rt8070 Richtek Technology Corporation, rt8070 Datasheet
rt8070
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rt8070 Summary of contents
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... Synchronous Step-Down Converter General Description The RT8070 is a high efficiency synchronous, step-down DC/DC converter. Its input voltage range is from 2.7V to 5.5V and provides an adjustable regulated output voltage from 0. while delivering output current. The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode ...
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... Functional Pin Description Pin No. SOP-8 WDFN-8L 3x3 (Exposed Pad (Exposed Pad) (Exposed Pad) www.richtek.com 2 RT8070 VIN C IN 10µ PGOOD R COMP R 1 OSC 6 COMP RT 9 (Exposed Pad) GND 0.1nF R2 (kΩ ...
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... Function Block Diagram COMP 0. Enable DS8070-03 March 2011 RT SD Slope OSC Com Output EA Clamp 10µA Hiccup Control Logic 0.7V P-G OTP 0.4V UV PGOOD ISEN OC Limit Driver NISEN N-MOSFET I LIM RT8070 VIN LX GND www.richtek.com 3 ...
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... RT8070 Absolute Maximum Ratings ------------------------------------------------------------------------------------------- −0. Supply Input Voltage Pin Switch Voltage ----------------------------------------------------------------------------------------------- −0. Other I/O Pin Voltages ---------------------------------------------------------------------------------------------- −0. Pin Switch Current ----------------------------------------------------------------------------------------------- 5A Power Dissipation 25° SOP-8 (Exposed Pad) ---------------------------------------------------------------------------------------------- 1.333W WDFN-8L 3x3 --------------------------------------------------------------------------------------------------------- 1.429W Package Thermal Resistance (Note 2) SOP-8 (Exposed Pad), θ ...
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... Note 4. The device is not guaranteed to function outside its operating conditions. DS8070-03 March 2011 Symbol Test Conditions V Rising IN V Falling IN V Rising 10nF 25° high effective thermal conductivity four-layer test board of A RT8070 Min Typ Max Unit 4 2.2 -- − 0.7 V − 0 ...
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... RT8070 Typical Operating Characteristics Efficiency vs. Output Current 100 5V 0.5 1 1.5 Output Current (A) Switching Frequency vs. Temperature 1.04 1.03 1.02 1.01 1.00 0.99 0.98 0. 330kΩ RT 0.94 -50 - Temperature (°C) V UVLO vs. Temperature IN 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 -50 - Temperature (°C) www.richtek.com 6 = 1.1V OUT OUT 2 2 ...
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... V IN (5V/Div) V OUT (1V/Div) V PGOOD (5V/Div) I OUT (5A/Div 5V 1.1V OUT Time (5ms/Div) Power Off from (5V/Div) V OUT (1V/Div) V PGOOD (5V/Div) I OUT (5A/Div 5V Time (250μs/Div) RT8070 = 1.1V OUT OUT High OUT = 1.1V OUT OUT www.richtek.com 7 ...
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... REF The resistive voltage-divider allows the FB pin to sense a fraction of the output voltage as shown in Figure RT8070 GND Figure 1. Setting the Output Voltage Soft-Start The IC contains an external soft-start clamp that gradually raises the output voltage. The soft-start timing is programmed by the external capacitor between SS pin and GND. The chip provides an internal 10μ ...
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... L MAX Under Voltage Lockout Threshold The RT8070 includes an input under voltage lockout protection (UVLO) function. If the input voltage exceeds the UVLO rising threshold voltage, the converter will reset and prepare the PWM for operation. However, if the input voltage falls below the UVLO falling threshold voltage during ⎤ ...
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... Ambient Temperature (°C) Figure 3. Derating Curves for RT8070 Package www.richtek.com 10 Layout Considerations Follow the PCB layout guidelines for optimal performance of the IC. Connect the terminal of the input capacitor(s), C close to the VIN pin as possible. This capacitor provides the AC current into the internal power MOSFETs. ...
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... SOP (Exposed Pad) Plastic Package Dimensions In Inches Min Max 0.189 0.197 0.150 0.157 0.053 0.069 0.013 0.020 0.047 0.053 0.007 0.010 0.000 0.006 0.228 0.244 0.016 0.050 0.079 0.091 0.079 0.091 0.083 0.098 0.118 0.138 RT8070 www.richtek.com 11 ...
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... RT8070 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 ...