com 9 ...
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... IN 100k VCC GND 1 VIN BOOT C RT8288 VCC C GND C ripple current stays below a specified maximum, the inductor value should be chosen according to the following equation : , the UVP function will The inductor's current rating (caused a 40°C temperature rising from 25° ...
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... This simple worst case condition is commonly capacitors may also be paralleled to and C IN OUT Capacitance (μ between SW and GND and locating but this method will BOOT RT8288 , where I = OUT RMS Case Size 1210 1210 1206 1210 1210 1210 www.richtek.com 11 ...
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... T is the maximum junction temperature, T J(MAX) the ambient temperature, and θ JA thermal resistance. For recommended operating condition specifications of the RT8288, the maximum junction temperature is 125°C and T is the ambient temperature. The junction to ambient A thermal resistance, θ layout dependent. For SOP-8 JA (Exposed Pad) package, the thermal resistance, θ ...
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... Place the input and output capacitors as close to the IC as possible. GND C IN VIN GND VCC GND BOOT BOOT L C OUT V GND OUT Figure 7. PCB Layout Guide RT8288 R2 Place the feedback close to the IC as possible OUT www.richtek.com 13 ...
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... RT8288 Outline Dimension EXPOSED THERMAL PAD (Bottom of Package) Symbol Option 1 Option 2 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 ...