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MAX8570EUT+T Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX8570EUT+T Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 11 page High-Efficiency LCD Boost with True Shutdown _______________________________________________________________________________________ 5 PIN MAX8570 (µDFN) MAX8570/ MAX8571/ MAX8574 (SOT23) MAX8572/ MAX8573/ MAX8575 (SOT23) NAME FUNCTION 31 — FB Feedback for Setting the Output Voltage. Connect FB to the center of a resistor voltage-divider from the output to GND to set positive output voltages. — — 1 OUT Output. The output voltage is preset to 15V. Connect a 1µF ceramic capacitor from OUT to GND. In shutdown, OUT is pulled to GND by an internal 7.5m Ω resistor. 2 2 2 GND Ground 13 3 SHDN Shutdown Input. A logic-low at SHDN places the part in low-power shutdown mode. Pull SHDN high or connect to VCC for normal operation. 6 4 4 LX Inductor Switching Connection 55 5 SW Isolation Switch Output. Internally connected to the drain of a p-channel MOSFET used to isolate the output from the input during shutdown. Connect a 4.7µF ceramic capacitor from SW to GND. If true shutdown is not required, SW can be left open with the input supply connected directly to the inductor. 46 6 VCC Input Voltage Supply. Connect a 2.7V to 5.5V input supply to VCC. Connect a 1µF ceramic capacitor from VCC to GND. Pin Description LOAD TRANSIENT MAX8570/71/73/74/75 toc15 100 µs/div VOUT IOUT 100mV/div (AC-COUPLED) 5mA/div 0 STARTUP AND SHUTDOWN WAVEFORMS MAX8570/71/73/74/75 toc16 400 µs/div VOUT ILX 5V/div 10V/div 200mA/div 1.8 Ω LOAD 0 0 VSHDN BOOST SOFT-START SW TURN-ON Typical Operating Characteristics (continued) (MAX8571, VCC = 3.6V, VOUT = 18V, Circuit of Figure 2, TA = +25 °C, unless otherwise noted.) |
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